/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSimulator Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics; //for [DebuggerNonUserCode]
using System.Runtime.Remoting.Lifetime;
using System.Text;
using System.Threading;
using System.Text.RegularExpressions;
using Nini.Config;
using log4net;
using OpenMetaverse;
using OpenMetaverse.Packets;
using OpenSim;
using OpenSim.Framework;
using OpenSim.Framework.Communications.Cache;
using OpenSim.Region.CoreModules;
using OpenSim.Region.CoreModules.World.Land;
using OpenSim.Region.CoreModules.World.Terrain;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
using OpenSim.Region.Framework.Scenes.Animation;
using OpenSim.Region.Physics.Manager;
using OpenSim.Region.ScriptEngine.Shared;
using OpenSim.Region.ScriptEngine.Shared.Api.Plugins;
using OpenSim.Region.ScriptEngine.Shared.ScriptBase;
using OpenSim.Region.ScriptEngine.Interfaces;
using OpenSim.Region.ScriptEngine.Shared.Api.Interfaces;
using OpenSim.Services.Interfaces;

using PrimType = OpenSim.Region.Framework.Scenes.PrimType;
using GridRegion = OpenSim.Services.Interfaces.GridRegion;
using AssetLandmark = OpenSim.Framework.AssetLandmark;

using LSL_Float = OpenSim.Region.ScriptEngine.Shared.LSL_Types.LSLFloat;
using LSL_Integer = OpenSim.Region.ScriptEngine.Shared.LSL_Types.LSLInteger;
using LSL_Key = OpenSim.Region.ScriptEngine.Shared.LSL_Types.LSLString;
using LSL_List = OpenSim.Region.ScriptEngine.Shared.LSL_Types.list;
using LSL_Rotation = OpenSim.Region.ScriptEngine.Shared.LSL_Types.Quaternion;
using LSL_String = OpenSim.Region.ScriptEngine.Shared.LSL_Types.LSLString;
using LSL_Vector = OpenSim.Region.ScriptEngine.Shared.LSL_Types.Vector3;
using System.Reflection;

namespace OpenSim.Region.ScriptEngine.Shared.Api
{
    /// <summary>
    /// Contains all LSL ll-functions. This class will be in Default AppDomain.
    /// </summary>
    public class LSL_Api : MarshalByRefObject, ILSL_Api, IScriptApi
    {
        //private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        protected IScriptEngine m_ScriptEngine;
        protected SceneObjectPart m_host;
        protected uint m_localID;
        protected UUID m_itemID;
        protected bool throwErrorOnNotImplemented = true;
        protected AsyncCommandManager AsyncCommands = null;
        protected float m_ScriptDelayFactor = 1.0f;
        protected float m_ScriptDistanceFactor = 1.0f;
        protected float m_MinTimerInterval = 0.5f;

        protected DateTime m_timer = DateTime.Now;
        protected bool m_waitingForScriptAnswer = false;
        protected bool m_automaticLinkPermission = false;
        protected IMessageTransferModule m_TransferModule = null;
        protected int m_notecardLineReadCharsMax = 255;
        protected int m_scriptConsoleChannel = 0;
        protected bool m_scriptConsoleChannelEnabled = false;
        protected IUrlModule m_UrlModule = null;

        public void Initialize(IScriptEngine ScriptEngine, SceneObjectPart host, uint localID, UUID itemID)
        {
            m_ScriptEngine = ScriptEngine;
            m_host = host;
            m_localID = localID;
            m_itemID = itemID;

            m_ScriptDelayFactor =
                m_ScriptEngine.Config.GetFloat("ScriptDelayFactor", 1.0f);
            m_ScriptDistanceFactor =
                m_ScriptEngine.Config.GetFloat("ScriptDistanceLimitFactor", 1.0f);
            m_MinTimerInterval =
                m_ScriptEngine.Config.GetFloat("MinTimerInterval", 0.5f);
            m_automaticLinkPermission =
                m_ScriptEngine.Config.GetBoolean("AutomaticLinkPermission", false);
            m_notecardLineReadCharsMax =
                m_ScriptEngine.Config.GetInt("NotecardLineReadCharsMax", 255);
            if (m_notecardLineReadCharsMax > 65535)
                m_notecardLineReadCharsMax = 65535;

            m_TransferModule =
                    m_ScriptEngine.World.RequestModuleInterface<IMessageTransferModule>();
            m_UrlModule = m_ScriptEngine.World.RequestModuleInterface<IUrlModule>();
            if (m_UrlModule != null)
            {
                m_ScriptEngine.OnScriptRemoved += m_UrlModule.ScriptRemoved;
                m_ScriptEngine.OnObjectRemoved += m_UrlModule.ObjectRemoved;
            }

            AsyncCommands = new AsyncCommandManager(ScriptEngine);
        }

        public override Object InitializeLifetimeService()
        {
            ILease lease = (ILease)base.InitializeLifetimeService();

            if (lease.CurrentState == LeaseState.Initial)
            {
                lease.InitialLeaseTime = TimeSpan.FromMinutes(0);
//                lease.RenewOnCallTime = TimeSpan.FromSeconds(10.0);
//                lease.SponsorshipTimeout = TimeSpan.FromMinutes(1.0);
            }
            return lease;
        }

        protected virtual void ScriptSleep(int delay)
        {
            delay = (int)((float)delay * m_ScriptDelayFactor);
            if (delay == 0)
                return;
            System.Threading.Thread.Sleep(delay);
        }

        public Scene World
        {
            get { return m_ScriptEngine.World; }
        }

        [DebuggerNonUserCode]
        public void state(string newState)
        {
            m_ScriptEngine.SetState(m_itemID, newState);
        }

        /// <summary>
        /// Reset the named script. The script must be present
        /// in the same prim.
        /// </summary>
        [DebuggerNonUserCode]
        public void llResetScript()
        {
            m_host.AddScriptLPS(1);
            m_ScriptEngine.ApiResetScript(m_itemID);
        }

        public void llResetOtherScript(string name)
        {
            UUID item;

            m_host.AddScriptLPS(1);

            if ((item = ScriptByName(name)) != UUID.Zero)
                m_ScriptEngine.ResetScript(item);
            else
                ShoutError("llResetOtherScript: script "+name+" not found");
        }

        public LSL_Integer llGetScriptState(string name)
        {
            UUID item;

            m_host.AddScriptLPS(1);

            if ((item = ScriptByName(name)) != UUID.Zero)
            {
                return m_ScriptEngine.GetScriptState(item) ?1:0;
            }

            ShoutError("llGetScriptState: script "+name+" not found");

            // If we didn't find it, then it's safe to
            // assume it is not running.

            return 0;
        }

        public void llSetScriptState(string name, int run)
        {
            UUID item;

            m_host.AddScriptLPS(1);

            // These functions are supposed to be robust,
            // so get the state one step at a time.

            if ((item = ScriptByName(name)) != UUID.Zero)
            {
                m_ScriptEngine.SetScriptState(item, run == 0 ? false : true);
            }
            else
            {
                ShoutError("llSetScriptState: script "+name+" not found");
            }
        }

        public List<SceneObjectPart> GetLinkParts(int linkType)
        {
            List<SceneObjectPart> ret = new List<SceneObjectPart>();
            if (m_host == null || m_host.ParentGroup == null || m_host.ParentGroup.IsDeleted)
                return ret;
            ret.Add(m_host);

            switch (linkType)
            {
            case ScriptBaseClass.LINK_SET:
                if (m_host.ParentGroup != null)
                    return new List<SceneObjectPart>(m_host.ParentGroup.Children.Values);
                return ret;

            case ScriptBaseClass.LINK_ROOT:
                if (m_host.ParentGroup != null)
                {
                    ret = new List<SceneObjectPart>();
                    ret.Add(m_host.ParentGroup.RootPart);
                    return ret;
                }
                return ret;

            case ScriptBaseClass.LINK_ALL_OTHERS:
                if (m_host.ParentGroup ==  null)
                    return new List<SceneObjectPart>();
                ret = new List<SceneObjectPart>(m_host.ParentGroup.Children.Values);
                if (ret.Contains(m_host))
                    ret.Remove(m_host);
                return ret;

            case ScriptBaseClass.LINK_ALL_CHILDREN:
                if (m_host.ParentGroup ==  null)
                    return new List<SceneObjectPart>();
                ret = new List<SceneObjectPart>(m_host.ParentGroup.Children.Values);
                if (ret.Contains(m_host.ParentGroup.RootPart))
                    ret.Remove(m_host.ParentGroup.RootPart);
                return ret;

            case ScriptBaseClass.LINK_THIS:
                return ret;

            default:
                if (linkType < 0 || m_host.ParentGroup ==  null)
                    return new List<SceneObjectPart>();
                SceneObjectPart target = m_host.ParentGroup.GetLinkNumPart(linkType);
                if (target == null)
                    return new List<SceneObjectPart>();
                ret = new List<SceneObjectPart>();
                ret.Add(target);
                return ret;

            }
        }

        protected UUID InventorySelf()
        {
            UUID invItemID = new UUID();
            bool unlock = false;
            if (!m_host.TaskInventory.IsReadLockedByMe())
            {
                m_host.TaskInventory.LockItemsForRead(true);
                unlock = true;
            }
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Type == 10 && inv.Value.ItemID == m_itemID)
                {
                    invItemID = inv.Key;
                    break;
                }
            }
            if (unlock)
            {
                m_host.TaskInventory.LockItemsForRead(false);
            }
            return invItemID;
        }

        protected UUID InventoryKey(string name, int type)
        {
            m_host.AddScriptLPS(1);
            m_host.TaskInventory.LockItemsForRead(true);
            
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Name == name)
                {
                    m_host.TaskInventory.LockItemsForRead(false);
                    
                    if (inv.Value.Type != type)
                    {
                        return UUID.Zero;
                    }

                    return inv.Value.AssetID;
                }
            }

            m_host.TaskInventory.LockItemsForRead(false);
            return UUID.Zero;
        }

        protected UUID InventoryKey(string name)
        {
            m_host.AddScriptLPS(1);

            
            m_host.TaskInventory.LockItemsForRead(true);

            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Name == name)
                {
                    m_host.TaskInventory.LockItemsForRead(false);
                    return inv.Value.AssetID;
                }
            }

            m_host.TaskInventory.LockItemsForRead(false);


            return UUID.Zero;
        }


        /// <summary>
        /// accepts a valid UUID, -or- a name of an inventory item.
        /// Returns a valid UUID or UUID.Zero if key invalid and item not found
        /// in prim inventory.
        /// </summary>
        /// <param name="k"></param>
        /// <returns></returns>
        protected UUID KeyOrName(string k)
        {
            UUID key = UUID.Zero;

            // if we can parse the string as a key, use it.
            if (UUID.TryParse(k, out key))
            {
                return key;
            }
            // else try to locate the name in inventory of object. found returns key,
            // not found returns UUID.Zero which will translate to the default particle texture
            else
            {
                return InventoryKey(k);
            }
        }

        // convert a LSL_Rotation to a Quaternion
        protected Quaternion Rot2Quaternion(LSL_Rotation r)
        {
            Quaternion q = new Quaternion((float)r.x, (float)r.y, (float)r.z, (float)r.s);
            q.Normalize();
            return q;
        }

        //These are the implementations of the various ll-functions used by the LSL scripts.
        public LSL_Float llSin(double f)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Sin(f);
        }

        public LSL_Float llCos(double f)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Cos(f);
        }

        public LSL_Float llTan(double f)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Tan(f);
        }

        public LSL_Float llAtan2(double x, double y)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Atan2(x, y);
        }

        public LSL_Float llSqrt(double f)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Sqrt(f);
        }

        public LSL_Float llPow(double fbase, double fexponent)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Pow(fbase, fexponent);
        }

        public LSL_Integer llAbs(int i)
        {
            // changed to replicate LSL behaviour whereby minimum int value is returned untouched.
            m_host.AddScriptLPS(1);
            if (i == Int32.MinValue)
                return i;
            else
                return (int)Math.Abs(i);
        }

        public LSL_Float llFabs(double f)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Abs(f);
        }

        public LSL_Float llFrand(double mag)
        {
            m_host.AddScriptLPS(1);
            lock (Util.RandomClass)
            {
                return Util.RandomClass.NextDouble() * mag;
            }
        }

        public LSL_Integer llFloor(double f)
        {
            m_host.AddScriptLPS(1);
            return (int)Math.Floor(f);
        }

        public LSL_Integer llCeil(double f)
        {
            m_host.AddScriptLPS(1);
            return (int)Math.Ceiling(f);
        }

        // Xantor 01/May/2008 fixed midpointrounding (2.5 becomes 3.0 instead of 2.0, default = ToEven)
        public LSL_Integer llRound(double f)
        {
            m_host.AddScriptLPS(1);
            return (int)Math.Round(f, MidpointRounding.AwayFromZero);
        }

        //This next group are vector operations involving squaring and square root. ckrinke
        public LSL_Float llVecMag(LSL_Vector v)
        {
            m_host.AddScriptLPS(1);
            return LSL_Vector.Mag(v);
        }

        public LSL_Vector llVecNorm(LSL_Vector v)
        {
            m_host.AddScriptLPS(1);
            double mag = LSL_Vector.Mag(v);
            LSL_Vector nor = new LSL_Vector();
            nor.x = v.x / mag;
            nor.y = v.y / mag;
            nor.z = v.z / mag;
            return nor;
        }

        public LSL_Float llVecDist(LSL_Vector a, LSL_Vector b)
        {
            m_host.AddScriptLPS(1);
            double dx = a.x - b.x;
            double dy = a.y - b.y;
            double dz = a.z - b.z;
            return Math.Sqrt(dx * dx + dy * dy + dz * dz);
        }

        //Now we start getting into quaternions which means sin/cos, matrices and vectors. ckrinke

        // Utility function for llRot2Euler

        // normalize an angle between -PI and PI (-180 to +180 degrees)
        protected double NormalizeAngle(double angle)
        {
            if (angle > -Math.PI && angle < Math.PI)
                return angle;

            int numPis = (int)(Math.PI / angle);
            double remainder = angle - Math.PI * numPis;
            if (numPis % 2 == 1)
                return Math.PI - angle;
            return remainder;
        }

        // Old implementation of llRot2Euler, now normalized

        public LSL_Vector llRot2Euler(LSL_Rotation r)
        {
            m_host.AddScriptLPS(1);
            //This implementation is from http://lslwiki.net/lslwiki/wakka.php?wakka=LibraryRotationFunctions. ckrinke
            LSL_Rotation t = new LSL_Rotation(r.x * r.x, r.y * r.y, r.z * r.z, r.s * r.s);
            double m = (t.x + t.y + t.z + t.s);
            if (m == 0) return new LSL_Vector();
            double n = 2 * (r.y * r.s + r.x * r.z);
            double p = m * m - n * n;
            if (p > 0)
                return new LSL_Vector(NormalizeAngle(Math.Atan2(2.0 * (r.x * r.s - r.y * r.z), (-t.x - t.y + t.z + t.s))),
                                             NormalizeAngle(Math.Atan2(n, Math.Sqrt(p))),
                                             NormalizeAngle(Math.Atan2(2.0 * (r.z * r.s - r.x * r.y), (t.x - t.y - t.z + t.s))));
            else if (n > 0)
                return new LSL_Vector(0.0, Math.PI * 0.5, NormalizeAngle(Math.Atan2((r.z * r.s + r.x * r.y), 0.5 - t.x - t.z)));
            else
                return new LSL_Vector(0.0, -Math.PI * 0.5, NormalizeAngle(Math.Atan2((r.z * r.s + r.x * r.y), 0.5 - t.x - t.z)));
        }

        /* From wiki:
        The Euler angle vector (in radians) is converted to a rotation by doing the rotations around the 3 axes
        in Z, Y, X order. So llEuler2Rot(<1.0, 2.0, 3.0> * DEG_TO_RAD) generates a rotation by taking the zero rotation,
        a vector pointing along the X axis, first rotating it 3 degrees around the global Z axis, then rotating the resulting
        vector 2 degrees around the global Y axis, and finally rotating that 1 degree around the global X axis.
        */

        /* How we arrived at this llEuler2Rot
         *
         * Experiment in SL to determine conventions:
         *   llEuler2Rot(<PI,0,0>)=<1,0,0,0>
         *   llEuler2Rot(<0,PI,0>)=<0,1,0,0>
         *   llEuler2Rot(<0,0,PI>)=<0,0,1,0>
         *
         * Important facts about Quaternions
         *  - multiplication is non-commutative (a*b != b*a)
         *  - http://en.wikipedia.org/wiki/Quaternion#Basis_multiplication
         *
         * Above SL experiment gives (c1,c2,c3,s1,s2,s3 as defined in our llEuler2Rot):
         *   Qx = c1+i*s1
         *   Qy = c2+j*s2;
         *   Qz = c3+k*s3;
         *
         * Rotations applied in order (from above) Z, Y, X
         * Q = (Qz * Qy) * Qx
         * ((c1+i*s1)*(c2+j*s2))*(c3+k*s3)
         * (c1*c2+i*s1*c2+j*c1*s2+ij*s1*s2)*(c3+k*s3)
         * (c1*c2+i*s1*c2+j*c1*s2+k*s1*s2)*(c3+k*s3)
         * c1*c2*c3+i*s1*c2*c3+j*c1*s2*c3+k*s1*s2*c3+k*c1*c2*s3+ik*s1*c2*s3+jk*c1*s2*s3+kk*s1*s2*s3
         * c1*c2*c3+i*s1*c2*c3+j*c1*s2*c3+k*s1*s2*c3+k*c1*c2*s3 -j*s1*c2*s3 +i*c1*s2*s3   -s1*s2*s3
         * regroup: x=i*(s1*c2*c3+c1*s2*s3)
         *          y=j*(c1*s2*c3-s1*c2*s3)
         *          z=k*(s1*s2*c3+c1*c2*s3)
         *          s=   c1*c2*c3-s1*s2*s3
         *
         * This implementation agrees with the functions found here:
         * http://lslwiki.net/lslwiki/wakka.php?wakka=LibraryRotationFunctions
         * And with the results in SL.
         *
         * It's also possible to calculate llEuler2Rot by direct multiplication of
         * the Qz, Qy, and Qx vectors (as above - and done in the "accurate" function
         * from the wiki).
         * Apparently in some cases this is better from a numerical precision perspective?
         */

        public LSL_Rotation llEuler2Rot(LSL_Vector v)
        {
            m_host.AddScriptLPS(1);

            double x,y,z,s;

            double c1 = Math.Cos(v.x * 0.5);
            double c2 = Math.Cos(v.y * 0.5);
            double c3 = Math.Cos(v.z * 0.5);
            double s1 = Math.Sin(v.x * 0.5);
            double s2 = Math.Sin(v.y * 0.5);
            double s3 = Math.Sin(v.z * 0.5);

            x = s1 * c2 * c3 + c1 * s2 * s3;
            y = c1 * s2 * c3 - s1 * c2 * s3;
            z = s1 * s2 * c3 + c1 * c2 * s3;
            s = c1 * c2 * c3 - s1 * s2 * s3;

            return new LSL_Rotation(x, y, z, s);
        }

        public LSL_Rotation llAxes2Rot(LSL_Vector fwd, LSL_Vector left, LSL_Vector up)
        {
            m_host.AddScriptLPS(1);
            double s;
            double tr = fwd.x + left.y + up.z + 1.0;

            if (tr >= 1.0)
            {
                s = 0.5 / Math.Sqrt(tr);
                return new LSL_Rotation(
                        (left.z - up.y) * s,
                        (up.x - fwd.z) * s,
                        (fwd.y - left.x) * s,
                        0.25 / s);
            }
            else
            {
                double max = (left.y > up.z) ? left.y : up.z;

                if (max < fwd.x)
                {
                    s = Math.Sqrt(fwd.x - (left.y + up.z) + 1.0);
                    double x = s * 0.5;
                    s = 0.5 / s;
                    return new LSL_Rotation(
                            x,
                            (fwd.y + left.x) * s,
                            (up.x + fwd.z) * s,
                            (left.z - up.y) * s);
                }
                else if (max == left.y)
                {
                    s = Math.Sqrt(left.y - (up.z + fwd.x) + 1.0);
                    double y = s * 0.5;
                    s = 0.5 / s;
                    return new LSL_Rotation(
                            (fwd.y + left.x) * s,
                            y,
                            (left.z + up.y) * s,
                            (up.x - fwd.z) * s);
                }
                else
                {
                    s = Math.Sqrt(up.z - (fwd.x + left.y) + 1.0);
                    double z = s * 0.5;
                    s = 0.5 / s;
                    return new LSL_Rotation(
                            (up.x + fwd.z) * s,
                            (left.z + up.y) * s,
                            z,
                            (fwd.y - left.x) * s);
                }
            }
        }

        public LSL_Vector llRot2Fwd(LSL_Rotation r)
        {
            m_host.AddScriptLPS(1);

            double x, y, z, m;

            m = r.x * r.x + r.y * r.y + r.z * r.z + r.s * r.s;
            // m is always greater than zero
            // if m is not equal to 1 then Rotation needs to be normalized
            if (Math.Abs(1.0 - m) > 0.000001) // allow a little slop here for calculation precision
            {
                m = 1.0 / Math.Sqrt(m);
                r.x *= m;
                r.y *= m;
                r.z *= m;
                r.s *= m;
            }

            // Fast Algebric Calculations instead of Vectors & Quaternions Product
            x = r.x * r.x - r.y * r.y - r.z * r.z + r.s * r.s;
            y = 2 * (r.x * r.y + r.z * r.s);
            z = 2 * (r.x * r.z - r.y * r.s);
            return (new LSL_Vector(x, y, z));
        }

        public LSL_Vector llRot2Left(LSL_Rotation r)
        {
            m_host.AddScriptLPS(1);

            double x, y, z, m;

            m = r.x * r.x + r.y * r.y + r.z * r.z + r.s * r.s;
            // m is always greater than zero
            // if m is not equal to 1 then Rotation needs to be normalized
            if (Math.Abs(1.0 - m) > 0.000001) // allow a little slop here for calculation precision
            {
                m = 1.0 / Math.Sqrt(m);
                r.x *= m;
                r.y *= m;
                r.z *= m;
                r.s *= m;
            }

            // Fast Algebric Calculations instead of Vectors & Quaternions Product
            x = 2 * (r.x * r.y - r.z * r.s);
            y = -r.x * r.x + r.y * r.y - r.z * r.z + r.s * r.s;
            z = 2 * (r.x * r.s + r.y * r.z);
            return (new LSL_Vector(x, y, z));
        }

        public LSL_Vector llRot2Up(LSL_Rotation r)
        {
            m_host.AddScriptLPS(1);
            double x, y, z, m;

            m = r.x * r.x + r.y * r.y + r.z * r.z + r.s * r.s;
            // m is always greater than zero
            // if m is not equal to 1 then Rotation needs to be normalized
            if (Math.Abs(1.0 - m) > 0.000001) // allow a little slop here for calculation precision
            {
                m = 1.0 / Math.Sqrt(m);
                r.x *= m;
                r.y *= m;
                r.z *= m;
                r.s *= m;
            }

            // Fast Algebric Calculations instead of Vectors & Quaternions Product
            x = 2 * (r.x * r.z + r.y * r.s);
            y = 2 * (-r.x * r.s + r.y * r.z);
            z = -r.x * r.x - r.y * r.y + r.z * r.z + r.s * r.s;
            return (new LSL_Vector(x, y, z));
        }

        public LSL_Rotation llRotBetween(LSL_Vector a, LSL_Vector b)
        {
            //A and B should both be normalized
            m_host.AddScriptLPS(1);
            /*  This method is more accurate than the SL one, and thus causes problems
                for scripts that deal with the SL inaccuracy around 180-degrees -.- .._.
                
            double dotProduct = LSL_Vector.Dot(a, b);
            LSL_Vector crossProduct = LSL_Vector.Cross(a, b);
            double magProduct = LSL_Vector.Mag(a) * LSL_Vector.Mag(b);
            double angle = Math.Acos(dotProduct / magProduct);
            LSL_Vector axis = LSL_Vector.Norm(crossProduct);
            double s = Math.Sin(angle / 2);

            double x = axis.x * s;
            double y = axis.y * s;
            double z = axis.z * s;
            double w = Math.Cos(angle / 2);

            if (Double.IsNaN(x) || Double.IsNaN(y) || Double.IsNaN(z) || Double.IsNaN(w))
                return new LSL_Rotation(0.0f, 0.0f, 0.0f, 1.0f);

            return new LSL_Rotation((float)x, (float)y, (float)z, (float)w);
            */
            
            // This method mimics the 180 errors found in SL
            // See www.euclideanspace.com... angleBetween
			LSL_Vector vec_a = a;
			LSL_Vector vec_b = b;
			
			// Eliminate zero length
			LSL_Float vec_a_mag = LSL_Vector.Mag(vec_a);
			LSL_Float vec_b_mag = LSL_Vector.Mag(vec_b);
			if (vec_a_mag < 0.00001 ||
			    vec_b_mag < 0.00001)
			{
   				return new LSL_Rotation(0.0f, 0.0f, 0.0f, 1.0f);
			}
			
			// Normalize
			vec_a = llVecNorm(vec_a);
			vec_b = llVecNorm(vec_b);

			// Calculate axis and rotation angle
			LSL_Vector axis = vec_a % vec_b;
			LSL_Float cos_theta  = vec_a * vec_b;
 	
			// Check if parallel
			if (cos_theta > 0.99999)
			{
				return new LSL_Rotation(0.0f, 0.0f, 0.0f, 1.0f);
			}
			
			// Check if anti-parallel
			else if (cos_theta < -0.99999)
			{
				LSL_Vector orthog_axis = new LSL_Vector(1.0, 0.0, 0.0) - (vec_a.x / (vec_a * vec_a) * vec_a);
				if (LSL_Vector.Mag(orthog_axis)  < 0.000001)  orthog_axis = new LSL_Vector(0.0, 0.0, 1.0);
 	            return new LSL_Rotation((float)orthog_axis.x, (float)orthog_axis.y, (float)orthog_axis.z, 0.0);
			}
			else // other rotation
			{
				LSL_Float theta = (LSL_Float)Math.Acos(cos_theta) * 0.5f;
				axis = llVecNorm(axis);
	            double x, y, z, s, t;
	            s = Math.Cos(theta);
	            t = Math.Sin(theta);
	            x = axis.x * t;
	            y = axis.y * t;
	            z = axis.z * t;
	            return new LSL_Rotation(x,y,z,s);
	        }
        }
				
        public void llWhisper(int channelID, string text)
        {
            m_host.AddScriptLPS(1);

            if (text.Length > 1023)
                text = text.Substring(0, 1023);

            World.SimChat(Utils.StringToBytes(text),
                          ChatTypeEnum.Whisper, channelID, m_host.ParentGroup.RootPart.AbsolutePosition, m_host.Name, m_host.UUID, false);

            IWorldComm wComm = m_ScriptEngine.World.RequestModuleInterface<IWorldComm>();
            if (wComm != null)
                wComm.DeliverMessage(ChatTypeEnum.Whisper, channelID, m_host.Name, m_host.UUID, text);
        }

        public void llSay(int channelID, string text)
        {
            m_host.AddScriptLPS(1);

            if (m_scriptConsoleChannelEnabled && (channelID == m_scriptConsoleChannel))
            {
                Console.WriteLine(text);
            }
            else
            {
                if (text.Length > 1023)
                    text = text.Substring(0, 1023);

                World.SimChat(Utils.StringToBytes(text),
                              ChatTypeEnum.Say, channelID, m_host.ParentGroup.RootPart.AbsolutePosition, m_host.Name, m_host.UUID, false);

                IWorldComm wComm = m_ScriptEngine.World.RequestModuleInterface<IWorldComm>();
                if (wComm != null)
                    wComm.DeliverMessage(ChatTypeEnum.Say, channelID, m_host.Name, m_host.UUID, text);
            }
        }

        public void llShout(int channelID, string text)
        {
            m_host.AddScriptLPS(1);

            if (text.Length > 1023)
                text = text.Substring(0, 1023);

            World.SimChat(Utils.StringToBytes(text),
                          ChatTypeEnum.Shout, channelID, m_host.ParentGroup.RootPart.AbsolutePosition, m_host.Name, m_host.UUID, true);

            IWorldComm wComm = m_ScriptEngine.World.RequestModuleInterface<IWorldComm>();
            if (wComm != null)
                wComm.DeliverMessage(ChatTypeEnum.Shout, channelID, m_host.Name, m_host.UUID, text);
        }

        public void llRegionSay(int channelID, string text)
        {
            if (channelID == 0)
            {
                LSLError("Cannot use llRegionSay() on channel 0");
                return;
            }

            if (text.Length > 1023)
                text = text.Substring(0, 1023);

            m_host.AddScriptLPS(1);

            IWorldComm wComm = m_ScriptEngine.World.RequestModuleInterface<IWorldComm>();
            if (wComm != null)
                wComm.DeliverMessage(ChatTypeEnum.Region, channelID, m_host.Name, m_host.UUID, text);
        }

        public LSL_Integer llListen(int channelID, string name, string ID, string msg)
        {
            m_host.AddScriptLPS(1);
            UUID keyID;
            UUID.TryParse(ID, out keyID);
            IWorldComm wComm = m_ScriptEngine.World.RequestModuleInterface<IWorldComm>();
            if (wComm != null)
                return wComm.Listen(m_localID, m_itemID, m_host.UUID, channelID, name, keyID, msg);
            else
                return -1;
        }

        public void llListenControl(int number, int active)
        {
            m_host.AddScriptLPS(1);
            IWorldComm wComm = m_ScriptEngine.World.RequestModuleInterface<IWorldComm>();
            if (wComm != null)
                wComm.ListenControl(m_itemID, number, active);
        }

        public void llListenRemove(int number)
        {
            m_host.AddScriptLPS(1);
            IWorldComm wComm = m_ScriptEngine.World.RequestModuleInterface<IWorldComm>();
            if (wComm != null)
                wComm.ListenRemove(m_itemID, number);
        }

        public void llSensor(string name, string id, int type, double range, double arc)
        {
            m_host.AddScriptLPS(1);
            UUID keyID = UUID.Zero;
            UUID.TryParse(id, out keyID);

            AsyncCommands.SensorRepeatPlugin.SenseOnce(m_localID, m_itemID, name, keyID, type, range, arc, m_host);
       }

        public void llSensorRepeat(string name, string id, int type, double range, double arc, double rate)
        {
            m_host.AddScriptLPS(1);
            UUID keyID = UUID.Zero;
            UUID.TryParse(id, out keyID);

            AsyncCommands.SensorRepeatPlugin.SetSenseRepeatEvent(m_localID, m_itemID, name, keyID, type, range, arc, rate, m_host);
        }

        public void llSensorRemove()
        {
            m_host.AddScriptLPS(1);
            AsyncCommands.SensorRepeatPlugin.UnSetSenseRepeaterEvents(m_localID, m_itemID);
        }

        public string resolveName(UUID objecUUID)
        {
            // try avatar username surname
            CachedUserInfo profile = World.CommsManager.UserProfileCacheService.GetUserDetails(objecUUID);
            if (profile != null && profile.UserProfile != null)
            {
                string avatarname = profile.UserProfile.FirstName + " " + profile.UserProfile.SurName;
                return avatarname;
            }
            // try an scene object
            SceneObjectPart SOP = World.GetSceneObjectPart(objecUUID);
            if (SOP != null)
            {
                string objectname = SOP.Name;
                return objectname;
            }

            EntityBase SensedObject;
            World.Entities.TryGetValue(objecUUID, out SensedObject);

            if (SensedObject == null)
            {
                IGroupsModule groups = World.RequestModuleInterface<IGroupsModule>();
                if (groups != null)
                {
                    GroupRecord gr = groups.GetGroupRecord(objecUUID);
                    if (gr != null)
                        return gr.GroupName;
                }
                return String.Empty;
            }

            return SensedObject.Name;
        }

        public LSL_String llDetectedName(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (detectedParams == null)
                return String.Empty;
            return detectedParams.Name;
        }

        public LSL_String llDetectedKey(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (detectedParams == null)
                return String.Empty;
            return detectedParams.Key.ToString();
        }

        public LSL_String llDetectedOwner(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (detectedParams == null)
                return String.Empty;
            return detectedParams.Owner.ToString();
        }

        public LSL_Integer llDetectedType(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (detectedParams == null)
                return 0;
            return new LSL_Integer(detectedParams.Type);
        }

        public LSL_Vector llDetectedPos(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (detectedParams == null)
                return new LSL_Vector();
            return detectedParams.Position;
        }

        public LSL_Vector llDetectedVel(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (detectedParams == null)
                return new LSL_Vector();
            return detectedParams.Velocity;
        }

        public LSL_Vector llDetectedGrab(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams parms = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (parms == null)
                return new LSL_Vector(0, 0, 0);

            return parms.OffsetPos;
        }

        public LSL_Rotation llDetectedRot(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (detectedParams == null)
                return new LSL_Rotation();
            return detectedParams.Rotation;
        }

        public LSL_Integer llDetectedGroup(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (detectedParams == null)
                return new LSL_Integer(0);
            if (m_host.GroupID == detectedParams.Group)
                return new LSL_Integer(1);
            return new LSL_Integer(0);
        }

        public LSL_Integer llDetectedLinkNumber(int number)
        {
            m_host.AddScriptLPS(1);
            DetectParams parms = m_ScriptEngine.GetDetectParams(m_itemID, number);
            if (parms == null)
                return new LSL_Integer(0);

            return new LSL_Integer(parms.LinkNum);
        }

        /// <summary>
        /// See http://wiki.secondlife.com/wiki/LlDetectedTouchBinormal for details
        /// </summary>
        public LSL_Vector llDetectedTouchBinormal(int index)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, index);
            if (detectedParams == null)
                return new LSL_Vector();
            return detectedParams.TouchBinormal;
        }

        /// <summary>
        /// See http://wiki.secondlife.com/wiki/LlDetectedTouchFace for details
        /// </summary>
        public LSL_Integer llDetectedTouchFace(int index)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, index);
            if (detectedParams == null)
                return new LSL_Integer(-1);
            return new LSL_Integer(detectedParams.TouchFace);
        }

        /// <summary>
        /// See http://wiki.secondlife.com/wiki/LlDetectedTouchNormal for details
        /// </summary>
        public LSL_Vector llDetectedTouchNormal(int index)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, index);
            if (detectedParams == null)
                return new LSL_Vector();
            return detectedParams.TouchNormal;
        }

        /// <summary>
        /// See http://wiki.secondlife.com/wiki/LlDetectedTouchPos for details
        /// </summary>
        public LSL_Vector llDetectedTouchPos(int index)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, index);
            if (detectedParams == null)
                return new LSL_Vector();
            return detectedParams.TouchPos;
        }

        /// <summary>
        /// See http://wiki.secondlife.com/wiki/LlDetectedTouchST for details
        /// </summary>
        public LSL_Vector llDetectedTouchST(int index)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, index);
            if (detectedParams == null)
                return new LSL_Vector(-1.0, -1.0, 0.0);
            return detectedParams.TouchST;
        }

        /// <summary>
        /// See http://wiki.secondlife.com/wiki/LlDetectedTouchUV for details
        /// </summary>
        public LSL_Vector llDetectedTouchUV(int index)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, index);
            if (detectedParams == null)
                return new LSL_Vector(-1.0, -1.0, 0.0);
            return detectedParams.TouchUV;
        }

        [DebuggerNonUserCode]
        public virtual void llDie()
        {
            m_host.AddScriptLPS(1);
            if (!m_host.IsAttachment) throw new SelfDeleteException();
        }

        public LSL_Float llGround(LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            Vector3 pos = m_host.GetWorldPosition() + new Vector3((float)offset.x,
                                                                  (float)offset.y,
                                                                  (float)offset.z);

            //Get the slope normal.  This gives us the equation of the plane tangent to the slope.
            LSL_Vector vsn = llGroundNormal(offset);

            // Clamp to valid position
            if (pos.X < 0)
                pos.X = 0;
            else if (pos.X >= World.Heightmap.Width)
                pos.X = World.Heightmap.Width - 1;
            if (pos.Y < 0)
                pos.Y = 0;
            else if (pos.Y >= World.Heightmap.Height)
                pos.Y = World.Heightmap.Height - 1;

            //Get the height for the integer coordinates from the Heightmap
            float baseheight = (float)World.Heightmap[(int)pos.X, (int)pos.Y];

            //Calculate the difference between the actual coordinates and the integer coordinates
            float xdiff = pos.X - (float)((int)pos.X);
            float ydiff = pos.Y - (float)((int)pos.Y);

            //Use the equation of the tangent plane to adjust the height to account for slope

            return (((vsn.x * xdiff) + (vsn.y * ydiff)) / (-1 * vsn.z)) + baseheight;
        }

        public LSL_Float llCloud(LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            float cloudCover = 0f;
            ICloudModule module = World.RequestModuleInterface<ICloudModule>();
            if (module != null)
            {
                Vector3 pos = m_host.GetWorldPosition();
                int x = (int)(pos.X + offset.x);
                int y = (int)(pos.Y + offset.y);

                cloudCover = module.CloudCover(x, y, 0);

            }
            return cloudCover;
        }

        public LSL_Vector llWind(LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            LSL_Vector wind = new LSL_Vector(0, 0, 0);
            IWindModule module = World.RequestModuleInterface<IWindModule>();
            if (module != null)
            {
                Vector3 pos = m_host.GetWorldPosition();
                int x = (int)(pos.X + offset.x);
                int y = (int)(pos.Y + offset.y);

                Vector3 windSpeed = module.WindSpeed(x, y, 0);

                wind.x = windSpeed.X;
                wind.y = windSpeed.Y;
            }
            return wind;
        }

        public void llSetStatus(int status, int value)
        {
            if (m_host == null || m_host.ParentGroup == null || m_host.ParentGroup.IsDeleted)
                return;
            m_host.AddScriptLPS(1);

            int statusrotationaxis = 0;

            if ((status & ScriptBaseClass.STATUS_PHYSICS) == ScriptBaseClass.STATUS_PHYSICS)
            {
                if (value != 0)
                {
                    SceneObjectGroup group = m_host.ParentGroup;
                    if (group == null)
                        return;
                    bool allow = true;
                    foreach (SceneObjectPart part in group.Children.Values)
                    {
                        if (part.Scale.X > World.m_maxPhys || part.Scale.Y > World.m_maxPhys || part.Scale.Z > World.m_maxPhys)
                        {
                            allow = false;
                            break;
                        }
                    }

                    if (!allow)
                        return;
                    m_host.ScriptSetPhysicsStatus(true);
                }
                else
                    m_host.ScriptSetPhysicsStatus(false);
            }

            if ((status & ScriptBaseClass.STATUS_PHANTOM) == ScriptBaseClass.STATUS_PHANTOM)
            {
                if (value != 0)
                    m_host.ScriptSetPhantomStatus(true);
                else
                    m_host.ScriptSetPhantomStatus(false);
            }

            if ((status & ScriptBaseClass.STATUS_CAST_SHADOWS) == ScriptBaseClass.STATUS_CAST_SHADOWS)
            {
                m_host.AddFlag(PrimFlags.CastShadows);
            }

            if ((status & ScriptBaseClass.STATUS_ROTATE_X) == ScriptBaseClass.STATUS_ROTATE_X)
            {
                statusrotationaxis |= ScriptBaseClass.STATUS_ROTATE_X;
            }

            if ((status & ScriptBaseClass.STATUS_ROTATE_Y) == ScriptBaseClass.STATUS_ROTATE_Y)
            {
                statusrotationaxis |= ScriptBaseClass.STATUS_ROTATE_Y;
            }

            if ((status & ScriptBaseClass.STATUS_ROTATE_Z) == ScriptBaseClass.STATUS_ROTATE_Z)
            {
                statusrotationaxis |= ScriptBaseClass.STATUS_ROTATE_Z;
            }

            if ((status & ScriptBaseClass.STATUS_BLOCK_GRAB) == ScriptBaseClass.STATUS_BLOCK_GRAB)
            {
                if (value != 0)
                    m_host.SetBlockGrab(true);
                else
                    m_host.SetBlockGrab(false);
            }

            if ((status & ScriptBaseClass.STATUS_DIE_AT_EDGE) == ScriptBaseClass.STATUS_DIE_AT_EDGE)
            {
                if (value != 0)
                    m_host.SetDieAtEdge(true);
                else
                    m_host.SetDieAtEdge(false);
            }

            if ((status & ScriptBaseClass.STATUS_RETURN_AT_EDGE) == ScriptBaseClass.STATUS_RETURN_AT_EDGE)
            {
                if (value != 0)
                    m_host.SetReturnAtEdge(true);
                else
                    m_host.SetReturnAtEdge(false);
            }

            if ((status & ScriptBaseClass.STATUS_SANDBOX) == ScriptBaseClass.STATUS_SANDBOX)
            {
                if (value != 0)
                    m_host.SetStatusSandbox(true);
                else
                    m_host.SetStatusSandbox(false);
            }

            if (statusrotationaxis != 0)
            {
                m_host.SetAxisRotation(statusrotationaxis, value);
            }
        }

        public LSL_Integer llGetStatus(int status)
        {
            m_host.AddScriptLPS(1);
            // m_log.Debug(m_host.ToString() + " status is " + m_host.GetEffectiveObjectFlags().ToString());
            switch (status)
            {
                case ScriptBaseClass.STATUS_PHYSICS:
                    if ((m_host.GetEffectiveObjectFlags() & (uint)PrimFlags.Physics) == (uint)PrimFlags.Physics)
                    {
                        return 1;
                    }
                    return 0;

                case ScriptBaseClass.STATUS_PHANTOM:
                    if ((m_host.GetEffectiveObjectFlags() & (uint)PrimFlags.Phantom) == (uint)PrimFlags.Phantom)
                    {
                        return 1;
                    }
                    return 0;

                case ScriptBaseClass.STATUS_CAST_SHADOWS:
                    if ((m_host.GetEffectiveObjectFlags() & (uint)PrimFlags.CastShadows) == (uint)PrimFlags.CastShadows)
                    {
                        return 1;
                    }
                    return 0;

                case ScriptBaseClass.STATUS_BLOCK_GRAB:
                    if (m_host.GetBlockGrab())
                        return 1;
                    else
                        return 0;

                case ScriptBaseClass.STATUS_DIE_AT_EDGE:
                    if (m_host.GetDieAtEdge())
                        return 1;
                    else
                        return 0;

                case ScriptBaseClass.STATUS_RETURN_AT_EDGE:
                    if (m_host.GetReturnAtEdge())
                        return 1;
                    else
                        return 0;

                case ScriptBaseClass.STATUS_ROTATE_X:
                    if (m_host.GetAxisRotation(2) == 2)
                        return 1;
                    else
                        return 0;

                case ScriptBaseClass.STATUS_ROTATE_Y:
                    if (m_host.GetAxisRotation(4) == 4)
                        return 1;
                    else
                        return 0;

                case ScriptBaseClass.STATUS_ROTATE_Z:
                    if (m_host.GetAxisRotation(8) == 8)
                        return 1;
                    else
                        return 0;

                case ScriptBaseClass.STATUS_SANDBOX:
                    if (m_host.GetStatusSandbox())
                        return 1;
                    else
                        return 0;
            }
            return 0;
        }

        public void llSetScale(LSL_Vector scale)
        {
            m_host.AddScriptLPS(1);
            SetScale(m_host, scale);
        }

        protected void SetScale(SceneObjectPart part, LSL_Vector scale)
        {
            // TODO: this needs to trigger a persistance save as well
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;
            if (scale.x < 0.01)
                scale.x = 0.01;
            if (scale.y < 0.01)
                scale.y = 0.01;
            if (scale.z < 0.01)
                scale.z = 0.01;

            if (part.ParentGroup.RootPart.PhysActor != null && part.ParentGroup.RootPart.PhysActor.IsPhysical)
            {
                if (scale.x > World.m_maxPhys)
                    scale.x = World.m_maxPhys;
                if (scale.y > World.m_maxPhys)
                    scale.y = World.m_maxPhys;
                if (scale.z > World.m_maxPhys)
                    scale.z = World.m_maxPhys;
            }

            if (scale.x > World.m_maxNonphys)
                scale.x = World.m_maxNonphys;
            if (scale.y > World.m_maxNonphys)
                scale.y = World.m_maxNonphys;
            if (scale.z > World.m_maxNonphys)
                scale.z = World.m_maxNonphys;

            Vector3 tmp = part.Scale;
            tmp.X = (float)scale.x;
            tmp.Y = (float)scale.y;
            tmp.Z = (float)scale.z;
            part.Scale = tmp;
            part.SendFullUpdateToAllClients();
        }

        public LSL_Vector llGetScale()
        {
            m_host.AddScriptLPS(1);
            return new LSL_Vector(m_host.Scale.X, m_host.Scale.Y, m_host.Scale.Z);
        }

        public void llSetClickAction(int action)
        {
            m_host.AddScriptLPS(1);
            m_host.ClickAction = (byte)action;
            if (m_host.ParentGroup != null) m_host.ParentGroup.HasGroupChanged = true;
            m_host.ScheduleFullUpdate();
            return;
        }

        public void llSetColor(LSL_Vector color, int face)
        {
            m_host.AddScriptLPS(1);

            SetColor(m_host, color, face);
        }

        protected void SetColor(SceneObjectPart part, LSL_Vector color, int face)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            Primitive.TextureEntry tex = part.Shape.Textures;
            Color4 texcolor;
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                texcolor = tex.CreateFace((uint)face).RGBA;
                texcolor.R = Util.Clip((float)color.x, 0.0f, 1.0f);
                texcolor.G = Util.Clip((float)color.y, 0.0f, 1.0f);
                texcolor.B = Util.Clip((float)color.z, 0.0f, 1.0f);
                tex.FaceTextures[face].RGBA = texcolor;
                part.UpdateTexture(tex);
                return;
            }
            else if (face == ScriptBaseClass.ALL_SIDES)
            {
                for (uint i = 0; i < GetNumberOfSides(part); i++)
                {
                    if (tex.FaceTextures[i] != null)
                    {
                        texcolor = tex.FaceTextures[i].RGBA;
                        texcolor.R = Util.Clip((float)color.x, 0.0f, 1.0f);
                        texcolor.G = Util.Clip((float)color.y, 0.0f, 1.0f);
                        texcolor.B = Util.Clip((float)color.z, 0.0f, 1.0f);
                        tex.FaceTextures[i].RGBA = texcolor;
                    }
                    texcolor = tex.DefaultTexture.RGBA;
                    texcolor.R = Util.Clip((float)color.x, 0.0f, 1.0f);
                    texcolor.G = Util.Clip((float)color.y, 0.0f, 1.0f);
                    texcolor.B = Util.Clip((float)color.z, 0.0f, 1.0f);
                    tex.DefaultTexture.RGBA = texcolor;
                }
                part.UpdateTexture(tex);
                return;
            }

            if (face == ScriptBaseClass.ALL_SIDES)
                face = SceneObjectPart.ALL_SIDES;
            
            m_host.SetFaceColor(new Vector3((float)color.x, (float)color.y, (float)color.z), face);
        }

        public void SetTexGen(SceneObjectPart part, int face,int style)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            Primitive.TextureEntry tex = part.Shape.Textures;
            MappingType textype;
            textype = MappingType.Default;
            if (style == (int)ScriptBaseClass.PRIM_TEXGEN_PLANAR)
                textype = MappingType.Planar;

            if (face >= 0 && face < GetNumberOfSides(part))
            {
                tex.CreateFace((uint) face);
                tex.FaceTextures[face].TexMapType = textype;
                part.UpdateTexture(tex);
                return;
            }
            else if (face == ScriptBaseClass.ALL_SIDES)
            {
                for (uint i = 0; i < GetNumberOfSides(part); i++)
                {
                    if (tex.FaceTextures[i] != null)
                    {
                        tex.FaceTextures[i].TexMapType = textype;
                    }
                    tex.DefaultTexture.TexMapType = textype;
                }
                part.UpdateTexture(tex);
                return;
            }
        }

        public void SetGlow(SceneObjectPart part, int face, float glow)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            Primitive.TextureEntry tex = part.Shape.Textures;
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                tex.CreateFace((uint) face);
                tex.FaceTextures[face].Glow = glow;
                part.UpdateTexture(tex);
                return;
            }
            else if (face == ScriptBaseClass.ALL_SIDES)
            {
                for (uint i = 0; i < GetNumberOfSides(part); i++)
                {
                    if (tex.FaceTextures[i] != null)
                    {
                        tex.FaceTextures[i].Glow = glow;
                    }
                    tex.DefaultTexture.Glow = glow;
                }
                part.UpdateTexture(tex);
                return;
            }
        }

        public void SetShiny(SceneObjectPart part, int face, int shiny, Bumpiness bump)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            Shininess sval = new Shininess();

            switch (shiny)
            {
            case 0:
                sval = Shininess.None;
                break;
            case 1:
                sval = Shininess.Low;
                break;
            case 2:
                sval = Shininess.Medium;
                break;
            case 3:
                sval = Shininess.High;
                break;
            default:
                sval = Shininess.None;
                break;
            }

            Primitive.TextureEntry tex = part.Shape.Textures;
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                tex.CreateFace((uint) face);
                tex.FaceTextures[face].Shiny = sval;
                tex.FaceTextures[face].Bump = bump;
                part.UpdateTexture(tex);
                return;
            }
            else if (face == ScriptBaseClass.ALL_SIDES)
            {
                for (uint i = 0; i < GetNumberOfSides(part); i++)
                {
                    if (tex.FaceTextures[i] != null)
                    {
                        tex.FaceTextures[i].Shiny = sval;
                        tex.FaceTextures[i].Bump = bump;;
                    }
                    tex.DefaultTexture.Shiny = sval;
                    tex.DefaultTexture.Bump = bump;
                }
                part.UpdateTexture(tex);
                return;
            }
        }

        public void SetFullBright(SceneObjectPart part, int face, bool bright)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

             Primitive.TextureEntry tex = part.Shape.Textures;
             if (face >= 0 && face < GetNumberOfSides(part))
             {
                 tex.CreateFace((uint) face);
                 tex.FaceTextures[face].Fullbright = bright;
                 part.UpdateTexture(tex);
                 return;
             }
             else if (face == ScriptBaseClass.ALL_SIDES)
             {
                 for (uint i = 0; i < GetNumberOfSides(part); i++)
                 {
                     if (tex.FaceTextures[i] != null)
                     {
                         tex.FaceTextures[i].Fullbright = bright;
                     }
                 }
                 tex.DefaultTexture.Fullbright = bright;
                 part.UpdateTexture(tex);
                 return;
             }
         }

        public LSL_Float llGetAlpha(int face)
        {
            m_host.AddScriptLPS(1);

            return GetAlpha(m_host, face);
        }

        protected LSL_Float GetAlpha(SceneObjectPart part, int face)
        {
            Primitive.TextureEntry tex = part.Shape.Textures;
            if (face == ScriptBaseClass.ALL_SIDES)
            {
                int i;
                double sum = 0.0;
                for (i = 0 ; i < GetNumberOfSides(part); i++)
                    sum += (double)tex.GetFace((uint)i).RGBA.A;
                return sum;
            }
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                return (double)tex.GetFace((uint)face).RGBA.A;
            }
            return 0.0;
        }

        public void llSetAlpha(double alpha, int face)
        {
            m_host.AddScriptLPS(1);

            SetAlpha(m_host, alpha, face);
        }

        public void llSetLinkAlpha(int linknumber, double alpha, int face)
        {
            m_host.AddScriptLPS(1);

            List<SceneObjectPart> parts = GetLinkParts(linknumber);

            foreach (SceneObjectPart part in parts)
                SetAlpha(part, alpha, face);
        }

        protected void SetAlpha(SceneObjectPart part, double alpha, int face)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            Primitive.TextureEntry tex = part.Shape.Textures;
            Color4 texcolor;
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                texcolor = tex.CreateFace((uint)face).RGBA;
                texcolor.A = Util.Clip((float)alpha, 0.0f, 1.0f);
                tex.FaceTextures[face].RGBA = texcolor;
                part.UpdateTexture(tex);
                return;
            }
            else if (face == ScriptBaseClass.ALL_SIDES)
            {
                for (int i = 0; i < GetNumberOfSides(part); i++)
                {
                    if (tex.FaceTextures[i] != null)
                    {
                        texcolor = tex.FaceTextures[i].RGBA;
                        texcolor.A = Util.Clip((float)alpha, 0.0f, 1.0f);
                        tex.FaceTextures[i].RGBA = texcolor;
                    }
                }
                texcolor = tex.DefaultTexture.RGBA;
                texcolor.A = Util.Clip((float)alpha, 0.0f, 1.0f);
                tex.DefaultTexture.RGBA = texcolor;
                part.UpdateTexture(tex);
                return;
            }
        }

        /// <summary>
        /// Set flexi parameters of a part.
        ///
        /// FIXME: Much of this code should probably be within the part itself.
        /// </summary>
        /// <param name="part"></param>
        /// <param name="flexi"></param>
        /// <param name="softness"></param>
        /// <param name="gravity"></param>
        /// <param name="friction"></param>
        /// <param name="wind"></param>
        /// <param name="tension"></param>
        /// <param name="Force"></param>
        protected void SetFlexi(SceneObjectPart part, bool flexi, int softness, float gravity, float friction,
            float wind, float tension, LSL_Vector Force)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            if (flexi)
            {
                part.Shape.FlexiEntry = true;   // this setting flexi true isn't working, but the below parameters do
                                                // work once the prim is already flexi
                part.Shape.FlexiSoftness = softness;
                part.Shape.FlexiGravity = gravity;
                part.Shape.FlexiDrag = friction;
                part.Shape.FlexiWind = wind;
                part.Shape.FlexiTension = tension;
                part.Shape.FlexiForceX = (float)Force.x;
                part.Shape.FlexiForceY = (float)Force.y;
                part.Shape.FlexiForceZ = (float)Force.z;
                part.Shape.PathCurve = 0x80;
            }

            part.ParentGroup.HasGroupChanged = true;
            part.ScheduleFullUpdate();
        }

        /// <summary>
        /// Set a light point on a part
        /// </summary>
        /// FIXME: Much of this code should probably be in SceneObjectGroup
        ///
        /// <param name="part"></param>
        /// <param name="light"></param>
        /// <param name="color"></param>
        /// <param name="intensity"></param>
        /// <param name="radius"></param>
        /// <param name="falloff"></param>
        protected void SetPointLight(SceneObjectPart part, bool light, LSL_Vector color, float intensity, float radius, float falloff)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            if (light)
            {
                part.Shape.LightEntry = true;
                part.Shape.LightColorR = Util.Clip((float)color.x, 0.0f, 1.0f);
                part.Shape.LightColorG = Util.Clip((float)color.y, 0.0f, 1.0f);
                part.Shape.LightColorB = Util.Clip((float)color.z, 0.0f, 1.0f);
                part.Shape.LightIntensity = intensity;
                part.Shape.LightRadius = radius;
                part.Shape.LightFalloff = falloff;
            }
            else
            {
                part.Shape.LightEntry = false;
            }

            part.ParentGroup.HasGroupChanged = true;
            part.ScheduleFullUpdate();
        }

        public LSL_Vector llGetColor(int face)
        {
            m_host.AddScriptLPS(1);
            return GetColor(m_host, face);
        }

        protected LSL_Vector GetColor(SceneObjectPart part, int face)
        {
            Primitive.TextureEntry tex = part.Shape.Textures;
            Color4 texcolor;
            LSL_Vector rgb = new LSL_Vector();
            if (face == ScriptBaseClass.ALL_SIDES)
            {
                int i;

                for (i = 0 ; i < GetNumberOfSides(part); i++)
                {
                    texcolor = tex.GetFace((uint)i).RGBA;
                    rgb.x += texcolor.R;
                    rgb.y += texcolor.G;
                    rgb.z += texcolor.B;
                }

                rgb.x /= (float)GetNumberOfSides(part);
                rgb.y /= (float)GetNumberOfSides(part);
                rgb.z /= (float)GetNumberOfSides(part);

                return rgb;
            }
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                texcolor = tex.GetFace((uint)face).RGBA;
                rgb.x = texcolor.R;
                rgb.y = texcolor.G;
                rgb.z = texcolor.B;
                return rgb;
            }
            else
            {
                return new LSL_Vector();
            }
        }

        public void llSetTexture(string texture, int face)
        {
            m_host.AddScriptLPS(1);
            SetTexture(m_host, texture, face);
            ScriptSleep(200);
        }

        public void llSetLinkTexture(int linknumber, string texture, int face)
        {
            m_host.AddScriptLPS(1);

            List<SceneObjectPart> parts = GetLinkParts(linknumber);

            foreach (SceneObjectPart part in parts)
              SetTexture(part, texture, face);

            ScriptSleep(200);
        }

        protected void SetTexture(SceneObjectPart part, string texture, int face)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            UUID textureID=new UUID();

            if (!UUID.TryParse(texture, out textureID))
            {
                textureID=InventoryKey(texture, (int)AssetType.Texture);
            }

            if (textureID == UUID.Zero)
                return;

            Primitive.TextureEntry tex = part.Shape.Textures;

            if (face >= 0 && face < GetNumberOfSides(part))
            {
                Primitive.TextureEntryFace texface = tex.CreateFace((uint)face);
                texface.TextureID = textureID;
                tex.FaceTextures[face] = texface;
                part.UpdateTexture(tex);
                return;
            }
            else if (face == ScriptBaseClass.ALL_SIDES)
            {
                for (uint i = 0; i < GetNumberOfSides(part); i++)
                {
                    if (tex.FaceTextures[i] != null)
                    {
                        tex.FaceTextures[i].TextureID = textureID;
                    }
                }
                tex.DefaultTexture.TextureID = textureID;
                part.UpdateTexture(tex);
                return;
            }
        }

        public void llScaleTexture(double u, double v, int face)
        {
            m_host.AddScriptLPS(1);

            ScaleTexture(m_host, u, v, face);
            ScriptSleep(200);
        }

        protected void ScaleTexture(SceneObjectPart part, double u, double v, int face)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            Primitive.TextureEntry tex = part.Shape.Textures;
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                Primitive.TextureEntryFace texface = tex.CreateFace((uint)face);
                texface.RepeatU = (float)u;
                texface.RepeatV = (float)v;
                tex.FaceTextures[face] = texface;
                part.UpdateTexture(tex);
                return;
            }
            if (face == ScriptBaseClass.ALL_SIDES)
            {
                for (int i = 0; i < GetNumberOfSides(part); i++)
                {
                    if (tex.FaceTextures[i] != null)
                    {
                        tex.FaceTextures[i].RepeatU = (float)u;
                        tex.FaceTextures[i].RepeatV = (float)v;
                    }
                }
                tex.DefaultTexture.RepeatU = (float)u;
                tex.DefaultTexture.RepeatV = (float)v;
                part.UpdateTexture(tex);
                return;
            }
        }

        public void llOffsetTexture(double u, double v, int face)
        {
            m_host.AddScriptLPS(1);
            OffsetTexture(m_host, u, v, face);
            ScriptSleep(200);
        }

        protected void OffsetTexture(SceneObjectPart part, double u, double v, int face)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            Primitive.TextureEntry tex = part.Shape.Textures;
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                Primitive.TextureEntryFace texface = tex.CreateFace((uint)face);
                texface.OffsetU = (float)u;
                texface.OffsetV = (float)v;
                tex.FaceTextures[face] = texface;
                part.UpdateTexture(tex);
                return;
            }
            if (face == ScriptBaseClass.ALL_SIDES)
            {
                for (int i = 0; i < GetNumberOfSides(part); i++)
                {
                    if (tex.FaceTextures[i] != null)
                    {
                        tex.FaceTextures[i].OffsetU = (float)u;
                        tex.FaceTextures[i].OffsetV = (float)v;
                    }
                }
                tex.DefaultTexture.OffsetU = (float)u;
                tex.DefaultTexture.OffsetV = (float)v;
                part.UpdateTexture(tex);
                return;
            }
        }

        public void llRotateTexture(double rotation, int face)
        {
            m_host.AddScriptLPS(1);
            RotateTexture(m_host, rotation, face);
            ScriptSleep(200);
        }

        protected void RotateTexture(SceneObjectPart part, double rotation, int face)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            Primitive.TextureEntry tex = part.Shape.Textures;
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                Primitive.TextureEntryFace texface = tex.CreateFace((uint)face);
                texface.Rotation = (float)rotation;
                tex.FaceTextures[face] = texface;
                part.UpdateTexture(tex);
                return;
            }
            if (face == ScriptBaseClass.ALL_SIDES)
            {
                for (int i = 0; i < GetNumberOfSides(part); i++)
                {
                    if (tex.FaceTextures[i] != null)
                    {
                        tex.FaceTextures[i].Rotation = (float)rotation;
                    }
                }
                tex.DefaultTexture.Rotation = (float)rotation;
                part.UpdateTexture(tex);
                return;
            }
        }

        public LSL_String llGetTexture(int face)
        {
            m_host.AddScriptLPS(1);
            return GetTexture(m_host, face);
        }

        protected LSL_String GetTexture(SceneObjectPart part, int face)
        {
            Primitive.TextureEntry tex = part.Shape.Textures;
            if (face == ScriptBaseClass.ALL_SIDES)
            {
                face = 0;
            }
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                Primitive.TextureEntryFace texface;
                texface = tex.GetFace((uint)face);
                return texface.TextureID.ToString();
            }
            else
            {
                return String.Empty;
            }
        }

        public void llSetPos(LSL_Vector pos)
        {
            m_host.AddScriptLPS(1);

            SetPos(m_host, pos);

            ScriptSleep(200);
        }

        // Capped movemment if distance > 10m (http://wiki.secondlife.com/wiki/LlSetPos)
        // note linked setpos is capped "differently"
        private LSL_Vector SetPosAdjust(LSL_Vector start, LSL_Vector end)
        {
            if (llVecDist(start, end) > 10.0f * m_ScriptDistanceFactor)
                return start + m_ScriptDistanceFactor * 10.0f * llVecNorm(end - start);
            else
                return end;
        }

        protected void SetPos(SceneObjectPart part, LSL_Vector targetPos)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            // Capped movemment if distance > 10m (http://wiki.secondlife.com/wiki/LlSetPos)
            LSL_Vector currentPos = llGetLocalPos();

            float ground = World.GetGroundHeight((float)targetPos.x, (float)targetPos.y);
            bool disable_underground_movement = m_ScriptEngine.Config.GetBoolean("DisableUndergroundMovement", true);

            if (part.ParentGroup == null)
            {
                if ((targetPos.z < ground) && disable_underground_movement)
                    targetPos.z = ground;
                    LSL_Vector real_vec = SetPosAdjust(currentPos, targetPos);
                    part.UpdateOffSet(new Vector3((float)real_vec.x, (float)real_vec.y, (float)real_vec.z));
            }
            else if (part.ParentGroup.RootPart == part)
            {
                if ((targetPos.z < ground) && disable_underground_movement)
                    targetPos.z = ground;
                SceneObjectGroup parent = part.ParentGroup;
                LSL_Vector real_vec = SetPosAdjust(currentPos, targetPos);
                parent.UpdateGroupPosition(new Vector3((float)real_vec.x, (float)real_vec.y, (float)real_vec.z));
            }
            else
            {
                //it's late... i think this is right ?
                if (llVecDist(new LSL_Vector(0,0,0), targetPos) <= 10.0f)
                {
                    part.OffsetPosition = new Vector3((float)targetPos.x, (float)targetPos.y, (float)targetPos.z);
                    SceneObjectGroup parent = part.ParentGroup;
                    parent.HasGroupChanged = true;
                    parent.ScheduleGroupForTerseUpdate();
                }
            }
        }

        public LSL_Vector llGetPos()
        {
            m_host.AddScriptLPS(1);
            Vector3 pos = m_host.GetWorldPosition();
            return new LSL_Vector(pos.X, pos.Y, pos.Z);
        }

        public LSL_Vector llGetLocalPos()
        {
            m_host.AddScriptLPS(1);
            if (m_host.ParentID != 0)
            {
                return new LSL_Vector(m_host.OffsetPosition.X,
                                      m_host.OffsetPosition.Y,
                                      m_host.OffsetPosition.Z);
            }
            else
            {
                return new LSL_Vector(m_host.AbsolutePosition.X,
                                      m_host.AbsolutePosition.Y,
                                      m_host.AbsolutePosition.Z);
            }
        }

        public void llSetRot(LSL_Rotation rot)
        {
            m_host.AddScriptLPS(1);

            // try to let this work as in SL...
            if (m_host.ParentID == 0)
            {
                // special case: If we are root, rotate complete SOG to new rotation
                SetRot(m_host, Rot2Quaternion(rot));
            }
            else
            {
                // we are a child. The rotation values will be set to the one of root modified by rot, as in SL. Don't ask.
                SceneObjectGroup group = m_host.ParentGroup;
                if (group != null) // a bit paranoid, maybe
                {
                    SceneObjectPart rootPart = group.RootPart;
                    if (rootPart != null) // again, better safe than sorry
                    {
                        SetRot(m_host, rootPart.RotationOffset * Rot2Quaternion(rot));
                    }
                }
            }

            ScriptSleep(200);
        }

        public void llSetLocalRot(LSL_Rotation rot)
        {
            m_host.AddScriptLPS(1);
            SetRot(m_host, Rot2Quaternion(rot));
            ScriptSleep(200);
        }

        protected void SetRot(SceneObjectPart part, Quaternion rot)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            part.UpdateRotation(rot);
            // Update rotation does not move the object in the physics scene if it's a linkset.

//KF:  Do NOT use this next line if using ODE physics engine. This need a switch based on .ini Phys Engine type
//          part.ParentGroup.AbsolutePosition = part.ParentGroup.AbsolutePosition;
            
            // So, after thinking about this for a bit, the issue with the part.ParentGroup.AbsolutePosition = part.ParentGroup.AbsolutePosition line
            // is it isn't compatible with vehicles because it causes the vehicle body to have to be broken down and rebuilt
            // It's perfectly okay when the object is not an active physical body though.
            // So, part.ParentGroup.ResetChildPrimPhysicsPositions(); does the thing that Kitto is warning against
            // but only if the object is not physial and active.   This is important for rotating doors.
            // without the absoluteposition = absoluteposition happening, the doors do not move in the physics
            // scene
            if (part.PhysActor != null && !part.PhysActor.IsPhysical)
            {
                part.ParentGroup.ResetChildPrimPhysicsPositions();
            }
        }

        /// <summary>
        /// See http://lslwiki.net/lslwiki/wakka.php?wakka=ChildRotation
        /// </summary>
        public LSL_Rotation llGetRot()
        {
            // unlinked or root prim then use llRootRotation
            // see llRootRotaion for references.
            if (m_host.LinkNum == 0 || m_host.LinkNum == 1)
            {
                return llGetRootRotation();
            }
            m_host.AddScriptLPS(1);
            Quaternion q = m_host.GetWorldRotation();
            return new LSL_Rotation(q.X, q.Y, q.Z, q.W);
        }

        private LSL_Rotation GetPartRot(SceneObjectPart part)
        {
            Quaternion q;
            if (part.LinkNum == 0 || part.LinkNum == 1) // unlinked or root prim
            {
                if (part.ParentGroup.RootPart.AttachmentPoint != 0)
                {
                    ScenePresence avatar = World.GetScenePresence(part.AttachedAvatar);
                    if (avatar != null)
                    {
                        if ((avatar.AgentControlFlags & (uint)AgentManager.ControlFlags.AGENT_CONTROL_MOUSELOOK) != 0)
                            q = avatar.CameraRotation; // Mouselook
                        else
                            q = avatar.Rotation; // Currently infrequently updated so may be inaccurate
                    }
                    else
                        q = part.ParentGroup.GroupRotation; // Likely never get here but just in case
                }
                else
                    q = part.ParentGroup.GroupRotation; // just the group rotation
                return new LSL_Rotation(q.X, q.Y, q.Z, q.W);
            }
            q = part.GetWorldRotation();
            return new LSL_Rotation(q.X, q.Y, q.Z, q.W);
        }

        public LSL_Rotation llGetLocalRot()
        {
            m_host.AddScriptLPS(1);
            return new LSL_Rotation(m_host.RotationOffset.X, m_host.RotationOffset.Y, m_host.RotationOffset.Z, m_host.RotationOffset.W);
        }

        public void llSetForce(LSL_Vector force, int local)
        {
            m_host.AddScriptLPS(1);

            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    if (local != 0)
                        force *= llGetRot();

                    m_host.ParentGroup.RootPart.SetForce(new Vector3((float)force.x, (float)force.y, (float)force.z));
                }
            }
        }

        public LSL_Vector llGetForce()
        {
            LSL_Vector force = new LSL_Vector(0.0, 0.0, 0.0);

            m_host.AddScriptLPS(1);

            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    Vector3 tmpForce = m_host.ParentGroup.RootPart.GetForce();
                    force.x = tmpForce.X;
                    force.y = tmpForce.Y;
                    force.z = tmpForce.Z;
                }
            }

            return force;
        }

        public LSL_Integer llTarget(LSL_Vector position, double range)
        {
            m_host.AddScriptLPS(1);
            return m_host.registerTargetWaypoint(new Vector3((float)position.x, (float)position.y, (float)position.z), (float)range);
        }

        public void llTargetRemove(int number)
        {
            m_host.AddScriptLPS(1);
            m_host.unregisterTargetWaypoint(number);
        }

        public LSL_Integer llRotTarget(LSL_Rotation rot, double error)
        {
            m_host.AddScriptLPS(1);
            return m_host.registerRotTargetWaypoint(new Quaternion((float)rot.x, (float)rot.y, (float)rot.z, (float)rot.s), (float)error);
        }

        public void llRotTargetRemove(int number)
        {
            m_host.AddScriptLPS(1);
            m_host.unregisterRotTargetWaypoint(number);
        }

        public void llMoveToTarget(LSL_Vector target, double tau)
        {
            m_host.AddScriptLPS(1);
            m_host.MoveToTarget(new Vector3((float)target.x, (float)target.y, (float)target.z), (float)tau);
        }

        public void llStopMoveToTarget()
        {
            m_host.AddScriptLPS(1);
            m_host.StopMoveToTarget();
        }

        public void llApplyImpulse(LSL_Vector force, int local)
        {
            m_host.AddScriptLPS(1);
            //No energy force yet
            Vector3 v = new Vector3((float)force.x, (float)force.y, (float)force.z);
            if (v.Length() > 20000.0f)
            {
                v.Normalize();
                v = v * 20000.0f;
            }
            m_host.ApplyImpulse(v, local != 0);
        }

        public void llApplyRotationalImpulse(LSL_Vector force, int local)
        {
            m_host.AddScriptLPS(1);
            m_host.ApplyAngularImpulse(new Vector3((float)force.x, (float)force.y, (float)force.z), local != 0);
        }

        public void llSetTorque(LSL_Vector torque, int local)
        {
            m_host.AddScriptLPS(1);
            m_host.SetAngularImpulse(new Vector3((float)torque.x, (float)torque.y, (float)torque.z), local != 0);
        }

        public LSL_Vector llGetTorque()
        {
            m_host.AddScriptLPS(1);
            Vector3 torque = m_host.GetTorque();
            return new LSL_Vector(torque.X,torque.Y,torque.Z);
        }

        public void llSetForceAndTorque(LSL_Vector force, LSL_Vector torque, int local)
        {
            m_host.AddScriptLPS(1);
            llSetForce(force, local);
            llSetTorque(torque, local);
        }

        public LSL_Vector llGetVel()
        {
            m_host.AddScriptLPS(1);
            return new LSL_Vector(m_host.Velocity.X, m_host.Velocity.Y, m_host.Velocity.Z);
        }

        public LSL_Vector llGetAccel()
        {
            m_host.AddScriptLPS(1);
            return new LSL_Vector(m_host.Acceleration.X, m_host.Acceleration.Y, m_host.Acceleration.Z);
        }

        public LSL_Vector llGetOmega()
        {
            m_host.AddScriptLPS(1);
            return new LSL_Vector(m_host.AngularVelocity.X, m_host.AngularVelocity.Y, m_host.AngularVelocity.Z);
        }

        public LSL_Float llGetTimeOfDay()
        {
            m_host.AddScriptLPS(1);
            return (double)((DateTime.Now.TimeOfDay.TotalMilliseconds / 1000) % (3600 * 4));
        }

        public LSL_Float llGetWallclock()
        {
            m_host.AddScriptLPS(1);
            return DateTime.Now.TimeOfDay.TotalSeconds;
        }

        public LSL_Float llGetTime()
        {
            m_host.AddScriptLPS(1);
            TimeSpan ScriptTime = DateTime.Now - m_timer;
            return (double)(ScriptTime.TotalMilliseconds / 1000);
        }

        public void llResetTime()
        {
            m_host.AddScriptLPS(1);
            m_timer = DateTime.Now;
        }

        public LSL_Float llGetAndResetTime()
        {
            m_host.AddScriptLPS(1);
            TimeSpan ScriptTime = DateTime.Now - m_timer;
            m_timer = DateTime.Now;
            return (double)(ScriptTime.TotalMilliseconds / 1000);
        }

        public void llSound(string sound, double volume, int queue, int loop)
        {
            m_host.AddScriptLPS(1);
            // This function has been deprecated
            // see http://www.lslwiki.net/lslwiki/wakka.php?wakka=llSound
            Deprecated("llSound");
        }

        // Xantor 20080528 PlaySound updated so it accepts an objectinventory name -or- a key to a sound
        // 20080530 Updated to remove code duplication
        public void llPlaySound(string sound, double volume)
        {
            m_host.AddScriptLPS(1);

            // send the sound, once, to all clients in range
            m_host.SendSound(KeyOrName(sound).ToString(), volume, false, 0, 0, false, false);
        }

        // Xantor 20080528 we should do this differently.
        // 1) apply the sound to the object
        // 2) schedule full update
        // just sending the sound out once doesn't work so well when other avatars come in view later on
        // or when the prim gets moved, changed, sat on, whatever
        // see large number of mantises (mantes?)
        // 20080530 Updated to remove code duplication
        // 20080530 Stop sound if there is one, otherwise volume only changes don't work
        public void llLoopSound(string sound, double volume)
        {
            m_host.AddScriptLPS(1);

            if (m_host.Sound != UUID.Zero)
                llStopSound();

            m_host.Sound = KeyOrName(sound);
            m_host.SoundGain = volume;
            m_host.SoundFlags = 1;      // looping
            m_host.SoundRadius = 20;    // Magic number, 20 seems reasonable. Make configurable?

            m_host.ScheduleFullUpdate();
            m_host.SendFullUpdateToAllClients();
        }

        public void llLoopSoundMaster(string sound, double volume)
        {
            m_host.AddScriptLPS(1);
            m_host.ParentGroup.LoopSoundMasterPrim = m_host;
            lock (m_host.ParentGroup.LoopSoundSlavePrims)
            {
                foreach (SceneObjectPart prim in m_host.ParentGroup.LoopSoundSlavePrims)
                {
                    if (prim.Sound != UUID.Zero)
                        llStopSound();

                    prim.Sound = KeyOrName(sound);
                    prim.SoundGain = volume;
                    prim.SoundFlags = 1;      // looping
                    prim.SoundRadius = 20;    // Magic number, 20 seems reasonable. Make configurable?

                    prim.ScheduleFullUpdate();
                    prim.SendFullUpdateToAllClients();
                }
            }
            if (m_host.Sound != UUID.Zero)
                llStopSound();

            m_host.Sound = KeyOrName(sound);
            m_host.SoundGain = volume;
            m_host.SoundFlags = 1;      // looping
            m_host.SoundRadius = 20;    // Magic number, 20 seems reasonable. Make configurable?

            m_host.ScheduleFullUpdate();
            m_host.SendFullUpdateToAllClients();
        }

        public void llLoopSoundSlave(string sound, double volume)
        {
            m_host.AddScriptLPS(1);
            lock (m_host.ParentGroup.LoopSoundSlavePrims)
            {
                m_host.ParentGroup.LoopSoundSlavePrims.Add(m_host);
            }
        }

        public void llPlaySoundSlave(string sound, double volume)
        {
            m_host.AddScriptLPS(1);

            // send the sound, once, to all clients in range
            m_host.SendSound(KeyOrName(sound).ToString(), volume, false, 0, 0, true, false);
        }

        public void llTriggerSound(string sound, double volume)
        {
            m_host.AddScriptLPS(1);
            // send the sound, once, to all clients in range
            m_host.SendSound(KeyOrName(sound).ToString(), volume, true, 0, 0, false, false);
        }

        // Xantor 20080528: Clear prim data of sound instead
        public void llStopSound()
        {
            m_host.AddScriptLPS(1);
            if (m_host.ParentGroup.LoopSoundSlavePrims.Contains(m_host))
            {
                if (m_host.ParentGroup.LoopSoundMasterPrim == m_host)
                {
                    foreach (SceneObjectPart part in m_host.ParentGroup.LoopSoundSlavePrims)
                    {
                        part.Sound = UUID.Zero;
                        part.SoundGain = 0;
                        part.SoundFlags = 0;
                        part.SoundRadius = 0;
                        part.ScheduleFullUpdate();
                        part.SendFullUpdateToAllClients();
                    }
                    m_host.ParentGroup.LoopSoundMasterPrim = null;
                    m_host.ParentGroup.LoopSoundSlavePrims.Clear();
                }
                else
                {
                    m_host.Sound = UUID.Zero;
                    m_host.SoundGain = 0;
                    m_host.SoundFlags = 0;
                    m_host.SoundRadius = 0;
                    m_host.ScheduleFullUpdate();
                    m_host.SendFullUpdateToAllClients();
                }
            }
            else
            {
                m_host.Sound = UUID.Zero;
                m_host.SoundGain = 0;
                m_host.SoundFlags = 0;
                m_host.SoundRadius = 0;
                m_host.ScheduleFullUpdate();
                m_host.SendFullUpdateToAllClients();
            }
        }

        public void llPreloadSound(string sound)
        {
            m_host.AddScriptLPS(1);
            m_host.PreloadSound(sound);
            ScriptSleep(1000);
        }

        /// <summary>
        /// Return a portion of the designated string bounded by
        /// inclusive indices (start and end). As usual, the negative
        /// indices, and the tolerance for out-of-bound values, makes
        /// this more complicated than it might otherwise seem.
        /// </summary>

        public LSL_String llGetSubString(string src, int start, int end)
        {

            m_host.AddScriptLPS(1);

            // Normalize indices (if negative).
            // After normlaization they may still be
            // negative, but that is now relative to
            // the start, rather than the end, of the
            // sequence.

            if (start < 0)
            {
                start = src.Length+start;
            }
            if (end < 0)
            {
                end = src.Length+end;
            }

            // Conventional substring
            if (start <= end)
            {
                // Implies both bounds are out-of-range.
                if (end < 0 || start >= src.Length)
                {
                    return String.Empty;
                }
                // If end is positive, then it directly
                // corresponds to the lengt of the substring
                // needed (plus one of course). BUT, it
                // must be within bounds.
                if (end >= src.Length)
                {
                    end = src.Length-1;
                }

                if (start < 0)
                {
                    return src.Substring(0,end+1);
                }
                // Both indices are positive
                return src.Substring(start, (end+1) - start);
            }

            // Inverted substring (end < start)
            else
            {
                // Implies both indices are below the
                // lower bound. In the inverted case, that
                // means the entire string will be returned
                // unchanged.
                if (start < 0)
                {
                    return src;
                }
                // If both indices are greater than the upper
                // bound the result may seem initially counter
                // intuitive.
                if (end >= src.Length)
                {
                    return src;
                }

                if (end < 0)
                {
                    if (start < src.Length)
                    {
                        return src.Substring(start);
                    }
                    else
                    {
                        return String.Empty;
                    }
                }
                else
                {
                    if (start < src.Length)
                    {
                        return src.Substring(0,end+1) + src.Substring(start);
                    }
                    else
                    {
                        return src.Substring(0,end+1);
                    }
                }
            }
         }

        /// <summary>
        /// Delete substring removes the specified substring bounded
        /// by the inclusive indices start and end. Indices may be
        /// negative (indicating end-relative) and may be inverted,
        /// i.e. end < start.
        /// </summary>

        public LSL_String llDeleteSubString(string src, int start, int end)
        {

            m_host.AddScriptLPS(1);

            // Normalize indices (if negative).
            // After normlaization they may still be
            // negative, but that is now relative to
            // the start, rather than the end, of the
            // sequence.
            if (start < 0)
            {
                start = src.Length+start;
            }
            if (end < 0)
            {
                end = src.Length+end;
            }
            // Conventionally delimited substring
            if (start <= end)
            {
                // If both bounds are outside of the existing
                // string, then return unchanges.
                if (end < 0 || start >= src.Length)
                {
                    return src;
                }
                // At least one bound is in-range, so we
                // need to clip the out-of-bound argument.
                if (start < 0)
                {
                    start = 0;
                }

                if (end >= src.Length)
                {
                    end = src.Length-1;
                }

                return src.Remove(start,end-start+1);
            }
            // Inverted substring
            else
            {
                // In this case, out of bounds means that
                // the existing string is part of the cut.
                if (start < 0 || end >= src.Length)
                {
                    return String.Empty;
                }

                if (end > 0)
                {
                    if (start < src.Length)
                    {
                        return src.Remove(start).Remove(0,end+1);
                    }
                    else
                    {
                        return src.Remove(0,end+1);
                    }
                }
                else
                {
                    if (start < src.Length)
                    {
                        return src.Remove(start);
                    }
                    else
                    {
                        return src;
                    }
                }
            }
        }

        /// <summary>
        /// Insert string inserts the specified string identified by src
        /// at the index indicated by index. Index may be negative, in
        /// which case it is end-relative. The index may exceed either
        /// string bound, with the result being a concatenation.
        /// </summary>

        public LSL_String llInsertString(string dest, int index, string src)
        {

            m_host.AddScriptLPS(1);

            // Normalize indices (if negative).
            // After normlaization they may still be
            // negative, but that is now relative to
            // the start, rather than the end, of the
            // sequence.
            if (index < 0)
            {
                index = dest.Length+index;

                // Negative now means it is less than the lower
                // bound of the string.

                if (index < 0)
                {
                    return src+dest;
                }

            }

            if (index >= dest.Length)
            {
                return dest+src;
            }

            // The index is in bounds.
            // In this case the index refers to the index that will
            // be assigned to the first character of the inserted string.
            // So unlike the other string operations, we do not add one
            // to get the correct string length.
            return dest.Substring(0,index)+src+dest.Substring(index);

        }

        public LSL_String llToUpper(string src)
        {
            m_host.AddScriptLPS(1);
            return src.ToUpper();
        }

        public LSL_String llToLower(string src)
        {
            m_host.AddScriptLPS(1);
            return src.ToLower();
        }

        public LSL_Integer llGiveMoney(string destination, int amount)
        {
            UUID invItemID=InventorySelf();
            if (invItemID == UUID.Zero)
                return 0;

            m_host.AddScriptLPS(1);

            m_host.TaskInventory.LockItemsForRead(true);
            TaskInventoryItem item = m_host.TaskInventory[invItemID];
            m_host.TaskInventory.LockItemsForRead(false);

            if (item.PermsGranter == UUID.Zero)
                return 0;

            if ((item.PermsMask & ScriptBaseClass.PERMISSION_DEBIT) == 0)
            {
                LSLError("No permissions to give money");
                return 0;
            }

            UUID toID = new UUID();

            if (!UUID.TryParse(destination, out toID))
            {
                LSLError("Bad key in llGiveMoney");
                return 0;
            }

            IMoneyModule money = World.RequestModuleInterface<IMoneyModule>();

            if (money == null)
            {
                NotImplemented("llGiveMoney");
                return 0;
            }

            bool result = money.ObjectGiveMoney(
                m_host.ParentGroup.RootPart.UUID, m_host.ParentGroup.RootPart.OwnerID, toID, amount);

            if (result)
                return 1;

            return 0;
        }

        public void llMakeExplosion(int particles, double scale, double vel, double lifetime, double arc, string texture, LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            Deprecated("llMakeExplosion");
            ScriptSleep(100);
        }

        public void llMakeFountain(int particles, double scale, double vel, double lifetime, double arc, int bounce, string texture, LSL_Vector offset, double bounce_offset)
        {
            m_host.AddScriptLPS(1);
            Deprecated("llMakeFountain");
            ScriptSleep(100);
        }

        public void llMakeSmoke(int particles, double scale, double vel, double lifetime, double arc, string texture, LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            Deprecated("llMakeSmoke");
            ScriptSleep(100);
        }

        public void llMakeFire(int particles, double scale, double vel, double lifetime, double arc, string texture, LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            Deprecated("llMakeFire");
            ScriptSleep(100);
        }

        public void llRezAtRoot(string inventory, LSL_Vector pos, LSL_Vector vel, LSL_Rotation rot, int param)
        {
            m_host.AddScriptLPS(1);

            if (Double.IsNaN(rot.x) || Double.IsNaN(rot.y) || Double.IsNaN(rot.z) || Double.IsNaN(rot.s))
                return;
            float dist = (float)llVecDist(llGetPos(), pos);

            if (dist > m_ScriptDistanceFactor * 10.0f)
                return;

            //Clone is thread-safe
            TaskInventoryDictionary partInventory = (TaskInventoryDictionary)m_host.TaskInventory.Clone();

            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in partInventory)
            {
                if (inv.Value.Name == inventory)
                {
                    // make sure we're an object.
                    if (inv.Value.InvType != (int)InventoryType.Object)
                    {
                        llSay(0, "Unable to create requested object. Object is missing from database.");
                        return;
                    }

                    Vector3 llpos = new Vector3((float)pos.x, (float)pos.y, (float)pos.z);
                    Vector3 llvel = new Vector3((float)vel.x, (float)vel.y, (float)vel.z);

                    // need the magnitude later
                    float velmag = (float)Util.GetMagnitude(llvel);

                    SceneObjectGroup new_group = World.RezObject(m_host, inv.Value, llpos, Rot2Quaternion(rot), llvel, param);

                    // If either of these are null, then there was an unknown error.
                    if (new_group == null)
                        continue;
                    if (new_group.RootPart == null)
                        continue;

                    // objects rezzed with this method are die_at_edge by default.
                    new_group.RootPart.SetDieAtEdge(true);

                    m_ScriptEngine.PostObjectEvent(m_host.LocalId, new EventParams(
                            "object_rez", new Object[] {
                            new LSL_String(
                            new_group.RootPart.UUID.ToString()) },
                            new DetectParams[0]));

                    float groupmass = new_group.GetMass();

                    if (new_group.RootPart.PhysActor != null && new_group.RootPart.PhysActor.IsPhysical && llvel != Vector3.Zero)
                    {
                        //Recoil.
                        llApplyImpulse(new LSL_Vector(llvel.X * groupmass, llvel.Y * groupmass, llvel.Z * groupmass), 0);
                    }
                    // Variable script delay? (see (http://wiki.secondlife.com/wiki/LSL_Delay)
                    ScriptSleep((int)((groupmass * velmag) / 10));
                    ScriptSleep(100);
                    return;
                }
            }

            llSay(0, "Could not find object " + inventory);
        }

        public void llRezObject(string inventory, LSL_Vector pos, LSL_Vector vel, LSL_Rotation rot, int param)
        {
            llRezAtRoot(inventory, pos, vel, rot, param);
        }

        public void llLookAt(LSL_Vector target, double strength, double damping)
        {
            m_host.AddScriptLPS(1);
            // Determine where we are looking from
            LSL_Vector from = llGetPos();

            // Work out the normalised vector from the source to the target
            LSL_Vector delta = llVecNorm(target - from);
            LSL_Vector angle = new LSL_Vector(0,0,0);

            // Calculate the yaw
            // subtracting PI_BY_TWO is required to compensate for the odd SL co-ordinate system
            angle.x = llAtan2(delta.z, delta.y) - ScriptBaseClass.PI_BY_TWO;

            // Calculate pitch
            angle.y = llAtan2(delta.x, llSqrt((delta.y * delta.y) + (delta.z * delta.z)));

            // we need to convert from a vector describing
            // the angles of rotation in radians into rotation value

            LSL_Types.Quaternion rot = llEuler2Rot(angle);
            /*
            Quaternion rotation = new Quaternion((float)rot.x, (float)rot.y, (float)rot.z, (float)rot.s);
            m_host.startLookAt(rotation, (float)damping, (float)strength);
                This would only work if your physics system contains an APID controller */
            // Orient the object to the angle calculated
            llSetRot(rot);
        }
        
        public void llRotLookAt(LSL_Rotation target, double strength, double damping)
        {
            m_host.AddScriptLPS(1);
//            NotImplemented("llRotLookAt");
            m_host.RotLookAt(Rot2Quaternion(target), (float)strength, (float)damping);
            
        }

        public void llStopLookAt()
        {
            m_host.AddScriptLPS(1);
//            NotImplemented("llStopLookAt");
            m_host.StopLookAt();
        }

        public void llSetTimerEvent(double sec)
        {
            if (sec != 0.0 && sec < m_MinTimerInterval)
                sec = m_MinTimerInterval;
            m_host.AddScriptLPS(1);
            // Setting timer repeat
            AsyncCommands.TimerPlugin.SetTimerEvent(m_localID, m_itemID, sec);
        }

        public virtual void llSleep(double sec)
        {
            m_host.AddScriptLPS(1);
            Thread.Sleep((int)(sec * 1000));
        }

        public LSL_Float llGetMass()
        {
            m_host.AddScriptLPS(1);
            return m_host.GetMass();
        }

        public void llCollisionFilter(string name, string id, int accept)
        {
            m_host.AddScriptLPS(1);
            m_host.CollisionFilter.Clear();
            if (id != null)
            {
                m_host.CollisionFilter.Add(accept,id);
            }
            else
            {
                m_host.CollisionFilter.Add(accept,name);
            }
        }

        public void llTakeControls(int controls, int accept, int pass_on)
        {
            TaskInventoryItem item;

            m_host.TaskInventory.LockItemsForRead(true);
            if (!m_host.TaskInventory.ContainsKey(InventorySelf()))
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            else
            {
                item = m_host.TaskInventory[InventorySelf()];
            }
            m_host.TaskInventory.LockItemsForRead(false);

            if (item.PermsGranter != UUID.Zero)
            {
                ScenePresence presence = World.GetScenePresence(item.PermsGranter);

                if (presence != null)
                {
                    if ((item.PermsMask & ScriptBaseClass.PERMISSION_TAKE_CONTROLS) != 0)
                    {
                        presence.RegisterControlEventsToScript(controls, accept, pass_on, m_localID, m_itemID);
                    }
                }
            }

            m_host.AddScriptLPS(1);
        }

        public void llReleaseControls()
        {
            TaskInventoryItem item;

            m_host.TaskInventory.LockItemsForRead(true);
            lock (m_host.TaskInventory)
            {
                
                if (!m_host.TaskInventory.ContainsKey(InventorySelf()))
                {
                    m_host.TaskInventory.LockItemsForRead(false);
                    return;
                }
                else
                {
                    item = m_host.TaskInventory[InventorySelf()];
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            m_host.AddScriptLPS(1);

            if (item.PermsGranter != UUID.Zero)
            {
                ScenePresence presence = World.GetScenePresence(item.PermsGranter);

                if (presence != null)
                {
                    if ((item.PermsMask & ScriptBaseClass.PERMISSION_TAKE_CONTROLS) != 0)
                    {
                        // Unregister controls from Presence
                        presence.UnRegisterControlEventsToScript(m_localID, m_itemID);
                        // Remove Take Control permission.
                        item.PermsMask &= ~ScriptBaseClass.PERMISSION_TAKE_CONTROLS;
                    }
                }
            }
        }

        public void llReleaseURL(string url)
        {
            m_host.AddScriptLPS(1);
            if (m_UrlModule != null)
                m_UrlModule.ReleaseURL(url);
        }

        public void llAttachToAvatar(int attachment)
        {
            m_host.AddScriptLPS(1);

            if (m_host.ParentGroup.RootPart.AttachmentPoint == 0)
                return;

            TaskInventoryItem item;

            m_host.TaskInventory.LockItemsForRead(true);

            if (!m_host.TaskInventory.ContainsKey(InventorySelf()))
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            else
            {
                item = m_host.TaskInventory[InventorySelf()];
            }

            m_host.TaskInventory.LockItemsForRead(false);

            if (item.PermsGranter != m_host.OwnerID)
                return;

            if ((item.PermsMask & ScriptBaseClass.PERMISSION_ATTACH) != 0)
            {
                SceneObjectGroup grp = m_host.ParentGroup;

                ScenePresence presence = World.GetScenePresence(m_host.OwnerID);

                m_ScriptEngine.World.AttachObject(presence.ControllingClient,
                        grp.LocalId, (uint)attachment, Quaternion.Identity,
                        Vector3.Zero, false);
            }
        }

        public void llDetachFromAvatar()
        {
            m_host.AddScriptLPS(1);

            if (m_host.ParentGroup.RootPart.AttachmentPoint == 0)
                return;

            TaskInventoryItem item;

            m_host.TaskInventory.LockItemsForRead(true);

            if (!m_host.TaskInventory.ContainsKey(InventorySelf()))
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            else
            {
                item = m_host.TaskInventory[InventorySelf()];
            }
            m_host.TaskInventory.LockItemsForRead(false);


            if (item.PermsGranter != m_host.OwnerID)
                return;

            if ((item.PermsMask & ScriptBaseClass.PERMISSION_ATTACH) != 0)
            {
                SceneObjectGroup grp = m_host.ParentGroup;
                UUID itemID = grp.GetFromItemID();

                ScenePresence presence = World.GetScenePresence(m_host.OwnerID);

                m_ScriptEngine.World.DetachSingleAttachmentToInv(itemID,
                        presence.ControllingClient);
            }
        }

        public void llTakeCamera(string avatar)
        {
            m_host.AddScriptLPS(1);
            Deprecated("llTakeCamera");
        }

        public void llReleaseCamera(string avatar)
        {
            m_host.AddScriptLPS(1);
            Deprecated("llReleaseCamera");
        }

        public LSL_String llGetOwner()
        {
            m_host.AddScriptLPS(1);

            return m_host.OwnerID.ToString();
        }

        [DebuggerNonUserCode]
        public void llInstantMessage(string user, string message)
        {
            UUID result;
            if (!UUID.TryParse(user, out result))
            {
                throw new Exception(String.Format("An invalid key of '{0} was passed to llInstantMessage", user));
                return;
            }
            

            m_host.AddScriptLPS(1);

            // We may be able to use ClientView.SendInstantMessage here, but we need a client instance.
            // InstantMessageModule.OnInstantMessage searches through a list of scenes for a client matching the toAgent,
            // but I don't think we have a list of scenes available from here.
            // (We also don't want to duplicate the code in OnInstantMessage if we can avoid it.)

            // user is a UUID

            // TODO: figure out values for client, fromSession, and imSessionID
            // client.SendInstantMessage(m_host.UUID, fromSession, message, user, imSessionID, m_host.Name, AgentManager.InstantMessageDialog.MessageFromAgent, (uint)Util.UnixTimeSinceEpoch());
            UUID friendTransactionID = UUID.Random();

            //m_pendingFriendRequests.Add(friendTransactionID, fromAgentID);
            
            GridInstantMessage msg = new GridInstantMessage();
            msg.fromAgentID = new Guid(m_host.UUID.ToString()); // fromAgentID.Guid;
            msg.toAgentID = new Guid(user); // toAgentID.Guid;
            msg.imSessionID = new Guid(friendTransactionID.ToString()); // This is the item we're mucking with here
//            m_log.Debug("[Scripting IM]: From:" + msg.fromAgentID.ToString() + " To: " + msg.toAgentID.ToString() + " Session:" + msg.imSessionID.ToString() + " Message:" + message);
//            m_log.Debug("[Scripting IM]: Filling Session: " + msg.imSessionID.ToString());
            msg.timestamp = (uint)Util.UnixTimeSinceEpoch();// timestamp;
            //if (client != null)
            //{
                msg.fromAgentName = m_host.Name;//client.FirstName + " " + client.LastName;// fromAgentName;
            //}
            //else
            //{
            //    msg.fromAgentName = "(hippos)";// Added for posterity.  This means that we can't figure out who sent it
            //}
            // Cap the message length at 1024.
            if (message != null && message.Length > 1024)
                msg.message = message.Substring(0, 1024);
            else
                msg.message = message;
            msg.dialog = (byte)19; // messgage from script ??? // dialog;
            msg.fromGroup = false;// fromGroup;
            msg.offline = (byte)0; //offline;
            msg.ParentEstateID = 0; //ParentEstateID;
            msg.Position = Vector3.Zero;// new Vector3(m_host.AbsolutePosition);
            msg.RegionID = World.RegionInfo.RegionID.Guid;//RegionID.Guid;
            msg.binaryBucket = new byte[0];// binaryBucket;

            if (m_TransferModule != null)
            {
                m_TransferModule.SendInstantMessage(msg, delegate(bool success) {});
            }
            ScriptSleep(2000);
      }

        public void llEmail(string address, string subject, string message)
        {
            m_host.AddScriptLPS(1);
            IEmailModule emailModule = m_ScriptEngine.World.RequestModuleInterface<IEmailModule>();
            if (emailModule == null)
            {
                ShoutError("llEmail: email module not configured");
                return;
            }

            emailModule.SendEmail(m_host.UUID, address, subject, message);
            ScriptSleep(20000);
        }

        public void llGetNextEmail(string address, string subject)
        {
            m_host.AddScriptLPS(1);
            IEmailModule emailModule = m_ScriptEngine.World.RequestModuleInterface<IEmailModule>();
            if (emailModule == null)
            {
                ShoutError("llGetNextEmail: email module not configured");
                return;
            }
            Email email;

            email = emailModule.GetNextEmail(m_host.UUID, address, subject);

            if (email == null)
                return;

            m_ScriptEngine.PostObjectEvent(m_host.LocalId,
                    new EventParams("email",
                    new Object[] {
                        new LSL_String(email.time),
                        new LSL_String(email.sender),
                        new LSL_String(email.subject),
                        new LSL_String(email.message),
                        new LSL_Integer(email.numLeft)},
                    new DetectParams[0]));

        }

        public LSL_String llGetKey()
        {
            m_host.AddScriptLPS(1);
            return m_host.UUID.ToString();
        }

        public void llSetBuoyancy(double buoyancy)
        {
            m_host.AddScriptLPS(1);
            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    m_host.ParentGroup.RootPart.SetBuoyancy((float)buoyancy);
                }
            }
        }

        /// <summary>
        /// Attempt to clamp the object on the Z axis at the given height over tau seconds.
        /// </summary>
        /// <param name="height">Height to hover.  Height of zero disables hover.</param>
        /// <param name="water">False if height is calculated just from ground, otherwise uses ground or water depending on whichever is higher</param>
        /// <param name="tau">Number of seconds over which to reach target</param>
        public void llSetHoverHeight(double height, int water, double tau)
        {
            m_host.AddScriptLPS(1);
            if (m_host.PhysActor != null)
            {
                PIDHoverType hoverType = PIDHoverType.Ground;
                if (water != 0)
                {
                    hoverType = PIDHoverType.GroundAndWater;
                }

                m_host.SetHoverHeight((float)height, hoverType, (float)tau);
            }
        }

        public void llStopHover()
        {
            m_host.AddScriptLPS(1);
            if (m_host.PhysActor != null)
            {
                m_host.SetHoverHeight(0f, PIDHoverType.Ground, 0f);
            }
        }

        public void llMinEventDelay(double delay)
        {
            m_host.AddScriptLPS(1);
            try
            {
                m_ScriptEngine.SetMinEventDelay(m_itemID, delay);
            }
            catch (NotImplementedException)
            {
                // Currently not implemented in DotNetEngine only XEngine
                NotImplemented("llMinEventDelay in DotNetEngine");
            }
        }

        /// <summary>
        /// llSoundPreload is deprecated. In SL this appears to do absolutely nothing
        /// and is documented to have no delay.
        /// </summary>
        public void llSoundPreload(string sound)
        {
            m_host.AddScriptLPS(1);
        }

        public LSL_Integer llStringLength(string str)
        {
            m_host.AddScriptLPS(1);
            if (str.Length > 0)
            {
                return str.Length;
            }
            else
            {
                return 0;
            }
        }

        public void llStartAnimation(string anim)
        {
            m_host.AddScriptLPS(1);

            UUID invItemID = InventorySelf();
            if (invItemID == UUID.Zero)
                return;

            TaskInventoryItem item;

            m_host.TaskInventory.LockItemsForRead(true);
            if (!m_host.TaskInventory.ContainsKey(InventorySelf()))
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            else
            {
                item = m_host.TaskInventory[InventorySelf()];
            }
            m_host.TaskInventory.LockItemsForRead(false);
            if (item.PermsGranter == UUID.Zero)
                return;

            if ((item.PermsMask & ScriptBaseClass.PERMISSION_TRIGGER_ANIMATION) != 0)
            {
                ScenePresence presence = World.GetScenePresence(item.PermsGranter);

                if (presence != null)
                {
                    // Do NOT try to parse UUID, animations cannot be triggered by ID
                    UUID animID = InventoryKey(anim, (int)AssetType.Animation);
                    if (animID == UUID.Zero)
                        presence.Animator.AddAnimation(anim, m_host.UUID);
                    else
                        presence.Animator.AddAnimation(animID, m_host.UUID);
                }
            }
        }

        public void llStopAnimation(string anim)
        {
            m_host.AddScriptLPS(1);

            UUID invItemID=InventorySelf();
            if (invItemID == UUID.Zero)
                return;

            TaskInventoryItem item;

            m_host.TaskInventory.LockItemsForRead(true);
            if (!m_host.TaskInventory.ContainsKey(InventorySelf()))
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            else
            {
                item = m_host.TaskInventory[InventorySelf()];
            }
            m_host.TaskInventory.LockItemsForRead(false);
            

            if (item.PermsGranter == UUID.Zero)
                return;

            if ((item.PermsMask & ScriptBaseClass.PERMISSION_TRIGGER_ANIMATION) != 0)
            {
                UUID animID = new UUID();

                if (!UUID.TryParse(anim, out animID))
                {
                    animID=InventoryKey(anim);
                }

                ScenePresence presence = World.GetScenePresence(item.PermsGranter);

                if (presence != null)
                {
                    if (animID == UUID.Zero)
                        presence.Animator.RemoveAnimation(anim);
                    else
                        presence.Animator.RemoveAnimation(animID);
                }
            }
        }

        public void llPointAt(LSL_Vector pos)
        {
            m_host.AddScriptLPS(1);
            ScenePresence Owner = World.GetScenePresence(m_host.UUID);
            LSL_Rotation rot = llEuler2Rot(pos);
            Owner.PreviousRotation = Owner.Rotation;
            Owner.Rotation = (new Quaternion((float)rot.x,(float)rot.y,(float)rot.z,(float)rot.s));
        }

        public void llStopPointAt()
        {
            m_host.AddScriptLPS(1);
            ScenePresence Owner = m_host.ParentGroup.Scene.GetScenePresence(m_host.OwnerID);
            Owner.Rotation = Owner.PreviousRotation;
        }

        public void llTargetOmega(LSL_Vector axis, double spinrate, double gain)
        {
            m_host.AddScriptLPS(1);
            m_host.AngularVelocity = new Vector3((float)(axis.x * spinrate), (float)(axis.y * spinrate), (float)(axis.z * spinrate));
            m_host.ScheduleTerseUpdate();
            m_host.SendTerseUpdateToAllClients();
            m_host.ParentGroup.HasGroupChanged = true;
        }

        public LSL_Integer llGetStartParameter()
        {
            m_host.AddScriptLPS(1);
            return m_ScriptEngine.GetStartParameter(m_itemID);
        }

        public void llGodLikeRezObject(string inventory, LSL_Vector pos)
        {
            m_host.AddScriptLPS(1);
            NotImplemented("llGodLikeRezObject");
        }

        public void llRequestPermissions(string agent, int perm)
        {
            UUID agentID = new UUID();

            if (!UUID.TryParse(agent, out agentID))
                return;

            UUID invItemID = InventorySelf();

            if (invItemID == UUID.Zero)
                return; // Not in a prim? How??

            TaskInventoryItem item;


            m_host.TaskInventory.LockItemsForRead(true);
            if (!m_host.TaskInventory.ContainsKey(invItemID))
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            else
            {
                item = m_host.TaskInventory[invItemID];
            }
            m_host.TaskInventory.LockItemsForRead(false);

            if (agentID == UUID.Zero || perm == 0) // Releasing permissions
            {
                llReleaseControls();

                item.PermsGranter = UUID.Zero;
                item.PermsMask = 0;

                m_ScriptEngine.PostScriptEvent(m_itemID, new EventParams(
                        "run_time_permissions", new Object[] {
                        new LSL_Integer(0) },
                        new DetectParams[0]));

                return;
            }

            if (item.PermsGranter != agentID || (perm & ScriptBaseClass.PERMISSION_TAKE_CONTROLS) == 0)
                llReleaseControls();

            m_host.AddScriptLPS(1);

            if (m_host.ParentGroup.IsAttachment && (UUID)agent == m_host.ParentGroup.RootPart.AttachedAvatar)
            {
                // When attached, certain permissions are implicit if requested from owner
                int implicitPerms = ScriptBaseClass.PERMISSION_TAKE_CONTROLS |
                        ScriptBaseClass.PERMISSION_TRIGGER_ANIMATION |
                        ScriptBaseClass.PERMISSION_CONTROL_CAMERA |
                        ScriptBaseClass.PERMISSION_ATTACH;

                if ((perm & (~implicitPerms)) == 0) // Requested only implicit perms
                {
                    m_host.TaskInventory.LockItemsForWrite(true);
                    m_host.TaskInventory[invItemID].PermsGranter = agentID;
                    m_host.TaskInventory[invItemID].PermsMask = perm;
                    m_host.TaskInventory.LockItemsForWrite(false);

                    m_ScriptEngine.PostScriptEvent(m_itemID, new EventParams(
                            "run_time_permissions", new Object[] {
                            new LSL_Integer(perm) },
                            new DetectParams[0]));

                    return;
                }
            }
            else if (m_host.SitTargetAvatar == agentID) // Sitting avatar
            {
                // When agent is sitting, certain permissions are implicit if requested from sitting agent
                int implicitPerms = ScriptBaseClass.PERMISSION_TRIGGER_ANIMATION |
                    ScriptBaseClass.PERMISSION_CONTROL_CAMERA |
                    ScriptBaseClass.PERMISSION_TRACK_CAMERA |
                    ScriptBaseClass.PERMISSION_TAKE_CONTROLS;

                if ((perm & (~implicitPerms)) == 0) // Requested only implicit perms
                {
                    m_host.TaskInventory.LockItemsForWrite(true);
                    m_host.TaskInventory[invItemID].PermsGranter = agentID;
                    m_host.TaskInventory[invItemID].PermsMask = perm;
                    m_host.TaskInventory.LockItemsForWrite(false);

                    m_ScriptEngine.PostScriptEvent(m_itemID, new EventParams(
                            "run_time_permissions", new Object[] {
                            new LSL_Integer(perm) },
                            new DetectParams[0]));

                    return;
                }
            }

            ScenePresence presence = World.GetScenePresence(agentID);

            if (presence != null)
            {
                string ownerName = resolveName(m_host.ParentGroup.RootPart.OwnerID);
                if (ownerName == String.Empty)
                    ownerName = "(hippos)";

                if (!m_waitingForScriptAnswer)
                {
                    m_host.TaskInventory.LockItemsForWrite(true);
                    m_host.TaskInventory[invItemID].PermsGranter = agentID;
                    m_host.TaskInventory[invItemID].PermsMask = 0;
                    m_host.TaskInventory.LockItemsForWrite(false);

                    presence.ControllingClient.OnScriptAnswer += handleScriptAnswer;
                    m_waitingForScriptAnswer=true;
                }

                presence.ControllingClient.SendScriptQuestion(
                    m_host.UUID, m_host.ParentGroup.RootPart.Name, ownerName, invItemID, perm);

                return;
            }

            // Requested agent is not in range, refuse perms
            m_ScriptEngine.PostScriptEvent(m_itemID, new EventParams(
                    "run_time_permissions", new Object[] {
                    new LSL_Integer(0) },
                    new DetectParams[0]));
        }

        void handleScriptAnswer(IClientAPI client, UUID taskID, UUID itemID, int answer)
        {
            if (taskID != m_host.UUID)
                return;

            UUID invItemID = InventorySelf();

            if (invItemID == UUID.Zero)
                return;

            client.OnScriptAnswer-=handleScriptAnswer;
            m_waitingForScriptAnswer=false;

            if ((answer & ScriptBaseClass.PERMISSION_TAKE_CONTROLS) == 0)
                llReleaseControls();

            
            m_host.TaskInventory.LockItemsForWrite(true);
            m_host.TaskInventory[invItemID].PermsMask = answer;
            m_host.TaskInventory.LockItemsForWrite(false);
            

            m_ScriptEngine.PostScriptEvent(m_itemID, new EventParams(
                    "run_time_permissions", new Object[] {
                    new LSL_Integer(answer) },
                    new DetectParams[0]));
        }

        public LSL_String llGetPermissionsKey()
        {
            m_host.AddScriptLPS(1);

            m_host.TaskInventory.LockItemsForRead(true);
            
            foreach (TaskInventoryItem item in m_host.TaskInventory.Values)
            {
                if (item.Type == 10 && item.ItemID == m_itemID)
                {
                    m_host.TaskInventory.LockItemsForRead(false);
                    return item.PermsGranter.ToString();
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            return UUID.Zero.ToString();
        }

        public LSL_Integer llGetPermissions()
        {
            m_host.AddScriptLPS(1);

            m_host.TaskInventory.LockItemsForRead(true);

            foreach (TaskInventoryItem item in m_host.TaskInventory.Values)
            {
                if (item.Type == 10 && item.ItemID == m_itemID)
                {
                    int perms = item.PermsMask;
                    if (m_automaticLinkPermission)
                        perms |= ScriptBaseClass.PERMISSION_CHANGE_LINKS;
                    m_host.TaskInventory.LockItemsForRead(false);
                    return perms;
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            return 0;
        }

        public LSL_Integer llGetLinkNumber()
        {
            m_host.AddScriptLPS(1);

            if (m_host.ParentGroup.Children.Count > 1)
            {
                return m_host.LinkNum;
            }
            else
            {
                return 0;
            }
        }

        public void llSetLinkColor(int linknumber, LSL_Vector color, int face)
        {
            List<SceneObjectPart> parts = GetLinkParts(linknumber);

            foreach (SceneObjectPart part in parts)
                part.SetFaceColor(new Vector3((float)color.x, (float)color.y, (float)color.z), face);
        }

        public void llCreateLink(string target, int parent)
        {
            m_host.AddScriptLPS(1);
            UUID invItemID = InventorySelf();

            TaskInventoryItem item;
            m_host.TaskInventory.LockItemsForRead(true);
            item = m_host.TaskInventory[invItemID];
            m_host.TaskInventory.LockItemsForRead(false);
             
            if ((item.PermsMask & ScriptBaseClass.PERMISSION_CHANGE_LINKS) == 0
                && !m_automaticLinkPermission)
            {
                ShoutError("Script trying to link but PERMISSION_CHANGE_LINKS permission not set!");
                return;
            }

            IClientAPI client = null;
            ScenePresence sp = World.GetScenePresence(item.PermsGranter);
            if (sp != null)
                client = sp.ControllingClient;

            SceneObjectPart targetPart = World.GetSceneObjectPart((UUID)target);

            if (targetPart.ParentGroup.RootPart.AttachmentPoint != 0)
                return; // Fail silently if attached
            SceneObjectGroup parentPrim = null, childPrim = null;

            if (targetPart != null)
            {
                if (parent != 0) {
                    parentPrim = m_host.ParentGroup;
                    childPrim = targetPart.ParentGroup;
                }
                else
                {
                    parentPrim = targetPart.ParentGroup;
                    childPrim = m_host.ParentGroup;
                }
//                byte uf = childPrim.RootPart.UpdateFlag;
                childPrim.RootPart.UpdateFlag = 0;
                parentPrim.LinkToGroup(childPrim);
//                if (uf != (Byte)0)
//                    parent.RootPart.UpdateFlag = uf;
            }

            parentPrim.TriggerScriptChangedEvent(Changed.LINK);
            parentPrim.RootPart.AddFlag(PrimFlags.CreateSelected);
            parentPrim.HasGroupChanged = true;
            parentPrim.ScheduleGroupForFullUpdate();

            if (client != null)
                parentPrim.GetProperties(client);

            ScriptSleep(1000);
        }

        public void llBreakLink(int linknum)
        {
            m_host.AddScriptLPS(1);
            UUID invItemID = InventorySelf();

            m_host.TaskInventory.LockItemsForRead(true);
                if ((m_host.TaskInventory[invItemID].PermsMask & ScriptBaseClass.PERMISSION_CHANGE_LINKS) == 0
                    && !m_automaticLinkPermission)
                {
                    ShoutError("Script trying to link but PERMISSION_CHANGE_LINKS permission not set!");
                    m_host.TaskInventory.LockItemsForRead(false);
                    return;
                }
            m_host.TaskInventory.LockItemsForRead(false);
            
            if (linknum < ScriptBaseClass.LINK_THIS)
                return;

            SceneObjectGroup parentPrim = m_host.ParentGroup;

            if (parentPrim.RootPart.AttachmentPoint != 0)
                return; // Fail silently if attached
            SceneObjectPart childPrim = null;

            switch (linknum)
            {
                case ScriptBaseClass.LINK_ROOT:
                    break;
                case ScriptBaseClass.LINK_SET:
                case ScriptBaseClass.LINK_ALL_OTHERS:
                case ScriptBaseClass.LINK_ALL_CHILDREN:
                case ScriptBaseClass.LINK_THIS:
                    foreach (SceneObjectPart part in parentPrim.Children.Values)
                    {
                        if (part.UUID != m_host.UUID)
                        {
                            childPrim = part;
                            break;
                        }
                    }
                    break;
                default:
                    childPrim = parentPrim.GetLinkNumPart(linknum);
                    if (childPrim.UUID == m_host.UUID)
                        childPrim = null;
                    break;
            }

            if (linknum == ScriptBaseClass.LINK_ROOT)
            {
                // Restructuring Multiple Prims.
                List<SceneObjectPart> parts = new List<SceneObjectPart>(parentPrim.Children.Values);
                parts.Remove(parentPrim.RootPart);
                foreach (SceneObjectPart part in parts)
                {
                    parentPrim.DelinkFromGroup(part.LocalId, true);
                }
                parentPrim.HasGroupChanged = true;
                parentPrim.ScheduleGroupForFullUpdate();
                parentPrim.TriggerScriptChangedEvent(Changed.LINK);

                if (parts.Count > 0)
                {
                    SceneObjectPart newRoot = parts[0];
                    parts.Remove(newRoot);
                    foreach (SceneObjectPart part in parts)
                    {
                        part.UpdateFlag = 0;
                        newRoot.ParentGroup.LinkToGroup(part.ParentGroup);
                    }
                    newRoot.ParentGroup.HasGroupChanged = true;
                    newRoot.ParentGroup.ScheduleGroupForFullUpdate();
                }
            }
            else
            {
                if (childPrim == null)
                    return;

                parentPrim.DelinkFromGroup(childPrim.LocalId, true);
                parentPrim.HasGroupChanged = true;
                parentPrim.ScheduleGroupForFullUpdate();
                parentPrim.TriggerScriptChangedEvent(Changed.LINK);
            }
        }

        public void llBreakAllLinks()
        {
            m_host.AddScriptLPS(1);
            SceneObjectGroup parentPrim = m_host.ParentGroup;
            if (parentPrim.RootPart.AttachmentPoint != 0)
                return; // Fail silently if attached

            List<SceneObjectPart> parts = new List<SceneObjectPart>(parentPrim.Children.Values);
            parts.Remove(parentPrim.RootPart);

            foreach (SceneObjectPart part in parts)
            {
                parentPrim.DelinkFromGroup(part.LocalId, true);
                parentPrim.TriggerScriptChangedEvent(Changed.LINK);
            }
            parentPrim.HasGroupChanged = true;
            parentPrim.ScheduleGroupForFullUpdate();
        }

        public LSL_String llGetLinkKey(int linknum)
        {
            m_host.AddScriptLPS(1);
            SceneObjectPart part = m_host.ParentGroup.GetLinkNumPart(linknum);
            if (part != null)
            {
                return part.UUID.ToString();
            }
            else
            {
                return UUID.Zero.ToString();
            }
        }

        /// <summary>
        /// The rules governing the returned name are not simple. The only
        /// time a blank name is returned is if the target prim has a blank
        /// name. If no prim with the given link number can be found then
        /// usually NULL_KEY is returned but there are exceptions.
        ///
        /// In a single unlinked prim, A call with 0 returns the name, all
        /// other values for link number return NULL_KEY
        ///
        /// In link sets it is more complicated.
        ///
        /// If the script is in the root prim:-
        ///     A zero link number returns NULL_KEY.
        ///     Positive link numbers return the name of the prim, or NULL_KEY
        ///     if a prim does not exist at that position.
        ///     Negative link numbers return the name of the first child prim.
        ///
        /// If the script is in a child prim:-
        ///     Link numbers 0 or 1 return the name of the root prim.
        ///     Positive link numbers return the name of the prim or NULL_KEY
        ///     if a prim does not exist at that position.
        ///     Negative numbers return the name of the root prim.
        ///
        /// References
        /// http://lslwiki.net/lslwiki/wakka.php?wakka=llGetLinkName
        /// Mentions NULL_KEY being returned
        /// http://wiki.secondlife.com/wiki/LlGetLinkName
        /// Mentions using the LINK_* constants, some of which are negative
        /// </summary>
        public LSL_String llGetLinkName(int linknum)
        {
            m_host.AddScriptLPS(1);

            // simplest case, this prims link number
            if (m_host.LinkNum == linknum)
                return m_host.Name;

            // Single prim
            if (m_host.LinkNum == 0)
            {
                if (linknum == 0)
                    return m_host.Name;
                else
                    return UUID.Zero.ToString();
            }
            // Link set
            SceneObjectPart part = null;
            if (m_host.LinkNum == 1) // this is the Root prim
            {
                if (linknum < 0)
                    part = m_host.ParentGroup.GetLinkNumPart(2);
                else
                    part = m_host.ParentGroup.GetLinkNumPart(linknum);
            }
            else // this is a child prim
            {
                if (linknum < 2)
                    part = m_host.ParentGroup.GetLinkNumPart(1);
                else
                    part = m_host.ParentGroup.GetLinkNumPart(linknum);
            }
            if (part != null)
                return part.Name;
            else
                return UUID.Zero.ToString();
        }

        public LSL_Integer llGetInventoryNumber(int type)
        {
            m_host.AddScriptLPS(1);
            int count = 0;

            m_host.TaskInventory.LockItemsForRead(true);
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Type == type || type == -1)
                {
                    count = count + 1;
                }
            }
            
            m_host.TaskInventory.LockItemsForRead(false);
            return count;
        }

        public LSL_String llGetInventoryName(int type, int number)
        {
            m_host.AddScriptLPS(1);
            ArrayList keys = new ArrayList();

            m_host.TaskInventory.LockItemsForRead(true);
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Type == type || type == -1)
                {
                    keys.Add(inv.Value.Name);
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            if (keys.Count == 0)
            {
                return String.Empty;
            }
            keys.Sort();
            if (keys.Count > number)
            {
                return (string)keys[number];
            }
            return String.Empty;
        }

        public LSL_Float llGetEnergy()
        {
            m_host.AddScriptLPS(1);
            // TODO: figure out real energy value
            return 1.0f;
        }

        public void llGiveInventory(string destination, string inventory)
        {
            m_host.AddScriptLPS(1);
            bool found = false;
            UUID destId = UUID.Zero;
            UUID objId = UUID.Zero;
            int assetType = 0;
            string objName = String.Empty;

            if (!UUID.TryParse(destination, out destId))
            {
                llSay(0, "Could not parse key " + destination);
                return;
            }

            // move the first object found with this inventory name
            m_host.TaskInventory.LockItemsForRead(true);
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Name == inventory)
                {
                    found = true;
                    objId = inv.Key;
                    assetType = inv.Value.Type;
                    objName = inv.Value.Name;
                    break;
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            if (!found)
            {
                llSay(0, String.Format("Could not find object '{0}'", inventory));
                throw new Exception(String.Format("The inventory object '{0}' could not be found", inventory));
            }

            // check if destination is an avatar
            if (World.GetScenePresence(destId) != null)
            {
                // destination is an avatar
                InventoryItemBase agentItem =
                        World.MoveTaskInventoryItem(destId, UUID.Zero, m_host, objId);

                if (agentItem == null)
                    return;

                byte[] bucket = new byte[17];
                bucket[0] = (byte)assetType;
                byte[] objBytes = objId.GetBytes();
                Array.Copy(objBytes, 0, bucket, 1, 16);

                Console.WriteLine("Giving inventory");
                GridInstantMessage msg = new GridInstantMessage(World,
                        m_host.UUID, m_host.Name+", an object owned by "+
                        resolveName(m_host.OwnerID)+",", destId,
                        (byte)InstantMessageDialog.InventoryOffered,
                        false, objName+"\n"+m_host.Name+" is located at "+
                        World.RegionInfo.RegionName+" "+
                        m_host.AbsolutePosition.ToString(),
                        agentItem.ID, true, m_host.AbsolutePosition,
                        bucket);

                if (m_TransferModule != null)
                    m_TransferModule.SendInstantMessage(msg, delegate(bool success) {});
                
                //This delay should only occur when giving inventory to avatars.
                ScriptSleep(3000);
            }
            else
            {
                // destination is an object
                World.MoveTaskInventoryItem(destId, m_host, objId);
            }
            
        }

        [DebuggerNonUserCode]
        public void llRemoveInventory(string name)
        {
            m_host.AddScriptLPS(1);

            m_host.TaskInventory.LockItemsForRead(true);
            foreach (TaskInventoryItem item in m_host.TaskInventory.Values)
            {
                if (item.Name == name)
                {
                    if (item.ItemID == m_itemID)
                        throw new ScriptDeleteException();
                    else
                        m_host.Inventory.RemoveInventoryItem(item.ItemID);

                    m_host.TaskInventory.LockItemsForRead(false);
                    return;
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);
        }

        public void llSetText(string text, LSL_Vector color, double alpha)
        {
            m_host.AddScriptLPS(1);
            Vector3 av3 = new Vector3(Util.Clip((float)color.x, 0.0f, 1.0f),
                                      Util.Clip((float)color.y, 0.0f, 1.0f),
                                      Util.Clip((float)color.z, 0.0f, 1.0f));
            m_host.SetText(text, av3, Util.Clip((float)alpha, 0.0f, 1.0f));
            m_host.ParentGroup.HasGroupChanged = true;
            m_host.ParentGroup.ScheduleGroupForFullUpdate();
        }

        public LSL_Float llWater(LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            return World.RegionInfo.RegionSettings.WaterHeight;
        }

        public void llPassTouches(int pass)
        {
            m_host.AddScriptLPS(1);
            if (pass != 0)
                m_host.PassTouches = true;
            else
                m_host.PassTouches = false;
        }

        public LSL_String llRequestAgentData(string id, int data)
        {
            m_host.AddScriptLPS(1);

            UUID uuid = (UUID)id;

            UserProfileData userProfile =
                    World.CommsManager.UserService.GetUserProfile(uuid);

            UserAgentData userAgent =
                    World.CommsManager.UserService.GetAgentByUUID(uuid);

            if (userProfile == null || userAgent == null)
                return UUID.Zero.ToString();

            string reply = String.Empty;

            switch (data)
            {
            case 1: // DATA_ONLINE (0|1)
                // TODO: implement fetching of this information
                if (userProfile.CurrentAgent!=null && userProfile.CurrentAgent.AgentOnline)
                    reply = "1";
                else
                    reply = "0";
                break;
            case 2: // DATA_NAME (First Last)
                reply = userProfile.FirstName + " " + userProfile.SurName;
                break;
            case 3: // DATA_BORN (YYYY-MM-DD)
                DateTime born = new DateTime(1970, 1, 1, 0, 0, 0, 0);
                born = born.AddSeconds(userProfile.Created);
                reply = born.ToString("yyyy-MM-dd");
                break;
            case 4: // DATA_RATING (0,0,0,0,0,0)
                reply = "0,0,0,0,0,0";
                break;
            case 8: // DATA_PAYINFO (0|1|2|3)
                reply = "0";
                break;
            default:
                return UUID.Zero.ToString(); // Raise no event
            }

            UUID rq = UUID.Random();

            UUID tid = AsyncCommands.
                DataserverPlugin.RegisterRequest(m_localID,
                                             m_itemID, rq.ToString());

            AsyncCommands.
            DataserverPlugin.DataserverReply(rq.ToString(), reply);

            ScriptSleep(100);
            return tid.ToString();
        }

        public LSL_String llRequestInventoryData(string name)
        {
            m_host.AddScriptLPS(1);

            //Clone is thread safe
            TaskInventoryDictionary itemDictionary = (TaskInventoryDictionary)m_host.TaskInventory.Clone();

            foreach (TaskInventoryItem item in itemDictionary.Values)
            {
                if (item.Type == 3 && item.Name == name)
                {
                    UUID tid = AsyncCommands.
                        DataserverPlugin.RegisterRequest(m_localID,
                                                     m_itemID, item.AssetID.ToString());

                    Vector3 region = new Vector3(
                        World.RegionInfo.RegionLocX * Constants.RegionSize,
                        World.RegionInfo.RegionLocY * Constants.RegionSize,
                        0);

                    World.AssetService.Get(item.AssetID.ToString(), this,
                        delegate(string i, object sender, AssetBase a)
                        {
                            AssetLandmark lm = new AssetLandmark(a);

                            float rx = (uint)(lm.RegionHandle >> 32);
                            float ry = (uint)lm.RegionHandle;
                            region = lm.Position + new Vector3(rx, ry, 0) - region;

                            string reply = region.ToString();
                            AsyncCommands.
                                DataserverPlugin.DataserverReply(i.ToString(),
                                                             reply);
                        });

                    ScriptSleep(1000);
                    return tid.ToString();
                }
            }
            ScriptSleep(1000);
            return String.Empty;
        }

        public void llSetDamage(double damage)
        {
            m_host.AddScriptLPS(1);
            m_host.ParentGroup.Damage = (float)damage;
        }

        public void llTeleportAgentHome(string agent)
        {
            m_host.AddScriptLPS(1);
            UUID agentId = new UUID();
            if (UUID.TryParse(agent, out agentId))
            {
                ScenePresence presence = World.GetScenePresence(agentId);
                if (presence != null)
                {
                    // agent must not be a god
                    if (presence.GodLevel >= 200) return;

                    // agent must be over the owners land
                    if (m_host.OwnerID == World.LandChannel.GetLandObject(
                            presence.AbsolutePosition.X, presence.AbsolutePosition.Y).LandData.OwnerID)
                    {
                        presence.ControllingClient.SendTeleportLocationStart();
                        World.TeleportClientHome(agentId, presence.ControllingClient);
                    }
                }
            }
            ScriptSleep(5000);
        }

        public void llTextBox(string avatar, string message, int chat_channel)
        {
            m_host.AddScriptLPS(1);
            NotImplemented("llTextBox");
        }

        public void llModifyLand(int action, int brush)
        {
            m_host.AddScriptLPS(1);
            ITerrainModule tm = m_ScriptEngine.World.RequestModuleInterface<ITerrainModule>();
            if (tm != null)
            {
                tm.ModifyTerrain(m_host.OwnerID, m_host.AbsolutePosition, (byte) brush, (byte) action, m_host.OwnerID);
            }
        }

        public void llCollisionSound(string impact_sound, double impact_volume)
        {
            m_host.AddScriptLPS(1);
            // TODO: Parameter check logic required.
            UUID soundId = UUID.Zero;
            if (!UUID.TryParse(impact_sound, out soundId))
            {
                m_host.TaskInventory.LockItemsForRead(true);
                foreach (TaskInventoryItem item in m_host.TaskInventory.Values)
                {
                    if (item.Type == (int)AssetType.Sound && item.Name == impact_sound)
                    {
                        soundId = item.AssetID;
                        break;
                    }
                }
                m_host.TaskInventory.LockItemsForRead(false);
            }
            m_host.CollisionSound = soundId;
            m_host.CollisionSoundVolume = (float)impact_volume;
        }

        public void llCollisionSprite(string impact_sprite)
        {
            m_host.AddScriptLPS(1);
            NotImplemented("llCollisionSprite");
        }

        public LSL_String llGetAnimation(string id)
        {
            // This should only return a value if the avatar is in the same region
            m_host.AddScriptLPS(1);
            UUID avatar = (UUID)id;
            ScenePresence presence = World.GetScenePresence(avatar);
            if (presence == null)
                return "";

            if (m_host.RegionHandle == presence.RegionHandle)
            {
                Dictionary<UUID, string> animationstateNames = AnimationSet.Animations.AnimStateNames;

                if (presence != null)
                {
                    AnimationSet currentAnims = presence.Animator.Animations;
                    string currentAnimationState = String.Empty;
                    if (animationstateNames.TryGetValue(currentAnims.DefaultAnimation.AnimID, out currentAnimationState))
                        return currentAnimationState;
                }
            }
            
            return String.Empty;
        }

        public void llMessageLinked(int linknumber, int num, string msg, string id)
        {
            m_host.AddScriptLPS(1);

            List<SceneObjectPart> parts = GetLinkParts(linknumber);

            UUID partItemID;
            foreach (SceneObjectPart part in parts)
            {
                //Clone is thread safe
                TaskInventoryDictionary itemsDictionary = (TaskInventoryDictionary)part.TaskInventory.Clone();

                foreach (TaskInventoryItem item in itemsDictionary.Values)
                {
                    if (item.Type == ScriptBaseClass.INVENTORY_SCRIPT)
                    {
                        partItemID = item.ItemID;
                        int linkNumber = m_host.LinkNum;
                        if (m_host.ParentGroup.Children.Count == 1)
                            linkNumber = 0;

                        object[] resobj = new object[]
                                  {
                                      new LSL_Integer(linkNumber), new LSL_Integer(num), new LSL_String(msg), new LSL_String(id)
                                  };

                        m_ScriptEngine.PostScriptEvent(partItemID,
                                new EventParams("link_message",
                                resobj, new DetectParams[0]));
                    }
                }
            }
        }

        public void llPushObject(string target, LSL_Vector impulse, LSL_Vector ang_impulse, int local)
        {
            m_host.AddScriptLPS(1);
            bool pushrestricted = World.RegionInfo.RegionSettings.RestrictPushing;
            bool pushAllowed = false;

            bool pusheeIsAvatar = false;
            UUID targetID = UUID.Zero;

            if (!UUID.TryParse(target,out targetID))
                return;

            ScenePresence pusheeav = null;
            Vector3 PusheePos = Vector3.Zero;
            SceneObjectPart pusheeob = null;

            ScenePresence avatar = World.GetScenePresence(targetID);
            if (avatar != null)
            {
                pusheeIsAvatar = true;

                // Pushee doesn't have a physics actor
                if (avatar.PhysicsActor == null)
                    return;

                // Pushee is in GodMode this pushing object isn't owned by them
                if (avatar.GodLevel > 0 && m_host.OwnerID != targetID)
                    return;

                pusheeav = avatar;

                // Find pushee position
                // Pushee Linked?
                if (pusheeav.ParentID != 0)
                {
                    SceneObjectPart parentobj = World.GetSceneObjectPart(pusheeav.ParentID);
                    if (parentobj != null)
                    {
                        PusheePos = parentobj.AbsolutePosition;
                    }
                    else
                    {
                        PusheePos = pusheeav.AbsolutePosition;
                    }
                }
                else
                {
                    PusheePos = pusheeav.AbsolutePosition;
                }
            }

            if (!pusheeIsAvatar)
            {
                // not an avatar so push is not affected by parcel flags
                pusheeob = World.GetSceneObjectPart((UUID)target);

                // We can't find object
                if (pusheeob == null)
                    return;

                // Object not pushable.  Not an attachment and has no physics component
                if (!pusheeob.IsAttachment && pusheeob.PhysActor == null)
                    return;

                PusheePos = pusheeob.AbsolutePosition;
                pushAllowed = true;
            }
            else
            {
                if (pushrestricted)
                {
                    ILandObject targetlandObj = World.LandChannel.GetLandObject(PusheePos.X, PusheePos.Y);

                    // We didn't find the parcel but region is push restricted so assume it is NOT ok
                    if (targetlandObj == null)
                        return;

                    // Need provisions for Group Owned here
                    if (m_host.OwnerID == targetlandObj.LandData.OwnerID || 
                        targetlandObj.LandData.IsGroupOwned || m_host.OwnerID == targetID)
                    {
                        pushAllowed = true;
                    }
                }
                else
                {
                    ILandObject targetlandObj = World.LandChannel.GetLandObject(PusheePos.X, PusheePos.Y);
                    if (targetlandObj == null)
                    {
                        // We didn't find the parcel but region isn't push restricted so assume it's ok
                        pushAllowed = true;
                    }
                    else
                    {
                        // Parcel push restriction
                        if ((targetlandObj.LandData.Flags & (uint)ParcelFlags.RestrictPushObject) == (uint)ParcelFlags.RestrictPushObject)
                        {
                            // Need provisions for Group Owned here
                            if (m_host.OwnerID == targetlandObj.LandData.OwnerID || 
                                targetlandObj.LandData.IsGroupOwned || 
                                m_host.OwnerID == targetID)
                            {
                                pushAllowed = true;
                            }

                            //ParcelFlags.RestrictPushObject
                            //pushAllowed = true;
                        }
                        else
                        {
                            // Parcel isn't push restricted
                            pushAllowed = true;
                        }
                    }
                }
            }
            if (pushAllowed)
            {
                float distance = (PusheePos - m_host.AbsolutePosition).Length();
                float distance_term = distance * distance * distance; // Script Energy
                float pusher_mass = m_host.GetMass();

                float PUSH_ATTENUATION_DISTANCE = 17f;
                float PUSH_ATTENUATION_SCALE = 5f;
                float distance_attenuation = 1f;
                if (distance > PUSH_ATTENUATION_DISTANCE)
                {
                    float normalized_units = 1f + (distance - PUSH_ATTENUATION_DISTANCE) / PUSH_ATTENUATION_SCALE;
                    distance_attenuation = 1f / normalized_units;
                }

                Vector3 applied_linear_impulse = new Vector3((float)impulse.x, (float)impulse.y, (float)impulse.z);
                {
                    float impulse_length = applied_linear_impulse.Length();

                    float desired_energy = impulse_length * pusher_mass;
                    if (desired_energy > 0f)
                        desired_energy += distance_term;

                    float scaling_factor = 1f;
                    scaling_factor *= distance_attenuation;
                    applied_linear_impulse *= scaling_factor;

                }
                if (pusheeIsAvatar)
                {
                    if (pusheeav != null)
                    {
                        if (pusheeav.PhysicsActor != null)
                        {
                            if (local != 0)
                            {
                                applied_linear_impulse *= m_host.GetWorldRotation();
                            }
                            pusheeav.PhysicsActor.AddForce(applied_linear_impulse, true);
                        }
                    }
                }
                else
                {
                    if (pusheeob != null)
                    {
                        if (pusheeob.PhysActor != null)
                        {
                            pusheeob.ApplyImpulse(applied_linear_impulse, local != 0);
                        }
                    }
                }
            }
        }

        public void llPassCollisions(int pass)
        {
            m_host.AddScriptLPS(1);
            if (pass == 0)
            {
                m_host.ParentGroup.PassCollision = false;
            }
            else
            {
                m_host.ParentGroup.PassCollision = true;
            }
        }

        public LSL_String llGetScriptName()
        {
            string result = String.Empty;

            m_host.AddScriptLPS(1);

            m_host.TaskInventory.LockItemsForRead(true);
            foreach (TaskInventoryItem item in m_host.TaskInventory.Values)
            {
                if (item.Type == 10 && item.ItemID == m_itemID)
                {
                    result =  item.Name!=null?item.Name:String.Empty;
                    break;
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            return result;
        }

        public LSL_Integer llGetNumberOfSides()
        {
            m_host.AddScriptLPS(1);

            return GetNumberOfSides(m_host);
        }

        protected int GetNumberOfSides(SceneObjectPart part)
        {
            int sides = part.GetNumberOfSides();

            if (part.GetPrimType() == PrimType.SPHERE && part.Shape.ProfileHollow > 0)
            {
                // Make up for a bug where LSL shows 4 sides rather than 2
                sides += 2;
            }

            return sides;
        }
        

        /* The new / changed functions were tested with the following LSL script:

        default
        {
            state_entry()
            {
                rotation rot = llEuler2Rot(<0,70,0> * DEG_TO_RAD);

                llOwnerSay("to get here, we rotate over: "+ (string) llRot2Axis(rot));
                llOwnerSay("and we rotate for: "+ (llRot2Angle(rot) * RAD_TO_DEG));

                // convert back and forth between quaternion <-> vector and angle

                rotation newrot = llAxisAngle2Rot(llRot2Axis(rot),llRot2Angle(rot));

                llOwnerSay("Old rotation was: "+(string) rot);
                llOwnerSay("re-converted rotation is: "+(string) newrot);

                llSetRot(rot);  // to check the parameters in the prim
            }
        }
        */

        // Xantor 29/apr/2008
        // Returns rotation described by rotating angle radians about axis.
        // q = cos(a/2) + i (x * sin(a/2)) + j (y * sin(a/2)) + k (z * sin(a/2))
        public LSL_Rotation llAxisAngle2Rot(LSL_Vector axis, double angle)
        {
            m_host.AddScriptLPS(1);

            double x, y, z, s, t;

            s = Math.Cos(angle * 0.5);
            t = Math.Sin(angle * 0.5); // temp value to avoid 2 more sin() calcs
            x = axis.x * t;
            y = axis.y * t;
            z = axis.z * t;

            return new LSL_Rotation(x,y,z,s);
        }


        // Xantor 29/apr/2008
        // converts a Quaternion to X,Y,Z axis rotations
        public LSL_Vector llRot2Axis(LSL_Rotation rot)
        {
            m_host.AddScriptLPS(1);
            double x,y,z;

            if (rot.s > 1) // normalization needed
            {
                double length = Math.Sqrt(rot.x * rot.x + rot.y * rot.y +
                        rot.z * rot.z + rot.s * rot.s);

                rot.x /= length;
                rot.y /= length;
                rot.z /= length;
                rot.s /= length;

            }

            // double angle = 2 * Math.Acos(rot.s);
            double s = Math.Sqrt(1 - rot.s * rot.s);
            if (s < 0.001)
            {
                x = 1;
                y = z = 0;
            }
            else
            {
                x = rot.x / s; // normalise axis
                y = rot.y / s;
                z = rot.z / s;
            }

            return new LSL_Vector(x,y,z);
        }


        // Returns the angle of a quaternion (see llRot2Axis for the axis)
        public LSL_Float llRot2Angle(LSL_Rotation rot)
        {
            m_host.AddScriptLPS(1);

            if (rot.s > 1) // normalization needed
            {
                double length = Math.Sqrt(rot.x * rot.x + rot.y * rot.y +
                        rot.z * rot.z + rot.s * rot.s);

                rot.x /= length;
                rot.y /= length;
                rot.z /= length;
                rot.s /= length;
            }

            double angle = 2 * Math.Acos(rot.s);

            return angle;
        }

        public LSL_Float llAcos(double val)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Acos(val);
        }

        public LSL_Float llAsin(double val)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Asin(val);
        }

        // Xantor 30/apr/2008
        public LSL_Float llAngleBetween(LSL_Rotation a, LSL_Rotation b)
        {
            m_host.AddScriptLPS(1);

            double angle = Math.Acos(a.x * b.x + a.y * b.y + a.z * b.z + a.s * b.s) * 2;
            if (angle < 0) angle = -angle;
            if (angle > Math.PI) return (Math.PI * 2 - angle);
            return angle;
        }

        public LSL_String llGetInventoryKey(string name)
        {
            m_host.AddScriptLPS(1);

            m_host.TaskInventory.LockItemsForRead(true);
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Name == name)
                {
                    if ((inv.Value.CurrentPermissions & (uint)(PermissionMask.Copy | PermissionMask.Transfer | PermissionMask.Modify)) == (uint)(PermissionMask.Copy | PermissionMask.Transfer | PermissionMask.Modify))
                    {
                        m_host.TaskInventory.LockItemsForRead(false);
                        return inv.Value.AssetID.ToString();
                    }
                    else
                    {
                        m_host.TaskInventory.LockItemsForRead(false);
                        return UUID.Zero.ToString();
                    }
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            return UUID.Zero.ToString();
        }

        public void llAllowInventoryDrop(int add)
        {
            m_host.AddScriptLPS(1);

            if (add != 0)
                m_host.ParentGroup.RootPart.AllowedDrop = true;
            else
                m_host.ParentGroup.RootPart.AllowedDrop = false;

            // Update the object flags
            m_host.ParentGroup.RootPart.aggregateScriptEvents();
        }

        public LSL_Vector llGetSunDirection()
        {
            m_host.AddScriptLPS(1);

            LSL_Vector SunDoubleVector3;
            Vector3 SunFloatVector3;

            // sunPosition estate setting is set in OpenSim.Region.CoreModules.SunModule
            // have to convert from Vector3 (float) to LSL_Vector (double)
            SunFloatVector3 = World.RegionInfo.RegionSettings.SunVector;
            SunDoubleVector3.x = (double)SunFloatVector3.X;
            SunDoubleVector3.y = (double)SunFloatVector3.Y;
            SunDoubleVector3.z = (double)SunFloatVector3.Z;

            return SunDoubleVector3;
        }

        public LSL_Vector llGetTextureOffset(int face)
        {
            m_host.AddScriptLPS(1);
            return GetTextureOffset(m_host, face);
        }

        protected LSL_Vector GetTextureOffset(SceneObjectPart part, int face)
        {
            Primitive.TextureEntry tex = part.Shape.Textures;
            LSL_Vector offset = new LSL_Vector();
            if (face == ScriptBaseClass.ALL_SIDES)
            {
                face = 0;
            }
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                offset.x = tex.GetFace((uint)face).OffsetU;
                offset.y = tex.GetFace((uint)face).OffsetV;
                offset.z = 0.0;
                return offset;
            }
            else
            {
                return offset;
            }
        }

        public LSL_Vector llGetTextureScale(int side)
        {
            m_host.AddScriptLPS(1);
            Primitive.TextureEntry tex = m_host.Shape.Textures;
            LSL_Vector scale;
            if (side == -1)
            {
                side = 0;
            }
            scale.x = tex.GetFace((uint)side).RepeatU;
            scale.y = tex.GetFace((uint)side).RepeatV;
            scale.z = 0.0;
            return scale;
        }

        public LSL_Float llGetTextureRot(int face)
        {
            m_host.AddScriptLPS(1);
            return GetTextureRot(m_host, face);
        }

        protected LSL_Float GetTextureRot(SceneObjectPart part, int face)
        {
            Primitive.TextureEntry tex = part.Shape.Textures;
            if (face == -1)
            {
                face = 0;
            }
            if (face >= 0 && face < GetNumberOfSides(part))
            {
                return tex.GetFace((uint)face).Rotation;
            }
            else
            {
                return 0.0;
            }
        }

        public LSL_Integer llSubStringIndex(string source, string pattern)
        {
            m_host.AddScriptLPS(1);
            return source.IndexOf(pattern);
        }

        public LSL_String llGetOwnerKey(string id)
        {
            m_host.AddScriptLPS(1);
            UUID key = new UUID();
            if (UUID.TryParse(id, out key))
            {
                try
                {
                    SceneObjectPart obj = World.GetSceneObjectPart(key);
                    if (obj == null)
                        return id; // the key is for an agent so just return the key
                    else
                        return obj.OwnerID.ToString();
                }
                catch (KeyNotFoundException)
                {
                    return id; // The Object/Agent not in the region so just return the key
                }
            }
            else
            {
                return UUID.Zero.ToString();
            }
        }

        public LSL_Vector llGetCenterOfMass()
        {
            m_host.AddScriptLPS(1);
            Vector3 center = m_host.GetGeometricCenter();
            return new LSL_Vector(center.X,center.Y,center.Z);
        }

        public LSL_List llListSort(LSL_List src, int stride, int ascending)
        {
            m_host.AddScriptLPS(1);

            if (stride <= 0)
            {
                stride = 1;
            }
            return src.Sort(stride, ascending);
        }

        public LSL_Integer llGetListLength(LSL_List src)
        {
            m_host.AddScriptLPS(1);

            if (src == null)
            {
                return 0;
            }
            else
            {
                return src.Length;
            }
        }

        public LSL_Integer llList2Integer(LSL_List src, int index)
        {
            m_host.AddScriptLPS(1);
            if (index < 0)
            {
                index = src.Length + index;
            }
            if (index >= src.Length || index < 0)
            {
                return 0;
            }
            try
            {
                if (src.Data[index] is LSL_Integer)
                    return (LSL_Integer) src.Data[index];
                else if (src.Data[index] is LSL_Float)
                    return Convert.ToInt32(((LSL_Float) src.Data[index]).value);
                return new LSL_Integer(src.Data[index].ToString());
            }
            catch (FormatException)
            {
                return 0;
            }
        }

        public LSL_Float llList2Float(LSL_List src, int index)
        {
            m_host.AddScriptLPS(1);
            if (index < 0)
            {
                index = src.Length + index;
            }
            if (index >= src.Length || index < 0)
            {
                return 0.0;
            }
            try
            {
                if (src.Data[index] is LSL_Integer)
                    return Convert.ToDouble(((LSL_Integer) src.Data[index]).value);
                else if (src.Data[index] is LSL_Float)
                    return Convert.ToDouble(((LSL_Float) src.Data[index]).value);
                else if (src.Data[index] is LSL_String)
                    return Convert.ToDouble(((LSL_String) src.Data[index]).m_string);
                return Convert.ToDouble(src.Data[index]);
            }
            catch (FormatException)
            {
                return 0.0;
            }
        }

        public LSL_String llList2String(LSL_List src, int index)
        {
            m_host.AddScriptLPS(1);
            if (index < 0)
            {
                index = src.Length + index;
            }
            if (index >= src.Length || index < 0)
            {
                return String.Empty;
            }
            return src.Data[index].ToString();
        }

        public LSL_String llList2Key(LSL_List src, int index)
        {
            m_host.AddScriptLPS(1);
            if (index < 0)
            {
                index = src.Length + index;
            }
            if (index >= src.Length || index < 0)
            {
                return "";
            }
            return src.Data[index].ToString();
        }

        public LSL_Vector llList2Vector(LSL_List src, int index)
        {
            m_host.AddScriptLPS(1);
            if (index < 0)
            {
                index = src.Length + index;
            }
            if (index >= src.Length || index < 0)
            {
                return new LSL_Vector(0, 0, 0);
            }
            if (src.Data[index].GetType() == typeof(LSL_Vector))
            {
                return (LSL_Vector)src.Data[index];
            }
            else
            {
                return new LSL_Vector(src.Data[index].ToString());
            }
        }

        public LSL_Rotation llList2Rot(LSL_List src, int index)
        {
            m_host.AddScriptLPS(1);
            if (index < 0)
            {
                index = src.Length + index;
            }
            if (index >= src.Length || index < 0)
            {
                return new LSL_Rotation(0, 0, 0, 1);
            }
            if (src.Data[index].GetType() == typeof(LSL_Rotation))
            {
                return (LSL_Rotation)src.Data[index];
            }
            else
            {
                return new LSL_Rotation(src.Data[index].ToString());
            }
        }

        public LSL_List llList2List(LSL_List src, int start, int end)
        {
            m_host.AddScriptLPS(1);
            return src.GetSublist(start, end);
        }

        public LSL_List llDeleteSubList(LSL_List src, int start, int end)
        {
            return src.DeleteSublist(start, end);
        }

        public LSL_Integer llGetListEntryType(LSL_List src, int index)
        {
            m_host.AddScriptLPS(1);
            if (index < 0)
            {
                index = src.Length + index;
            }
            if (index >= src.Length)
            {
                return 0;
            }

            if (src.Data[index] is LSL_Integer || src.Data[index] is Int32)
                return 1;
            if (src.Data[index] is LSL_Float || src.Data[index] is Single || src.Data[index] is Double)
                return 2;
            if (src.Data[index] is LSL_String || src.Data[index] is String)
            {
                UUID tuuid;
                if (UUID.TryParse(src.Data[index].ToString(), out tuuid))
                {
                    return 4;
                }
                else
                {
                    return 3;
                }
            }
            if (src.Data[index] is LSL_Vector)
                return 5;
            if (src.Data[index] is LSL_Rotation)
                return 6;
            if (src.Data[index] is LSL_List)
                return 7;
            return 0;

        }

        /// <summary>
        /// Process the supplied list and return the
        /// content of the list formatted as a comma
        /// separated list. There is a space after
        /// each comma.
        /// </summary>

        public LSL_String llList2CSV(LSL_List src)
        {

            string ret = String.Empty;
            int    x   = 0;

            m_host.AddScriptLPS(1);

            if (src.Data.Length > 0)
            {
                ret = src.Data[x++].ToString();
                for (; x < src.Data.Length; x++)
                {
                    ret += ", "+src.Data[x].ToString();
                }
            }

            return ret;
        }

        /// <summary>
        /// The supplied string is scanned for commas
        /// and converted into a list. Commas are only
        /// effective if they are encountered outside
        /// of '<' '>' delimiters. Any whitespace
        /// before or after an element is trimmed.
        /// </summary>

        public LSL_List llCSV2List(string src)
        {

            LSL_List result = new LSL_List();
            int parens = 0;
            int start  = 0;
            int length = 0;

            m_host.AddScriptLPS(1);

            for (int i = 0; i < src.Length; i++)
            {
                switch (src[i])
                {
                    case '<':
                        parens++;
                        length++;
                        break;
                    case '>':
                        if (parens > 0)
                            parens--;
                        length++;
                        break;
                    case ',':
                        if (parens == 0)
                        {
                            result.Add(src.Substring(start,length).Trim());
                            start += length+1;
                            length = 0;
                        }
                        else
                        {
                            length++;
                        }
                        break;
                    default:
                        length++;
                        break;
                }
            }

            result.Add(src.Substring(start,length).Trim());

            return result;
        }

        ///  <summary>
        ///  Randomizes the list, be arbitrarily reordering
        ///  sublists of stride elements. As the stride approaches
        ///  the size of the list, the options become very
        ///  limited.
        ///  </summary>
        ///  <remarks>
        ///  This could take a while for very large list
        ///  sizes.
        ///  </remarks>

        public LSL_List llListRandomize(LSL_List src, int stride)
        {
            LSL_List result;
            Random rand           = new Random();

            int   chunkk;
            int[] chunks;

            m_host.AddScriptLPS(1);

            if (stride <= 0)
            {
                stride = 1;
            }

            // Stride MUST be a factor of the list length
            // If not, then return the src list. This also
            // traps those cases where stride > length.

            if (src.Length != stride && src.Length%stride == 0)
            {
                chunkk = src.Length/stride;

                chunks = new int[chunkk];

                for (int i = 0; i < chunkk; i++)
                    chunks[i] = i;

                // Knuth shuffle the chunkk index
                for (int i = chunkk - 1; i >= 1; i--)
                {
                    // Elect an unrandomized chunk to swap
                    int index = rand.Next(i + 1);
                    int tmp;

                    // and swap position with first unrandomized chunk
                    tmp = chunks[i];
                    chunks[i] = chunks[index];
                    chunks[index] = tmp;
                }

                // Construct the randomized list

                result = new LSL_List();

                for (int i = 0; i < chunkk; i++)
                {
                    for (int j = 0; j < stride; j++)
                    {
                        result.Add(src.Data[chunks[i]*stride+j]);
                    }
                }
            }
            else {
                object[] array = new object[src.Length];
                Array.Copy(src.Data, 0, array, 0, src.Length);
                result = new LSL_List(array);
            }

            return result;
        }

        /// <summary>
        /// Elements in the source list starting with 0 and then
        /// every i+stride. If the stride is negative then the scan
        /// is backwards producing an inverted result.
        /// Only those elements that are also in the specified
        /// range are included in the result.
        /// </summary>

        public LSL_List llList2ListStrided(LSL_List src, int start, int end, int stride)
        {

            LSL_List result = new LSL_List();
            int[] si = new int[2];
            int[] ei = new int[2];
            bool twopass = false;

            m_host.AddScriptLPS(1);

            //  First step is always to deal with negative indices

            if (start < 0)
                start = src.Length+start;
            if (end   < 0)
                end   = src.Length+end;

            //  Out of bounds indices are OK, just trim them
            //  accordingly

            if (start > src.Length)
                start = src.Length;

            if (end > src.Length)
                end = src.Length;

            if (stride == 0)
                stride = 1;

            //  There may be one or two ranges to be considered

            if (start != end)
            {

                if (start <= end)
                {
                   si[0] = start;
                   ei[0] = end;
                }
                else
                {
                   si[1] = start;
                   ei[1] = src.Length;
                   si[0] = 0;
                   ei[0] = end;
                   twopass = true;
                }

                //  The scan always starts from the beginning of the
                //  source list, but members are only selected if they
                //  fall within the specified sub-range. The specified
                //  range values are inclusive.
                //  A negative stride reverses the direction of the
                //  scan producing an inverted list as a result.

                if (stride > 0)
                {
                    for (int i = 0; i < src.Length; i += stride)
                    {
                        if (i<=ei[0] && i>=si[0])
                            result.Add(src.Data[i]);
                        if (twopass && i>=si[1] && i<=ei[1])
                            result.Add(src.Data[i]);
                    }
                }
                else if (stride < 0)
                {
                    for (int i = src.Length - 1; i >= 0; i += stride)
                    {
                        if (i <= ei[0] && i >= si[0])
                            result.Add(src.Data[i]);
                        if (twopass && i >= si[1] && i <= ei[1])
                            result.Add(src.Data[i]);
                    }
                }
            }
            else
            {
                if (start%stride == 0)
                {
                    result.Add(src.Data[start]);
                }
            }

            return result;
        }

        public LSL_Integer llGetRegionAgentCount()
        {
            m_host.AddScriptLPS(1);
            return new LSL_Integer(World.GetRootAgentCount());
        }

        public LSL_Vector llGetRegionCorner()
        {
            m_host.AddScriptLPS(1);
            return new LSL_Vector(World.RegionInfo.RegionLocX * Constants.RegionSize, World.RegionInfo.RegionLocY * Constants.RegionSize, 0);
        }

        /// <summary>
        /// Insert the list identified by <src> into the
        /// list designated by <dest> such that the first
        /// new element has the index specified by <index>
        /// </summary>

        public LSL_List llListInsertList(LSL_List dest, LSL_List src, int index)
        {

            LSL_List pref = null;
            LSL_List suff = null;

            m_host.AddScriptLPS(1);

            if (index < 0)
            {
                index = index+dest.Length;
                if (index < 0)
                {
                    index = 0;
                }
            }

            if (index != 0)
            {
                pref = dest.GetSublist(0,index-1);
                if (index < dest.Length)
                {
                    suff = dest.GetSublist(index,-1);
                    return pref + src + suff;
                }
                else
                {
                    return pref + src;
                }
            }
            else
            {
                if (index < dest.Length)
                {
                    suff = dest.GetSublist(index,-1);
                    return src + suff;
                }
                else
                {
                    return src;
                }
            }

        }

        /// <summary>
        /// Returns the index of the first occurrence of test
        /// in src.
        /// </summary>

        public LSL_Integer llListFindList(LSL_List src, LSL_List test)
        {

            int index  = -1;
            int length = src.Length - test.Length + 1;

            m_host.AddScriptLPS(1);

            // If either list is empty, do not match

            if (src.Length != 0 && test.Length != 0)
            {
                for (int i = 0; i < length; i++)
                {
                    if (src.Data[i].Equals(test.Data[0]))
                    {
                        int j;
                        for (j = 1; j < test.Length; j++)
                            if (!src.Data[i+j].Equals(test.Data[j]))
                                break;
                        if (j == test.Length)
                        {
                            index = i;
                            break;
                        }
                    }
                }
            }

            return index;

        }

        public LSL_String llGetObjectName()
        {
            m_host.AddScriptLPS(1);
            return m_host.Name!=null?m_host.Name:String.Empty;
        }

        public void llSetObjectName(string name)
        {
            m_host.AddScriptLPS(1);
            m_host.Name = name!=null?name:String.Empty;
        }

        public LSL_String llGetDate()
        {
            m_host.AddScriptLPS(1);
            DateTime date = DateTime.Now.ToUniversalTime();
            string result = date.ToString("yyyy-MM-dd");
            return result;
        }

        public LSL_Integer llEdgeOfWorld(LSL_Vector pos, LSL_Vector dir)
        {
            m_host.AddScriptLPS(1);

            // edge will be used to pass the Region Coordinates offset
            // we want to check for a neighboring sim
            LSL_Vector edge = new LSL_Vector(0, 0, 0);

            if (dir.x == 0)
            {
                if (dir.y == 0)
                {
                    // Direction vector is 0,0 so return
                    // false since we're staying in the sim
                    return 0;
                }
                else
                {
                    // Y is the only valid direction
                    edge.y = dir.y / Math.Abs(dir.y);
                }
            }
            else
            {
                LSL_Float mag;
                if (dir.x > 0)
                {
                    mag = (Constants.RegionSize - pos.x) / dir.x;
                }
                else
                {
                    mag = (pos.x/dir.x);
                }

                mag = Math.Abs(mag);

                edge.y = pos.y + (dir.y * mag);

                if (edge.y > Constants.RegionSize || edge.y < 0)
                {
                    // Y goes out of bounds first
                    edge.y = dir.y / Math.Abs(dir.y);
                }
                else
                {
                    // X goes out of bounds first or its a corner exit
                    edge.y = 0;
                    edge.x = dir.x / Math.Abs(dir.x);
                }
            }

            List<GridRegion> neighbors = World.GridService.GetNeighbours(World.RegionInfo.ScopeID, World.RegionInfo.RegionID);

            uint neighborX = World.RegionInfo.RegionLocX + (uint)dir.x;
            uint neighborY = World.RegionInfo.RegionLocY + (uint)dir.y;

            foreach (GridRegion sri in neighbors)
            {
                if (sri.RegionLocX == neighborX && sri.RegionLocY == neighborY)
                    return 0;
            }

            return 1;
        }

        /// <summary>
        /// Not fully implemented yet. Still to do:-
        /// AGENT_BUSY
        /// Remove as they are done
        /// </summary>
        public LSL_Integer llGetAgentInfo(string id)
        {
            m_host.AddScriptLPS(1);

            UUID key = new UUID();
            if (!UUID.TryParse(id, out key))
            {
                return 0;
            }

            int flags = 0;

            ScenePresence agent = World.GetScenePresence(key);
            if (agent == null)
            {
                return 0;
            }

            if (agent.IsChildAgent)
                return 0; // Fail if they are not in the same region

            // note: in OpenSim, sitting seems to cancel AGENT_ALWAYS_RUN, unlike SL
            if (agent.SetAlwaysRun)
            {
                flags |= ScriptBaseClass.AGENT_ALWAYS_RUN;
            }

            if (agent.HasAttachments())
            {
                flags |= ScriptBaseClass.AGENT_ATTACHMENTS;
                if (agent.HasScriptedAttachments())
                    flags |= ScriptBaseClass.AGENT_SCRIPTED;
            }

            if ((agent.AgentControlFlags & (uint)AgentManager.ControlFlags.AGENT_CONTROL_FLY) != 0)
            {
                flags |= ScriptBaseClass.AGENT_FLYING;
                flags |= ScriptBaseClass.AGENT_IN_AIR; // flying always implies in-air, even if colliding with e.g. a wall
            }

            if ((agent.AgentControlFlags & (uint)AgentManager.ControlFlags.AGENT_CONTROL_AWAY) != 0)
            {
                flags |= ScriptBaseClass.AGENT_AWAY;
            }

            // seems to get unset, even if in mouselook, when avatar is sitting on a prim???
            if ((agent.AgentControlFlags & (uint)AgentManager.ControlFlags.AGENT_CONTROL_MOUSELOOK) != 0)
            {
                flags |= ScriptBaseClass.AGENT_MOUSELOOK;
            }

            if ((agent.State & (byte)AgentState.Typing) != (byte)0)
            {
                flags |= ScriptBaseClass.AGENT_TYPING;
            }

            string agentMovementAnimation = agent.Animator.GetMovementAnimation();

            if (agentMovementAnimation == "CROUCH")
            {
                flags |= ScriptBaseClass.AGENT_CROUCHING;
            }

            if (agentMovementAnimation == "WALK" || agentMovementAnimation == "CROUCHWALK")
            {
                flags |= ScriptBaseClass.AGENT_WALKING;
            }

            // not colliding implies in air. Note: flying also implies in-air, even if colliding (see above)

            // note: AGENT_IN_AIR and AGENT_WALKING seem to be mutually exclusive states in SL.

            // note: this may need some tweaking when walking downhill. you "fall down" for a brief instant
            // and don't collide when walking downhill, which instantly registers as in-air, briefly. should
            // there be some minimum non-collision threshold time before claiming the avatar is in-air?
            if ((flags & ScriptBaseClass.AGENT_WALKING) == 0 &&
                agent.PhysicsActor != null &&
                !agent.PhysicsActor.IsColliding)
            {
                    flags |= ScriptBaseClass.AGENT_IN_AIR;
            }

             if (agent.ParentID != 0)
             {
                 flags |= ScriptBaseClass.AGENT_ON_OBJECT;
                 flags |= ScriptBaseClass.AGENT_SITTING;
             }

             if (agent.Animator.Animations.DefaultAnimation.AnimID 
                == AnimationSet.Animations.AnimsUUID["SIT_GROUND_CONSTRAINED"])
             {
                 flags |= ScriptBaseClass.AGENT_SITTING;
             }

            return flags;
        }

        public LSL_String llGetAgentLanguage(string id)
        {
            // This should only return a value if the avatar is in the same region
            //ckrinke 1-30-09 : This needs to parse the XMLRPC language field supplied
            //by the client at login. Currently returning only en-us until our I18N
            //effort gains momentum
            m_host.AddScriptLPS(1);
            return "en-us";
        }

        public void llAdjustSoundVolume(double volume)
        {
            m_host.AddScriptLPS(1);
            m_host.AdjustSoundGain(volume);
            ScriptSleep(100);
        }

        public void llSetSoundQueueing(int queue)
        {
            m_host.AddScriptLPS(1);
            NotImplemented("llSetSoundQueueing");
        }

        public void llSetSoundRadius(double radius)
        {
            m_host.AddScriptLPS(1);
            m_host.SoundRadius = radius;
        }

        public LSL_String llKey2Name(string id)
        {
            m_host.AddScriptLPS(1);
            UUID key = new UUID();
            if (UUID.TryParse(id,out key))
            {
                ScenePresence presence = World.GetScenePresence(key);

                if (presence != null)
                {
                    return presence.ControllingClient.Name;
                    //return presence.Name;
                }

                if (World.GetSceneObjectPart(key) != null)
                {
                    return World.GetSceneObjectPart(key).Name;
                }
            }
            return String.Empty;
        }



        public void llSetTextureAnim(int mode, int face, int sizex, int sizey, double start, double length, double rate)
        {
            m_host.AddScriptLPS(1);

            SetTextureAnim(m_host, mode, face, sizex, sizey, start, length, rate);
        }

        public void llSetLinkTextureAnim(int linknumber, int mode, int face, int sizex, int sizey, double start, double length, double rate)
        {
            m_host.AddScriptLPS(1);

            List<SceneObjectPart> parts = GetLinkParts(linknumber);

            foreach (var part in parts)
            {
                SetTextureAnim(part, mode, face, sizex, sizey, start, length, rate);
            }
        }

        private void SetTextureAnim(SceneObjectPart part, int mode, int face, int sizex, int sizey, double start, double length, double rate)
        {

            Primitive.TextureAnimation pTexAnim = new Primitive.TextureAnimation();
            pTexAnim.Flags = (Primitive.TextureAnimMode)mode;

            //ALL_SIDES
            if (face == ScriptBaseClass.ALL_SIDES)
                face = 255;

            pTexAnim.Face = (uint)face;
            pTexAnim.Length = (float)length;
            pTexAnim.Rate = (float)rate;
            pTexAnim.SizeX = (uint)sizex;
            pTexAnim.SizeY = (uint)sizey;
            pTexAnim.Start = (float)start;

            part.AddTextureAnimation(pTexAnim);
            part.SendFullUpdateToAllClients();
            part.ParentGroup.HasGroupChanged = true;
        }

        public void llTriggerSoundLimited(string sound, double volume, LSL_Vector top_north_east,
                                          LSL_Vector bottom_south_west)
        {
            m_host.AddScriptLPS(1);
            float radius1 = (float)llVecDist(llGetPos(), top_north_east);
            float radius2 = (float)llVecDist(llGetPos(), bottom_south_west);
            float radius = Math.Abs(radius1 - radius2);
            m_host.SendSound(KeyOrName(sound).ToString(), volume, true, 0, radius, false, false);
        }

        public void llEjectFromLand(string pest)
        {
            m_host.AddScriptLPS(1);
            UUID agentId = new UUID();
            if (UUID.TryParse(pest, out agentId))
            {
                ScenePresence presence = World.GetScenePresence(agentId);
                if (presence != null)
                {
                    // agent must be over the owners land
                    if (m_host.OwnerID == World.LandChannel.GetLandObject(
                            presence.AbsolutePosition.X, presence.AbsolutePosition.Y).LandData.OwnerID)
                        World.TeleportClientHome(agentId, presence.ControllingClient);
                }
            }
            ScriptSleep(5000);
        }

        public LSL_List llParseString2List(string str, LSL_List separators, LSL_List in_spacers)
        {
            m_host.AddScriptLPS(1);
            LSL_List ret = new LSL_List();
            LSL_List spacers = new LSL_List();
            if (in_spacers.Length > 0 && separators.Length > 0)
            {
                for (int i = 0; i < in_spacers.Length; i++)
                {
                    object s = in_spacers.Data[i];
                    for (int j = 0; j < separators.Length; j++)
                    {
                        if (separators.Data[j].ToString() == s.ToString())
                        {
                            s = null;
                            break;
                        }
                    }
                    if (s != null)
                    {
                        spacers.Add(s);
                    }
                }
            }
            object[] delimiters = new object[separators.Length + spacers.Length];
            separators.Data.CopyTo(delimiters, 0);
            spacers.Data.CopyTo(delimiters, separators.Length);
            bool dfound = false;
            do
            {
                dfound = false;
                int cindex = -1;
                string cdeli = "";
                for (int i = 0; i < delimiters.Length; i++)
                {
                    int index = str.IndexOf(delimiters[i].ToString());
                    bool found = index != -1;
                    if (found && String.Empty != delimiters[i].ToString())
                    {
                        if ((cindex > index) || (cindex == -1))
                        {
                            cindex = index;
                            cdeli = delimiters[i].ToString();
                        }
                        dfound = dfound || found;
                    }
                }
                if (cindex != -1)
                {
                    if (cindex > 0)
                    {
                        ret.Add(new LSL_String(str.Substring(0, cindex)));
                    }
                    // Cannot use spacers.Contains() because spacers may be either type String or LSLString
                    for (int j = 0; j < spacers.Length; j++)
                    {
                        if (spacers.Data[j].ToString() == cdeli)
                        {
                            ret.Add(new LSL_String(cdeli));
                            break;
                        }
                    }
                    str = str.Substring(cindex + cdeli.Length);
                }
            } while (dfound);
            if (str != "")
            {
                ret.Add(new LSL_String(str));
            }
            return ret;
        }

        public LSL_Integer llOverMyLand(string id)
        {
            m_host.AddScriptLPS(1);
            UUID key = new UUID();
            if (UUID.TryParse(id, out key))
            {
                ScenePresence presence = World.GetScenePresence(key);
                if (presence != null) // object is an avatar
                {
                    if (m_host.OwnerID
                        == World.LandChannel.GetLandObject(
                            presence.AbsolutePosition.X, presence.AbsolutePosition.Y).LandData.OwnerID)
                        return 1;
                }
                else // object is not an avatar
                {
                    SceneObjectPart obj = World.GetSceneObjectPart(key);
                    if (obj != null)
                        if (m_host.OwnerID
                            == World.LandChannel.GetLandObject(
                                obj.AbsolutePosition.X, obj.AbsolutePosition.Y).LandData.OwnerID)
                            return 1;
                }
            }

            return 0;
        }

        public LSL_String llGetLandOwnerAt(LSL_Vector pos)
        {
            m_host.AddScriptLPS(1);
            return World.LandChannel.GetLandObject((float)pos.x, (float)pos.y).LandData.OwnerID.ToString();
        }

        /// <summary>
        /// According to http://lslwiki.net/lslwiki/wakka.php?wakka=llGetAgentSize
        /// only the height of avatars vary and that says:
        /// Width (x) and depth (y) are constant. (0.45m and 0.6m respectively).
        /// </summary>
        public LSL_Vector llGetAgentSize(string id)
        {
            m_host.AddScriptLPS(1);
            ScenePresence avatar = World.GetScenePresence((UUID)id);
            LSL_Vector agentSize;
            if (avatar == null || avatar.IsChildAgent) // Fail if not in the same region
            {
                agentSize = ScriptBaseClass.ZERO_VECTOR;
            }
            else
            {
                agentSize = new LSL_Vector(0.45, 0.6, avatar.Appearance.AvatarHeight);
            }
            return agentSize;
        }

        public LSL_Integer llSameGroup(string agent)
        {
            m_host.AddScriptLPS(1);
            UUID agentId = new UUID();
            if (!UUID.TryParse(agent, out agentId))
                return new LSL_Integer(0);
            ScenePresence presence = World.GetScenePresence(agentId);
            if (presence == null || presence.IsChildAgent) // Return flase for child agents
                return new LSL_Integer(0);
            IClientAPI client = presence.ControllingClient;
            if (m_host.GroupID == client.ActiveGroupId)
                return new LSL_Integer(1);
            else
                return new LSL_Integer(0);
        }

        public void llUnSit(string id)
        {
            m_host.AddScriptLPS(1);

            UUID key = new UUID();
            if (UUID.TryParse(id, out key))
            {
                ScenePresence av = World.GetScenePresence(key);

                if (av != null)
                {
                    if (llAvatarOnSitTarget() == id)
                    {
                        // if the avatar is sitting on this object, then
                        // we can unsit them.  We don't want random scripts unsitting random people
                        // Lets avoid the popcorn avatar scenario.
                        av.StandUp();
                    }
                    else
                    {
                        // If the object owner also owns the parcel
                        // or
                        // if the land is group owned and the object is group owned by the same group
                        // or
                        // if the object is owned by a person with estate access.

                        ILandObject parcel = World.LandChannel.GetLandObject(av.AbsolutePosition.X, av.AbsolutePosition.Y);
                        if (parcel != null)
                        {
                            if (m_host.OwnerID == parcel.LandData.OwnerID ||
                                (m_host.OwnerID == m_host.GroupID && m_host.GroupID == parcel.LandData.GroupID
                                && parcel.LandData.IsGroupOwned) || World.Permissions.IsGod(m_host.OwnerID))
                            {
                                av.StandUp();
                            }
                        }
                    }
                }

            }

        }

        public LSL_Vector llGroundSlope(LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            //Get the slope normal.  This gives us the equation of the plane tangent to the slope.
            LSL_Vector vsn = llGroundNormal(offset);

            //Plug the x,y coordinates of the slope normal into the equation of the plane to get
            //the height of that point on the plane.  The resulting vector gives the slope.
            Vector3 vsl = new Vector3();
            vsl.X = (float)vsn.x;
            vsl.Y = (float)vsn.y;
            vsl.Z = (float)(((vsn.x * vsn.x) + (vsn.y * vsn.y)) / (-1 * vsn.z));
            vsl.Normalize();
            //Normalization might be overkill here

            return new LSL_Vector(vsl.X, vsl.Y, vsl.Z);
        }

        public LSL_Vector llGroundNormal(LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            Vector3 pos = m_host.GetWorldPosition() + new Vector3((float)offset.x,
                                                                (float)offset.y,
                                                                (float)offset.z);
            // Clamp to valid position
            if (pos.X < 0)
                pos.X = 0;
            else if (pos.X >= World.Heightmap.Width)
                pos.X = World.Heightmap.Width - 1;
            if (pos.Y < 0)
                pos.Y = 0;
            else if (pos.Y >= World.Heightmap.Height)
                pos.Y = World.Heightmap.Height - 1;

            //Find two points in addition to the position to define a plane
            Vector3 p0 = new Vector3(pos.X, pos.Y,
                                     (float)World.Heightmap[(int)pos.X, (int)pos.Y]);
            Vector3 p1 = new Vector3();
            Vector3 p2 = new Vector3();
            if ((pos.X + 1.0f) >= World.Heightmap.Width)
                p1 = new Vector3(pos.X + 1.0f, pos.Y,
                            (float)World.Heightmap[(int)pos.X, (int)pos.Y]);
            else
                p1 = new Vector3(pos.X + 1.0f, pos.Y,
                            (float)World.Heightmap[(int)(pos.X + 1.0f), (int)pos.Y]);
            if ((pos.Y + 1.0f) >= World.Heightmap.Height)
                p2 = new Vector3(pos.X, pos.Y + 1.0f,
                            (float)World.Heightmap[(int)pos.X, (int)pos.Y]);
            else
                p2 = new Vector3(pos.X, pos.Y + 1.0f,
                            (float)World.Heightmap[(int)pos.X, (int)(pos.Y + 1.0f)]);

            //Find normalized vectors from p0 to p1 and p0 to p2
            Vector3 v0 = new Vector3(p1.X - p0.X, p1.Y - p0.Y, p1.Z - p0.Z);
            Vector3 v1 = new Vector3(p2.X - p0.X, p2.Y - p0.Y, p2.Z - p0.Z);
            v0.Normalize();
            v1.Normalize();

            //Find the cross product of the vectors (the slope normal).
            Vector3 vsn = new Vector3();
            vsn.X = (v0.Y * v1.Z) - (v0.Z * v1.Y);
            vsn.Y = (v0.Z * v1.X) - (v0.X * v1.Z);
            vsn.Z = (v0.X * v1.Y) - (v0.Y * v1.X);
            vsn.Normalize();
            //I believe the crossproduct of two normalized vectors is a normalized vector so
            //this normalization may be overkill

            return new LSL_Vector(vsn.X, vsn.Y, vsn.Z);
        }

        public LSL_Vector llGroundContour(LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            LSL_Vector x = llGroundSlope(offset);
            return new LSL_Vector(-x.y, x.x, 0.0);
        }

        public LSL_Integer llGetAttached()
        {
            m_host.AddScriptLPS(1);
            return m_host.ParentGroup.RootPart.AttachmentPoint;
        }

        public LSL_Integer llGetFreeMemory()
        {
            m_host.AddScriptLPS(1);
            // Make scripts designed for LSO happy
            return 16384;
        }

        public LSL_Integer llGetFreeURLs()
        {
            m_host.AddScriptLPS(1);
            if (m_UrlModule != null)
                return new LSL_Integer(m_UrlModule.GetFreeUrls());
            return new LSL_Integer(0);
        }


        public LSL_String llGetRegionName()
        {
            m_host.AddScriptLPS(1);
            return World.RegionInfo.RegionName;
        }

        public LSL_Float llGetRegionTimeDilation()
        {
            m_host.AddScriptLPS(1);
            return (double)World.TimeDilation;
        }

        /// <summary>
        /// Returns the value reported in the client Statistics window
        /// </summary>
        public LSL_Float llGetRegionFPS()
        {
            m_host.AddScriptLPS(1);
            return World.SimulatorFPS;
        }
        

        /* particle system rules should be coming into this routine as doubles, that is
        rule[0] should be an integer from this list and rule[1] should be the arg
        for the same integer. wiki.secondlife.com has most of this mapping, but some
        came from http://www.caligari-designs.com/p4u2

        We iterate through the list for 'Count' elements, incrementing by two for each
        iteration and set the members of Primitive.ParticleSystem, one at a time.
        */

        public enum PrimitiveRule : int
        {
            PSYS_PART_FLAGS = 0,
            PSYS_PART_START_COLOR = 1,
            PSYS_PART_START_ALPHA = 2,
            PSYS_PART_END_COLOR = 3,
            PSYS_PART_END_ALPHA = 4,
            PSYS_PART_START_SCALE = 5,
            PSYS_PART_END_SCALE = 6,
            PSYS_PART_MAX_AGE = 7,
            PSYS_SRC_ACCEL = 8,
            PSYS_SRC_PATTERN = 9,
            PSYS_SRC_TEXTURE = 12,
            PSYS_SRC_BURST_RATE = 13,
            PSYS_SRC_BURST_PART_COUNT = 15,
            PSYS_SRC_BURST_RADIUS = 16,
            PSYS_SRC_BURST_SPEED_MIN = 17,
            PSYS_SRC_BURST_SPEED_MAX = 18,
            PSYS_SRC_MAX_AGE = 19,
            PSYS_SRC_TARGET_KEY = 20,
            PSYS_SRC_OMEGA = 21,
            PSYS_SRC_ANGLE_BEGIN = 22,
            PSYS_SRC_ANGLE_END = 23
        }

        internal Primitive.ParticleSystem.ParticleDataFlags ConvertUINTtoFlags(uint flags)
        {
            Primitive.ParticleSystem.ParticleDataFlags returnval = Primitive.ParticleSystem.ParticleDataFlags.None;

            return returnval;
        }

        protected Primitive.ParticleSystem getNewParticleSystemWithSLDefaultValues()
        {
            Primitive.ParticleSystem ps = new Primitive.ParticleSystem();

            // TODO find out about the other defaults and add them here
            ps.PartStartColor = new Color4(1.0f, 1.0f, 1.0f, 1.0f);
            ps.PartEndColor = new Color4(1.0f, 1.0f, 1.0f, 1.0f);
            ps.PartStartScaleX = 1.0f;
            ps.PartStartScaleY = 1.0f;
            ps.PartEndScaleX = 1.0f;
            ps.PartEndScaleY = 1.0f;
            ps.BurstSpeedMin = 1.0f;
            ps.BurstSpeedMax = 1.0f;
            ps.BurstRate = 0.1f;
            ps.PartMaxAge = 10.0f;
            return ps;
        }

        public void llLinkParticleSystem(int linknumber, LSL_List rules)
        {
            m_host.AddScriptLPS(1);

            List<SceneObjectPart> parts = GetLinkParts(linknumber);

            foreach (var part in parts)
            {
                SetParticleSystem(part, rules);
            }
        }

        public void llParticleSystem(LSL_List rules)
        {
            m_host.AddScriptLPS(1);
            SetParticleSystem(m_host, rules);
        }

        private void SetParticleSystem(SceneObjectPart part, LSL_List rules) {

       
            if (rules.Length == 0)
            {
                part.RemoveParticleSystem();
                part.ParentGroup.HasGroupChanged = true;
            }
            else
            {
                Primitive.ParticleSystem prules = getNewParticleSystemWithSLDefaultValues();
                LSL_Vector tempv = new LSL_Vector();

                float tempf = 0;

                for (int i = 0; i < rules.Length; i += 2)
                {
                    switch (rules.GetLSLIntegerItem(i))
                    {
                        case (int)ScriptBaseClass.PSYS_PART_FLAGS:
                            prules.PartDataFlags = (Primitive.ParticleSystem.ParticleDataFlags)(uint)rules.GetLSLIntegerItem(i + 1);
                            break;

                        case (int)ScriptBaseClass.PSYS_PART_START_COLOR:
                            tempv = rules.GetVector3Item(i + 1);
                            prules.PartStartColor.R = (float)tempv.x;
                            prules.PartStartColor.G = (float)tempv.y;
                            prules.PartStartColor.B = (float)tempv.z;
                            break;

                        case (int)ScriptBaseClass.PSYS_PART_START_ALPHA:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.PartStartColor.A = tempf;
                            break;

                        case (int)ScriptBaseClass.PSYS_PART_END_COLOR:
                            tempv = rules.GetVector3Item(i + 1);
                            prules.PartEndColor.R = (float)tempv.x;
                            prules.PartEndColor.G = (float)tempv.y;
                            prules.PartEndColor.B = (float)tempv.z;
                            break;

                        case (int)ScriptBaseClass.PSYS_PART_END_ALPHA:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.PartEndColor.A = tempf;
                            break;

                        case (int)ScriptBaseClass.PSYS_PART_START_SCALE:
                            tempv = rules.GetVector3Item(i + 1);
                            prules.PartStartScaleX = (float)tempv.x;
                            prules.PartStartScaleY = (float)tempv.y;
                            break;

                        case (int)ScriptBaseClass.PSYS_PART_END_SCALE:
                            tempv = rules.GetVector3Item(i + 1);
                            prules.PartEndScaleX = (float)tempv.x;
                            prules.PartEndScaleY = (float)tempv.y;
                            break;

                        case (int)ScriptBaseClass.PSYS_PART_MAX_AGE:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.PartMaxAge = tempf;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_ACCEL:
                            tempv = rules.GetVector3Item(i + 1);
                            prules.PartAcceleration.X = (float)tempv.x;
                            prules.PartAcceleration.Y = (float)tempv.y;
                            prules.PartAcceleration.Z = (float)tempv.z;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_PATTERN:
                            int tmpi = (int)rules.GetLSLIntegerItem(i + 1);
                            prules.Pattern = (Primitive.ParticleSystem.SourcePattern)tmpi;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_TEXTURE:
                            prules.Texture = KeyOrName(rules.GetLSLStringItem(i + 1));
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_BURST_RATE:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.BurstRate = (float)tempf;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_BURST_PART_COUNT:
                            prules.BurstPartCount = (byte)(int)rules.GetLSLIntegerItem(i + 1);
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_BURST_RADIUS:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.BurstRadius = (float)tempf;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_BURST_SPEED_MIN:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.BurstSpeedMin = (float)tempf;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_BURST_SPEED_MAX:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.BurstSpeedMax = (float)tempf;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_MAX_AGE:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.MaxAge = (float)tempf;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_TARGET_KEY:
                            UUID key = UUID.Zero;
                            if (UUID.TryParse(rules.Data[i + 1].ToString(), out key))
                            {
                                prules.Target = key;
                            }
                            else
                            {
                                prules.Target = part.UUID;
                            }
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_OMEGA:
                            // AL: This is an assumption, since it is the only thing that would match.
                            tempv = rules.GetVector3Item(i + 1);
                            prules.AngularVelocity.X = (float)tempv.x;
                            prules.AngularVelocity.Y = (float)tempv.y;
                            prules.AngularVelocity.Z = (float)tempv.z;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_ANGLE_BEGIN:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.InnerAngle = (float)tempf;
                            break;

                        case (int)ScriptBaseClass.PSYS_SRC_ANGLE_END:
                            tempf = (float)rules.GetLSLFloatItem(i + 1);
                            prules.OuterAngle = (float)tempf;
                            break;
                    }

                }
                prules.CRC = 1;

                part.AddNewParticleSystem(prules);
                part.ParentGroup.HasGroupChanged = true;
            }
            part.SendFullUpdateToAllClients();
        }

        public void llGroundRepel(double height, int water, double tau)
        {
            m_host.AddScriptLPS(1);
            if (m_host.PhysActor != null)
            {
                float ground = (float)llGround(new LSL_Types.Vector3(0, 0, 0));
                float waterLevel = (float)llWater(new LSL_Types.Vector3(0, 0, 0)); 
                PIDHoverType hoverType = PIDHoverType.Ground;
                if (water != 0)
                {
                    hoverType = PIDHoverType.GroundAndWater;
                    if (ground < waterLevel)
                        height += waterLevel;
                    else
                        height += ground;
                }
                else
                {
                    height += ground;
                }
                
                m_host.SetHoverHeight((float)height, hoverType, (float)tau);
            }
        }

        protected UUID GetTaskInventoryItem(string name)
        {
            m_host.TaskInventory.LockItemsForRead(true);
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Name == name)
                {
                    m_host.TaskInventory.LockItemsForRead(false);
                    return inv.Key;
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            return UUID.Zero;
        }

        public void llGiveInventoryList(string destination, string category, LSL_List inventory)
        {
            m_host.AddScriptLPS(1);

            UUID destID;
            if (!UUID.TryParse(destination, out destID))
                return;

            List<UUID> itemList = new List<UUID>();

            foreach (Object item in inventory.Data)
            {
                UUID itemID;
                if (UUID.TryParse(item.ToString(), out itemID))
                {
                    itemList.Add(itemID);
                }
                else
                {
                    itemID = GetTaskInventoryItem(item.ToString());
                    if (itemID != UUID.Zero)
                        itemList.Add(itemID);
                }
            }

            if (itemList.Count == 0)
                return;

            UUID folderID = m_ScriptEngine.World.MoveTaskInventoryItems(destID, category, m_host, itemList);

            if (folderID == UUID.Zero)
                return;

            byte[] bucket = new byte[17];
            bucket[0] = (byte)AssetType.Folder;
            byte[] objBytes = folderID.GetBytes();
            Array.Copy(objBytes, 0, bucket, 1, 16);

            GridInstantMessage msg = new GridInstantMessage(World,
                    m_host.UUID, m_host.Name+", an object owned by "+
                    resolveName(m_host.OwnerID)+",", destID,
                    (byte)InstantMessageDialog.InventoryOffered,
                    false, category+"\n"+m_host.Name+" is located at "+
                    World.RegionInfo.RegionName+" "+
                    m_host.AbsolutePosition.ToString(),
                    folderID, true, m_host.AbsolutePosition,
                    bucket);

            if (m_TransferModule != null)
                m_TransferModule.SendInstantMessage(msg, delegate(bool success) {});
        }

        public void llSetVehicleType(int type)
        {
            m_host.AddScriptLPS(1);
            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    m_host.ParentGroup.RootPart.SetVehicleType(type);
                }
            }
        }

        //CFK 9/28: Most, but not all of the underlying plumbing between here and the physics modules is in
        //CFK 9/28: so these are not complete yet.
        public void llSetVehicleFloatParam(int param, LSL_Float value)
        {
            m_host.AddScriptLPS(1);

            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    m_host.ParentGroup.RootPart.SetVehicleFloatParam(param, (float)value);
                }
            }
        }

        //CFK 9/28: Most, but not all of the underlying plumbing between here and the physics modules is in
        //CFK 9/28: so these are not complete yet.
        public void llSetVehicleVectorParam(int param, LSL_Vector vec)
        {
            m_host.AddScriptLPS(1);
            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    m_host.ParentGroup.RootPart.SetVehicleVectorParam(param,
                        new Vector3((float)vec.x, (float)vec.y, (float)vec.z));
                }
            }
        }

        //CFK 9/28: Most, but not all of the underlying plumbing between here and the physics modules is in
        //CFK 9/28: so these are not complete yet.
        public void llSetVehicleRotationParam(int param, LSL_Rotation rot)
        {
            m_host.AddScriptLPS(1);
            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    m_host.ParentGroup.RootPart.SetVehicleRotationParam(param,
                        Rot2Quaternion(rot));
                }
            }
        }

        public void llSetVehicleFlags(int flags)
        {
            m_host.AddScriptLPS(1);
            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    m_host.ParentGroup.RootPart.SetVehicleFlags(flags, false);
                }
            }
        }

        public void llRemoveVehicleFlags(int flags)
        {
            m_host.AddScriptLPS(1);
            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    m_host.ParentGroup.RootPart.SetVehicleFlags(flags, true);
                }
            }
        }

        public void llSitTarget(LSL_Vector offset, LSL_Rotation rot)
        {
            m_host.AddScriptLPS(1);
            // LSL quaternions can normalize to 0, normal Quaternions can't.
            if (rot.s == 0 && rot.x == 0 && rot.y == 0 && rot.z == 0)
                rot.z = 1; // ZERO_ROTATION = 0,0,0,1

            m_host.SitTargetPosition = new Vector3((float)offset.x, (float)offset.y, (float)offset.z);
            m_host.SitTargetOrientation = Rot2Quaternion(rot);
            m_host.ParentGroup.HasGroupChanged = true;
        }

        public LSL_String llAvatarOnSitTarget()
        {
            m_host.AddScriptLPS(1);
            return m_host.GetAvatarOnSitTarget().ToString();
        }

        public void llAddToLandPassList(string avatar, double hours)
        {
            m_host.AddScriptLPS(1);
            UUID key;
            LandData land = World.LandChannel.GetLandObject(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).LandData;
            if (land.OwnerID == m_host.OwnerID)
            {
                ParcelManager.ParcelAccessEntry entry = new ParcelManager.ParcelAccessEntry();
                if (UUID.TryParse(avatar, out key))
                {
                    entry.AgentID = key;
                    entry.Flags = AccessList.Access;
                    entry.Time = DateTime.Now.AddHours(hours);
                    land.ParcelAccessList.Add(entry);
                }
            }
            ScriptSleep(100);
        }

        public void llSetTouchText(string text)
        {
            m_host.AddScriptLPS(1);
            m_host.TouchName = text;
        }

        public void llSetSitText(string text)
        {
            m_host.AddScriptLPS(1);
            m_host.SitName = text;
        }

        public void llSetCameraEyeOffset(LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            m_host.SetCameraEyeOffset(new Vector3((float)offset.x, (float)offset.y, (float)offset.z));
        }

        public void llSetCameraAtOffset(LSL_Vector offset)
        {
            m_host.AddScriptLPS(1);
            m_host.SetCameraAtOffset(new Vector3((float)offset.x, (float)offset.y, (float)offset.z));
        }

        public LSL_String llDumpList2String(LSL_List src, string seperator)
        {
            m_host.AddScriptLPS(1);
            if (src.Length == 0)
            {
                return String.Empty;
            }
            string ret = String.Empty;
            foreach (object o in src.Data)
            {
                ret = ret + o.ToString() + seperator;
            }
            ret = ret.Substring(0, ret.Length - seperator.Length);
            return ret;
        }

        public LSL_Integer llScriptDanger(LSL_Vector pos)
        {
            m_host.AddScriptLPS(1);
            bool result = World.ScriptDanger(m_host.LocalId, new Vector3((float)pos.x, (float)pos.y, (float)pos.z));
            if (result)
            {
                return 1;
            }
            else
            {
                return 0;
            }

        }

        public void llDialog(string avatar, string message, LSL_List buttons, int chat_channel)
        {
            IDialogModule dm = World.RequestModuleInterface<IDialogModule>();

            if (dm == null)
                return;

            m_host.AddScriptLPS(1);
            UUID av = new UUID();
            if (!UUID.TryParse(avatar,out av))
            {
                LSLError("First parameter to llDialog needs to be a key");
                return;
            }
            if (buttons.Length < 1)
            {
                LSLError("No less than 1 button can be shown");
                return;
            }
            if (buttons.Length > 12)
            {
                LSLError("No more than 12 buttons can be shown");
                return;
            }
            string[] buts = new string[buttons.Length];
            for (int i = 0; i < buttons.Length; i++)
            {
                if (buttons.Data[i].ToString() == String.Empty)
                {
                    LSLError("button label cannot be blank");
                    return;
                }
                if (buttons.Data[i].ToString().Length > 24)
                {
                    LSLError("button label cannot be longer than 24 characters");
                    return;
                }
                buts[i] = buttons.Data[i].ToString();
            }

            dm.SendDialogToUser(
                av, m_host.Name, m_host.UUID, m_host.OwnerID,
                message, new UUID("00000000-0000-2222-3333-100000001000"), chat_channel, buts);

            ScriptSleep(1000);
        }

        public void llVolumeDetect(int detect)
        {
            m_host.AddScriptLPS(1);
            if (m_host.ParentGroup != null)
            {
                if (!m_host.ParentGroup.IsDeleted)
                {
                    m_host.ParentGroup.RootPart.ScriptSetVolumeDetect(detect!=0);
                }
            }
        }

        /// <summary>
        /// This is a depecated function so this just replicates the result of
        /// invoking it in SL
        /// </summary>

        public void llRemoteLoadScript(string target, string name, int running, int start_param)
        {
            m_host.AddScriptLPS(1);
            // Report an error as it does in SL
            ShoutError("Deprecated. Please use llRemoteLoadScriptPin instead.");
            ScriptSleep(3000);
        }

        public void llSetRemoteScriptAccessPin(int pin)
        {
            m_host.AddScriptLPS(1);
            m_host.ScriptAccessPin = pin;
        }

        public void llRemoteLoadScriptPin(string target, string name, int pin, int running, int start_param)
        {
            m_host.AddScriptLPS(1);
            bool found = false;
            UUID destId = UUID.Zero;
            UUID srcId = UUID.Zero;

            if (!UUID.TryParse(target, out destId))
            {
                llSay(0, "Could not parse key " + target);
                return;
            }

            // target must be a different prim than the one containing the script
            if (m_host.UUID == destId)
            {
                return;
            }

            // copy the first script found with this inventory name
            m_host.TaskInventory.LockItemsForRead(true);
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Name == name)
                {
                    // make sure the object is a script
                    if (10 == inv.Value.Type)
                    {
                        found = true;
                        srcId = inv.Key;
                        break;
                    }
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            if (!found)
            {
                llSay(0, "Could not find script " + name);
                return;
            }

            // the rest of the permission checks are done in RezScript, so check the pin there as well
            World.RezScript(srcId, m_host, destId, pin, running, start_param);
            // this will cause the delay even if the script pin or permissions were wrong - seems ok
            ScriptSleep(3000);
        }

        public void llOpenRemoteDataChannel()
        {
            m_host.AddScriptLPS(1);
            IXMLRPC xmlrpcMod = m_ScriptEngine.World.RequestModuleInterface<IXMLRPC>();
            if (xmlrpcMod.IsEnabled())
            {
                UUID channelID = xmlrpcMod.OpenXMLRPCChannel(m_localID, m_itemID, UUID.Zero);
                IXmlRpcRouter xmlRpcRouter = m_ScriptEngine.World.RequestModuleInterface<IXmlRpcRouter>();
                if (xmlRpcRouter != null)
                {
                    string ExternalHostName = m_ScriptEngine.World.RegionInfo.ExternalHostName;
                    
                    xmlRpcRouter.RegisterNewReceiver(m_ScriptEngine.ScriptModule, channelID, m_host.UUID, 
                                                     m_itemID, String.Format("http://{0}:{1}/", ExternalHostName, 
                                                                             xmlrpcMod.Port.ToString()));
                }
                object[] resobj = new object[] 
                    { 
                        new LSL_Integer(1), 
                        new LSL_String(channelID.ToString()), 
                        new LSL_String(UUID.Zero.ToString()), 
                        new LSL_String(String.Empty), 
                        new LSL_Integer(0), 
                        new LSL_String(String.Empty) 
                    };
                m_ScriptEngine.PostScriptEvent(m_itemID, new EventParams("remote_data", resobj,
                                                                         new DetectParams[0]));
            }
            ScriptSleep(1000);
        }

        public LSL_String llSendRemoteData(string channel, string dest, int idata, string sdata)
        {
            m_host.AddScriptLPS(1);
            IXMLRPC xmlrpcMod = m_ScriptEngine.World.RequestModuleInterface<IXMLRPC>();
            ScriptSleep(3000);
            return (xmlrpcMod.SendRemoteData(m_localID, m_itemID, channel, dest, idata, sdata)).ToString();
        }

        public void llRemoteDataReply(string channel, string message_id, string sdata, int idata)
        {
            m_host.AddScriptLPS(1);
            IXMLRPC xmlrpcMod = m_ScriptEngine.World.RequestModuleInterface<IXMLRPC>();
            xmlrpcMod.RemoteDataReply(channel, message_id, sdata, idata);
            ScriptSleep(3000);
        }

        public void llCloseRemoteDataChannel(string channel)
        {
            m_host.AddScriptLPS(1);
            IXMLRPC xmlrpcMod = m_ScriptEngine.World.RequestModuleInterface<IXMLRPC>();
            xmlrpcMod.CloseXMLRPCChannel((UUID)channel);
            ScriptSleep(1000);
        }

        public LSL_String llMD5String(string src, int nonce)
        {
            m_host.AddScriptLPS(1);
            return Util.Md5Hash(String.Format("{0}:{1}", src, nonce.ToString()));
        }

        public LSL_String llSHA1String(string src)
        {
            m_host.AddScriptLPS(1);
            return Util.SHA1Hash(src).ToLower();
        }

        protected ObjectShapePacket.ObjectDataBlock SetPrimitiveBlockShapeParams(SceneObjectPart part, int holeshape, LSL_Vector cut, float hollow, LSL_Vector twist)
        {
            ObjectShapePacket.ObjectDataBlock shapeBlock = new ObjectShapePacket.ObjectDataBlock();
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return shapeBlock;

            if (holeshape != (int)ScriptBaseClass.PRIM_HOLE_DEFAULT &&
                holeshape != (int)ScriptBaseClass.PRIM_HOLE_CIRCLE &&
                holeshape != (int)ScriptBaseClass.PRIM_HOLE_SQUARE &&
                holeshape != (int)ScriptBaseClass.PRIM_HOLE_TRIANGLE)
            {
                holeshape = (int)ScriptBaseClass.PRIM_HOLE_DEFAULT;
            }
            shapeBlock.ProfileCurve = (byte)holeshape;
            if (cut.x < 0f)
            {
                cut.x = 0f;
            }
            if (cut.x > 1f)
            {
                cut.x = 1f;
            }
            if (cut.y < 0f)
            {
                cut.y = 0f;
            }
            if (cut.y > 1f)
            {
                cut.y = 1f;
            }
            if (cut.y - cut.x < 0.05f)
            {
                cut.x = cut.y - 0.05f;
            }
            shapeBlock.ProfileBegin = (ushort)(50000 * cut.x);
            shapeBlock.ProfileEnd = (ushort)(50000 * (1 - cut.y));
            if (hollow < 0f)
            {
                hollow = 0f;
            }
            if (hollow > 0.95)
            {
                hollow = 0.95f;
            }
            shapeBlock.ProfileHollow = (ushort)(50000 * hollow);
            if (twist.x < -1.0f)
            {
                twist.x = -1.0f;
            }
            if (twist.x > 1.0f)
            {
                twist.x = 1.0f;
            }
            if (twist.y < -1.0f)
            {
                twist.y = -1.0f;
            }
            if (twist.y > 1.0f)
            {
                twist.y = 1.0f;
            }
            shapeBlock.PathTwistBegin = (sbyte)(100 * twist.x);
            shapeBlock.PathTwist = (sbyte)(100 * twist.y);

            shapeBlock.ObjectLocalID = part.LocalId;

            // retain pathcurve
            shapeBlock.PathCurve = part.Shape.PathCurve;

            part.Shape.SculptEntry = false;
            return shapeBlock;
        }

        protected void SetPrimitiveShapeParams(SceneObjectPart part, int holeshape, LSL_Vector cut, float hollow, LSL_Vector twist, LSL_Vector taper_b, LSL_Vector topshear, byte fudge)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            ObjectShapePacket.ObjectDataBlock shapeBlock;

            shapeBlock = SetPrimitiveBlockShapeParams(part, holeshape, cut, hollow, twist);

            shapeBlock.ProfileCurve += fudge;

            if (taper_b.x < 0f)
            {
                taper_b.x = 0f;
            }
            if (taper_b.x > 2f)
            {
                taper_b.x = 2f;
            }
            if (taper_b.y < 0f)
            {
                taper_b.y = 0f;
            }
            if (taper_b.y > 2f)
            {
                taper_b.y = 2f;
            }
            shapeBlock.PathScaleX = (byte)(100 * (2.0 - taper_b.x));
            shapeBlock.PathScaleY = (byte)(100 * (2.0 - taper_b.y));
            if (topshear.x < -0.5f)
            {
                topshear.x = -0.5f;
            }
            if (topshear.x > 0.5f)
            {
                topshear.x = 0.5f;
            }
            if (topshear.y < -0.5f)
            {
                topshear.y = -0.5f;
            }
            if (topshear.y > 0.5f)
            {
                topshear.y = 0.5f;
            }
            shapeBlock.PathShearX = (byte)(100 * topshear.x);
            shapeBlock.PathShearY = (byte)(100 * topshear.y);

            part.Shape.SculptEntry = false;
            part.UpdateShape(shapeBlock);
        }

        protected void SetPrimitiveShapeParams(SceneObjectPart part, int holeshape, LSL_Vector cut, float hollow, LSL_Vector twist, LSL_Vector dimple, byte fudge)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            ObjectShapePacket.ObjectDataBlock shapeBlock;

            shapeBlock = SetPrimitiveBlockShapeParams(part, holeshape, cut, hollow, twist);

            // profile/path swapped for a sphere
            shapeBlock.PathBegin = shapeBlock.ProfileBegin;
            shapeBlock.PathEnd = shapeBlock.ProfileEnd;

            shapeBlock.ProfileCurve += fudge;

            shapeBlock.PathScaleX = 100;
            shapeBlock.PathScaleY = 100;

            if (dimple.x < 0f)
            {
                dimple.x = 0f;
            }
            if (dimple.x > 1f)
            {
                dimple.x = 1f;
            }
            if (dimple.y < 0f)
            {
                dimple.y = 0f;
            }
            if (dimple.y > 1f)
            {
                dimple.y = 1f;
            }
            if (dimple.y - cut.x < 0.05f)
            {
                dimple.x = cut.y - 0.05f;
            }
            shapeBlock.ProfileBegin = (ushort)(50000 * dimple.x);
            shapeBlock.ProfileEnd   = (ushort)(50000 * (1 - dimple.y));

            part.Shape.SculptEntry = false;
            part.UpdateShape(shapeBlock);
        }

        protected void SetPrimitiveShapeParams(SceneObjectPart part, int holeshape, LSL_Vector cut, float hollow, LSL_Vector twist, LSL_Vector holesize, LSL_Vector topshear, LSL_Vector profilecut, LSL_Vector taper_a, float revolutions, float radiusoffset, float skew, byte fudge)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            ObjectShapePacket.ObjectDataBlock shapeBlock;

            shapeBlock = SetPrimitiveBlockShapeParams(part, holeshape, cut, hollow, twist);

            shapeBlock.ProfileCurve += fudge;

            // profile/path swapped for a torrus, tube, ring
            shapeBlock.PathBegin = shapeBlock.ProfileBegin;
            shapeBlock.PathEnd = shapeBlock.ProfileEnd;

            if (holesize.x < 0.05f)
            {
                holesize.x = 0.05f;
            }
            if (holesize.x > 1f)
            {
                holesize.x = 1f;
            }
            if (holesize.y < 0.05f)
            {
                holesize.y = 0.05f;
            }
            if (holesize.y > 0.5f)
            {
                holesize.y = 0.5f;
            }
            shapeBlock.PathScaleX = (byte)(100 * (2 - holesize.x));
            shapeBlock.PathScaleY = (byte)(100 * (2 - holesize.y));
            if (topshear.x < -0.5f)
            {
                topshear.x = -0.5f;
            }
            if (topshear.x > 0.5f)
            {
                topshear.x = 0.5f;
            }
            if (topshear.y < -0.5f)
            {
                topshear.y = -0.5f;
            }
            if (topshear.y > 0.5f)
            {
                topshear.y = 0.5f;
            }
            shapeBlock.PathShearX = (byte)(100 * topshear.x);
            shapeBlock.PathShearY = (byte)(100 * topshear.y);
            if (profilecut.x < 0f)
            {
                profilecut.x = 0f;
            }
            if (profilecut.x > 1f)
            {
                profilecut.x = 1f;
            }
            if (profilecut.y < 0f)
            {
                profilecut.y = 0f;
            }
            if (profilecut.y > 1f)
            {
                profilecut.y = 1f;
            }
            if (profilecut.y - cut.x < 0.05f)
            {
                profilecut.x = cut.y - 0.05f;
            }
            shapeBlock.ProfileBegin = (ushort)(50000 * profilecut.x);
            shapeBlock.ProfileEnd = (ushort)(50000 * (1 - profilecut.y));
            if (taper_a.x < -1f)
            {
                taper_a.x = -1f;
            }
            if (taper_a.x > 1f)
            {
                taper_a.x = 1f;
            }
            if (taper_a.y < -1f)
            {
                taper_a.y = -1f;
            }
            if (taper_a.y > 1f)
            {
                taper_a.y = 1f;
            }
            shapeBlock.PathTaperX = (sbyte)(100 * taper_a.x);
            shapeBlock.PathTaperY = (sbyte)(100 * taper_a.y);
            if (revolutions < 1f)
            {
                revolutions = 1f;
            }
            if (revolutions > 4f)
            {
                revolutions = 4f;
            }
            shapeBlock.PathRevolutions = (byte)(66.666667 * (revolutions - 1.0));
            // limits on radiusoffset depend on revolutions and hole size (how?) seems like the maximum range is 0 to 1
            if (radiusoffset < 0f)
            {
                radiusoffset = 0f;
            }
            if (radiusoffset > 1f)
            {
                radiusoffset = 1f;
            }
            shapeBlock.PathRadiusOffset = (sbyte)(100 * radiusoffset);
            if (skew < -0.95f)
            {
                skew = -0.95f;
            }
            if (skew > 0.95f)
            {
                skew = 0.95f;
            }
            shapeBlock.PathSkew = (sbyte)(100 * skew);

            part.Shape.SculptEntry = false;
            part.UpdateShape(shapeBlock);
        }

        protected void SetPrimitiveShapeParams(SceneObjectPart part, string map, int type)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            ObjectShapePacket.ObjectDataBlock shapeBlock = new ObjectShapePacket.ObjectDataBlock();
            UUID sculptId;

            if (!UUID.TryParse(map, out sculptId))
            {
                sculptId = InventoryKey(map, (int)AssetType.Texture);
            }

            if (sculptId == UUID.Zero)
                return;

            shapeBlock.ObjectLocalID = part.LocalId;
            shapeBlock.PathScaleX = 100;
            shapeBlock.PathScaleY = 150;

            if (type != (int)ScriptBaseClass.PRIM_SCULPT_TYPE_CYLINDER &&
                type != (int)ScriptBaseClass.PRIM_SCULPT_TYPE_PLANE &&
                type != (int)ScriptBaseClass.PRIM_SCULPT_TYPE_SPHERE &&
                type != (int)ScriptBaseClass.PRIM_SCULPT_TYPE_TORUS)
            {
                // default
                type = (int)ScriptBaseClass.PRIM_SCULPT_TYPE_SPHERE;
            }

            // retain pathcurve
            shapeBlock.PathCurve = part.Shape.PathCurve;

            part.Shape.SetSculptData((byte)type, sculptId);
            part.Shape.SculptEntry = true;
            part.UpdateShape(shapeBlock);
        }

        public void llSetPrimitiveParams(LSL_List rules)
        {
            m_host.AddScriptLPS(1);
            SetPrimParams(m_host, rules);
        }

        public void llSetLinkPrimitiveParams(int linknumber, LSL_List rules)
        {
             m_host.AddScriptLPS(1);

            List<SceneObjectPart> parts = GetLinkParts(linknumber);

            foreach (SceneObjectPart part in parts)
                SetPrimParams(part, rules);
        }

        public void llSetLinkPrimitiveParamsFast(int linknumber, LSL_List rules)
        {
            llSetLinkPrimitiveParams(linknumber, rules);
        }

        protected void SetPrimParams(SceneObjectPart part, LSL_List rules)
        {
            if (part == null || part.ParentGroup == null || part.ParentGroup.IsDeleted)
                return;

            int idx = 0;

            while (idx < rules.Length)
            {
                int code = rules.GetLSLIntegerItem(idx++);

                int remain = rules.Length - idx;

                int face;
                LSL_Vector v;

                switch (code)
                {
                    case (int)ScriptBaseClass.PRIM_POSITION:
                        if (remain < 1)
                            return;

                        v=rules.GetVector3Item(idx++);
                        SetPos(part, v);

                        break;
                    case (int)ScriptBaseClass.PRIM_SIZE:
                        if (remain < 1)
                            return;

                        v=rules.GetVector3Item(idx++);
                        SetScale(part, v);

                        break;
                    case (int)ScriptBaseClass.PRIM_ROTATION:
                        if (remain < 1)
                            return;

                        LSL_Rotation q = rules.GetQuaternionItem(idx++);
                        // try to let this work as in SL...
                        if (part.ParentID == 0)
                        {
                            // special case: If we are root, rotate complete SOG to new rotation
                            SetRot(part, Rot2Quaternion(q));
                        }
                        else
                        {
                            // we are a child. The rotation values will be set to the one of root modified by rot, as in SL. Don't ask.
                            SceneObjectGroup group = part.ParentGroup;
                            if (group != null) // a bit paranoid, maybe
                            {
                                SceneObjectPart rootPart = group.RootPart;
                                if (rootPart != null) // again, better safe than sorry
                                {
                                    SetRot(part, rootPart.RotationOffset * Rot2Quaternion(q));
                                }
                            }
                        }

                        break;

                    case (int)ScriptBaseClass.PRIM_TYPE:
                        if (remain < 3)
                            return;

                        code = (int)rules.GetLSLIntegerItem(idx++);

                        remain = rules.Length - idx;
                        float hollow;
                        LSL_Vector twist;
                        LSL_Vector taper_b;
                        LSL_Vector topshear;
                        float revolutions;
                        float radiusoffset;
                        float skew;
                        LSL_Vector holesize;
                        LSL_Vector profilecut;

                        switch (code)
                        {
                            case (int)ScriptBaseClass.PRIM_TYPE_BOX:
                                if (remain < 6)
                                    return;

                                face = (int)rules.GetLSLIntegerItem(idx++);
                                v = rules.GetVector3Item(idx++); // cut
                                hollow = (float)rules.GetLSLFloatItem(idx++);
                                twist = rules.GetVector3Item(idx++);
                                taper_b = rules.GetVector3Item(idx++);
                                topshear = rules.GetVector3Item(idx++);

                                part.Shape.PathCurve = (byte)Extrusion.Straight;
                                SetPrimitiveShapeParams(part, face, v, hollow, twist, taper_b, topshear, 1);
                                break;

                            case (int)ScriptBaseClass.PRIM_TYPE_CYLINDER:
                                if (remain < 6)
                                    return;

                                face = (int)rules.GetLSLIntegerItem(idx++); // holeshape
                                v = rules.GetVector3Item(idx++); // cut
                                hollow = (float)rules.GetLSLFloatItem(idx++);
                                twist = rules.GetVector3Item(idx++);
                                taper_b = rules.GetVector3Item(idx++);
                                topshear = rules.GetVector3Item(idx++);
                                part.Shape.ProfileShape = ProfileShape.Circle;
                                part.Shape.PathCurve = (byte)Extrusion.Straight;
                                SetPrimitiveShapeParams(part, face, v, hollow, twist, taper_b, topshear, 0);
                                break;

                            case (int)ScriptBaseClass.PRIM_TYPE_PRISM:
                                if (remain < 6)
                                    return;

                                face = (int)rules.GetLSLIntegerItem(idx++); // holeshape
                                v = rules.GetVector3Item(idx++); //cut
                                hollow = (float)rules.GetLSLFloatItem(idx++);
                                twist = rules.GetVector3Item(idx++);
                                taper_b = rules.GetVector3Item(idx++);
                                topshear = rules.GetVector3Item(idx++);
                                part.Shape.PathCurve = (byte)Extrusion.Straight;
                                SetPrimitiveShapeParams(part, face, v, hollow, twist, taper_b, topshear, 3);
                                break;

                            case (int)ScriptBaseClass.PRIM_TYPE_SPHERE:
                                if (remain < 5)
                                    return;

                                face = (int)rules.GetLSLIntegerItem(idx++); // holeshape
                                v = rules.GetVector3Item(idx++); // cut
                                hollow = (float)rules.GetLSLFloatItem(idx++);
                                twist = rules.GetVector3Item(idx++);
                                taper_b = rules.GetVector3Item(idx++); // dimple
                                part.Shape.PathCurve = (byte)Extrusion.Curve1;
                                SetPrimitiveShapeParams(part, face, v, hollow, twist, taper_b, 5);
                                break;

                            case (int)ScriptBaseClass.PRIM_TYPE_TORUS:
                                if (remain < 11)
                                    return;

                                face = (int)rules.GetLSLIntegerItem(idx++); // holeshape
                                v = rules.GetVector3Item(idx++); //cut
                                hollow = (float)rules.GetLSLFloatItem(idx++);
                                twist = rules.GetVector3Item(idx++);
                                holesize = rules.GetVector3Item(idx++);
                                topshear = rules.GetVector3Item(idx++);
                                profilecut = rules.GetVector3Item(idx++);
                                taper_b = rules.GetVector3Item(idx++); // taper_a
                                revolutions = (float)rules.GetLSLFloatItem(idx++);
                                radiusoffset = (float)rules.GetLSLFloatItem(idx++);
                                skew = (float)rules.GetLSLFloatItem(idx++);
                                part.Shape.PathCurve = (byte)Extrusion.Curve1;
                                SetPrimitiveShapeParams(part, face, v, hollow, twist, holesize, topshear, profilecut, taper_b, 
                                                        revolutions, radiusoffset, skew, 0);
                                break;

                            case (int)ScriptBaseClass.PRIM_TYPE_TUBE:
                                if (remain < 11)
                                    return;

                                face = (int)rules.GetLSLIntegerItem(idx++); // holeshape
                                v = rules.GetVector3Item(idx++); //cut
                                hollow = (float)rules.GetLSLFloatItem(idx++);
                                twist = rules.GetVector3Item(idx++);
                                holesize = rules.GetVector3Item(idx++);
                                topshear = rules.GetVector3Item(idx++);
                                profilecut = rules.GetVector3Item(idx++);
                                taper_b = rules.GetVector3Item(idx++); // taper_a
                                revolutions = (float)rules.GetLSLFloatItem(idx++);
                                radiusoffset = (float)rules.GetLSLFloatItem(idx++);
                                skew = (float)rules.GetLSLFloatItem(idx++);
                                part.Shape.PathCurve = (byte)Extrusion.Curve1;
                                SetPrimitiveShapeParams(part, face, v, hollow, twist, holesize, topshear, profilecut, taper_b, 
                                                        revolutions, radiusoffset, skew, 1);
                                break;

                            case (int)ScriptBaseClass.PRIM_TYPE_RING:
                                if (remain < 11)
                                    return;

                                face = (int)rules.GetLSLIntegerItem(idx++); // holeshape
                                v = rules.GetVector3Item(idx++); //cut
                                hollow = (float)rules.GetLSLFloatItem(idx++);
                                twist = rules.GetVector3Item(idx++);
                                holesize = rules.GetVector3Item(idx++);
                                topshear = rules.GetVector3Item(idx++);
                                profilecut = rules.GetVector3Item(idx++);
                                taper_b = rules.GetVector3Item(idx++); // taper_a
                                revolutions = (float)rules.GetLSLFloatItem(idx++);
                                radiusoffset = (float)rules.GetLSLFloatItem(idx++);
                                skew = (float)rules.GetLSLFloatItem(idx++);
                                part.Shape.PathCurve = (byte)Extrusion.Curve1;
                                SetPrimitiveShapeParams(part, face, v, hollow, twist, holesize, topshear, profilecut, taper_b, 
                                                        revolutions, radiusoffset, skew, 3);
                                break;

                            case (int)ScriptBaseClass.PRIM_TYPE_SCULPT:
                                if (remain < 2)
                                    return;

                                string map = rules.Data[idx++].ToString();
                                face = (int)rules.GetLSLIntegerItem(idx++); // type
                                part.Shape.PathCurve = (byte)Extrusion.Curve1;
                                SetPrimitiveShapeParams(part, map, face);
                                break;
                        }

                        break;

                    case (int)ScriptBaseClass.PRIM_TEXTURE:
                        if (remain < 5)
                            return;

                        face=(int)rules.GetLSLIntegerItem(idx++);
                        string tex=rules.Data[idx++].ToString();
                        LSL_Vector repeats=rules.GetVector3Item(idx++);
                        LSL_Vector offsets=rules.GetVector3Item(idx++);
                        double rotation=(double)rules.GetLSLFloatItem(idx++);

                        SetTexture(part, tex, face);
                        ScaleTexture(part, repeats.x, repeats.y, face);
                        OffsetTexture(part, offsets.x, offsets.y, face);
                        RotateTexture(part, rotation, face);

                        break;

                    case (int)ScriptBaseClass.PRIM_COLOR:
                        if (remain < 3)
                            return;

                        face=(int)rules.GetLSLIntegerItem(idx++);
                        LSL_Vector color=rules.GetVector3Item(idx++);
                        double alpha=(double)rules.GetLSLFloatItem(idx++);

                        part.SetFaceColor(new Vector3((float)color.x, (float)color.y, (float)color.z), face);
                        SetAlpha(part, alpha, face);

                        break;
                    
                    case (int)ScriptBaseClass.PRIM_FLEXIBLE:
                        if (remain < 7)
                            return;

                        bool flexi = rules.GetLSLIntegerItem(idx++);
                        int softness = rules.GetLSLIntegerItem(idx++);
                        float gravity = (float)rules.GetLSLFloatItem(idx++);
                        float friction = (float)rules.GetLSLFloatItem(idx++);
                        float wind = (float)rules.GetLSLFloatItem(idx++);
                        float tension = (float)rules.GetLSLFloatItem(idx++);
                        LSL_Vector force = rules.GetVector3Item(idx++);

                        SetFlexi(part, flexi, softness, gravity, friction, wind, tension, force);

                        break;
                    
                    case (int)ScriptBaseClass.PRIM_POINT_LIGHT:
                        if (remain < 5)
                            return;
                        bool light = rules.GetLSLIntegerItem(idx++);
                        LSL_Vector lightcolor = rules.GetVector3Item(idx++);
                        float intensity = (float)rules.GetLSLFloatItem(idx++);
                        float radius = (float)rules.GetLSLFloatItem(idx++);
                        float falloff = (float)rules.GetLSLFloatItem(idx++);

                        SetPointLight(part, light, lightcolor, intensity, radius, falloff);

                        break;
                    
                    case (int)ScriptBaseClass.PRIM_GLOW:
                        if (remain < 2)
                            return;
                        face = rules.GetLSLIntegerItem(idx++);
                        float glow = (float)rules.GetLSLFloatItem(idx++);

                        SetGlow(part, face, glow);

                        break;
                    
                    case (int)ScriptBaseClass.PRIM_BUMP_SHINY:
                        if (remain < 3)
                            return;
                        face = (int)rules.GetLSLIntegerItem(idx++);
                        int shiny = (int)rules.GetLSLIntegerItem(idx++);
                        Bumpiness bump = (Bumpiness)Convert.ToByte((int)rules.GetLSLIntegerItem(idx++));

                        SetShiny(part, face, shiny, bump);

                        break;
                    
                     case (int)ScriptBaseClass.PRIM_FULLBRIGHT:
                         if (remain < 2)
                             return;
                         face = rules.GetLSLIntegerItem(idx++);
                         bool st = rules.GetLSLIntegerItem(idx++);
                         SetFullBright(part, face , st);
                         break;
                    
                     case (int)ScriptBaseClass.PRIM_MATERIAL:
                         if (remain < 1)
                             return;
                         int mat = rules.GetLSLIntegerItem(idx++);
                         if (mat < 0 || mat > 7)
                             return;

                         part.Material = Convert.ToByte(mat);
                         break;
                    
                     case (int)ScriptBaseClass.PRIM_PHANTOM:
                        if (remain < 1)
                             return;

                         string ph = rules.Data[idx++].ToString();
                         bool phantom;

                         if (ph.Equals("1"))
                             phantom = true;
                         else
                             phantom = false;

                         part.ScriptSetPhantomStatus(phantom);
                         break;
                    
                     case (int)ScriptBaseClass.PRIM_PHYSICS:
                        if (remain < 1)
                             return;
                         string phy = rules.Data[idx++].ToString();
                         bool physics;

                         if (phy.Equals("1"))
                             physics = true;
                         else
                             physics = false;

                         part.ScriptSetPhysicsStatus(physics);
                         break;
                    
                    case (int)ScriptBaseClass.PRIM_TEMP_ON_REZ:
                        if (remain < 1)
                            return;
                        string temp = rules.Data[idx++].ToString();
                        bool tempOnRez;

                        if (temp.Equals("1"))
                            tempOnRez = true;
                        else
                            tempOnRez = false;

                        part.ScriptSetTemporaryStatus(tempOnRez);
                        break;

                    case (int)ScriptBaseClass.PRIM_TEXGEN:
                        if (remain < 2)
                            return;
                            //face,type
                        face = rules.GetLSLIntegerItem(idx++);
                        int style = rules.GetLSLIntegerItem(idx++);
                        SetTexGen(part, face, style);
                        break;
                    case (int)ScriptBaseClass.PRIM_TEXT:
                        if (remain < 3)
                            return;
                        string primText = rules.GetLSLStringItem(idx++);
                        LSL_Vector primTextColor = rules.GetVector3Item(idx++);
                        LSL_Float primTextAlpha = rules.GetLSLFloatItem(idx++);
                        Vector3 av3 = new Vector3(Util.Clip((float)primTextColor.x, 0.0f, 1.0f),
                                      Util.Clip((float)primTextColor.y, 0.0f, 1.0f),
                                      Util.Clip((float)primTextColor.z, 0.0f, 1.0f));
                        part.SetText(primText, av3, Util.Clip((float)primTextAlpha, 0.0f, 1.0f));

                        break;
                }
            }
        }

        public LSL_String llStringToBase64(string str)
        {
            m_host.AddScriptLPS(1);
            try
            {
                byte[] encData_byte = new byte[str.Length];
                encData_byte = Util.UTF8.GetBytes(str);
                string encodedData = Convert.ToBase64String(encData_byte);
                return encodedData;
            }
            catch (Exception e)
            {
                throw new Exception("Error in base64Encode" + e.Message);
            }
        }

        public LSL_String llBase64ToString(string str)
        {
            m_host.AddScriptLPS(1);
            try
            {
                return Util.Base64ToString(str);
            }
            catch (Exception e)
            {
                throw new Exception("Error in base64Decode" + e.Message);
            }
        }

        public LSL_String llXorBase64Strings(string str1, string str2)
        {
            m_host.AddScriptLPS(1);
            Deprecated("llXorBase64Strings");
            ScriptSleep(300);
            return String.Empty;
        }

        public void llRemoteDataSetRegion()
        {
            m_host.AddScriptLPS(1);
            Deprecated("llRemoteDataSetRegion");
        }

        public LSL_Float llLog10(double val)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Log10(val);
        }

        public LSL_Float llLog(double val)
        {
            m_host.AddScriptLPS(1);
            return (double)Math.Log(val);
        }

        public LSL_List llGetAnimationList(string id)
        {
            m_host.AddScriptLPS(1);

            LSL_List l = new LSL_List();
            ScenePresence av = World.GetScenePresence((UUID)id);
            if (av == null || av.IsChildAgent) // only if in the region
                return l;
            UUID[] anims;
            anims = av.Animator.GetAnimationArray();
            foreach (UUID foo in anims)
                l.Add(foo.ToString());
            return l;
        }

        public void llSetParcelMusicURL(string url)
        {
            m_host.AddScriptLPS(1);

            ILandObject land = World.LandChannel.GetLandObject(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y);

            if (land.LandData.OwnerID != m_host.OwnerID)
                return;

            land.SetMusicUrl(url);

            ScriptSleep(2000);
        }

        public LSL_Vector llGetRootPosition()
        {
            m_host.AddScriptLPS(1);
            return new LSL_Vector(m_host.ParentGroup.AbsolutePosition.X, m_host.ParentGroup.AbsolutePosition.Y, 
                                  m_host.ParentGroup.AbsolutePosition.Z);
        }

        /// <summary>
        /// http://lslwiki.net/lslwiki/wakka.php?wakka=llGetRot
        /// http://lslwiki.net/lslwiki/wakka.php?wakka=ChildRotation
        /// Also tested in sl in regards to the behaviour in attachments/mouselook
        /// In the root prim:-
        ///     Returns the object rotation if not attached
        ///     Returns the avatars rotation if attached
        ///     Returns the camera rotation if attached and the avatar is in mouselook
        /// </summary>
        public LSL_Rotation llGetRootRotation()
        {
            m_host.AddScriptLPS(1);
            Quaternion q;
            if (m_host.ParentGroup.RootPart.AttachmentPoint != 0)
            {
                ScenePresence avatar = World.GetScenePresence(m_host.AttachedAvatar);
                if (avatar != null)
                    if ((avatar.AgentControlFlags & (uint)AgentManager.ControlFlags.AGENT_CONTROL_MOUSELOOK) != 0)
                        q = avatar.CameraRotation; // Mouselook
                    else
                        q = avatar.Rotation; // Currently infrequently updated so may be inaccurate
                else
                    q = m_host.ParentGroup.GroupRotation; // Likely never get here but just in case
            }
            else
                q = m_host.ParentGroup.GroupRotation; // just the group rotation
            return new LSL_Rotation(q.X, q.Y, q.Z, q.W);
        }

        public LSL_String llGetObjectDesc()
        {
            return m_host.Description!=null?m_host.Description:String.Empty;
        }

        public void llSetObjectDesc(string desc)
        {
            m_host.AddScriptLPS(1);
            m_host.Description = desc!=null?desc:String.Empty;
        }

        public LSL_String llGetCreator()
        {
            m_host.AddScriptLPS(1);
            return m_host.CreatorID.ToString();
        }

        public LSL_String llGetTimestamp()
        {
            m_host.AddScriptLPS(1);
            return DateTime.Now.ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ss.fffffffZ");
        }

        public LSL_Integer llGetNumberOfPrims()
        {
            m_host.AddScriptLPS(1);
            int avatarCount = 0;
            World.ForEachScenePresence(delegate(ScenePresence presence)
            {
                if (!presence.IsChildAgent && presence.ParentID != 0 && m_host.ParentGroup.HasChildPrim(presence.ParentID))
                        avatarCount++;
            });

            return m_host.ParentGroup.PrimCount + avatarCount;
        }

        /// <summary>
        /// A partial implementation.
        /// http://lslwiki.net/lslwiki/wakka.php?wakka=llGetBoundingBox
        /// So far only valid for standing/flying/ground sitting avatars and single prim objects.
        /// If the object has multiple prims and/or a sitting avatar then the bounding
        /// box is for the root prim only.
        /// </summary>
        public LSL_List llGetBoundingBox(string obj)
        {
            m_host.AddScriptLPS(1);
            UUID objID = UUID.Zero;
            LSL_List result = new LSL_List();
            if (!UUID.TryParse(obj, out objID))
            {
                result.Add(new LSL_Vector());
                result.Add(new LSL_Vector());
                return result;
            }
            ScenePresence presence = World.GetScenePresence(objID);
            if (presence != null)
            {
                if (presence.ParentID == 0) // not sat on an object
                {
                    LSL_Vector lower;
                    LSL_Vector upper;
                    if (presence.Animator.Animations.DefaultAnimation.AnimID 
                        == AnimationSet.Animations.AnimsUUID["SIT_GROUND_CONSTRAINED"])
                    {
                        // This is for ground sitting avatars
                        float height = presence.Appearance.AvatarHeight / 2.66666667f;
                        lower = new LSL_Vector(-0.3375f, -0.45f, height * -1.0f);
                        upper = new LSL_Vector(0.3375f, 0.45f, 0.0f);
                    }
                    else
                    {
                        // This is for standing/flying avatars
                        float height = presence.Appearance.AvatarHeight / 2.0f;
                        lower = new LSL_Vector(-0.225f, -0.3f, height * -1.0f);
                        upper = new LSL_Vector(0.225f, 0.3f, height + 0.05f);
                    }
                    result.Add(lower);
                    result.Add(upper);
                    return result;
                }
                else
                {
                    // sitting on an object so we need the bounding box of that
                    // which should include the avatar so set the UUID to the
                    // UUID of the object the avatar is sat on and allow it to fall through
                    // to processing an object
                    SceneObjectPart p = World.GetSceneObjectPart(presence.ParentID);
                    objID = p.UUID;
                }
            }
            SceneObjectPart part = World.GetSceneObjectPart(objID);
            // Currently only works for single prims without a sitting avatar
            if (part != null)
            {
                Vector3 halfSize = part.Scale / 2.0f;
                LSL_Vector lower = new LSL_Vector(halfSize.X * -1.0f, halfSize.Y * -1.0f, halfSize.Z * -1.0f);
                LSL_Vector upper = new LSL_Vector(halfSize.X, halfSize.Y, halfSize.Z);
                result.Add(lower);
                result.Add(upper);
                return result;
            }

            // Not found so return empty values
            result.Add(new LSL_Vector());
            result.Add(new LSL_Vector());
            return result;
        }

        public LSL_Vector llGetGeometricCenter()
        {
            return new LSL_Vector(m_host.GetGeometricCenter().X, m_host.GetGeometricCenter().Y, m_host.GetGeometricCenter().Z);
        }

        public LSL_List llGetPrimitiveParams(LSL_List rules)
        {
            m_host.AddScriptLPS(1);
            return GetLinkPrimitiveParams(m_host, rules);
        }

        public LSL_List llGetLinkPrimitiveParams(int linknumber, LSL_List rules)
        {
            m_host.AddScriptLPS(1);

            List<SceneObjectPart> parts = GetLinkParts(linknumber);

            LSL_List res = new LSL_List();

            foreach (var part in parts)
            {
                LSL_List partRes = GetLinkPrimitiveParams(part, rules);
                res += partRes;
            }

            return res;
        }

        public LSL_List GetLinkPrimitiveParams(SceneObjectPart part, LSL_List rules)
        {
            LSL_List res = new LSL_List();
            int idx=0;
            while (idx < rules.Length)
            {
                int code=(int)rules.GetLSLIntegerItem(idx++);
                int remain=rules.Length-idx;

                switch (code)
                {
                    case (int)ScriptBaseClass.PRIM_MATERIAL:
                        res.Add(new LSL_Integer(part.Material));
                        break;

                    case (int)ScriptBaseClass.PRIM_PHYSICS:
                        if ((part.GetEffectiveObjectFlags() & (uint)PrimFlags.Physics) != 0)
                            res.Add(new LSL_Integer(1));
                        else
                            res.Add(new LSL_Integer(0));
                        break;

                    case (int)ScriptBaseClass.PRIM_TEMP_ON_REZ:
                        if ((part.GetEffectiveObjectFlags() & (uint)PrimFlags.TemporaryOnRez) != 0)
                            res.Add(new LSL_Integer(1));
                        else
                            res.Add(new LSL_Integer(0));
                        break;

                    case (int)ScriptBaseClass.PRIM_PHANTOM:
                        if ((part.GetEffectiveObjectFlags() & (uint)PrimFlags.Phantom) != 0)
                            res.Add(new LSL_Integer(1));
                        else
                            res.Add(new LSL_Integer(0));
                        break;

                    case (int)ScriptBaseClass.PRIM_POSITION:
                        LSL_Vector v = new LSL_Vector(part.AbsolutePosition.X,
                                                      part.AbsolutePosition.Y,
                                                      part.AbsolutePosition.Z);
                        // For some reason, the part.AbsolutePosition.* values do not change if the
                        // linkset is rotated; they always reflect the child prim's world position
                        // as though the linkset is unrotated. This is incompatible behavior with SL's
                        // implementation, so will break scripts imported from there (not to mention it
                        // makes it more difficult to determine a child prim's actual inworld position).
                        if (part.ParentID != 0)
                            v = ((v - llGetRootPosition()) * llGetRootRotation()) + llGetRootPosition();
                        res.Add(v);
                        break;

                    case (int)ScriptBaseClass.PRIM_SIZE:
                        res.Add(new LSL_Vector(part.Scale.X,
                                                      part.Scale.Y,
                                                      part.Scale.Z));
                        break;

                    case (int)ScriptBaseClass.PRIM_ROTATION:
                        res.Add(GetPartRot(part));
                        break;

                    case (int)ScriptBaseClass.PRIM_TYPE:
                        // implementing box
                        PrimitiveBaseShape Shape = part.Shape;
                        int primType = (int)part.GetPrimType();
                        res.Add(new LSL_Integer(primType));
                        double topshearx = (double)(sbyte)Shape.PathShearX / 100.0; // Fix negative values for PathShearX
                        double topsheary = (double)(sbyte)Shape.PathShearY / 100.0; // and PathShearY.
                        switch (primType)
                        {
                            case ScriptBaseClass.PRIM_TYPE_BOX:
                            case ScriptBaseClass.PRIM_TYPE_CYLINDER:
                            case ScriptBaseClass.PRIM_TYPE_PRISM:
                                res.Add(new LSL_Integer(Shape.ProfileCurve));
                                res.Add(new LSL_Vector(Shape.ProfileBegin / 50000.0, 1 - Shape.ProfileEnd / 50000.0, 0));
                                res.Add(new LSL_Float(Shape.ProfileHollow / 50000.0));
                                res.Add(new LSL_Vector(Shape.PathTwistBegin / 100.0, Shape.PathTwist / 100.0, 0));
                                res.Add(new LSL_Vector(1 - (Shape.PathScaleX / 100.0 - 1), 1 - (Shape.PathScaleY / 100.0 - 1), 0));
                                res.Add(new LSL_Vector(topshearx, topsheary, 0));
                                break;

                            case ScriptBaseClass.PRIM_TYPE_SPHERE:
                                res.Add(new LSL_Integer(Shape.ProfileCurve));
                                res.Add(new LSL_Vector(Shape.PathBegin / 50000.0, 1 - Shape.PathEnd / 50000.0, 0));
                                res.Add(new LSL_Float(Shape.ProfileHollow / 50000.0));
                                res.Add(new LSL_Vector(Shape.PathTwistBegin / 100.0, Shape.PathTwist / 100.0, 0));
                                res.Add(new LSL_Vector(Shape.ProfileBegin / 50000.0, 1 - Shape.ProfileEnd / 50000.0, 0));
                                break;

                            case ScriptBaseClass.PRIM_TYPE_SCULPT:
                                res.Add(Shape.SculptTexture.ToString());
                                res.Add(new LSL_Integer(Shape.SculptType));
                                break;

                            case ScriptBaseClass.PRIM_TYPE_RING:
                            case ScriptBaseClass.PRIM_TYPE_TUBE:
                            case ScriptBaseClass.PRIM_TYPE_TORUS:
                                // holeshape
                                res.Add(new LSL_Integer(Shape.ProfileCurve));

                                // cut
                                res.Add(new LSL_Vector(Shape.PathBegin / 50000.0, 1 - Shape.PathEnd / 50000.0, 0));

                                // hollow
                                res.Add(new LSL_Float(Shape.ProfileHollow / 50000.0));

                                // twist
                                res.Add(new LSL_Vector(Shape.PathTwistBegin / 100.0, Shape.PathTwist / 100.0, 0));

                                // vector holesize
                                res.Add(new LSL_Vector(1 - (Shape.PathScaleX / 100.0 - 1), 1 - (Shape.PathScaleY / 100.0 - 1), 0));

                                // vector topshear
                                res.Add(new LSL_Vector(topshearx, topsheary, 0));

                                // vector profilecut
                                res.Add(new LSL_Vector(Shape.ProfileBegin / 50000.0, 1 - Shape.ProfileEnd / 50000.0, 0));

                                // vector tapera
                                res.Add(new LSL_Vector(Shape.PathTaperX / 100.0, Shape.PathTaperY / 100.0, 0));

                                // float revolutions
                                res.Add(new LSL_Float((Shape.PathRevolutions * 0.015) + 1.0)); // Slightly inaccurate, because an unsigned
                                                                                               // byte is being used to represent the entire
                                                                                               // range of floating-point values from 1.0
                                                                                               // through 4.0 (which is how SL does it). 
                        
                                // float radiusoffset
                                res.Add(new LSL_Float(Shape.PathRadiusOffset / 100.0));

                                // float skew
                                res.Add(new LSL_Float(Shape.PathSkew / 100.0));
                                break;
                        }
                        break;

                    case (int)ScriptBaseClass.PRIM_TEXTURE:
                        if (remain < 1)
                            return res;

                        int face = (int)rules.GetLSLIntegerItem(idx++);
                        Primitive.TextureEntry tex = part.Shape.Textures;
                        if (face == ScriptBaseClass.ALL_SIDES)
                        {
                            for (face = 0 ; face < GetNumberOfSides(part); face++)
                            {
                                Primitive.TextureEntryFace texface = tex.GetFace((uint)face);

                                res.Add(new LSL_String(texface.TextureID.ToString()));
                                res.Add(new LSL_Vector(texface.RepeatU,
                                                       texface.RepeatV,
                                                       0));
                                res.Add(new LSL_Vector(texface.OffsetU,
                                                       texface.OffsetV,
                                                       0));
                                res.Add(new LSL_Float(texface.Rotation));
                            }
                        }
                        else
                        {
                            if (face >= 0 && face < GetNumberOfSides(part))
                            {
                                Primitive.TextureEntryFace texface = tex.GetFace((uint)face);

                                res.Add(new LSL_String(texface.TextureID.ToString()));
                                res.Add(new LSL_Vector(texface.RepeatU,
                                                       texface.RepeatV,
                                                       0));
                                res.Add(new LSL_Vector(texface.OffsetU,
                                                       texface.OffsetV,
                                                       0));
                                res.Add(new LSL_Float(texface.Rotation));
                            }
                        }
                        break;

                    case (int)ScriptBaseClass.PRIM_COLOR:
                        if (remain < 1)
                            return res;

                        face=(int)rules.GetLSLIntegerItem(idx++);

                        tex = part.Shape.Textures;
                        Color4 texcolor;
                        if (face == ScriptBaseClass.ALL_SIDES)
                        {
                            for (face = 0 ; face < GetNumberOfSides(part); face++)
                            {
                                texcolor = tex.GetFace((uint)face).RGBA;
                                res.Add(new LSL_Vector(texcolor.R,
                                                       texcolor.G,
                                                       texcolor.B));
                                res.Add(new LSL_Float(texcolor.A));
                            }
                        }
                        else
                        {
                            texcolor = tex.GetFace((uint)face).RGBA;
                            res.Add(new LSL_Vector(texcolor.R,
                                                   texcolor.G,
                                                   texcolor.B));
                            res.Add(new LSL_Float(texcolor.A));
                        }
                        break;

                    case (int)ScriptBaseClass.PRIM_BUMP_SHINY:
                        if (remain < 1)
                            return res;
                        face = (int)rules.GetLSLIntegerItem(idx++);

                        tex = part.Shape.Textures;
                        int shiny;
                        if (face == ScriptBaseClass.ALL_SIDES)
                        {
                            for (face = 0; face < GetNumberOfSides(part); face++)
                            {
                                Shininess shinyness = tex.GetFace((uint)face).Shiny;
                                if (shinyness == Shininess.High)
                                {
                                    shiny = ScriptBaseClass.PRIM_SHINY_HIGH;
                                }
                                else if (shinyness == Shininess.Medium)
                                {
                                    shiny = ScriptBaseClass.PRIM_SHINY_MEDIUM;
                                }
                                else if (shinyness == Shininess.Low)
                                {
                                    shiny = ScriptBaseClass.PRIM_SHINY_LOW;
                                }
                                else
                                {
                                    shiny = ScriptBaseClass.PRIM_SHINY_NONE;
                                }
                                res.Add(new LSL_Integer(shiny));
                                res.Add(new LSL_Integer((int)tex.GetFace((uint)face).Bump));
                            }
                        }
                        else
                        {
                            Shininess shinyness = tex.GetFace((uint)face).Shiny;
                            if (shinyness == Shininess.High)
                            {
                                shiny = ScriptBaseClass.PRIM_SHINY_HIGH; 
                            }
                            else if (shinyness == Shininess.Medium)
                            {
                                shiny = ScriptBaseClass.PRIM_SHINY_MEDIUM;
                            }
                            else if (shinyness == Shininess.Low)
                            {
                                shiny = ScriptBaseClass.PRIM_SHINY_LOW;
                            }
                            else
                            {
                                shiny = ScriptBaseClass.PRIM_SHINY_NONE;
                            }
                            res.Add(new LSL_Integer(shiny));
                            res.Add(new LSL_Integer((int)tex.GetFace((uint)face).Bump));
                        }
                        break;

                    case (int)ScriptBaseClass.PRIM_FULLBRIGHT:
                        if (remain < 1)
                            return res;
                        face = (int)rules.GetLSLIntegerItem(idx++);

                        tex = part.Shape.Textures;
                        int fullbright;
                        if (face == ScriptBaseClass.ALL_SIDES)
                        {
                            for (face = 0; face < GetNumberOfSides(part); face++)
                            {
                                if (tex.GetFace((uint)face).Fullbright == true)
                                {
                                    fullbright = ScriptBaseClass.TRUE;
                                }
                                else
                                {
                                    fullbright = ScriptBaseClass.FALSE;
                                }
                                res.Add(new LSL_Integer(fullbright));
                            }
                        }
                        else
                        {
                            if (tex.GetFace((uint)face).Fullbright == true)
                            {
                                fullbright = ScriptBaseClass.TRUE;
                            }
                            else
                            {
                                fullbright = ScriptBaseClass.FALSE;
                            }
                            res.Add(new LSL_Integer(fullbright));
                        }
                        break;

                    case (int)ScriptBaseClass.PRIM_FLEXIBLE:
                        PrimitiveBaseShape shape = part.Shape;

                        if (shape.FlexiEntry)
                            res.Add(new LSL_Integer(1));              // active
                        else
                            res.Add(new LSL_Integer(0));
                        res.Add(new LSL_Integer(shape.FlexiSoftness));// softness
                        res.Add(new LSL_Float(shape.FlexiGravity));   // gravity
                        res.Add(new LSL_Float(shape.FlexiDrag));      // friction
                        res.Add(new LSL_Float(shape.FlexiWind));      // wind
                        res.Add(new LSL_Float(shape.FlexiTension));   // tension
                        res.Add(new LSL_Vector(shape.FlexiForceX,       // force
                                               shape.FlexiForceY,
                                               shape.FlexiForceZ));
                        break;

                    case (int)ScriptBaseClass.PRIM_TEXGEN:
                        // (PRIM_TEXGEN_DEFAULT, PRIM_TEXGEN_PLANAR)
                        if (remain < 1)
                            return res;
                        face = (int)rules.GetLSLIntegerItem(idx++);

                        tex = part.Shape.Textures;
                        if (face == ScriptBaseClass.ALL_SIDES)
                        {
                            for (face = 0; face < GetNumberOfSides(part); face++)
                            {
                                if (tex.GetFace((uint)face).TexMapType == MappingType.Planar)
                                {
                                    res.Add(new LSL_Integer(ScriptBaseClass.PRIM_TEXGEN_PLANAR));
                                }
                                else
                                {
                                    res.Add(new LSL_Integer(ScriptBaseClass.PRIM_TEXGEN_DEFAULT));
                                }
                            }
                        }
                        else
                        {
                            if (tex.GetFace((uint)face).TexMapType == MappingType.Planar)
                            {
                                res.Add(new LSL_Integer(ScriptBaseClass.PRIM_TEXGEN_PLANAR));
                            }
                            else
                            {
                                res.Add(new LSL_Integer(ScriptBaseClass.PRIM_TEXGEN_DEFAULT));
                            }
                        }
                        break;

                    case (int)ScriptBaseClass.PRIM_POINT_LIGHT:
                        shape = part.Shape;

                        if (shape.LightEntry)
                            res.Add(new LSL_Integer(1));              // active
                        else
                            res.Add(new LSL_Integer(0));
                        res.Add(new LSL_Vector(shape.LightColorR,       // color
                                               shape.LightColorG,
                                               shape.LightColorB));
                        res.Add(new LSL_Float(shape.LightIntensity)); // intensity
                        res.Add(new LSL_Float(shape.LightRadius));    // radius
                        res.Add(new LSL_Float(shape.LightFalloff));   // falloff
                        break;

                    case (int)ScriptBaseClass.PRIM_GLOW:
                        if (remain < 1)
                            return res;
                        face = (int)rules.GetLSLIntegerItem(idx++);

                        tex = part.Shape.Textures;
                        float primglow;
                        if (face == ScriptBaseClass.ALL_SIDES)
                        {
                            for (face = 0; face < GetNumberOfSides(part); face++)
                            {
                                primglow = tex.GetFace((uint)face).Glow;
                                res.Add(new LSL_Float(primglow));
                            }
                        }
                        else
                        {
                            primglow = tex.GetFace((uint)face).Glow;
                            res.Add(new LSL_Float(primglow));
                        }
                        break;
                    case (int)ScriptBaseClass.PRIM_TEXT:
                        Color4 textColor = part.GetTextColor();
                        res.Add(part.Text);
                        res.Add(new LSL_Vector(textColor.R,
                                               textColor.G,
                                               textColor.B));
                        res.Add(new LSL_Float(textColor.A));
                        break;
                }
            }
            return res;
        }

        //  <remarks>
        //  <para>
        //  The .NET definition of base 64 is:
        //  <list>
        //  <item>
        //  Significant: A-Z a-z 0-9 + -
        //  </item>
        //  <item>
        //  Whitespace: \t \n \r ' '
        //  </item>
        //  <item>
        //  Valueless: =
        //  </item>
        //  <item>
        //  End-of-string: \0 or '=='
        //  </item>
        //  </list>
        //  </para>
        //  <para>
        //  Each point in a base-64 string represents
        //  a 6 bit value. A 32-bit integer can be
        //  represented using 6 characters (with some
        //  redundancy).
        //  </para>
        //  <para>
        //  LSL requires a base64 string to be 8
        //  characters in length. LSL also uses '/'
        //  rather than '-' (MIME compliant).
        //  </para>
        //  <para>
        //  RFC 1341 used as a reference (as specified
        //  by the SecondLife Wiki).
        //  </para>
        //  <para>
        //  SL do not record any kind of exception for
        //  these functions, so the string to integer
        //  conversion returns '0' if an invalid
        //  character is encountered during conversion.
        //  </para>
        //  <para>
        //  References
        //  <list>
        //  <item>
        //  http://lslwiki.net/lslwiki/wakka.php?wakka=Base64
        //  </item>
        //  <item>
        //  </item>
        //  </list>
        //  </para>
        //  </remarks>

        //  <summary>
        //  Table for converting 6-bit integers into
        //  base-64 characters
        //  </summary>

        protected static readonly char[] i2ctable =
        {
            'A','B','C','D','E','F','G','H',
            'I','J','K','L','M','N','O','P',
            'Q','R','S','T','U','V','W','X',
            'Y','Z',
            'a','b','c','d','e','f','g','h',
            'i','j','k','l','m','n','o','p',
            'q','r','s','t','u','v','w','x',
            'y','z',
            '0','1','2','3','4','5','6','7',
            '8','9',
            '+','/'
        };

        //  <summary>
        //  Table for converting base-64 characters
        //  into 6-bit integers.
        //  </summary>

        protected static readonly int[] c2itable =
        {
            -1,-1,-1,-1,-1,-1,-1,-1,    // 0x
            -1,-1,-1,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // 1x
            -1,-1,-1,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // 2x
            -1,-1,-1,63,-1,-1,-1,64,
            53,54,55,56,57,58,59,60,    // 3x
            61,62,-1,-1,-1,0,-1,-1,
            -1,1,2,3,4,5,6,7,           // 4x
            8,9,10,11,12,13,14,15,
            16,17,18,19,20,21,22,23,    // 5x
            24,25,26,-1,-1,-1,-1,-1,
            -1,27,28,29,30,31,32,33,    // 6x
            34,35,36,37,38,39,40,41,
            42,43,44,45,46,47,48,49,    // 7x
            50,51,52,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // 8x
            -1,-1,-1,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // 9x
            -1,-1,-1,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // Ax
            -1,-1,-1,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // Bx
            -1,-1,-1,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // Cx
            -1,-1,-1,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // Dx
            -1,-1,-1,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // Ex
            -1,-1,-1,-1,-1,-1,-1,-1,
            -1,-1,-1,-1,-1,-1,-1,-1,    // Fx
            -1,-1,-1,-1,-1,-1,-1,-1
        };

        //  <summary>
        //  Converts a 32-bit integer into a Base64
        //  character string. Base64 character strings
        //  are always 8 characters long. All iinteger
        //  values are acceptable.
        //  </summary>
        //  <param name="number">
        //  32-bit integer to be converted.
        //  </param>
        //  <returns>
        //  8 character string. The 1st six characters
        //  contain the encoded number, the last two
        //  characters are padded with "=".
        //  </returns>

        public LSL_String llIntegerToBase64(int number)
        {
            // uninitialized string

            char[] imdt = new char[8];

            m_host.AddScriptLPS(1);

            // Manually unroll the loop

            imdt[7] = '=';
            imdt[6] = '=';
            imdt[5] = i2ctable[number<<4  & 0x3F];
            imdt[4] = i2ctable[number>>2  & 0x3F];
            imdt[3] = i2ctable[number>>8  & 0x3F];
            imdt[2] = i2ctable[number>>14 & 0x3F];
            imdt[1] = i2ctable[number>>20 & 0x3F];
            imdt[0] = i2ctable[number>>26 & 0x3F];

            return new string(imdt);
        }

        //  <summary>
        //  Converts an eight character base-64 string
        //  into a 32-bit integer.
        //  </summary>
        //  <param name="str">
        //  8 characters string to be converted. Other
        //  length strings return zero.
        //  </param>
        //  <returns>
        //  Returns an integer representing the
        //  encoded value providedint he 1st 6
        //  characters of the string.
        //  </returns>
        //  <remarks>
        //  This is coded to behave like LSL's
        //  implementation (I think), based upon the
        //  information available at the Wiki.
        //  If more than 8 characters are supplied,
        //  zero is returned.
        //  If a NULL string is supplied, zero will
        //  be returned.
        //  If fewer than 6 characters are supplied, then
        //  the answer will reflect a partial
        //  accumulation.
        //  <para>
        //  The 6-bit segments are
        //  extracted left-to-right in big-endian mode,
        //  which means that segment 6 only contains the
        //  two low-order bits of the 32 bit integer as
        //  its high order 2 bits. A short string therefore
        //  means loss of low-order information. E.g.
        //
        //  |<---------------------- 32-bit integer ----------------------->|<-Pad->|
        //  |<--Byte 0----->|<--Byte 1----->|<--Byte 2----->|<--Byte 3----->|<-Pad->|
        //  |3|3|2|2|2|2|2|2|2|2|2|2|1|1|1|1|1|1|1|1|1|1| | | | | | | | | | |P|P|P|P|
        //  |1|0|9|8|7|6|5|4|3|2|1|0|9|8|7|6|5|4|3|2|1|0|9|8|7|6|5|4|3|2|1|0|P|P|P|P|
        //  |  str[0]   |  str[1]   |  str[2]   |  str[3]   |  str[4]   |  str[6]   |
        //
        //  </para>
        //  </remarks>

        public LSL_Integer llBase64ToInteger(string str)
        {
            int number = 0;
            int digit;

            m_host.AddScriptLPS(1);

            //    Require a well-fromed base64 string

            if (str.Length > 8)
                return 0;

            //    The loop is unrolled in the interests
            //    of performance and simple necessity.
            //
            //    MUST find 6 digits to be well formed
            //      -1 == invalid
            //       0 == padding

            if ((digit = c2itable[str[0]]) <= 0)
            {
                return digit < 0 ? (int)0 : number;
            }
            number += --digit<<26;

            if ((digit = c2itable[str[1]]) <= 0)
            {
                return digit < 0 ? (int)0 : number;
            }
            number += --digit<<20;

            if ((digit = c2itable[str[2]]) <= 0)
            {
                return digit < 0 ? (int)0 : number;
            }
            number += --digit<<14;

            if ((digit = c2itable[str[3]]) <= 0)
            {
                return digit < 0 ? (int)0 : number;
            }
            number += --digit<<8;

            if ((digit = c2itable[str[4]]) <= 0)
            {
                return digit < 0 ? (int)0 : number;
            }
            number += --digit<<2;

            if ((digit = c2itable[str[5]]) <= 0)
            {
                return digit < 0 ? (int)0 : number;
            }
            number += --digit>>4;

            // ignore trailing padding

            return number;
        }

        public LSL_Float llGetGMTclock()
        {
            m_host.AddScriptLPS(1);
            return DateTime.UtcNow.TimeOfDay.TotalSeconds;
        }

        public LSL_String llGetHTTPHeader(LSL_Key request_id, string header)
        {
            m_host.AddScriptLPS(1);
             
           if (m_UrlModule != null)
               return m_UrlModule.GetHttpHeader(new UUID(request_id), header);
           return String.Empty;
        }


        public LSL_String llGetSimulatorHostname()
        {
            m_host.AddScriptLPS(1);
            return System.Environment.MachineName;
        }

        //  <summary>
        //  Scan the string supplied in 'src' and
        //  tokenize it based upon two sets of
        //  tokenizers provided in two lists,
        //  separators and spacers.
        //  </summary>
        //
        //  <remarks>
        //  Separators demarcate tokens and are
        //  elided as they are encountered. Spacers
        //  also demarcate tokens, but are themselves
        //  retained as tokens.
        //
        //  Both separators and spacers may be arbitrarily
        //  long strings. i.e. ":::".
        //
        //  The function returns an ordered list
        //  representing the tokens found in the supplied
        //  sources string. If two successive tokenizers
        //  are encountered, then a NULL entry is added
        //  to the list.
        //
        //  It is a precondition that the source and
        //  toekizer lisst are non-null. If they are null,
        //  then a null pointer exception will be thrown
        //  while their lengths are being determined.
        //
        //  A small amount of working memoryis required
        //  of approximately 8*#tokenizers.
        //
        //  There are many ways in which this function
        //  can be implemented, this implementation is
        //  fairly naive and assumes that when the
        //  function is invooked with a short source
        //  string and/or short lists of tokenizers, then
        //  performance will not be an issue.
        //
        //  In order to minimize the perofrmance
        //  effects of long strings, or large numbers
        //  of tokeizers, the function skips as far as
        //  possible whenever a toekenizer is found,
        //  and eliminates redundant tokenizers as soon
        //  as is possible.
        //
        //  The implementation tries to avoid any copying
        //  of arrays or other objects.
        //  </remarks>

        public LSL_List llParseStringKeepNulls(string src, LSL_List separators, LSL_List spacers)
        {
            int         beginning = 0;
            int         srclen    = src.Length;
            int         seplen    = separators.Length;
            object[]    separray  = separators.Data;
            int         spclen    = spacers.Length;
            object[]    spcarray  = spacers.Data;
            int         mlen      = seplen+spclen;

            int[]       offset    = new int[mlen+1];
            bool[]      active    = new bool[mlen];

            int         best;
            int         j;

            //    Initial capacity reduces resize cost

            LSL_List tokens = new LSL_List();

            m_host.AddScriptLPS(1);

            //    All entries are initially valid

            for (int i = 0; i < mlen; i++)
                active[i] = true;

            offset[mlen] = srclen;

            while (beginning < srclen)
            {

                best = mlen;    // as bad as it gets

                //    Scan for separators

                for (j = 0; j < seplen; j++)
                {
                    if (active[j])
                    {
                        // scan all of the markers
                        if ((offset[j] = src.IndexOf(separray[j].ToString(), beginning)) == -1)
                        {
                            // not present at all
                            active[j] = false;
                        }
                        else
                        {
                            // present and correct
                            if (offset[j] < offset[best])
                            {
                                // closest so far
                                best = j;
                                if (offset[best] == beginning)
                                    break;
                            }
                        }
                    }
                }

                //    Scan for spacers

                if (offset[best] != beginning)
                {
                    for (j = seplen; (j < mlen) && (offset[best] > beginning); j++)
                    {
                        if (active[j])
                        {
                            // scan all of the markers
                            if ((offset[j] = src.IndexOf(spcarray[j-seplen].ToString(), beginning)) == -1)
                            {
                                // not present at all
                                active[j] = false;
                            }
                            else
                            {
                                // present and correct
                                if (offset[j] < offset[best])
                                {
                                    // closest so far
                                    best = j;
                                }
                            }
                        }
                    }
                }

                //    This is the normal exit from the scanning loop

                if (best == mlen)
                {
                    // no markers were found on this pass
                    // so we're pretty much done
                    tokens.Add(new LSL_String(src.Substring(beginning, srclen - beginning)));
                    break;
                }

                //    Otherwise we just add the newly delimited token
                //    and recalculate where the search should continue.

                tokens.Add(new LSL_String(src.Substring(beginning,offset[best]-beginning)));

                if (best < seplen)
                {
                    beginning = offset[best] + (separray[best].ToString()).Length;
                }
                else
                {
                    beginning = offset[best] + (spcarray[best - seplen].ToString()).Length;
                    tokens.Add(new LSL_String(spcarray[best - seplen].ToString()));
                }
            }

            //    This an awkward an not very intuitive boundary case. If the
            //    last substring is a tokenizer, then there is an implied trailing
            //    null list entry. Hopefully the single comparison will not be too
            //    arduous. Alternatively the 'break' could be replced with a return
            //    but that's shabby programming.

            if (beginning == srclen)
            {
                if (srclen != 0)
                    tokens.Add(new LSL_String(""));
            }

            return tokens;
        }

        public LSL_Integer llGetObjectPermMask(int mask)
        {
            m_host.AddScriptLPS(1);

            int permmask = 0;

            if (mask == ScriptBaseClass.MASK_BASE)//0
            {
                permmask = (int)m_host.BaseMask;
            }

            else if (mask == ScriptBaseClass.MASK_OWNER)//1
            {
                permmask = (int)m_host.OwnerMask;
            }

            else if (mask == ScriptBaseClass.MASK_GROUP)//2
            {
                permmask = (int)m_host.GroupMask;
            }

            else if (mask == ScriptBaseClass.MASK_EVERYONE)//3
            {
                permmask = (int)m_host.EveryoneMask;
            }

            else if (mask == ScriptBaseClass.MASK_NEXT)//4
            {
                permmask = (int)m_host.NextOwnerMask;
            }

            return permmask;
        }

        public void llSetObjectPermMask(int mask, int value)
        {
            m_host.AddScriptLPS(1);

            if (m_ScriptEngine.Config.GetBoolean("AllowGodFunctions", false))
            {
                if (World.Permissions.CanRunConsoleCommand(m_host.OwnerID))
                {
                    if (mask == ScriptBaseClass.MASK_BASE)//0
                    {
                        m_host.BaseMask = (uint)value;
                    }

                    else if (mask == ScriptBaseClass.MASK_OWNER)//1
                    {
                        m_host.OwnerMask = (uint)value;
                    }

                    else if (mask == ScriptBaseClass.MASK_GROUP)//2
                    {
                        m_host.GroupMask = (uint)value;
                    }

                    else if (mask == ScriptBaseClass.MASK_EVERYONE)//3
                    {
                        m_host.EveryoneMask = (uint)value;
                    }

                    else if (mask == ScriptBaseClass.MASK_NEXT)//4
                    {
                        m_host.NextOwnerMask = (uint)value;
                    }
                }
            }
        }

        public LSL_Integer llGetInventoryPermMask(string item, int mask)
        {
            m_host.AddScriptLPS(1);

            m_host.TaskInventory.LockItemsForRead(true);
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Name == item)
                {
                    m_host.TaskInventory.LockItemsForRead(false);
                    switch (mask)
                    {
                        case 0:
                            return (int)inv.Value.BasePermissions;
                        case 1:
                            return (int)inv.Value.CurrentPermissions;
                        case 2:
                            return (int)inv.Value.GroupPermissions;
                        case 3:
                            return (int)inv.Value.EveryonePermissions;
                        case 4:
                            return (int)inv.Value.NextPermissions;
                    }
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            return -1;
        }

        public void llSetInventoryPermMask(string item, int mask, int value)
        {
            m_host.AddScriptLPS(1);
            if (m_ScriptEngine.Config.GetBoolean("AllowGodFunctions", false))
            {
                if (World.Permissions.CanRunConsoleCommand(m_host.OwnerID))
                {
                    lock (m_host.TaskInventory)
                    {
                        foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
                        {
                            if (inv.Value.Name == item)
                            {
                                switch (mask)
                                {
                                    case 0:
                                        inv.Value.BasePermissions = (uint)value;
                                        break;
                                    case 1:
                                        inv.Value.CurrentPermissions = (uint)value;
                                        break;
                                    case 2:
                                        inv.Value.GroupPermissions = (uint)value;
                                        break;
                                    case 3:
                                        inv.Value.EveryonePermissions = (uint)value;
                                        break;
                                    case 4:
                                        inv.Value.NextPermissions = (uint)value;
                                        break;
                                }
                            }
                        }
                    }
                }
            }
        }

        public LSL_String llGetInventoryCreator(string item)
        {
            m_host.AddScriptLPS(1);

            m_host.TaskInventory.LockItemsForRead(true);
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Name == item)
                {
                    m_host.TaskInventory.LockItemsForRead(false);
                    return inv.Value.CreatorID.ToString();
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            llSay(0, "No item name '" + item + "'");

            return String.Empty;
        }

        public void llOwnerSay(string msg)
        {
            m_host.AddScriptLPS(1);

            World.SimChatBroadcast(Utils.StringToBytes(msg), ChatTypeEnum.Owner, 0,
                                   m_host.AbsolutePosition, m_host.Name, m_host.UUID, false);
//            IWorldComm wComm = m_ScriptEngine.World.RequestModuleInterface<IWorldComm>();
//            wComm.DeliverMessage(ChatTypeEnum.Owner, 0, m_host.Name, m_host.UUID, msg);
        }

        public LSL_String llRequestSecureURL()
        {
            m_host.AddScriptLPS(1);
            if (m_UrlModule != null)
                return m_UrlModule.RequestSecureURL(m_ScriptEngine.ScriptModule, m_host, m_itemID).ToString();
            return UUID.Zero.ToString();
        }

        public LSL_String llRequestSimulatorData(string simulator, int data)
        {
            IOSSL_Api ossl = (IOSSL_Api)m_ScriptEngine.GetApi(m_itemID, "OSSL");

            try
            {
                m_host.AddScriptLPS(1);

                string reply = String.Empty;

                GridRegion info = m_ScriptEngine.World.GridService.GetRegionByName(m_ScriptEngine.World.RegionInfo.ScopeID, simulator);

                switch (data)
                {
                    case 5: // DATA_SIM_POS
                        if (info == null)
                        {
                            ScriptSleep(1000);
                            return UUID.Zero.ToString();
                        }
                        reply = new LSL_Vector(
                            info.RegionLocX * Constants.RegionSize,
                            info.RegionLocY * Constants.RegionSize,
                            0).ToString();
                        break;
                    case 6: // DATA_SIM_STATUS
                        if (info != null)
                            reply = "up"; // Duh!
                        else
                            reply = "unknown";
                        break;
                    case 7: // DATA_SIM_RATING
                        if (info == null)
                        {
                            ScriptSleep(1000);
                            return UUID.Zero.ToString();
                        }
                        int access = info.Maturity;
                        if (access == 0)
                            reply = "PG";
                        else if (access == 1)
                            reply = "MATURE";
                        else if (access == 2)
                            reply = "ADULT";
                        else
                            reply = "UNKNOWN";
                        break;
                    case 128:
                        if (ossl != null)
                            ossl.CheckThreatLevel(ThreatLevel.High, "llRequestSimulatorData");
                        reply = "OpenSim";
                        break;
                    default:
                        ScriptSleep(1000);
                        return UUID.Zero.ToString(); // Raise no event
                }
                UUID rq = UUID.Random();

                UUID tid = AsyncCommands.
                    DataserverPlugin.RegisterRequest(m_localID, m_itemID, rq.ToString());

                AsyncCommands.
                    DataserverPlugin.DataserverReply(rq.ToString(), reply);

                ScriptSleep(1000);
                return tid.ToString();
            }
            catch(Exception)
            {
                //m_log.Error("[LSL_API]: llRequestSimulatorData" + e.ToString());
                return UUID.Zero.ToString();
            }
        }
        public LSL_String llRequestURL()
        {
            m_host.AddScriptLPS(1);

            if (m_UrlModule != null)
                return m_UrlModule.RequestURL(m_ScriptEngine.ScriptModule, m_host, m_itemID).ToString();
            return UUID.Zero.ToString();
        }

        public void llForceMouselook(int mouselook)
        {
            m_host.AddScriptLPS(1);
            m_host.SetForceMouselook(mouselook != 0);
        }

        public LSL_Float llGetObjectMass(string id)
        {
            m_host.AddScriptLPS(1);
            UUID key = new UUID();
            if (UUID.TryParse(id, out key))
            {
                try
                {
                    SceneObjectPart obj = World.GetSceneObjectPart(World.Entities[key].LocalId);
                    if (obj != null)
                        return (double)obj.GetMass();
                    // the object is null so the key is for an avatar
                    ScenePresence avatar = World.GetScenePresence(key);
                    if (avatar != null)
                        if (avatar.IsChildAgent)
                            // reference http://www.lslwiki.net/lslwiki/wakka.php?wakka=llGetObjectMass
                            // child agents have a mass of 1.0
                            return 1;
                        else
                            return (double)avatar.PhysicsActor.Mass;
                }
                catch (KeyNotFoundException)
                {
                    return 0; // The Object/Agent not in the region so just return zero
                }
            }
            return 0;
        }

        /// <summary>
        /// illListReplaceList removes the sub-list defined by the inclusive indices
        /// start and end and inserts the src list in its place. The inclusive
        /// nature of the indices means that at least one element must be deleted
        /// if the indices are within the bounds of the existing list. I.e. 2,2
        /// will remove the element at index 2 and replace it with the source
        /// list. Both indices may be negative, with the usual interpretation. An
        /// interesting case is where end is lower than start. As these indices
        /// bound the list to be removed, then 0->end, and start->lim are removed
        /// and the source list is added as a suffix.
        /// </summary>

        public LSL_List llListReplaceList(LSL_List dest, LSL_List src, int start, int end)
        {
            LSL_List pref = null;

            m_host.AddScriptLPS(1);

            // Note that although we have normalized, both
            // indices could still be negative.
            if (start < 0)
            {
                start = start+dest.Length;
            }

            if (end < 0)
            {
                end = end+dest.Length;
            }
            // The comventional case, remove a sequence starting with
            // start and ending with end. And then insert the source
            // list.
            if (start <= end)
            {
                // If greater than zero, then there is going to be a
                // surviving prefix. Otherwise the inclusive nature
                // of the indices mean that we're going to add the
                // source list as a prefix.
                if (start > 0)
                {
                    pref = dest.GetSublist(0,start-1);
                    // Only add a suffix if there is something
                    // beyond the end index (it's inclusive too).
                    if (end + 1 < dest.Length)
                    {
                        return pref + src + dest.GetSublist(end + 1, -1);
                    }
                    else
                    {
                        return pref + src;
                    }
                }
                // If start is less than or equal to zero, then
                // the new list is simply a prefix. We still need to
                // figure out any necessary surgery to the destination
                // based upon end. Note that if end exceeds the upper
                // bound in this case, the entire destination list
                // is removed.
                else
                {
                    if (end + 1 < dest.Length)
                    {
                        return src + dest.GetSublist(end + 1, -1);
                    }
                    else
                    {
                        return src;
                    }
                }
            }
            // Finally, if start > end, we strip away a prefix and
            // a suffix, to leave the list that sits <between> ens
            // and start, and then tag on the src list. AT least
            // that's my interpretation. We can get sublist to do
            // this for us. Note that one, or both of the indices
            // might have been negative.
            else
            {
                return dest.GetSublist(end + 1, start - 1) + src;
            }
        }

        public void llLoadURL(string avatar_id, string message, string url)
        {
            m_host.AddScriptLPS(1);

            IDialogModule dm = World.RequestModuleInterface<IDialogModule>();
            if (null != dm)
                dm.SendUrlToUser(
                    new UUID(avatar_id), m_host.Name, m_host.UUID, m_host.OwnerID, false, message, url);

            ScriptSleep(10000);
        }

        public void llParcelMediaCommandList(LSL_List commandList)
        {
            // TODO: Not implemented yet (missing in libomv?):
            //  PARCEL_MEDIA_COMMAND_LOOP_SET    float loop      Use this to get or set the parcel's media loop duration. (1.19.1 RC0 or later)

            m_host.AddScriptLPS(1);

            // according to the docs, this command only works if script owner and land owner are the same
            // lets add estate owners and gods, too, and use the generic permission check.
            ILandObject landObject = World.LandChannel.GetLandObject(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y);
            if (!World.Permissions.CanEditParcel(m_host.OwnerID, landObject)) return;

            bool update = false; // send a ParcelMediaUpdate (and possibly change the land's media URL)?
            byte loop = 0;

            LandData landData = landObject.LandData;
            string url = landData.MediaURL;
            string texture = landData.MediaID.ToString();
            bool autoAlign = landData.MediaAutoScale != 0;
            string mediaType = ""; // TODO these have to be added as soon as LandData supports it
            string description = "";
            int width = 0;
            int height = 0;

            ParcelMediaCommandEnum? commandToSend = null;
            float time = 0.0f; // default is from start

            ScenePresence presence = null;

            for (int i = 0; i < commandList.Data.Length; i++)
            {
                ParcelMediaCommandEnum command = (ParcelMediaCommandEnum)commandList.Data[i];
                switch (command)
                {
                    case ParcelMediaCommandEnum.Agent:
                        // we send only to one agent
                        if ((i + 1) < commandList.Length)
                        {
                            if (commandList.Data[i + 1] is LSL_String)
                            {
                                UUID agentID;
                                if (UUID.TryParse((LSL_String)commandList.Data[i + 1], out agentID))
                                {
                                    presence = World.GetScenePresence(agentID);
                                }
                            }
                            else ShoutError("The argument of PARCEL_MEDIA_COMMAND_AGENT must be a key");
                            ++i;
                        }
                        break;

                    case ParcelMediaCommandEnum.Loop:
                        loop = 1;
                        commandToSend = command;
                        update = true; //need to send the media update packet to set looping
                        break;

                    case ParcelMediaCommandEnum.Play:
                        loop = 0;
                        commandToSend = command;
                        update = true; //need to send the media update packet to make sure it doesn't loop
                        break;

                    case ParcelMediaCommandEnum.Pause:
                    case ParcelMediaCommandEnum.Stop:
                    case ParcelMediaCommandEnum.Unload:
                        commandToSend = command;
                        break;

                    case ParcelMediaCommandEnum.Url:
                        if ((i + 1) < commandList.Length)
                        {
                            if (commandList.Data[i + 1] is LSL_String)
                            {
                                url = (LSL_String)commandList.Data[i + 1];
                                update = true;
                            }
                            else ShoutError("The argument of PARCEL_MEDIA_COMMAND_URL must be a string.");
                            ++i;
                        }
                        break;

                    case ParcelMediaCommandEnum.Texture:
                        if ((i + 1) < commandList.Length)
                        {
                            if (commandList.Data[i + 1] is LSL_String)
                            {
                                texture = (LSL_String)commandList.Data[i + 1];
                                update = true;
                            }
                            else ShoutError("The argument of PARCEL_MEDIA_COMMAND_TEXTURE must be a string or key.");
                            ++i;
                        }
                        break;

                    case ParcelMediaCommandEnum.Time:
                        if ((i + 1) < commandList.Length)
                        {
                            if (commandList.Data[i + 1] is LSL_Float)
                            {
                                time = (float)(LSL_Float)commandList.Data[i + 1];
                            }
                            else ShoutError("The argument of PARCEL_MEDIA_COMMAND_TIME must be a float.");
                            ++i;
                        }
                        break;

                    case ParcelMediaCommandEnum.AutoAlign:
                        if ((i + 1) < commandList.Length)
                        {
                            if (commandList.Data[i + 1] is LSL_Integer)
                            {
                                autoAlign = (LSL_Integer)commandList.Data[i + 1];
                                update = true;
                            }

                            else ShoutError("The argument of PARCEL_MEDIA_COMMAND_AUTO_ALIGN must be an integer.");
                            ++i;
                        }
                        break;

                    case ParcelMediaCommandEnum.Type:
                        if ((i + 1) < commandList.Length)
                        {
                            if (commandList.Data[i + 1] is LSL_String)
                            {
                                mediaType = (LSL_String)commandList.Data[i + 1];
                                update = true;
                            }
                            else ShoutError("The argument of PARCEL_MEDIA_COMMAND_TYPE must be a string.");
                            ++i;
                        }
                        break;

                    case ParcelMediaCommandEnum.Desc:
                        if ((i + 1) < commandList.Length)
                        {
                            if (commandList.Data[i + 1] is LSL_String)
                            {
                                description = (LSL_String)commandList.Data[i + 1];
                                update = true;
                            }
                            else ShoutError("The argument of PARCEL_MEDIA_COMMAND_DESC must be a string.");
                            ++i;
                        }
                        break;

                    case ParcelMediaCommandEnum.Size:
                        if ((i + 2) < commandList.Length)
                        {
                            if (commandList.Data[i + 1] is LSL_Integer)
                            {
                                if (commandList.Data[i + 2] is LSL_Integer)
                                {
                                    width = (LSL_Integer)commandList.Data[i + 1];
                                    height = (LSL_Integer)commandList.Data[i + 2];
                                    update = true;
                                }
                                else ShoutError("The second argument of PARCEL_MEDIA_COMMAND_SIZE must be an integer.");
                            }
                            else ShoutError("The first argument of PARCEL_MEDIA_COMMAND_SIZE must be an integer.");
                            i += 2;
                        }
                        break;

                    default:
                        NotImplemented("llParcelMediaCommandList parameter not supported yet: " + Enum.Parse(typeof(ParcelMediaCommandEnum), commandList.Data[i].ToString()).ToString());
                        break;
                }//end switch
            }//end for

            // if we didn't get a presence, we send to all and change the url
            // if we did get a presence, we only send to the agent specified, and *don't change the land settings*!

            // did something important change or do we only start/stop/pause?
            if (update)
            {
                if (presence == null)
                {
                    // we send to all
                    landData.MediaID = new UUID(texture);
                    landData.MediaAutoScale = autoAlign ? (byte)1 : (byte)0;
                    landData.MediaSize[0] = width;
                    landData.MediaSize[1] = height;
                    landData.MediaType = mediaType;

                    // do that one last, it will cause a ParcelPropertiesUpdate
                    landObject.SetMediaUrl(url);

                    // now send to all (non-child) agents
                    List<ScenePresence> agents = World.GetAvatars();
                    foreach (ScenePresence agent in agents)
                    {
                        agent.ControllingClient.SendParcelMediaUpdate(landData.MediaURL,
                                                                      landData.MediaID,
                                                                      landData.MediaAutoScale,
                                                                      mediaType,
                                                                      description,
                                                                      width, height,
                                                                      loop);
                    }
                }
                else if (!presence.IsChildAgent)
                {
                    // we only send to one (root) agent
                    presence.ControllingClient.SendParcelMediaUpdate(url,
                                                                     new UUID(texture),
                                                                     autoAlign ? (byte)1 : (byte)0,
                                                                     mediaType,
                                                                     description,
                                                                     width, height,
                                                                     loop);
                }
            }

            if (commandToSend != null)
            {
                // the commandList contained a start/stop/... command, too
                if (presence == null)
                {
                    // send to all (non-child) agents
                    List<ScenePresence> agents = World.GetAvatars();
                    foreach (ScenePresence agent in agents)
                    {
                        agent.ControllingClient.SendParcelMediaCommand(0x4, // TODO what is this?
                                                                       (ParcelMediaCommandEnum)commandToSend,
                                                                       time);
                    }
                }
                else if (!presence.IsChildAgent)
                {
                    presence.ControllingClient.SendParcelMediaCommand(0x4, // TODO what is this?
                                                                      (ParcelMediaCommandEnum)commandToSend,
                                                                      time);
                }
            }
            ScriptSleep(2000);
        }

        public LSL_List llParcelMediaQuery(LSL_List aList)
        {
            m_host.AddScriptLPS(1);
            LSL_List list = new LSL_List();
            //TO DO: make the implementation for the missing commands
            //PARCEL_MEDIA_COMMAND_LOOP_SET    float loop      Use this to get or set the parcel's media loop duration. (1.19.1 RC0 or later)
            for (int i = 0; i < aList.Data.Length; i++)
            {

                if (aList.Data[i] != null)
                {
                    switch ((ParcelMediaCommandEnum) aList.Data[i])
                    {
                        case ParcelMediaCommandEnum.Url:
                            list.Add(new LSL_String(World.GetLandData(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).MediaURL));
                            break;
                        case ParcelMediaCommandEnum.Desc:
                            list.Add(new LSL_String(World.GetLandData(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).Description));
                            break;
                        case ParcelMediaCommandEnum.Texture:
                            list.Add(new LSL_String(World.GetLandData(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).MediaID.ToString()));
                            break;
                        case ParcelMediaCommandEnum.Type:
                            list.Add(new LSL_String(World.GetLandData(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).MediaType));
                            break;
                        case ParcelMediaCommandEnum.Size:
                            list.Add(new LSL_String(World.GetLandData(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).MediaSize[0]));
                            list.Add(new LSL_String(World.GetLandData(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).MediaSize[1]));
                            break;
                        default:
                            ParcelMediaCommandEnum mediaCommandEnum = ParcelMediaCommandEnum.Url;
                            NotImplemented("llParcelMediaQuery parameter do not supported yet: " + Enum.Parse(mediaCommandEnum.GetType() , aList.Data[i].ToString()).ToString());
                            break;
                    }

                }
            }
            ScriptSleep(2000);
            return list;
        }

        public LSL_Integer llModPow(int a, int b, int c)
        {
            m_host.AddScriptLPS(1);
            Int64 tmp = 0;
            Math.DivRem(Convert.ToInt64(Math.Pow(a, b)), c, out tmp);
            ScriptSleep(1000);
            return Convert.ToInt32(tmp);
        }

        public LSL_Integer llGetInventoryType(string name)
        {
            m_host.AddScriptLPS(1);

            m_host.TaskInventory.LockItemsForRead(true);
            foreach (KeyValuePair<UUID, TaskInventoryItem> inv in m_host.TaskInventory)
            {
                if (inv.Value.Name == name)
                {
                    m_host.TaskInventory.LockItemsForRead(false);
                    return inv.Value.Type;
                }
            }
            m_host.TaskInventory.LockItemsForRead(false);

            return -1;
        }

        public void llSetPayPrice(int price, LSL_List quick_pay_buttons)
        {
            m_host.AddScriptLPS(1);

            if (quick_pay_buttons.Data.Length < 4)
            {
                int x;
                for (x=quick_pay_buttons.Data.Length; x<= 4; x++)
                {
                    quick_pay_buttons.Add(ScriptBaseClass.PAY_HIDE);
                }
            }
            int[] nPrice = new int[5];
            nPrice[0]=price;
            nPrice[1] = (LSL_Integer)quick_pay_buttons.Data[0];
            nPrice[2] = (LSL_Integer)quick_pay_buttons.Data[1];
            nPrice[3] = (LSL_Integer)quick_pay_buttons.Data[2];
            nPrice[4] = (LSL_Integer)quick_pay_buttons.Data[3];
            m_host.ParentGroup.RootPart.PayPrice = nPrice;
            m_host.ParentGroup.HasGroupChanged = true;
        }

        public LSL_Vector llGetCameraPos()
        {
            m_host.AddScriptLPS(1);
            UUID invItemID = InventorySelf();

            if (invItemID == UUID.Zero)
                return new LSL_Vector();

            m_host.TaskInventory.LockItemsForRead(true);
            if (m_host.TaskInventory[invItemID].PermsGranter == UUID.Zero)
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return new LSL_Vector();
            }

            if ((m_host.TaskInventory[invItemID].PermsMask & ScriptBaseClass.PERMISSION_TRACK_CAMERA) == 0)
            {
                ShoutError("No permissions to track the camera");
                m_host.TaskInventory.LockItemsForRead(false);
                return new LSL_Vector();
            }
            m_host.TaskInventory.LockItemsForRead(false);

            ScenePresence presence = World.GetScenePresence(m_host.OwnerID);
            if (presence != null)
            {
                LSL_Vector pos = new LSL_Vector(presence.CameraPosition.X, presence.CameraPosition.Y, presence.CameraPosition.Z);
                return pos;
            }
            return new LSL_Vector();
        }

        public LSL_Rotation llGetCameraRot()
        {
            m_host.AddScriptLPS(1);
            UUID invItemID = InventorySelf();
            if (invItemID == UUID.Zero)
                return new LSL_Rotation();

            m_host.TaskInventory.LockItemsForRead(true);
            if (m_host.TaskInventory[invItemID].PermsGranter == UUID.Zero)
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return new LSL_Rotation();
            }
            if ((m_host.TaskInventory[invItemID].PermsMask & ScriptBaseClass.PERMISSION_TRACK_CAMERA) == 0)
            {
                ShoutError("No permissions to track the camera");
                m_host.TaskInventory.LockItemsForRead(false);
                return new LSL_Rotation();
            }
            m_host.TaskInventory.LockItemsForRead(false);

            ScenePresence presence = World.GetScenePresence(m_host.OwnerID);
            if (presence != null)
            {
                return new LSL_Rotation(presence.CameraRotation.X, presence.CameraRotation.Y, presence.CameraRotation.Z, presence.CameraRotation.W);
            }

            return new LSL_Rotation();
        }

        /// <summary>
        /// The SL implementation does nothing, it is deprecated
        /// This duplicates SL
        /// </summary>
        public void llSetPrimURL(string url)
        {
            m_host.AddScriptLPS(1);
            ScriptSleep(2000);
        }

        /// <summary>
        /// The SL implementation shouts an error, it is deprecated
        /// This duplicates SL
        /// </summary>
        public void llRefreshPrimURL()
        {
            m_host.AddScriptLPS(1);
            ShoutError("llRefreshPrimURL - not yet supported");
            ScriptSleep(20000);
        }

        public LSL_String llEscapeURL(string url)
        {
            m_host.AddScriptLPS(1);
            try
            {
                return Uri.EscapeDataString(url);
            }
            catch (Exception ex)
            {
                return "llEscapeURL: " + ex.ToString();
            }
        }

        public LSL_String llUnescapeURL(string url)
        {
            m_host.AddScriptLPS(1);
            try
            {
                return Uri.UnescapeDataString(url);
            }
            catch (Exception ex)
            {
                return "llUnescapeURL: " + ex.ToString();
            }
        }

        public void llMapDestination(string simname, LSL_Vector pos, LSL_Vector lookAt)
        {
            m_host.AddScriptLPS(1);
            DetectParams detectedParams = m_ScriptEngine.GetDetectParams(m_itemID, 0);
            if (detectedParams == null) return; // only works on the first detected avatar

            ScenePresence avatar = World.GetScenePresence(detectedParams.Key);
            if (avatar != null)
            {
                avatar.ControllingClient.SendScriptTeleportRequest(m_host.Name, simname,
                                                                   new Vector3((float)pos.x, (float)pos.y, (float)pos.z),
                                                                   new Vector3((float)lookAt.x, (float)lookAt.y, (float)lookAt.z));
            }
            ScriptSleep(1000);
        }

        public void llAddToLandBanList(string avatar, double hours)
        {
            m_host.AddScriptLPS(1);
            UUID key;
            LandData land = World.LandChannel.GetLandObject(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).LandData;
            if (land.OwnerID == m_host.OwnerID)
            {
                ParcelManager.ParcelAccessEntry entry = new ParcelManager.ParcelAccessEntry();
                if (UUID.TryParse(avatar, out key))
                {
                    entry.AgentID = key;
                    entry.Flags = AccessList.Ban;
                    entry.Time = DateTime.Now.AddHours(hours);
                    land.ParcelAccessList.Add(entry);
                }
            }
            ScriptSleep(100);
        }

        public void llRemoveFromLandPassList(string avatar)
        {
            m_host.AddScriptLPS(1);
            UUID key;
            LandData land = World.LandChannel.GetLandObject(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).LandData;
            if (land.OwnerID == m_host.OwnerID)
            {
                if (UUID.TryParse(avatar, out key))
                {
                    foreach (ParcelManager.ParcelAccessEntry entry in land.ParcelAccessList)
                    {
                        if (entry.AgentID == key && entry.Flags == AccessList.Access)
                        {
                            land.ParcelAccessList.Remove(entry);
                            break;
                        }
                    }
                }
            }
            ScriptSleep(100);
        }

        public void llRemoveFromLandBanList(string avatar)
        {
            m_host.AddScriptLPS(1);
            UUID key;
            LandData land = World.LandChannel.GetLandObject(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).LandData;
            if (land.OwnerID == m_host.OwnerID)
            {
                if (UUID.TryParse(avatar, out key))
                {
                    foreach (ParcelManager.ParcelAccessEntry entry in land.ParcelAccessList)
                    {
                        if (entry.AgentID == key && entry.Flags == AccessList.Ban)
                        {
                            land.ParcelAccessList.Remove(entry);
                            break;
                        }
                    }
                }
            }
            ScriptSleep(100);
        }

        public void llSetCameraParams(LSL_List rules)
        {
            m_host.AddScriptLPS(1);

            // our key in the object we are in
            UUID invItemID = InventorySelf();
            if (invItemID == UUID.Zero) return;

            // the object we are in
            UUID objectID = m_host.ParentUUID;
            if (objectID == UUID.Zero) return;

            UUID agentID;
            m_host.TaskInventory.LockItemsForRead(true);
            // we need the permission first, to know which avatar we want to set the camera for
            agentID = m_host.TaskInventory[invItemID].PermsGranter;

            if (agentID == UUID.Zero)
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            if ((m_host.TaskInventory[invItemID].PermsMask & ScriptBaseClass.PERMISSION_CONTROL_CAMERA) == 0)
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            m_host.TaskInventory.LockItemsForRead(false);

            ScenePresence presence = World.GetScenePresence(agentID);

            // we are not interested in child-agents
            if (presence.IsChildAgent) return;

            SortedDictionary<int, float> parameters = new SortedDictionary<int, float>();
            object[] data = rules.Data;
            for (int i = 0; i < data.Length; ++i) {
                int type = Convert.ToInt32(data[i++].ToString());
                if (i >= data.Length) break; // odd number of entries => ignore the last

                // some special cases: Vector parameters are split into 3 float parameters (with type+1, type+2, type+3)
                switch (type) {
                case ScriptBaseClass.CAMERA_FOCUS:
                case ScriptBaseClass.CAMERA_FOCUS_OFFSET:
                case ScriptBaseClass.CAMERA_POSITION:
                    LSL_Vector v = (LSL_Vector)data[i];
                    parameters.Add(type + 1, (float)v.x);
                    parameters.Add(type + 2, (float)v.y);
                    parameters.Add(type + 3, (float)v.z);
                    break;
                default:
                    // TODO: clean that up as soon as the implicit casts are in
                    if (data[i] is LSL_Float)
                        parameters.Add(type, (float)((LSL_Float)data[i]).value);
                    else if (data[i] is LSL_Integer)
                        parameters.Add(type, (float)((LSL_Integer)data[i]).value);
                    else parameters.Add(type, Convert.ToSingle(data[i]));
                    break;
                }
            }
            if (parameters.Count > 0) presence.ControllingClient.SendSetFollowCamProperties(objectID, parameters);
        }

        public void llClearCameraParams()
        {
            m_host.AddScriptLPS(1);

            // our key in the object we are in
            UUID invItemID=InventorySelf();
            if (invItemID == UUID.Zero) return;

            // the object we are in
            UUID objectID = m_host.ParentUUID;
            if (objectID == UUID.Zero) return;

            // we need the permission first, to know which avatar we want to clear the camera for
            UUID agentID;
            m_host.TaskInventory.LockItemsForRead(true);
            agentID = m_host.TaskInventory[invItemID].PermsGranter;
            if (agentID == UUID.Zero)
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            if ((m_host.TaskInventory[invItemID].PermsMask & ScriptBaseClass.PERMISSION_CONTROL_CAMERA) == 0)
            {
                m_host.TaskInventory.LockItemsForRead(false);
                return;
            }
            m_host.TaskInventory.LockItemsForRead(false);

            ScenePresence presence = World.GetScenePresence(agentID);

            // we are not interested in child-agents
            if (presence.IsChildAgent) return;

            presence.ControllingClient.SendClearFollowCamProperties(objectID);
        }

        public LSL_Float llListStatistics(int operation, LSL_List src)
        {
            m_host.AddScriptLPS(1);
            LSL_List nums = LSL_List.ToDoubleList(src);
            switch (operation)
            {
                case ScriptBaseClass.LIST_STAT_RANGE:
                    return nums.Range();
                case ScriptBaseClass.LIST_STAT_MIN:
                    return nums.Min();
                case ScriptBaseClass.LIST_STAT_MAX:
                    return nums.Max();
                case ScriptBaseClass.LIST_STAT_MEAN:
                    return nums.Mean();
                case ScriptBaseClass.LIST_STAT_MEDIAN:
                    return nums.Median();
                case ScriptBaseClass.LIST_STAT_NUM_COUNT:
                    return nums.NumericLength();
                case ScriptBaseClass.LIST_STAT_STD_DEV:
                    return nums.StdDev();
                case ScriptBaseClass.LIST_STAT_SUM:
                    return nums.Sum();
                case ScriptBaseClass.LIST_STAT_SUM_SQUARES:
                    return nums.SumSqrs();
                case ScriptBaseClass.LIST_STAT_GEOMETRIC_MEAN:
                    return nums.GeometricMean();
                case ScriptBaseClass.LIST_STAT_HARMONIC_MEAN:
                    return nums.HarmonicMean();
                default:
                    return 0.0;
            }
        }

        public LSL_Integer llGetUnixTime()
        {
            m_host.AddScriptLPS(1);
            return Util.UnixTimeSinceEpoch();
        }

        public LSL_Integer llGetParcelFlags(LSL_Vector pos)
        {
            m_host.AddScriptLPS(1);
            return (int)World.LandChannel.GetLandObject((float)pos.x, (float)pos.y).LandData.Flags;
        }

        public LSL_Integer llGetRegionFlags()
        {
            m_host.AddScriptLPS(1);
            IEstateModule estate = World.RequestModuleInterface<IEstateModule>();
            if (estate == null)
                return 67108864;
            return (int)estate.GetRegionFlags();
        }

        public LSL_String llXorBase64StringsCorrect(string str1, string str2)
        {
            m_host.AddScriptLPS(1);
            string ret = String.Empty;
            string src1 = llBase64ToString(str1);
            string src2 = llBase64ToString(str2);
            int c = 0;
            for (int i = 0; i < src1.Length; i++)
            {
                ret += (char) (src1[i] ^ src2[c]);

                c++;
                if (c >= src2.Length)
                    c = 0;
            }
            return llStringToBase64(ret);
        }

        public LSL_String llHTTPRequest(string url, LSL_List parameters, string body)
        {
            // Partial implementation: support for parameter flags needed
            //   see http://wiki.secondlife.com/wiki/LlHTTPRequest
            // parameter flags support are implemented in ScriptsHttpRequests.cs
            //   in StartHttpRequest

            m_host.AddScriptLPS(1);
            IHttpRequestModule httpScriptMod =
                m_ScriptEngine.World.RequestModuleInterface<IHttpRequestModule>();
            List<string> param = new List<string>();
            foreach (object o in parameters.Data)
            {
                param.Add(o.ToString());
            }

            Vector3 position = m_host.AbsolutePosition;
            Vector3 velocity = m_host.Velocity;
            Quaternion rotation = m_host.RotationOffset;
            string ownerName = String.Empty;
            ScenePresence scenePresence = World.GetScenePresence(m_host.OwnerID);
            if (scenePresence == null)
                ownerName = resolveName(m_host.OwnerID);
            else
                ownerName = scenePresence.Name;

            RegionInfo regionInfo = World.RegionInfo;

            Dictionary<string, string> httpHeaders = new Dictionary<string, string>();

            string shard = "OpenSim";
            IConfigSource config = m_ScriptEngine.ConfigSource;
            if (config.Configs["Network"] != null)
            {
                shard = config.Configs["Network"].GetString(
                    "user_server_url", "http://127.0.0.1:" + ConfigSettings.DefaultUserServerHttpPort.ToString());
                shard = config.Configs["Network"].GetString("shard", shard);
            }

            httpHeaders["X-SecondLife-Shard"] = shard;
            httpHeaders["X-SecondLife-Object-Name"] = m_host.Name;
            httpHeaders["X-SecondLife-Object-Key"] = m_host.UUID.ToString();
            httpHeaders["X-SecondLife-Region"] = string.Format("{0} ({1}, {2})", regionInfo.RegionName, regionInfo.RegionLocX, regionInfo.RegionLocY);
            httpHeaders["X-SecondLife-Local-Position"] = string.Format("({0:0.000000}, {1:0.000000}, {2:0.000000})", position.X, position.Y, position.Z);
            httpHeaders["X-SecondLife-Local-Velocity"] = string.Format("({0:0.000000}, {1:0.000000}, {2:0.000000})", velocity.X, velocity.Y, velocity.Z);
            httpHeaders["X-SecondLife-Local-Rotation"] = string.Format("({0:0.000000}, {1:0.000000}, {2:0.000000}, {3:0.000000})", rotation.X, rotation.Y, rotation.Z, rotation.W);
            httpHeaders["X-SecondLife-Owner-Name"] = ownerName;
            httpHeaders["X-SecondLife-Owner-Key"] = m_host.OwnerID.ToString();
            string userAgent = config.Configs["Network"].GetString("user_agent", null);
            if (userAgent != null)
                httpHeaders["User-Agent"] = userAgent;

            string authregex = @"^(https?:\/\/)(\w+):(\w+)@(.*)$";
            Regex r = new Regex(authregex);
            int[] gnums = r.GetGroupNumbers();
            Match m = r.Match(url);
            if (m.Success) {
                for (int i = 1; i < gnums.Length; i++) {
                    //System.Text.RegularExpressions.Group g = m.Groups[gnums[i]];
                    //CaptureCollection cc = g.Captures;
                }
                if (m.Groups.Count == 5) {
                    httpHeaders["Authorization"] = String.Format("Basic {0}", Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(m.Groups[2].ToString() + ":" + m.Groups[3].ToString())));
                    url = m.Groups[1].ToString() + m.Groups[4].ToString();
                }
            }

            UUID reqID = httpScriptMod.
                StartHttpRequest(m_localID, m_itemID, url, param, httpHeaders, body);

            if (reqID != UUID.Zero)
                return reqID.ToString();
            else
                return null;
        }


        public void llHTTPResponse(LSL_Key id, int status, string body)
        {
            // Partial implementation: support for parameter flags needed
            //   see http://wiki.secondlife.com/wiki/llHTTPResponse

            m_host.AddScriptLPS(1);

            if (m_UrlModule != null)
                m_UrlModule.HttpResponse(new UUID(id), status,body);
        }

        public void llResetLandBanList()
        {
            m_host.AddScriptLPS(1);
            LandData land = World.LandChannel.GetLandObject(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).LandData;
            if (land.OwnerID == m_host.OwnerID)
            {
                foreach (ParcelManager.ParcelAccessEntry entry in land.ParcelAccessList)
                {
                    if (entry.Flags == AccessList.Ban)
                    {
                        land.ParcelAccessList.Remove(entry);
                    }
                }
            }
            ScriptSleep(100);
        }

        public void llResetLandPassList()
        {
            m_host.AddScriptLPS(1);
            LandData land = World.LandChannel.GetLandObject(m_host.AbsolutePosition.X, m_host.AbsolutePosition.Y).LandData;
            if (land.OwnerID == m_host.OwnerID)
            {
                foreach (ParcelManager.ParcelAccessEntry entry in land.ParcelAccessList)
                {
                    if (entry.Flags == AccessList.Access)
                    {
                        land.ParcelAccessList.Remove(entry);
                    }
                }
            }
            ScriptSleep(100);
        }

        public LSL_Integer llGetParcelPrimCount(LSL_Vector pos, int category, int sim_wide)
        {
            m_host.AddScriptLPS(1);

            LandData land = World.GetLandData((float)pos.x, (float)pos.y);

            if (land == null)
            {
                return 0;
            }

            else
            {
                if (sim_wide != 0)
                {
                    if (category == 0)
                    {
                        return land.SimwidePrims;
                    }

                    else
                    {
                        //public int simwideArea = 0;
                        return 0;
                    }
                }

                else
                {
                    if (category == 0)//Total Prims
                    {
                        return 0;//land.
                    }

                    else if (category == 1)//Owner Prims
                    {
                        return land.OwnerPrims;
                    }

                    else if (category == 2)//Group Prims
                    {
                        return land.GroupPrims;
                    }

                    else if (category == 3)//Other Prims
                    {
                        return land.OtherPrims;
                    }

                    else if (category == 4)//Selected
                    {
                        return land.SelectedPrims;
                    }

                    else if (category == 5)//Temp
                    {
                        return 0;//land.
                    }
                }
            }
            return 0;
        }

        public LSL_List llGetParcelPrimOwners(LSL_Vector pos)
        {
            m_host.AddScriptLPS(1);
            LandObject land = (LandObject)World.LandChannel.GetLandObject((float)pos.x, (float)pos.y);
            LSL_List ret = new LSL_List();
            if (land != null)
            {
                foreach (KeyValuePair<UUID, int> detectedParams in land.GetLandObjectOwners())
                {
                    ret.Add(detectedParams.Key.ToString());
                    ret.Add(detectedParams.Value);
                }
            }
            ScriptSleep(2000);
            return ret;
        }

        public LSL_Integer llGetObjectPrimCount(string object_id)
        {
            m_host.AddScriptLPS(1);
            SceneObjectPart part = World.GetSceneObjectPart(new UUID(object_id));
            if (part == null)
            {
                return 0;
            }
            else
            {
                return part.ParentGroup.PrimCount;
            }
        }

        public LSL_Integer llGetParcelMaxPrims(LSL_Vector pos, int sim_wide)
        {
            m_host.AddScriptLPS(1);
            // Alondria: This currently just is utilizing the normal grid's 0.22 prims/m2 calculation
            // Which probably will be irrelevent in OpenSim....
            LandData land = World.GetLandData((float)pos.x, (float)pos.y);

            float bonusfactor = (float)World.RegionInfo.RegionSettings.ObjectBonus;

            if (land == null)
            {
                return 0;
            }

            if (sim_wide != 0)
            {
                decimal v = land.SimwideArea * (decimal)(0.22) * (decimal)bonusfactor;

                return (int)v;
            }

            else
            {
                decimal v = land.Area * (decimal)(0.22) * (decimal)bonusfactor;

                return (int)v;
            }

        }

        public LSL_List llGetParcelDetails(LSL_Vector pos, LSL_List param)
        {
            m_host.AddScriptLPS(1);
            LandData land = World.GetLandData((float)pos.x, (float)pos.y);
            if (land == null)
            {
                return new LSL_List(0);
            }
            LSL_List ret = new LSL_List();
            foreach (object o in param.Data)
            {
                switch (o.ToString())
                {
                    case "0":
                        ret = ret + new LSL_List(land.Name);
                        break;
                    case "1":
                        ret = ret + new LSL_List(land.Description);
                        break;
                    case "2":
                        ret = ret + new LSL_List(land.OwnerID.ToString());
                        break;
                    case "3":
                        ret = ret + new LSL_List(land.GroupID.ToString());
                        break;
                    case "4":
                        ret = ret + new LSL_List(land.Area);
                        break;
                    default:
                        ret = ret + new LSL_List(0);
                        break;
                }
            }
            return ret;
        }

        public LSL_String llStringTrim(string src, int type)
        {
            m_host.AddScriptLPS(1);
            if (type == (int)ScriptBaseClass.STRING_TRIM_HEAD) { return src.TrimStart(); }
            if (type == (int)ScriptBaseClass.STRING_TRIM_TAIL) { return src.TrimEnd(); }
            if (type == (int)ScriptBaseClass.STRING_TRIM) { return src.Trim(); }
            return src;
        }

        public LSL_List llGetObjectDetails(string id, LSL_List args)
        {
            m_host.AddScriptLPS(1);
            LSL_List ret = new LSL_List();
            UUID key = new UUID();
            if (UUID.TryParse(id, out key))
            {
                ScenePresence av = World.GetScenePresence(key);

                if (av != null)
                {
                    foreach (object o in args.Data)
                    {
                        switch (o.ToString())
                        {
                            case "1":
                                ret.Add(av.Firstname + " " + av.Lastname);
                                break;
                            case "2":
                                ret.Add("");
                                break;
                            case "3":
                                ret.Add(new LSL_Vector((double)av.AbsolutePosition.X, (double)av.AbsolutePosition.Y, (double)av.AbsolutePosition.Z));
                                break;
                            case "4":
                                ret.Add(new LSL_Rotation((double)av.Rotation.X, (double)av.Rotation.Y, (double)av.Rotation.Z, (double)av.Rotation.W));
                                break;
                            case "5":
                                ret.Add(new LSL_Vector(av.Velocity.X, av.Velocity.Y, av.Velocity.Z));
                                break;
                            case "6":
                                ret.Add(id);
                                break;
                            case "7":
                                ret.Add(UUID.Zero.ToString());
                                break;
                            case "8":
                                ret.Add(UUID.Zero.ToString());
                                break;
                        }
                    }
                    return ret;
                }
                SceneObjectPart obj = World.GetSceneObjectPart(key);
                if (obj != null)
                {
                    foreach (object o in args.Data)
                    {
                        switch (o.ToString())
                        {
                            case "1":
                                ret.Add(obj.Name);
                                break;
                            case "2":
                                ret.Add(obj.Description);
                                break;
                            case "3":
                                ret.Add(new LSL_Vector(obj.AbsolutePosition.X, obj.AbsolutePosition.Y, obj.AbsolutePosition.Z));
                                break;
                            case "4":
                                ret.Add(new LSL_Rotation(obj.RotationOffset.X, obj.RotationOffset.Y, obj.RotationOffset.Z, obj.RotationOffset.W));
                                break;
                            case "5":
                                ret.Add(new LSL_Vector(obj.Velocity.X, obj.Velocity.Y, obj.Velocity.Z));
                                break;
                            case "6":
                                ret.Add(obj.OwnerID.ToString());
                                break;
                            case "7":
                                ret.Add(obj.GroupID.ToString());
                                break;
                            case "8":
                                ret.Add(obj.CreatorID.ToString());
                                break;
                        }
                    }
                    return ret;
                }
            }
            return new LSL_List();
        }

        internal UUID ScriptByName(string name)
        {
            m_host.TaskInventory.LockItemsForRead(true);

            foreach (TaskInventoryItem item in m_host.TaskInventory.Values)
            {
                if (item.Type == 10 && item.Name == name)
                {
                    m_host.TaskInventory.LockItemsForRead(false);
                    return item.ItemID;
                }
            }

            m_host.TaskInventory.LockItemsForRead(false);

            return UUID.Zero;
        }

        internal void ShoutError(string msg)
        {
            llShout(ScriptBaseClass.DEBUG_CHANNEL, msg);
        }

        internal void NotImplemented(string command)
        {
            if (throwErrorOnNotImplemented)
                throw new NotImplementedException("Command not implemented: " + command);
        }

        internal void Deprecated(string command)
        {
            throw new Exception("Command deprecated: " + command);
        }

        internal void LSLError(string msg)
        {
            throw new Exception("LSL Runtime Error: " + msg);
        }

        public delegate void AssetRequestCallback(UUID assetID, AssetBase asset);
        protected void WithNotecard(UUID assetID, AssetRequestCallback cb)
        {
            World.AssetService.Get(assetID.ToString(), this,
                delegate(string i, object sender, AssetBase a)
                {
                    UUID uuid = UUID.Zero;
                    UUID.TryParse(i, out uuid);
                    cb(uuid, a);
                });
        }

        public LSL_String llGetNumberOfNotecardLines(string name)
        {
            m_host.AddScriptLPS(1);

            //Clone is thread safe
            TaskInventoryDictionary itemsDictionary = (TaskInventoryDictionary)m_host.TaskInventory.Clone();

            UUID assetID = UUID.Zero;

            if (!UUID.TryParse(name, out assetID))
            {
                foreach (TaskInventoryItem item in itemsDictionary.Values)
                {
                    if (item.Type == 7 && item.Name == name)
                    {
                        assetID = item.AssetID;
                        break;
                    }
                }
            }

            if (assetID == UUID.Zero)
            {
                // => complain loudly, as specified by the LSL docs
                ShoutError("Notecard '" + name + "' could not be found.");

                return UUID.Zero.ToString();
            }

            // was: UUID tid = tid = AsyncCommands.
            UUID tid = AsyncCommands.DataserverPlugin.RegisterRequest(m_localID, m_itemID, assetID.ToString());

            if (NotecardCache.IsCached(assetID))
            {
                AsyncCommands.
                DataserverPlugin.DataserverReply(assetID.ToString(),
                NotecardCache.GetLines(assetID).ToString());
                ScriptSleep(100);
                return tid.ToString();
            }

            WithNotecard(assetID, delegate (UUID id, AssetBase a)
            {
                if (a == null || a.Type != 7)
                {
                    ShoutError("Notecard '" + name + "' could not be found.");
                    return;
                }

                System.Text.UTF8Encoding enc =
                    new System.Text.UTF8Encoding();
                string data = enc.GetString(a.Data);
                //m_log.Debug(data);
                NotecardCache.Cache(id, data);
                AsyncCommands.
                        DataserverPlugin.DataserverReply(id.ToString(),
                        NotecardCache.GetLines(id).ToString());
            });

            ScriptSleep(100);
            return tid.ToString();
        }

        public LSL_String llGetNotecardLine(string name, int line)
        {
            m_host.AddScriptLPS(1);

            //Clone is thread safe
            TaskInventoryDictionary itemsDictionary = (TaskInventoryDictionary)m_host.TaskInventory.Clone();

            UUID assetID = UUID.Zero;

            if (!UUID.TryParse(name, out assetID))
            {
                foreach (TaskInventoryItem item in itemsDictionary.Values)
                {
                    if (item.Type == 7 && item.Name == name)
                    {
                        assetID = item.AssetID;
                        break;
                    }
                }
            }

            if (assetID == UUID.Zero)
            {
                // => complain loudly, as specified by the LSL docs
                ShoutError("Notecard '" + name + "' could not be found.");

                return UUID.Zero.ToString();
            }

            // was: UUID tid = tid = AsyncCommands.
            UUID tid = AsyncCommands.DataserverPlugin.RegisterRequest(m_localID, m_itemID, assetID.ToString());

            if (NotecardCache.IsCached(assetID))
            {
                AsyncCommands.DataserverPlugin.DataserverReply(assetID.ToString(),
                                                               NotecardCache.GetLine(assetID, line, m_notecardLineReadCharsMax));
                ScriptSleep(100);
                return tid.ToString();
            }

            WithNotecard(assetID, delegate (UUID id, AssetBase a)
                         {
                             if (a == null || a.Type != 7)
                             {
                                 ShoutError("Notecard '" + name + "' could not be found.");
                                 return;
                             }

                             System.Text.UTF8Encoding enc =
                                 new System.Text.UTF8Encoding();
                             string data = enc.GetString(a.Data);
                             //m_log.Debug(data);
                             NotecardCache.Cache(id, data);
                             AsyncCommands.DataserverPlugin.DataserverReply(id.ToString(),
                                                                            NotecardCache.GetLine(id, line, m_notecardLineReadCharsMax));
                         });

            ScriptSleep(100);
            return tid.ToString();
        }
    }

    public class NotecardCache
    {
        protected class Notecard
        {
            public string[] text;
            public DateTime lastRef;
        }

        protected static Dictionary<UUID, Notecard> m_Notecards =
            new Dictionary<UUID, Notecard>();

        public static void Cache(UUID assetID, string text)
        {
            CacheCheck();

            lock (m_Notecards)
            {
                if (m_Notecards.ContainsKey(assetID))
                    return;

                Notecard nc = new Notecard();
                nc.lastRef = DateTime.Now;
                nc.text = ParseText(text.Replace("\r", "").Split('\n'));
                m_Notecards[assetID] = nc;
            }
        }

        protected static string[] ParseText(string[] input)
        {
            int idx = 0;
            int level = 0;
            List<string> output = new List<string>();
            string[] words;

            while (idx < input.Length)
            {
                if (input[idx] == "{")
                {
                    level++;
                    idx++;
                    continue;
                }

                if (input[idx]== "}")
                {
                    level--;
                    idx++;
                    continue;
                }

                switch (level)
                {
                case 0:
                    words = input[idx].Split(' '); // Linden text ver
                    // Notecards are created *really* empty. Treat that as "no text" (just like after saving an empty notecard)
                    if (words.Length < 3)
                        return new String[0];

                    int version = int.Parse(words[3]);
                    if (version != 2)
                        return new String[0];
                    break;
                case 1:
                    words = input[idx].Split(' ');
                    if (words[0] == "LLEmbeddedItems")
                        break;
                    if (words[0] == "Text")
                    {
                        int len = int.Parse(words[2]);
                        idx++;

                        int count = -1;

                        while (count < len)
                        {
                            // int l = input[idx].Length;
                            string ln = input[idx];

                            int need = len-count-1;
                            if (ln.Length > need)
                                ln = ln.Substring(0, need);

                            output.Add(ln);
                            count += ln.Length + 1;
                            idx++;
                        }

                        return output.ToArray();
                    }
                    break;
                case 2:
                    words = input[idx].Split(' '); // count
                    if (words[0] == "count")
                    {
                        int c = int.Parse(words[1]);
                        if (c > 0)
                            return new String[0];
                        break;
                    }
                    break;
                }
                idx++;
            }
            return output.ToArray();
        }

        public static bool IsCached(UUID assetID)
        {
            lock (m_Notecards)
            {
                return m_Notecards.ContainsKey(assetID);
            }
        }

        public static int GetLines(UUID assetID)
        {
            if (!IsCached(assetID))
                return -1;

            lock (m_Notecards)
            {
                m_Notecards[assetID].lastRef = DateTime.Now;
                return m_Notecards[assetID].text.Length;
            }
        }

        public static string GetLine(UUID assetID, int line, int maxLength)
        {
            if (line < 0)
                return "";

            string data;

            if (!IsCached(assetID))
                return "";

            lock (m_Notecards)
            {
                m_Notecards[assetID].lastRef = DateTime.Now;

                if (line >= m_Notecards[assetID].text.Length)
                    return "\n\n\n";

                data = m_Notecards[assetID].text[line];
                if (data.Length > maxLength)
                    data = data.Substring(0, maxLength);

                return data;
            }
        }

        public static void CacheCheck()
        {
            foreach (UUID key in new List<UUID>(m_Notecards.Keys))
            {
                Notecard nc = m_Notecards[key];
                if (nc.lastRef.AddSeconds(30) < DateTime.Now)
                    m_Notecards.Remove(key);
            }
        }
    }
}