/*
 * 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 OpenSim 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.IO;
using System.Reflection;
using OpenMetaverse;
using log4net;
using OpenSim.Framework;
using OpenSim.Region.Environment.Interfaces;
using System.Collections.Generic;
using System.Xml;

namespace OpenSim.Region.Environment.Scenes
{
    public partial class SceneObjectGroup : EntityBase
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        /// <summary>
        /// Force all task inventories of prims in the scene object to persist
        /// </summary>
        public void ForceInventoryPersistence()
        {
            lock (m_parts)
            {
                foreach (SceneObjectPart part in m_parts.Values)
                {
                    part.ForceInventoryPersistence();
                }
            }
        }

        /// <summary>
        /// Start the scripts contained in all the prims in this group.
        /// </summary>
        public void CreateScriptInstances(int startParam, bool postOnRez,
                string engine, int stateSource)
        {
            // Don't start scripts if they're turned off in the region!
            if (!m_scene.RegionInfo.RegionSettings.DisableScripts)
            {
                foreach (SceneObjectPart part in m_parts.Values)
                {
                    part.CreateScriptInstances(startParam, postOnRez, engine,
                            stateSource);
                }
            }
        }

        /// <summary>
        /// Stop the scripts contained in all the prims in this group
        /// </summary>
        public void RemoveScriptInstances()
        {
            lock (m_parts)
            {
                foreach (SceneObjectPart part in m_parts.Values)
                {
                    part.RemoveScriptInstances();
                }
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="remoteClient"></param>
        /// <param name="localID"></param>
        public bool GetPartInventoryFileName(IClientAPI remoteClient, uint localID)
        {
            SceneObjectPart part = GetChildPart(localID);
            if (part != null)
            {
                return part.GetInventoryFileName(remoteClient, localID);
            }
            else
            {
                m_log.ErrorFormat(
                    "[PRIM INVENTORY]: " +
                    "Couldn't find part {0} in object group {1}, {2} to retreive prim inventory",
                    localID, Name, UUID);
            }
            return false;
        }

        /// <summary>
        /// Return serialized inventory metadata for the given constituent prim
        /// </summary>
        /// <param name="localID"></param>
        /// <param name="xferManager"></param>
        public void RequestInventoryFile(IClientAPI client, uint localID, IXfer xferManager)
        {
            SceneObjectPart part = GetChildPart(localID);
            if (part != null)
            {
                part.RequestInventoryFile(client, xferManager);
            }
            else
            {
                m_log.ErrorFormat(
                    "[PRIM INVENTORY]: " +
                    "Couldn't find part {0} in object group {1}, {2} to request inventory data",
                    localID, Name, UUID);
            }
        }

        /// <summary>
        /// Add an inventory item to a prim in this group.
        /// </summary>
        /// <param name="remoteClient"></param>
        /// <param name="localID"></param>
        /// <param name="item"></param>
        /// <param name="copyItemID">The item UUID that should be used by the new item.</param>
        /// <returns></returns>
        public bool AddInventoryItem(IClientAPI remoteClient, uint localID,
                                     InventoryItemBase item, UUID copyItemID)
        {
            UUID newItemId = (copyItemID != UUID.Zero) ? copyItemID : item.ID;

            SceneObjectPart part = GetChildPart(localID);
            if (part != null)
            {
                TaskInventoryItem taskItem = new TaskInventoryItem();

                taskItem.ItemID = newItemId;
                taskItem.AssetID = item.AssetID;
                taskItem.Name = item.Name;
                taskItem.Description = item.Description;
                taskItem.OwnerID = part.OwnerID; // Transfer ownership
                taskItem.CreatorID = item.Creator;
                taskItem.Type = item.AssetType;
                taskItem.InvType = item.InvType;

		if (remoteClient!=null && remoteClient.AgentId!=part.OwnerID &&
		    m_scene.ExternalChecks.ExternalChecksPropagatePermissions()) {
		    taskItem.BasePermissions = item.BasePermissions & item.NextPermissions;
		    taskItem.CurrentPermissions = item.CurrentPermissions & item.NextPermissions;
		    taskItem.EveryonePermissions = item.EveryOnePermissions & item.NextPermissions;
		    taskItem.NextPermissions = item.NextPermissions;
		    taskItem.CurrentPermissions |= 8;
		} else {
		    taskItem.BasePermissions = item.BasePermissions;
		    taskItem.CurrentPermissions = item.CurrentPermissions;
		    taskItem.CurrentPermissions |= 8;
		    taskItem.EveryonePermissions = item.EveryOnePermissions;
		    taskItem.NextPermissions = item.NextPermissions;
		}

			

                taskItem.Flags = item.Flags;
                // TODO: These are pending addition of those fields to TaskInventoryItem
//                taskItem.SalePrice = item.SalePrice;
//                taskItem.SaleType = item.SaleType;
                taskItem.CreationDate = (uint)item.CreationDate;
		
		bool addFromAllowedDrop = false;
		if (remoteClient!=null) 
		{
		    addFromAllowedDrop = remoteClient.AgentId!=part.OwnerID &&
			m_scene.ExternalChecks.ExternalChecksPropagatePermissions();
		}

                part.AddInventoryItem(taskItem, addFromAllowedDrop);

                return true;
            }
            else
            {
                m_log.ErrorFormat(
                    "[PRIM INVENTORY]: " +
                    "Couldn't find prim local ID {0} in group {1}, {2} to add inventory item ID {3}",
                    localID, Name, UUID, newItemId);
            }

            return false;
        }

        /// <summary>
        /// Returns an existing inventory item.  Returns the original, so any changes will be live.
        /// </summary>
        /// <param name="primID"></param>
        /// <param name="itemID"></param>
        /// <returns>null if the item does not exist</returns>
        public TaskInventoryItem GetInventoryItem(uint primID, UUID itemID)
        {
            SceneObjectPart part = GetChildPart(primID);
            if (part != null)
            {
                return part.GetInventoryItem(itemID);
            }
            else
            {
                m_log.ErrorFormat(
                    "[PRIM INVENTORY]: " +
                    "Couldn't find prim local ID {0} in prim {1}, {2} to get inventory item ID {3}",
                    primID, part.Name, part.UUID, itemID);
            }

            return null;
        }

        /// <summary>
        /// Update an existing inventory item.
        /// </summary>
        /// <param name="item">The updated item.  An item with the same id must already exist
        /// in this prim's inventory</param>
        /// <returns>false if the item did not exist, true if the update occurred succesfully</returns>
        public bool UpdateInventoryItem(TaskInventoryItem item)
        {
            SceneObjectPart part = GetChildPart(item.ParentPartID);
            if (part != null)
            {
                part.UpdateInventoryItem(item);

                return true;
            }
            else
            {
                m_log.ErrorFormat(
                    "[PRIM INVENTORY]: " +
                    "Couldn't find prim ID {0} to update item {1}, {2}",
                    item.ParentPartID, item.Name, item.ItemID);
            }

            return false;
        }

        public int RemoveInventoryItem(uint localID, UUID itemID)
        {
            SceneObjectPart part = GetChildPart(localID);
            if (part != null)
            {
                int type = part.RemoveInventoryItem(itemID);

                return type;
            }

            return -1;
        }

        public uint GetEffectivePermissions()
        {
            uint perms=(uint)(PermissionMask.Modify |
                              PermissionMask.Copy |
                              PermissionMask.Move |
                              PermissionMask.Transfer) | 7;

            uint ownerMask = 0x7ffffff;
            foreach (SceneObjectPart part in m_parts.Values)
            {
                ownerMask &= part.OwnerMask;
                perms &= part.MaskEffectivePermissions();
            }

            if ((ownerMask & (uint)PermissionMask.Modify) == 0)
                perms &= ~(uint)PermissionMask.Modify;
            if ((ownerMask & (uint)PermissionMask.Copy) == 0)
                perms &= ~(uint)PermissionMask.Copy;
            if ((ownerMask & (uint)PermissionMask.Transfer) == 0)
                perms &= ~(uint)PermissionMask.Transfer;

            if ((ownerMask & RootPart.NextOwnerMask & (uint)PermissionMask.Modify) == 0)
                perms &= ~((uint)PermissionMask.Modify >> 13);
            if ((ownerMask & RootPart.NextOwnerMask & (uint)PermissionMask.Copy) == 0)
                perms &= ~((uint)PermissionMask.Copy >> 13);
            if ((ownerMask & RootPart.NextOwnerMask & (uint)PermissionMask.Transfer) == 0)
                perms &= ~((uint)PermissionMask.Transfer >> 13);

            return perms;
        }

        public void ApplyNextOwnerPermissions()
        {
            foreach (SceneObjectPart part in m_parts.Values)
                part.ApplyNextOwnerPermissions();
        }

        public string GetStateSnapshot()
        {
            List<string> assemblies = new List<string>();
            Dictionary<UUID, string> states = new Dictionary<UUID, string>();

            foreach (SceneObjectPart part in m_parts.Values)
            {
                foreach (string a in part.GetScriptAssemblies())
                {
                    if (a != "" && !assemblies.Contains(a))
                        assemblies.Add(a);
                }

                foreach (KeyValuePair<UUID, string> s in part.GetScriptStates())
                {
                    states[s.Key] = s.Value;
                }
            }

            if (states.Count < 1 || assemblies.Count < 1)
                return "";

            XmlDocument xmldoc = new XmlDocument();

            XmlNode xmlnode = xmldoc.CreateNode(XmlNodeType.XmlDeclaration,
                    "", "");

            xmldoc.AppendChild(xmlnode);
            XmlElement rootElement = xmldoc.CreateElement("", "ScriptData",
                    "");
            
            xmldoc.AppendChild(rootElement);

            XmlElement wrapper = xmldoc.CreateElement("", "Assemblies",
                    "");
            
            rootElement.AppendChild(wrapper);

            foreach (string assembly in assemblies)
            {
                string fn = Path.GetFileName(assembly);
                if (fn == String.Empty)
                    continue;

                FileInfo fi = new FileInfo(assembly);

                if (fi == null)
                    continue;

                Byte[] data = new Byte[fi.Length];

                FileStream fs = File.Open(assembly, FileMode.Open, FileAccess.Read);
                fs.Read(data, 0, data.Length);
                fs.Close();

                XmlElement assemblyData = xmldoc.CreateElement("", "Assembly", "");
                XmlAttribute assemblyName = xmldoc.CreateAttribute("", "Filename", "");
                assemblyName.Value = fn;
                assemblyData.Attributes.Append(assemblyName);

                assemblyData.InnerText = System.Convert.ToBase64String(data);

                wrapper.AppendChild(assemblyData);
            }

            wrapper = xmldoc.CreateElement("", "ScriptStates",
                    "");
            
            rootElement.AppendChild(wrapper);

            foreach (KeyValuePair<UUID, string> state in states)
            {
                XmlElement stateData = xmldoc.CreateElement("", "State", "");

                XmlAttribute stateID = xmldoc.CreateAttribute("", "UUID", "");
                stateID.Value = state.Key.ToString();
                stateData.Attributes.Append(stateID);

                XmlDocument sdoc = new XmlDocument();
                sdoc.LoadXml(state.Value);
                XmlNodeList rootL = sdoc.GetElementsByTagName("ScriptState");
                XmlNode rootNode = rootL[0];

                XmlNode newNode = xmldoc.ImportNode(rootNode, true);
                stateData.AppendChild(newNode);
                wrapper.AppendChild(stateData);
            }

            return xmldoc.InnerXml;
        }
    }
}