/*
 * 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.
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
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 * 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
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 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections;
using System.Collections.Generic;
using libsecondlife;

using OpenSim.Framework;
using OpenSim.Framework.Communications.Cache;
using OpenSim.Framework.Console;
using OpenSim.Framework.Statistics;
using OpenSim.Framework.UserManagement;
using InventoryFolder=OpenSim.Framework.InventoryFolder;

namespace OpenSim.Region.Communications.Local
{
    public delegate void LoginToRegionEvent(ulong regionHandle, Login login);

    public class LocalLoginService : LoginService
    {
        private static readonly log4net.ILog m_log 
            = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        private CommunicationsLocal m_Parent;

        private NetworkServersInfo serversInfo;
        private uint defaultHomeX;
        private uint defaultHomeY;
        private bool authUsers = false;

        public event LoginToRegionEvent OnLoginToRegion;

        private LoginToRegionEvent handlerLoginToRegion = null; // OnLoginToRegion;

        public LocalLoginService(UserManagerBase userManager, string welcomeMess, 
                                 CommunicationsLocal parent, NetworkServersInfo serversInfo, 
                                 bool authenticate)
            : base(userManager, parent.UserProfileCacheService.libraryRoot, welcomeMess)
        {
            m_Parent = parent;
            this.serversInfo = serversInfo;
            defaultHomeX = this.serversInfo.DefaultHomeLocX;
            defaultHomeY = this.serversInfo.DefaultHomeLocY;
            authUsers = authenticate;
        }

        public override UserProfileData GetTheUser(string firstname, string lastname)
        {
            UserProfileData profile = m_userManager.GetUserProfile(firstname, lastname);
            if (profile != null)
            {
                return profile;
            }

            if (!authUsers)
            {
                //no current user account so make one
                m_log.Info("[LOGIN]: No user account found so creating a new one.");

                m_userManager.AddUserProfile(firstname, lastname, "test", defaultHomeX, defaultHomeY);

                profile = m_userManager.GetUserProfile(firstname, lastname);
                if (profile != null)
                {
                    m_Parent.InventoryService.CreateNewUserInventory(profile.UUID);
                }

                return profile;
            }
            return null;
        }

        public override bool AuthenticateUser(UserProfileData profile, string password)
        {
            if (!authUsers)
            {
                //for now we will accept any password in sandbox mode
                m_log.Info("[LOGIN]: Authorising user (no actual password check)");

                return true;
            }
            else
            {
                m_log.Info(
                    "[LOGIN]: Authenticating " + profile.username + " " + profile.surname);
               
                if (!password.StartsWith("$1$"))
                    password = "$1$" + Util.Md5Hash(password);

                password = password.Remove(0, 3); //remove $1$

                string s = Util.Md5Hash(password + ":" + profile.passwordSalt);

                bool loginresult = (profile.passwordHash.Equals(s.ToString(), StringComparison.InvariantCultureIgnoreCase)
                            || profile.passwordHash.Equals(password, StringComparison.InvariantCultureIgnoreCase));
                return loginresult;
            }
        }

        public override void CustomiseResponse(LoginResponse response, UserProfileData theUser, string startLocationRequest)
        {
            ulong currentRegion = 0;
            if (startLocationRequest == "last")
            {
                currentRegion = theUser.currentAgent.currentHandle;
            }
            else if (startLocationRequest == "home")
            {
                currentRegion = theUser.homeRegion;
            }
            else
            {
                m_log.Info("[LOGIN]: Got Custom Login URL, but can't process it");
                // LocalBackEndServices can't possibly look up a region by name :(
                // TODO: Parse string in the following format: 'uri:RegionName&X&Y&Z'
                currentRegion = theUser.currentAgent.currentHandle;
            }

            RegionInfo reg = m_Parent.GridService.RequestNeighbourInfo(currentRegion);

            if (reg != null)
            {
                response.Home = "{'region_handle':[r" + (reg.RegionLocX * Constants.RegionSize).ToString() + ",r" +
                                (reg.RegionLocY * Constants.RegionSize).ToString() + "], " +
                                "'position':[r" + theUser.homeLocation.X.ToString() + ",r" +
                                theUser.homeLocation.Y.ToString() + ",r" + theUser.homeLocation.Z.ToString() + "], " +
                                "'look_at':[r" + theUser.homeLocation.X.ToString() + ",r" +
                                theUser.homeLocation.Y.ToString() + ",r" + theUser.homeLocation.Z.ToString() + "]}";
                string capsPath = Util.GetRandomCapsPath();
                response.SimAddress = reg.ExternalEndPoint.Address.ToString();
                response.SimPort = (uint) reg.ExternalEndPoint.Port;
                response.RegionX = reg.RegionLocX;
                response.RegionY = reg.RegionLocY ;

                response.SeedCapability = "http://" + reg.ExternalHostName + ":" +
                                          serversInfo.HttpListenerPort.ToString() + "/CAPS/" + capsPath + "0000/";
                
                m_log.DebugFormat(
                    "[CAPS]: Sending new CAPS seed url {0} to client {1}", 
                    response.SeedCapability, response.AgentID);                

                theUser.currentAgent.currentRegion = reg.RegionID;
                theUser.currentAgent.currentHandle = reg.RegionHandle;

                LoginResponse.BuddyList buddyList = new LoginResponse.BuddyList();

                response.BuddList = ConvertFriendListItem(m_userManager.GetUserFriendList(theUser.UUID)); 

                Login _login = new Login();
                //copy data to login object
                _login.First = response.Firstname;
                _login.Last = response.Lastname;
                _login.Agent = response.AgentID;
                _login.Session = response.SessionID;
                _login.SecureSession = response.SecureSessionID;
                _login.CircuitCode = (uint) response.CircuitCode;
                _login.StartPos = new LLVector3(128, 128, 70);
                _login.CapsPath = capsPath;

                m_log.InfoFormat(
                    "[LOGIN]: Telling region {0} @ {1},{2} ({3}:{4}) to expect user connection", 
                    reg.RegionName, response.RegionX, response.RegionY, response.SimAddress, response.SimPort);                
                
                handlerLoginToRegion = OnLoginToRegion;
                if (handlerLoginToRegion != null)
                {
                    handlerLoginToRegion(currentRegion, _login);
                }
            }
            else
            {
                m_log.Warn("[LOGIN]: Not found region " + currentRegion);
            }
        }

        private LoginResponse.BuddyList ConvertFriendListItem(List<FriendListItem> LFL)
        {
            LoginResponse.BuddyList buddylistreturn = new LoginResponse.BuddyList();
            foreach (FriendListItem fl in LFL)
            {
                LoginResponse.BuddyList.BuddyInfo buddyitem = new LoginResponse.BuddyList.BuddyInfo(fl.Friend);
                buddyitem.BuddyID = fl.Friend;
                buddyitem.BuddyRightsHave = (int)fl.FriendListOwnerPerms;
                buddyitem.BuddyRightsGiven = (int)fl.FriendPerms;
                buddylistreturn.AddNewBuddy(buddyitem);
            }
            return buddylistreturn;
        }

        // See LoginService        
        protected override InventoryData GetInventorySkeleton(LLUUID userID)
        {
            List<InventoryFolderBase> folders = m_Parent.InventoryService.RequestFirstLevelFolders(userID);
            if (folders.Count > 0)
            {
                LLUUID rootID = LLUUID.Zero;
                ArrayList AgentInventoryArray = new ArrayList();
                Hashtable TempHash;
                foreach (InventoryFolderBase InvFolder in folders)
                {
                    if (InvFolder.parentID == LLUUID.Zero)
                    {
                        rootID = InvFolder.folderID;
                    }
                    TempHash = new Hashtable();
                    TempHash["name"] = InvFolder.name;
                    TempHash["parent_id"] = InvFolder.parentID.ToString();
                    TempHash["version"] = (Int32) InvFolder.version;
                    TempHash["type_default"] = (Int32) InvFolder.type;
                    TempHash["folder_id"] = InvFolder.folderID.ToString();
                    AgentInventoryArray.Add(TempHash);
                }
                return new InventoryData(AgentInventoryArray, rootID);
            }
            else
            {
                AgentInventory userInventory = new AgentInventory();
                userInventory.CreateRootFolder(userID);

                ArrayList AgentInventoryArray = new ArrayList();
                Hashtable TempHash;
                foreach (InventoryFolder InvFolder in userInventory.InventoryFolders.Values)
                {
                    TempHash = new Hashtable();
                    TempHash["name"] = InvFolder.FolderName;
                    TempHash["parent_id"] = InvFolder.ParentID.ToString();
                    TempHash["version"] = (Int32) InvFolder.Version;
                    TempHash["type_default"] = (Int32) InvFolder.DefaultType;
                    TempHash["folder_id"] = InvFolder.FolderID.ToString();
                    AgentInventoryArray.Add(TempHash);
                }

                return new InventoryData(AgentInventoryArray, userInventory.InventoryRoot.FolderID);
            }
        }
    }
}