using System;
using System.Collections.Generic;
using System.Reflection;
using log4net;
using Nini.Config;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;

namespace OpenSim.Region.CoreModules.World.Land
{
    public class PhysicsCombiner : ISharedRegionModule
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        public string Name { get { return "PhysicsCombiner";}  }
        public Type ReplaceableInterface
        {
            get { return null; }
        }

        public Type ReplacableInterface { get { return null; } }

        private Dictionary<UUID, RegionConnections> m_regions = new Dictionary<UUID, RegionConnections>();
        public void Initialise(IConfigSource source)
        {
            
        }

        public void Close()
        {
            
        }

        public void AddRegion(Scene scene)
        {
            /*
            RegionData regionData = new RegionData();
            regionData.Offset = Vector3.Zero;
            regionData.RegionId = scene.RegionInfo.originRegionID;
            regionData.RegionScene = scene;
            */
            RegionConnections regionConnections = new RegionConnections();
            regionConnections.ConnectedRegions = new List<RegionData>();
            regionConnections.RegionScene = scene;
            regionConnections.RegionId = scene.RegionInfo.originRegionID;
            regionConnections.X = scene.RegionInfo.RegionLocX;
            regionConnections.Y = scene.RegionInfo.RegionLocY;
            regionConnections.XEnd = (int)Constants.RegionSize;
            regionConnections.YEnd = (int)Constants.RegionSize;
            lock (m_regions)
            {
                bool connectedYN = false;

                foreach (RegionConnections conn in m_regions.Values)
                {

                    /*
                    // If we're one region over +x +y
                    //xxx
                    //xxx
                    //xxy
                    if ((((int)conn.X * (int)Constants.RegionSize) + conn.XEnd 
                        == (regionConnections.X * (int)Constants.RegionSize)) 
                        && (((int)conn.Y * (int)Constants.RegionSize) - conn.YEnd 
                        == (regionConnections.Y * (int)Constants.RegionSize)))
                    {
                        Vector3 offset = Vector3.Zero;
                        offset.X = (((regionConnections.X * (int) Constants.RegionSize)) -
                                    ((conn.X * (int) Constants.RegionSize)));
                        offset.Y = (((regionConnections.Y * (int) Constants.RegionSize)) -
                                    ((conn.Y * (int) Constants.RegionSize)));

                        Vector3 extents = Vector3.Zero;
                        extents.Y = regionConnections.YEnd + conn.YEnd;
                        extents.X = conn.XEnd + conn.XEnd;

                        m_log.DebugFormat("Scene: {0} to the northwest of Scene{1}.  Offset: {2}.  Extents:{3}",
                                          conn.RegionScene.RegionInfo.RegionName,
                                          regionConnections.RegionScene.RegionInfo.RegionName,
                                          offset, extents);

                        scene.PhysicsScene.Combine(conn.RegionScene.PhysicsScene, offset, extents);
                            
                        connectedYN = true;
                        break;
                    }
                    */

                    /*
                    //If we're one region over x +y
                    //xxx
                    //xxx
                    //xyx
                    if ((((int)conn.X * (int)Constants.RegionSize)
                        == (regionConnections.X * (int)Constants.RegionSize))
                        && (((int)conn.Y * (int)Constants.RegionSize) - conn.YEnd
                        == (regionConnections.Y * (int)Constants.RegionSize)))
                    {
                        Vector3 offset = Vector3.Zero;
                        offset.X = (((regionConnections.X * (int)Constants.RegionSize)) -
                                    ((conn.X * (int)Constants.RegionSize)));
                        offset.Y = (((regionConnections.Y * (int)Constants.RegionSize)) -
                                    ((conn.Y * (int)Constants.RegionSize)));

                        Vector3 extents = Vector3.Zero;
                        extents.Y = regionConnections.YEnd + conn.YEnd;
                        extents.X = conn.XEnd;

                        m_log.DebugFormat("Scene: {0} to the north of Scene{1}.  Offset: {2}. Extents:{3}",
                                          conn.RegionScene.RegionInfo.RegionName,
                                          regionConnections.RegionScene.RegionInfo.RegionName, offset, extents);

                        scene.PhysicsScene.Combine(conn.RegionScene.PhysicsScene, offset, extents);
                        connectedYN = true;
                        break;
                    }
                    */

                    /*
                    // If we're one region over -x +y
                    //xxx
                    //xxx
                    //yxx
                    if ((((int)conn.X * (int)Constants.RegionSize) - conn.XEnd
                        == (regionConnections.X * (int)Constants.RegionSize))
                        && (((int)conn.Y * (int)Constants.RegionSize) - conn.YEnd
                        == (regionConnections.Y * (int)Constants.RegionSize)))
                    {
                        Vector3 offset = Vector3.Zero;
                        offset.X = (((regionConnections.X * (int)Constants.RegionSize)) -
                                    ((conn.X * (int)Constants.RegionSize)));
                        offset.Y = (((regionConnections.Y * (int)Constants.RegionSize)) -
                                    ((conn.Y * (int)Constants.RegionSize)));

                        Vector3 extents = Vector3.Zero;
                        extents.Y = regionConnections.YEnd + conn.YEnd;
                        extents.X = conn.XEnd + conn.XEnd;

                        m_log.DebugFormat("Scene: {0} to the northeast of Scene.  Offset: {2}. Extents:{3}",
                                          conn.RegionScene.RegionInfo.RegionName,
                                          regionConnections.RegionScene.RegionInfo.RegionName, offset, extents);

                        scene.PhysicsScene.Combine(conn.RegionScene.PhysicsScene, offset, extents);


                        connectedYN = true;
                        break;
                    }
                    */

                    /*
                    // If we're one region over -x y
                    //xxx
                    //yxx
                    //xxx
                    if ((((int)conn.X * (int)Constants.RegionSize) - conn.XEnd
                        == (regionConnections.X * (int)Constants.RegionSize))
                        && (((int)conn.Y * (int)Constants.RegionSize)
                        == (regionConnections.Y * (int)Constants.RegionSize)))
                    {
                        Vector3 offset = Vector3.Zero;
                        offset.X = (((regionConnections.X * (int)Constants.RegionSize)) -
                                    ((conn.X * (int)Constants.RegionSize)));
                        offset.Y = (((regionConnections.Y * (int)Constants.RegionSize)) -
                                    ((conn.Y * (int)Constants.RegionSize)));

                        Vector3 extents = Vector3.Zero;
                        extents.Y = regionConnections.YEnd;
                        extents.X = conn.XEnd + conn.XEnd;

                        m_log.DebugFormat("Scene: {0} to the east of Scene{1} Offset: {2}. Extents:{3}",
                                          conn.RegionScene.RegionInfo.RegionName,
                                          regionConnections.RegionScene.RegionInfo.RegionName, offset, extents);

                        scene.PhysicsScene.Combine(conn.RegionScene.PhysicsScene, offset, extents);

                        connectedYN = true;
                        break;
                    }
                    */

                    // If we're one region over +x y
                    //xxx
                    //xxy
                    //xxx
                    if ((((int)conn.X * (int)Constants.RegionSize) + conn.XEnd
                        == (regionConnections.X * (int)Constants.RegionSize))
                        && (((int)conn.Y * (int)Constants.RegionSize)
                        == (regionConnections.Y * (int)Constants.RegionSize)))
                    {
                        Vector3 offset = Vector3.Zero;
                        offset.X = (((regionConnections.X * (int)Constants.RegionSize)) -
                                    ((conn.X * (int)Constants.RegionSize)));
                        offset.Y = (((regionConnections.Y * (int)Constants.RegionSize)) -
                                    ((conn.Y * (int)Constants.RegionSize)));

                        Vector3 extents = Vector3.Zero;
                        extents.Y = regionConnections.YEnd;
                        extents.X = conn.XEnd + conn.XEnd;

                        m_log.DebugFormat("Scene: {0} to the west of Scene{1} Offset: {2}. Extents:{3}",
                                          conn.RegionScene.RegionInfo.RegionName,
                                          regionConnections.RegionScene.RegionInfo.RegionName, offset, extents);

                        scene.PhysicsScene.Combine(conn.RegionScene.PhysicsScene, offset, extents);

                        connectedYN = true;
                        break;
                    }

                    // If we're one region over -x -y
                    //yxx
                    //xxx
                    //xxx
                    if ((((int)conn.X * (int)Constants.RegionSize) - conn.XEnd
                        == (regionConnections.X * (int)Constants.RegionSize))
                        && (((int)conn.Y * (int)Constants.RegionSize) + conn.YEnd
                        == (regionConnections.Y * (int)Constants.RegionSize)))
                    {
                        Vector3 offset = Vector3.Zero;
                        offset.X = (((regionConnections.X * (int)Constants.RegionSize)) -
                                    ((conn.X * (int)Constants.RegionSize)));
                        offset.Y = (((regionConnections.Y * (int)Constants.RegionSize)) -
                                    ((conn.Y * (int)Constants.RegionSize)));

                        Vector3 extents = Vector3.Zero;
                        extents.Y = regionConnections.YEnd + conn.YEnd;
                        extents.X = conn.XEnd + conn.XEnd;

                        m_log.DebugFormat("Scene: {0} to the northeast of Scene{1} Offset: {2}. Extents:{3}",
                                          conn.RegionScene.RegionInfo.RegionName,
                                          regionConnections.RegionScene.RegionInfo.RegionName, offset, extents);

                        scene.PhysicsScene.Combine(conn.RegionScene.PhysicsScene, offset, extents);

                        connectedYN = true;
                        break;
                    }

                    // If we're one region over x -y
                    //xyx
                    //xxx
                    //xxx
                    if ((((int)conn.X * (int)Constants.RegionSize)
                        == (regionConnections.X * (int)Constants.RegionSize))
                        && (((int)conn.Y * (int)Constants.RegionSize) + conn.YEnd
                        == (regionConnections.Y * (int)Constants.RegionSize)))
                    {
                        Vector3 offset = Vector3.Zero;
                        offset.X = (((regionConnections.X * (int)Constants.RegionSize)) -
                                    ((conn.X * (int)Constants.RegionSize)));
                        offset.Y = (((regionConnections.Y * (int)Constants.RegionSize)) -
                                    ((conn.Y * (int)Constants.RegionSize)));

                        Vector3 extents = Vector3.Zero;
                        extents.Y = regionConnections.YEnd + conn.YEnd;
                        extents.X = conn.XEnd;


                        m_log.DebugFormat("Scene: {0} to the northeast of Scene{1} Offset: {2}. Extents:{3}",
                                         conn.RegionScene.RegionInfo.RegionName,
                                         regionConnections.RegionScene.RegionInfo.RegionName, offset, extents);
                        conn.RegionScene.PhysicsScene.Combine(scene.PhysicsScene,Vector3.Zero,extents);
                        scene.PhysicsScene.Combine(conn.RegionScene.PhysicsScene, offset, Vector3.Zero);

                        conn.RegionScene.NorthBorders[0].BorderLine.Z += (int)Constants.RegionSize;
                        conn.RegionScene.EastBorders[0].BorderLine.Y += (int)Constants.RegionSize;
                        conn.RegionScene.WestBorders[0].BorderLine.Y += (int)Constants.RegionSize;

                        scene.SouthBorders[0].BorderLine.Z += (int)Constants.RegionSize; //auto teleport south

                        // Reset Terrain..  since terrain normally loads first.
                        conn.RegionScene.PhysicsScene.SetTerrain(conn.RegionScene.Heightmap.GetFloatsSerialised());
                        scene.PhysicsScene.SetTerrain(scene.Heightmap.GetFloatsSerialised());

                        connectedYN = true;
                        break;
                    }

                    // If we're one region over +x -y
                    //xxy
                    //xxx
                    //xxx
                    if ((((int)conn.X * (int)Constants.RegionSize) + conn.YEnd
                        == (regionConnections.X * (int)Constants.RegionSize))
                        && (((int)conn.Y * (int)Constants.RegionSize) + conn.YEnd
                        == (regionConnections.Y * (int)Constants.RegionSize)))
                    {
                        Vector3 offset = Vector3.Zero;
                        offset.X = (((regionConnections.X * (int)Constants.RegionSize)) -
                                    ((conn.X * (int)Constants.RegionSize)));
                        offset.Y = (((regionConnections.Y * (int)Constants.RegionSize)) -
                                    ((conn.Y * (int)Constants.RegionSize)));

                        Vector3 extents = Vector3.Zero;
                        extents.Y = regionConnections.YEnd + conn.YEnd;
                        extents.X = conn.XEnd + conn.XEnd;

                        m_log.DebugFormat("Scene: {0} to the south of Scene{1} Offset: {2}. Extents:{3}",
                                        conn.RegionScene.RegionInfo.RegionName,
                                        regionConnections.RegionScene.RegionInfo.RegionName, offset, extents);

                        scene.PhysicsScene.Combine(conn.RegionScene.PhysicsScene, offset,extents);

                        break;
                    }


                }
                if (!connectedYN)
                    m_regions.Add(scene.RegionInfo.originRegionID,regionConnections);
            }
        }

        public void RemoveRegion(Scene scene)
        {
            
        }

        public void RegionLoaded(Scene scene)
        {
            
        }

        public void PostInitialise()
        {
            
        }
        public void OnFrame()
        {
            
        }
    }

    public struct RegionConnections
    {
        public UUID RegionId;
        public Scene RegionScene;
        public uint X;
        public uint Y;
        public int XEnd;
        public int YEnd;
        public List<RegionData> ConnectedRegions;

    }

    public struct RegionData
    {
        public UUID RegionId;
        public Scene RegionScene;
        public Vector3 Offset;
    }
}