/*
 * 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.Generic;
using System.Reflection;
using log4net;
using Nini.Config;
using OpenMetaverse;
using Mono.Addins;
using OpenSim.Framework;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
using OpenSim.Services.Interfaces;
using GridRegion = OpenSim.Services.Interfaces.GridRegion;

namespace OpenSim.Region.CoreModules.World.WorldMap
{
    [Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule", Id = "MapSearchModule")]
    public class MapSearchModule : ISharedRegionModule
    {
        private static readonly ILog m_log =
            LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        Scene m_scene = null; // only need one for communication with GridService
        List<Scene> m_scenes = new List<Scene>();
        List<UUID> m_Clients;

        #region ISharedRegionModule Members
        public void Initialise(IConfigSource source)
        {
        }

        public void AddRegion(Scene scene)
        {
            if (m_scene == null)
            {
                m_scene = scene;
            }

            m_scenes.Add(scene);
            scene.EventManager.OnNewClient += OnNewClient;
            m_Clients = new List<UUID>();
        }

        public void RemoveRegion(Scene scene)
        {
            m_scenes.Remove(scene);
            if (m_scene == scene && m_scenes.Count > 0)
                m_scene = m_scenes[0];

            scene.EventManager.OnNewClient -= OnNewClient;
        }

        public void PostInitialise()
        {
        }

        public void Close()
        {
            m_scene = null;
            m_scenes.Clear();
        }

        public string Name
        {
            get { return "MapSearchModule"; }
        }

        public Type ReplaceableInterface
        {
            get { return null; }
        }

        public void RegionLoaded(Scene scene)
        {
        }
        #endregion

        private void OnNewClient(IClientAPI client)
        {
            client.OnMapNameRequest += OnMapNameRequestHandler;
        }

        private void OnMapNameRequestHandler(IClientAPI remoteClient, string mapName, uint flags)
        {
            lock (m_Clients)
            {
                if (m_Clients.Contains(remoteClient.AgentId))
                    return;

                m_Clients.Add(remoteClient.AgentId);
            }

            try
            {
                OnMapNameRequest(remoteClient, mapName, flags);
            }
            finally
            {
                lock (m_Clients)
                    m_Clients.Remove(remoteClient.AgentId);
            }
        }

        private void OnMapNameRequest(IClientAPI remoteClient, string mapName, uint flags)
        {
            List<MapBlockData> blocks = new List<MapBlockData>();
            MapBlockData data;
            if (mapName.Length < 3 || (mapName.EndsWith("#") && mapName.Length < 4))
            {
                // final block, closing the search result
                AddFinalBlock(blocks);

                // flags are agent flags sent from the viewer.
                // they have different values depending on different viewers, apparently
                remoteClient.SendMapBlock(blocks, flags);
                remoteClient.SendAlertMessage("Use a search string with at least 3 characters");
                return;
            }


            //m_log.DebugFormat("MAP NAME=({0})", mapName);

            // Hack to get around the fact that ll V3 now drops the port from the
            // map name. See https://jira.secondlife.com/browse/VWR-28570
            //
            // Caller, use this magic form instead:
            // secondlife://http|!!mygrid.com|8002|Region+Name/128/128
            // or url encode if possible.
            // the hacks we do with this viewer...
            //
            string mapNameOrig = mapName;
            if (mapName.Contains("|"))
                mapName = mapName.Replace('|', ':');
            if (mapName.Contains("+"))
                mapName = mapName.Replace('+', ' ');
            if (mapName.Contains("!"))
                mapName = mapName.Replace('!', '/');
            
            // try to fetch from GridServer
            List<GridRegion> regionInfos = m_scene.GridService.GetRegionsByName(m_scene.RegionInfo.ScopeID, mapName, 20);

            m_log.DebugFormat("[MAPSEARCHMODULE]: search {0} returned {1} regions. Flags={2}", mapName, regionInfos.Count, flags);
            if (regionInfos.Count > 0)
            {
                foreach (GridRegion info in regionInfos)
                {
                    data = new MapBlockData();
                    data.Agents = 0;
                    data.Access = info.Access;
                    if (flags == 2) // V2 sends this
                        data.MapImageId = UUID.Zero; 
                    else
                        data.MapImageId = info.TerrainImage;
                    // ugh! V2-3 is very sensitive about the result being
                    // exactly the same as the requested name
                    if (regionInfos.Count == 1 && mapNameOrig.Contains("|") || mapNameOrig.Contains("+"))
                        data.Name = mapNameOrig;
                    else
                        data.Name = info.RegionName;
                    data.RegionFlags = 0; // TODO not used?
                    data.WaterHeight = 0; // not used
                    data.X = (ushort)(info.RegionLocX / Constants.RegionSize);
                    data.Y = (ushort)(info.RegionLocY / Constants.RegionSize);
                    blocks.Add(data);
                }
            }

            // final block, closing the search result
            AddFinalBlock(blocks);

            // flags are agent flags sent from the viewer.
            // they have different values depending on different viewers, apparently
            remoteClient.SendMapBlock(blocks, flags);

            // send extra user messages for V3
            // because the UI is very confusing
            // while we don't fix the hard-coded urls
            if (flags == 2) 
            {
                if (regionInfos.Count == 0)
                    remoteClient.SendAlertMessage("No regions found with that name.");
                else if (regionInfos.Count == 1)
                    remoteClient.SendAlertMessage("Region found!");
            }
        }

        private void AddFinalBlock(List<MapBlockData> blocks)
        {
                // final block, closing the search result
                MapBlockData data = new MapBlockData();
                data.Agents = 0;
                data.Access = 255;
                data.MapImageId = UUID.Zero;
                data.Name = "";
                data.RegionFlags = 0;
                data.WaterHeight = 0; // not used
                data.X = 0;
                data.Y = 0;
                blocks.Add(data);
        }
//        private Scene GetClientScene(IClientAPI client)
//        {
//            foreach (Scene s in m_scenes)
//            {
//                if (client.Scene.RegionInfo.RegionHandle == s.RegionInfo.RegionHandle)
//                    return s;
//            }
//            return m_scene;
//        }
    }
}
