/*
* Copyright (c) Contributors, http://www.openmetaverse.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 libsecondlife;
using OpenSim.Assets;
using OpenSim.Framework;
using OpenSim.Framework.Communications;
using OpenSim.Framework.Console;
using OpenSim.Framework.Data;
using OpenSim.Framework.Interfaces;
using OpenSim.Framework.Servers;
using OpenSim.Framework.Types;
using OpenSim.GenericConfig;
using OpenSim.Physics.Manager;
using OpenSim.Region.Caches;
using OpenSim.Region.ClientStack;
using OpenSim.Region.Communications.Local;
using OpenSim.Region.Communications.OGS1;
using OpenSim.Region.Environment.Scenes;
using OpenSim.Region.Environment;
using System.Text;

namespace OpenSim
{

    public class OpenSimMain : RegionApplicationBase, conscmd_callback
    {
        public string m_physicsEngine;
        protected IGenericConfig localConfig;
        public bool m_sandbox = false;
        public bool m_loginserver;
        public bool user_accounts = false;
        public bool gridLocalAsset = false;
        protected bool configFileSetup = false;
        public string m_config;

        protected CommunicationsManager commsManager;
        // private CheckSumServer checkServer;

        private bool m_silent;
        private string m_logFilename = "region-console-" + Guid.NewGuid().ToString() + ".log";

        public OpenSimMain(bool sandBoxMode, bool startLoginServer, string physicsEngine, bool useConfigFile, bool silent, string configFile)
        :base( )
        {
            this.configFileSetup = useConfigFile;
            m_sandbox = sandBoxMode;
            m_loginserver = startLoginServer;
            m_physicsEngine = physicsEngine;
            m_config = configFile;
            m_silent = silent;
        }

        /// <summary>
        /// Performs initialisation of the world, such as loading configuration from disk.
        /// </summary>
        public void StartUp()
        {
            this.m_serversData = new NetworkServersInfo();

            this.localConfig = new XmlConfig(m_config);
            this.localConfig.LoadData();

            if (this.configFileSetup)
            {
                this.SetupFromConfigFile(this.localConfig);
            }

            m_log = new LogBase(m_logFilename, "Region", this, m_silent);
            MainLog.Instance = m_log;

            m_log.Verbose("Main.cs:Startup() - Loading configuration");
            this.m_serversData.InitConfig(this.m_sandbox, this.localConfig);
            this.localConfig.Close();//for now we can close it as no other classes read from it , but this should change

            ScenePresence.LoadTextureFile("avatar-texture.dat");

            ClientView.TerrainManager = new TerrainManager(new SecondLife());

            this.SetupHttpListener();

            if (m_sandbox)
            {
                this.SetupLocalGridServers();
                //  this.checkServer = new CheckSumServer(12036);
                // this.checkServer.ServerListener();
            }
            else
            {
                this.SetupRemoteGridServers();
            }

            m_startuptime = DateTime.Now;

            this.SetupScene();

            m_log.Verbose("Main.cs:Startup() - Initialising HTTP server");

            //Start http server
            m_log.Verbose("Main.cs:Startup() - Starting HTTP server");
            m_httpServer.Start();

            // Start UDP servers
            for (int i = 0; i < m_udpServer.Count; i++)
            {
                this.m_udpServer[i].ServerListener();
            }

        }

        # region Setup methods
        protected void SetupLocalGridServers()
        {
            try
            {
                m_assetCache = new AssetCache("OpenSim.Region.GridInterfaces.Local.dll", this.m_serversData.AssetURL, this.m_serversData.AssetSendKey);
                m_inventoryCache = new InventoryCache();
                this.commsManager = new CommunicationsLocal(this.m_serversData, m_httpServer);
            }
            catch (Exception e)
            {
                m_log.Error(e.Message + "\nSorry, could not setup local cache");
                Environment.Exit(1);
            }

        }

        protected void SetupRemoteGridServers()
        {
            try
            {
                m_assetCache = new AssetCache("OpenSim.Region.GridInterfaces.Local.dll", this.m_serversData.AssetURL, this.m_serversData.AssetSendKey);
                m_inventoryCache = new InventoryCache();
                this.commsManager = new CommunicationsOGS1(this.m_serversData, m_httpServer);
            }
            catch (Exception e)
            {
                m_log.Error(e.Message + "\nSorry, could not setup remote cache");
                Environment.Exit(1);
            }
        }

        protected void SetupScene()
        {
            IGenericConfig regionConfig;
            Scene scene;
            UDPServer udpServer;
            RegionInfo regionDat = new RegionInfo();
            AuthenticateSessionsBase authenBase;

            string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Regions");
            string[] configFiles = Directory.GetFiles(path, "*.xml");

            if (configFiles.Length == 0)
            {
                string path2 = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Regions");
                string path3 = Path.Combine(path2, "default.xml");
                Console.WriteLine("Creating default region config file");
                //TODO create default region
                IGenericConfig defaultConfig = new XmlConfig(path3);
                defaultConfig.LoadData();
                defaultConfig.Commit();
                defaultConfig.Close();
                defaultConfig = null;
                configFiles = Directory.GetFiles(path, "*.xml");
            }

            for (int i = 0; i < configFiles.Length; i++)
            {
                regionDat = new RegionInfo();
                if (m_sandbox)
                {
                    AuthenticateSessionsBase authen = new AuthenticateSessionsBase();  // new AuthenticateSessionsLocal();
                    this.AuthenticateSessionsHandler.Add(authen);
                    authenBase = authen;
                }
                else
                {
                    AuthenticateSessionsBase authen = new AuthenticateSessionsBase(); //new AuthenticateSessionsRemote();
                    this.AuthenticateSessionsHandler.Add(authen);
                    authenBase = authen;
                }
                Console.WriteLine("Loading region config file");
                regionConfig = new XmlConfig(configFiles[i]);
                regionConfig.LoadData();
                regionDat.InitConfig(this.m_sandbox, regionConfig);
                regionConfig.Close();

                udpServer = new UDPServer(regionDat.InternalEndPoint.Port, m_assetCache, this.m_inventoryCache, this.m_log, authenBase);

                m_udpServer.Add(udpServer);
                this.m_regionData.Add(regionDat);

                StorageManager tmpStoreManager = new StorageManager("OpenSim.DataStore.NullStorage.dll", regionDat.DataStore, regionDat.RegionName);

                scene = new Scene( regionDat, authenBase, commsManager, m_assetCache, tmpStoreManager, m_httpServer);
                this.m_localWorld.Add(scene);

                udpServer.LocalWorld = scene;

                scene.LoadStorageDLL("OpenSim.Region.Storage.LocalStorageDb4o.dll"); //all these dll names shouldn't be hard coded.
                scene.LoadWorldMap();

                PhysicsScene physicsScene = GetPhysicsScene( m_physicsEngine );

                scene.PhysScene = physicsScene;
                scene.PhysScene.SetTerrain(scene.Terrain.getHeights1D());
                scene.LoadPrimsFromStorage();

                //Master Avatar Setup
                UserProfileData masterAvatar = commsManager.UserServer.SetupMasterUser(scene.RegionInfo.MasterAvatarFirstName, scene.RegionInfo.MasterAvatarLastName, scene.RegionInfo.MasterAvatarSandboxPassword);
                if (masterAvatar != null)
                {
                    m_log.Notice("Parcels - Found master avatar [" + masterAvatar.UUID.ToStringHyphenated() + "]");
                    scene.RegionInfo.MasterAvatarAssignedUUID = masterAvatar.UUID;
                    scene.localStorage.LoadParcels((ILocalStorageParcelReceiver)scene.ParcelManager);
                }
                else
                {
                    m_log.Notice("Parcels - No master avatar found, using null.");
                    scene.RegionInfo.MasterAvatarAssignedUUID = libsecondlife.LLUUID.Zero;
                    scene.localStorage.LoadParcels((ILocalStorageParcelReceiver)scene.ParcelManager);
                }
                scene.performParcelPrimCountUpdate();
                scene.StartTimer();
            }
        }

        private static PhysicsScene GetPhysicsScene(string physicsEngine)
        {
            PhysicsPluginManager physicsPluginManager;
            physicsPluginManager = new PhysicsPluginManager();
            physicsPluginManager.LoadPlugins();
            return physicsPluginManager.GetPhysicsScene( physicsEngine );
        }

        private class SimStatusHandler : IStreamHandler
        {
            public byte[] Handle(string path, Stream request)
            {
                return Encoding.UTF8.GetBytes("OK");
            }

            public string ContentType
            {
                get { return "text/plain"; }
            }

            public string HttpMethod
            {
                get { return "GET"; }
            }
            
            public string Path
            {
                get { return "/simstatus/"; }
            }
        }

        protected void SetupHttpListener()
        {
            m_httpServer = new BaseHttpServer(this.m_serversData.HttpListenerPort); //regionData[0].IPListenPort);

            if (!this.m_sandbox)
            {
                m_httpServer.AddStreamHandler( new SimStatusHandler() );
            }
        }

        protected void ConnectToRemoteGridServer()
        {

        }

        #endregion

        private void SetupFromConfigFile(IGenericConfig configData)
        {
            // Log filename
            string attri = "";
            attri = configData.GetAttribute("LogFilename");
            if (String.IsNullOrEmpty(attri))
            {
            }
            else
            {
                m_logFilename = attri;
            }

            // SandBoxMode
            attri = "";
            attri = configData.GetAttribute("SandBox");
            if ((attri == "") || ((attri != "false") && (attri != "true")))
            {
                this.m_sandbox = false;
                configData.SetAttribute("SandBox", "false");
            }
            else
            {
                this.m_sandbox = Convert.ToBoolean(attri);
            }

            // LoginServer
            attri = "";
            attri = configData.GetAttribute("LoginServer");
            if ((attri == "") || ((attri != "false") && (attri != "true")))
            {
                this.m_loginserver = false;
                configData.SetAttribute("LoginServer", "false");
            }
            else
            {
                this.m_loginserver = Convert.ToBoolean(attri);
            }

            // Sandbox User accounts
            attri = "";
            attri = configData.GetAttribute("UserAccount");
            if ((attri == "") || ((attri != "false") && (attri != "true")))
            {
                this.user_accounts = false;
                configData.SetAttribute("UserAccounts", "false");
            }
            else if (attri == "true")
            {
                this.user_accounts = Convert.ToBoolean(attri);
            }

            // Grid mode hack to use local asset server
            attri = "";
            attri = configData.GetAttribute("LocalAssets");
            if ((attri == "") || ((attri != "false") && (attri != "true")))
            {
                this.gridLocalAsset = false;
                configData.SetAttribute("LocalAssets", "false");
            }
            else if (attri == "true")
            {
                this.gridLocalAsset = Convert.ToBoolean(attri);
            }

            
            attri = "";
            attri = configData.GetAttribute("PhysicsEngine");
            switch (attri)
            {
                default:
                    m_log.Warn("Main.cs: SetupFromConfig() - Invalid value for PhysicsEngine attribute, terminating");
                    Environment.Exit(1);
                    break;

                case "":
                    this.m_physicsEngine = "basicphysics";
                    configData.SetAttribute("PhysicsEngine", "basicphysics");
                    ScenePresence.PhysicsEngineFlying = false;
                    break;

                case "basicphysics":
                    this.m_physicsEngine = "basicphysics";
                    configData.SetAttribute("PhysicsEngine", "basicphysics");
                    ScenePresence.PhysicsEngineFlying = false;
                    break;

                case "RealPhysX":
                    this.m_physicsEngine = "RealPhysX";
                    ScenePresence.PhysicsEngineFlying = true;
                    break;

                case "OpenDynamicsEngine":
                    this.m_physicsEngine = "OpenDynamicsEngine";
                    ScenePresence.PhysicsEngineFlying = true;
                    break;

                case "BulletXEngine":
                    this.m_physicsEngine = "BulletXEngine";
                    ScenePresence.PhysicsEngineFlying = true;
                    break;
            }

            configData.Commit();

        }

        /// <summary>
        /// Performs any last-minute sanity checking and shuts down the region server
        /// </summary>
        public virtual void Shutdown()
        {
            m_log.Verbose("Main.cs:Shutdown() - Closing all threads");
            m_log.Verbose("Main.cs:Shutdown() - Killing listener thread");
            m_log.Verbose("Main.cs:Shutdown() - Killing clients");
            // IMPLEMENT THIS
            m_log.Verbose("Main.cs:Shutdown() - Closing console and terminating");
            for (int i = 0; i < m_localWorld.Count; i++)
            {
                ((Scene)m_localWorld[i]).Close();
            }
            m_log.Close();
            Environment.Exit(0);
        }

        #region Console Commands
        /// <summary>
        /// Runs commands issued by the server console from the operator
        /// </summary>
        /// <param name="command">The first argument of the parameter (the command)</param>
        /// <param name="cmdparams">Additional arguments passed to the command</param>
        public void RunCmd(string command, string[] cmdparams)
        {
            switch (command)
            {
                case "help":
                    m_log.Error("show users - show info about connected users");
                    m_log.Error("quit - disconnect all clients and shutdown");
                    break;

                case "show":
                    if (cmdparams.Length > 0)
                    {
                        Show(cmdparams[0]);
                    }
                    break;

                case "terrain":
                    string result = "";
                    for (int i = 0; i < m_localWorld.Count; i++)
                    {
                        if (!((Scene)m_localWorld[i]).Terrain.RunTerrainCmd(cmdparams, ref result, m_localWorld[i].RegionInfo.RegionName))
                        {
                            m_log.Error(result);
                        }
                    }
                    break;
                case "script":
                    for (int i = 0; i < m_localWorld.Count; i++)
                    {
                        ((Scene)m_localWorld[i]).SendCommandToScripts(cmdparams);
                    }
                    break;

                case "quit":
                case "shutdown":
                    Shutdown();
                    break;

                default:
                    m_log.Error("Unknown command");
                    break;
            }
        }

        /// <summary>
        /// Outputs to the console information about the region
        /// </summary>
        /// <param name="ShowWhat">What information to display (valid arguments are "uptime", "users")</param>
        public void Show(string ShowWhat)
        {
            switch (ShowWhat)
            {
                case "uptime":
                    m_log.Error("OpenSim has been running since " + m_startuptime.ToString());
                    m_log.Error("That is " + (DateTime.Now - m_startuptime).ToString());
                    break;
                case "users":
                    ScenePresence TempAv;
                    m_log.Error(String.Format("{0,-16}{1,-16}{2,-25}{3,-25}{4,-16}{5,-16}{6,-16}", "Firstname", "Lastname", "Agent ID", "Session ID", "Circuit", "IP", "World"));
                    for (int i = 0; i < m_localWorld.Count; i++)
                    {
                        foreach (libsecondlife.LLUUID UUID in ((Scene)m_localWorld[i]).Entities.Keys)
                        {
                            if (((Scene)m_localWorld[i]).Entities[UUID].ToString() == "OpenSim.world.Avatar")
                            {
                                TempAv = (ScenePresence)((Scene)m_localWorld[i]).Entities[UUID];
                                m_log.Error(String.Format("{0,-16}{1,-16}{2,-25}{3,-25}{4,-16},{5,-16}{6,-16}", TempAv.firstname, TempAv.lastname, UUID, TempAv.ControllingClient.AgentId, "Unknown", "Unknown"), ((Scene)m_localWorld[i]).RegionInfo.RegionName);
                            }
                        }
                    }
                    break;
            }
        }
        #endregion
    }


}