/*
 * Copyright (c) Contributors, https://github.com/jonc/osboids
 * 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.Timers;
using System.Collections.Generic;
using OpenMetaverse;
using System.IO;
using Nini.Config;
using System.Threading;
using log4net;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
using OpenSim.Framework;
using OpenSim.Framework.Console;



namespace Flocking
{
	public class FlockingModule : INonSharedRegionModule
	{

		private static readonly ILog m_log = LogManager.GetLogger (System.Reflection.MethodBase.GetCurrentMethod ().DeclaringType);

		private Scene m_scene;
		
		private FlockingModel m_model;
		private FlockingView m_view;

		private bool m_enabled = false;
		private bool m_ready = false;
       	
		private uint m_frame = 0;
        private int m_frameUpdateRate = 1;
		
		private int m_chatChannel = 118;
		private string m_boidPrim;
		
		private UUID m_owner;


		#region IRegionModule Members



		public void Initialise (IConfigSource source)
		{
			//check if we are in the ini files
			//if so get some physical constants out of them and pass into the model
			IConfig config = source.Configs["Boids"];
			if (config != null) {
				m_chatChannel = config.GetInt( "chat-channel", 118 );
				m_boidPrim = config.GetString( "boid-prim", "boidPrim" );
				
				// we're in the config - so turn on this module
				m_enabled = true;
			}
		}

		public void AddRegion (Scene scene)
		{
			m_log.Info("ADDING FLOCKING");
			m_scene = scene;
			if (m_enabled) {
				//register commands
				RegisterCommands();
				
				//register handlers
				m_scene.EventManager.OnFrame += FlockUpdate;
				m_scene.EventManager.OnChatFromClient += SimChatSent; //listen for commands sent from the client

				// init module
				m_model = new FlockingModel();
				m_view = new FlockingView (m_scene);
			}
		}

		public void RegionLoaded (Scene scene)
		{
			if (m_enabled) {
                // Generate initial flock values
                m_model.Initialise( 200, 255, 255, 255);
				
				// who is the owner for the flock in this region
				m_owner = m_scene.RegionInfo.EstateSettings.EstateOwner;
				m_view.PostInitialize(m_owner);

                // Mark Module Ready for duty
                m_ready = true;
			}
		}

		public void RemoveRegion (Scene scene)
		{
			if (m_enabled) {
				m_scene.EventManager.OnFrame -= FlockUpdate;
				m_scene.EventManager.OnChatFromClient -= SimChatSent;
			}
		}


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

		public bool IsSharedModule {
			get { return false; }
		}

		#endregion
		
		#region EventHandlers
		
		public void FlockUpdate()
        {
            if (((m_frame++ % m_frameUpdateRate) != 0) || !m_ready || !m_enabled)
            {
                return;
            }
			
			//m_log.InfoFormat("update my boids");
			
			// work out where everyone has moved to
			// and tell the scene to render the new positions
            List<Boid> boids = m_model.UpdateFlockPos();
            m_view.Render(boids);
        }
		
		protected void SimChatSent (Object x, OSChatMessage msg)
		{
			m_log.Info("got msg");
			if (m_scene.ConsoleScene () != m_scene)
				return; // not for us

			m_log.Info("got channel" + msg.Channel);
			if (msg.Channel != m_chatChannel)
				return; // not for us
			
			// try and parse a valid cmd from this msg
			string cmd = msg.Message.ToLower ();
			m_log.Info("got cmd " + cmd);
			
			//stick ui in the args so we know to respond in world
			string[] args = ("<ui> " + cmd).Split (" ".ToCharArray ());
			
			if (cmd.StartsWith ("stop")) {
				HandleStopCmd("flock", args);
			} else if ( cmd.StartsWith( "start" ) ) {
				HandleStartCmd("flock", args);
			} else if ( cmd.StartsWith( "size" ) ) {
				HandleSetSizeCmd("flock", args);
			} else if ( cmd.StartsWith ( "stats" ) ) {
				HandleShowStatsCmd("flock", args );
			} else if ( cmd.StartsWith ( "prim" ) ) {
				HandleSetPrimCmd("flock", args);
			}
			
		}

		#endregion
		
		#region Command Handling
		
		private void AddCommand (string cmd, string args, string help, CommandDelegate fn)
		{
			string argStr = "";
			if( args.Trim().Length > 0 ) {
				argStr = " <" + args + "> ";
			}
			m_scene.AddCommand (this, "flock-" + cmd, "flock-" + cmd + argStr, help, fn);
		}


		private void RegisterCommands() {
			AddCommand ("stop", "", "Stop all Flocking", HandleStopCmd);
			AddCommand ("start", "", "Start Flocking", HandleStartCmd);
			AddCommand ("size", "num", "Adjust the size of the flock ", HandleSetSizeCmd);
			AddCommand ("stats", "", "show flocking stats", HandleShowStatsCmd);
			AddCommand ("prim", "name", "set the prim used for each boid to that passed in", HandleSetPrimCmd);
		}
		
		private bool ShouldHandleCmd() {
			return m_scene.ConsoleScene () == m_scene;
		}
		
		private bool IsInWorldCmd( ref string [] args ) {
			bool retVal = false;
			
			if( args.Length > 0 && args[0].Equals("<ui>") ) {
				retVal = true;	
			}
			return retVal;
		}
		
		private void ShowResponse(string response, bool inWorld) {
				if( inWorld ){
					IClientAPI ownerAPI = null;
					if( m_scene.TryGetClient( m_owner, out ownerAPI ) ) {
					ownerAPI.SendBlueBoxMessage( m_owner,"osboids", response );
				}
				} else {
					MainConsole.Instance.Output (response);
				}
		}
		
		public void HandleStopCmd (string module, string[] args)
		{
			if( ShouldHandleCmd() ) {
				m_log.Info("stop the flocking capability");
				m_enabled = false;
				m_view.Clear();
			}
		}

		public void HandleStartCmd (string module, string[] args)
		{
			if( ShouldHandleCmd() ) {
				m_log.Info("start the flocking capability");
				m_enabled = true;
				FlockUpdate();
			}
		}

		public void HandleSetSizeCmd (string module, string[] args)
		{
			if( ShouldHandleCmd() ) {
				m_log.Info("set size not implemented yet");
			}
		}
		
		public void HandleShowStatsCmd (string module, string[] args)
		{
			if( ShouldHandleCmd() ) {
				bool inWorld = IsInWorldCmd( ref args );
				ShowResponse("Num Boids = " + m_model.Size, inWorld );
			}
		}
				
		
		public void HandleSetPrimCmd (string module, string[] args)
		{
			if( ShouldHandleCmd() ) {
				m_log.Info("set prim not implemented yet");
			}
		}
		#endregion



		#region IRegionModuleBase Members



		public void Close ()
		{
		}



		public Type ReplaceableInterface {
			get { return null; }
		}
		
		#endregion
	}
	
}