/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*       derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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*/

using System;
using System.Collections.Generic;
using libsecondlife;
using Nini.Config;
using OpenSim.Framework;
using OpenSim.Framework.Console;
using OpenSim.Region.Environment.Interfaces;
using OpenSim.Region.Environment.Scenes;

namespace OpenSim.Region.Environment.Modules
{
    /// <summary>
    /// Version 2.0 - Very hacky compared to the original. Will fix original and release as 0.3 later.
    /// </summary>
    public class TreePopulatorModule : IRegionModule
    {
        private Scene m_scene;
        private static readonly log4net.ILog m_log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        private List<LLUUID> m_trees;

        public double m_tree_density = 50.0; // Aim for this many per region
        public double m_tree_updates = 1000.0; // MS between updates

        public void Initialise(Scene scene, IConfigSource config)
        {
            try
            {
                m_tree_density = config.Configs["Trees"].GetDouble("tree_density", m_tree_density);
            }
            catch (Exception)
            { }

            m_trees = new List<LLUUID>();
            m_scene = scene;

            m_scene.EventManager.OnPluginConsole += new EventManager.OnPluginConsoleDelegate(EventManager_OnPluginConsole);

            System.Timers.Timer CalculateTrees = new System.Timers.Timer(m_tree_updates);
            CalculateTrees.Elapsed += new System.Timers.ElapsedEventHandler(CalculateTrees_Elapsed);
            CalculateTrees.Start();
            m_log.Debug("[TREES]: Initialised tree module");
        }

        void EventManager_OnPluginConsole(string[] args)
        {
            if (args[0] == "tree")
            {
                m_log.Debug("[TREES]: New tree planting");
                CreateTree(new LLVector3(128.0f, 128.0f, 0.0f));
            }
        }

        void growTrees()
        {
            foreach (LLUUID tree in m_trees)
            {
                if (m_scene.Entities.ContainsKey(tree))
                {
                    SceneObjectPart s_tree = ((SceneObjectGroup)m_scene.Entities[tree]).RootPart;

                    // 100 seconds to grow 1m
                    s_tree.Scale += new LLVector3(0.1f, 0.1f, 0.1f);
                    s_tree.SendFullUpdateToAllClients();
                    //s_tree.ScheduleTerseUpdate();
                }
                else
                {
                    m_trees.Remove(tree);
                }
            }
        }

        void seedTrees()
        {
            foreach (LLUUID tree in m_trees)
            {
                if (m_scene.Entities.ContainsKey(tree))
                {
                    SceneObjectPart s_tree = ((SceneObjectGroup)m_scene.Entities[tree]).RootPart;

                    if (s_tree.Scale.X > 0.5)
                    {
                        if (Util.RandomClass.NextDouble() > 0.75)
                        {
                            SpawnChild(s_tree);
                        }
                    }
                    
                }
                else
                {
                    m_trees.Remove(tree);
                }
            }
        }

        void killTrees()
        {
            foreach (LLUUID tree in m_trees)
            {
                double killLikelyhood = 0.0;

                if (m_scene.Entities.ContainsKey(tree))
                {
                    SceneObjectPart selectedTree = ((SceneObjectGroup)m_scene.Entities[tree]).RootPart;
                    double selectedTreeScale = Math.Sqrt(Math.Pow(selectedTree.Scale.X, 2) +
                                                         Math.Pow(selectedTree.Scale.Y, 2) +
                                                         Math.Pow(selectedTree.Scale.Z, 2));

                    foreach (LLUUID picktree in m_trees)
                    {
                        if (picktree != tree)
                        {
                            SceneObjectPart pickedTree = ((SceneObjectGroup)m_scene.Entities[picktree]).RootPart;

                            double pickedTreeScale = Math.Sqrt(Math.Pow(pickedTree.Scale.X, 2) +
                                                               Math.Pow(pickedTree.Scale.Y, 2) +
                                                               Math.Pow(pickedTree.Scale.Z, 2));

                            double pickedTreeDistance = Math.Sqrt(Math.Pow(Math.Abs(pickedTree.AbsolutePosition.X - selectedTree.AbsolutePosition.X), 2) +
                                                                  Math.Pow(Math.Abs(pickedTree.AbsolutePosition.Y - selectedTree.AbsolutePosition.Y), 2) +
                                                                  Math.Pow(Math.Abs(pickedTree.AbsolutePosition.Z - selectedTree.AbsolutePosition.Z), 2));

                            killLikelyhood += (selectedTreeScale / (pickedTreeScale * pickedTreeDistance)) * 0.1;
                        }
                    }

                    if (Util.RandomClass.NextDouble() < killLikelyhood)
                    {
                        m_scene.RemoveEntity(selectedTree.ParentGroup);
                        m_trees.Remove(selectedTree.ParentGroup.UUID);

                        m_scene.ForEachClient(delegate(IClientAPI controller)
                                {
                                    controller.SendKillObject(m_scene.RegionInfo.RegionHandle,
                                        selectedTree.LocalID);
                                });

                        break;
                    }
                    else
                    {
                        selectedTree.SetText(killLikelyhood.ToString(), new Axiom.Math.Vector3(1.0f, 1.0f, 1.0f), 1.0);
                    }
                }
                else
                {
                    m_trees.Remove(tree);
                }
            }
        }

        private void SpawnChild(SceneObjectPart s_tree)
        {
            LLVector3 position = new LLVector3();

            position.X = s_tree.AbsolutePosition.X + (1 * (-1 * Util.RandomClass.Next(1)));
            if (position.X > 255)
                position.X = 255;
            if (position.X < 0)
                position.X = 0;
            position.Y = s_tree.AbsolutePosition.Y + (1 * (-1 * Util.RandomClass.Next(1)));
            if (position.Y > 255)
                position.Y = 255;
            if (position.Y < 0)
                position.Y = 0;

            double randX = ((Util.RandomClass.NextDouble() * 2.0) - 1.0) * (s_tree.Scale.X * 3);
            double randY = ((Util.RandomClass.NextDouble() * 2.0) - 1.0) * (s_tree.Scale.X * 3);

            position.X += (float)randX;
            position.Y += (float)randY;

            CreateTree(position);
        }

        private void CreateTree(LLVector3 position)
        {
            position.Z = (float)m_scene.Terrain.heightmap.Get((int)position.X, (int)position.Y);

            SceneObjectGroup tree =
                m_scene.AddTree(new LLVector3(0.1f, 0.1f, 0.1f),
                                LLQuaternion.Identity,
                                position,
                                Tree.Cypress1,
                                false);

            m_trees.Add(tree.UUID);
            tree.SendGroupFullUpdate();
        }

        void CalculateTrees_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            growTrees();
            seedTrees();
            killTrees();
        }

        public void PostInitialise()
        {
        }

        public void Close()
        {
        }

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

        public bool IsSharedModule
        {
            get { return false; }
        }
    }
}