/*
 * 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 System.Timers;
using OpenMetaverse;
using log4net;
using Mono.Addins;
using Nini.Config;
using OpenSim.Framework;
using OpenSim.Region.CoreModules.Framework.InterfaceCommander;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;

using System.Xml;
using System.Xml.Serialization;
using System.IO;

namespace OpenSim.Region.OptionalModules.World.TreePopulator
{
    /// <summary>
    /// Version 2.02 - Still hacky
    /// </summary>
    [Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule", Id = "TreePopulatorModule")]
    public class TreePopulatorModule : INonSharedRegionModule, ICommandableModule, IVegetationModule
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        private readonly Commander m_commander = new Commander("tree");
        private Scene m_scene;

        [XmlRootAttribute(ElementName = "Copse", IsNullable = false)]
        public class Copse
        {
            public string m_name;
            public Boolean m_frozen;
            public Tree m_tree_type;
            public int m_tree_quantity;
            public float m_treeline_low;
            public float m_treeline_high;
            public Vector3 m_seed_point;
            public double m_range;
            public Vector3 m_initial_scale;
            public Vector3 m_maximum_scale;
            public Vector3 m_rate;

            [XmlIgnore]
            public Boolean m_planted;
            [XmlIgnore]
            public List<UUID> m_trees;

            public Copse()
            {
            }

            public Copse(string fileName, Boolean planted)
            {
                Copse cp = (Copse)DeserializeObject(fileName);

                this.m_name = cp.m_name;
                this.m_frozen = cp.m_frozen;
                this.m_tree_quantity = cp.m_tree_quantity;
                this.m_treeline_high = cp.m_treeline_high;
                this.m_treeline_low = cp.m_treeline_low;
                this.m_range = cp.m_range;
                this.m_tree_type = cp.m_tree_type;
                this.m_seed_point = cp.m_seed_point;
                this.m_initial_scale = cp.m_initial_scale;
                this.m_maximum_scale = cp.m_maximum_scale;
                this.m_initial_scale = cp.m_initial_scale;
                this.m_rate = cp.m_rate;
                this.m_planted = planted;
                this.m_trees = new List<UUID>();
            }

            public Copse(string copsedef)
            {
                char[] delimiterChars = {':', ';'};
                string[] field = copsedef.Split(delimiterChars);

                this.m_name = field[1].Trim();
                this.m_frozen = (copsedef[0] == 'F');
                this.m_tree_quantity = int.Parse(field[2]);
                this.m_treeline_high = float.Parse(field[3], Culture.NumberFormatInfo);
                this.m_treeline_low = float.Parse(field[4], Culture.NumberFormatInfo);
                this.m_range = double.Parse(field[5], Culture.NumberFormatInfo);
                this.m_tree_type = (Tree) Enum.Parse(typeof(Tree),field[6]);
                this.m_seed_point = Vector3.Parse(field[7]);
                this.m_initial_scale = Vector3.Parse(field[8]);
                this.m_maximum_scale = Vector3.Parse(field[9]);
                this.m_rate = Vector3.Parse(field[10]);
                this.m_planted = true;
                this.m_trees = new List<UUID>();
            }

            public Copse(string name, int quantity, float high, float low, double range, Vector3 point, Tree type, Vector3 scale, Vector3 max_scale, Vector3 rate, List<UUID> trees)
            {
                this.m_name = name;
                this.m_frozen = false;
                this.m_tree_quantity = quantity;
                this.m_treeline_high = high;
                this.m_treeline_low = low;
                this.m_range = range;
                this.m_tree_type = type;
                this.m_seed_point = point;
                this.m_initial_scale = scale;
                this.m_maximum_scale = max_scale;
                this.m_rate = rate;
                this.m_planted = false;
                this.m_trees = trees;
            }

            public override string ToString()
            {
                string frozen = (this.m_frozen ? "F" : "A");

                return string.Format("{0}TPM: {1}; {2}; {3:0.0}; {4:0.0}; {5:0.0}; {6}; {7:0.0}; {8:0.0}; {9:0.0}; {10:0.00};",
                    frozen,
                    this.m_name,
                    this.m_tree_quantity,
                    this.m_treeline_high,
                    this.m_treeline_low,
                    this.m_range,
                    this.m_tree_type,
                    this.m_seed_point.ToString(),
                    this.m_initial_scale.ToString(),
                    this.m_maximum_scale.ToString(),
                    this.m_rate.ToString());
            }
        }

        private List<Copse> m_copse;

        private double m_update_ms = 1000.0; // msec between updates
        private bool m_active_trees = false;

        Timer CalculateTrees;

        #region ICommandableModule Members

        public ICommander CommandInterface
        {
            get { return m_commander; }
        }

        #endregion

        #region Region Module interface

        public void Initialise(IConfigSource config)
        {

            // ini file settings
            try
            {
                m_active_trees = config.Configs["Trees"].GetBoolean("active_trees", m_active_trees);
            }
            catch (Exception)
            {
                m_log.Debug("[TREES]: ini failure for active_trees - using default");
            }

            try
            {
                m_update_ms = config.Configs["Trees"].GetDouble("update_rate", m_update_ms);
            }
            catch (Exception)
            {
                m_log.Debug("[TREES]: ini failure for update_rate - using default");
            }

            InstallCommands();

            m_log.Debug("[TREES]: Initialised tree module");
        }

        public void AddRegion(Scene scene)
        {
            m_scene = scene;
            m_scene.RegisterModuleCommander(m_commander);
            m_scene.EventManager.OnPluginConsole += EventManager_OnPluginConsole;

        }

        public void RemoveRegion(Scene scene)
        {
        }

        public void RegionLoaded(Scene scene)
        {
            ReloadCopse();
            if (m_copse.Count > 0)
                m_log.Info("[TREES]: Copse load complete");

            if (m_active_trees)
                activeizeTreeze(true);
        }

        public void Close()
        {
        }

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

        public Type ReplaceableInterface
        {
            get { return null; }
        }


        #endregion

        //--------------------------------------------------------------

        #region ICommandableModule Members

        private void HandleTreeActive(Object[] args)
        {
            if ((Boolean)args[0] && !m_active_trees)
            {
                m_log.InfoFormat("[TREES]: Activating Trees");
                m_active_trees = true;
                activeizeTreeze(m_active_trees);
            }
            else if (!(Boolean)args[0] && m_active_trees)
            {
                m_log.InfoFormat("[TREES]: Trees module is no longer active");
                m_active_trees = false;
                activeizeTreeze(m_active_trees);
            }
            else
            {
                m_log.InfoFormat("[TREES]: Trees module is already in the required state");
            }
        }

        private void HandleTreeFreeze(Object[] args)
        {
            string copsename = ((string)args[0]).Trim();
            Boolean freezeState = (Boolean) args[1];

            foreach (Copse cp in m_copse)
            {
                if (cp.m_name == copsename && (!cp.m_frozen && freezeState || cp.m_frozen && !freezeState))
                {
                    cp.m_frozen = freezeState;
                    foreach (UUID tree in cp.m_trees)
                    {
                        SceneObjectPart sop = ((SceneObjectGroup)m_scene.Entities[tree]).RootPart;
                        sop.Name = (freezeState ? sop.Name.Replace("ATPM", "FTPM") : sop.Name.Replace("FTPM", "ATPM"));
                        sop.ParentGroup.HasGroupChanged = true;
                    }

                    m_log.InfoFormat("[TREES]: Activity for copse {0} is frozen {1}", copsename, freezeState);
                    return;
                }
                else if (cp.m_name == copsename && (cp.m_frozen && freezeState || !cp.m_frozen && !freezeState))
                {
                    m_log.InfoFormat("[TREES]: Copse {0} is already in the requested freeze state", copsename);
                    return;
                }
            }
            m_log.InfoFormat("[TREES]: Copse {0} was not found - command failed", copsename);
        }

        private void HandleTreeLoad(Object[] args)
        {
            Copse copse;

            m_log.InfoFormat("[TREES]: Loading copse definition....");

            copse = new Copse(((string)args[0]), false);
            foreach (Copse cp in m_copse)
            {
                if (cp.m_name == copse.m_name)
                {
                    m_log.InfoFormat("[TREES]: Copse: {0} is already defined - command failed", copse.m_name);
                    return;
                }
            }

            m_copse.Add(copse);
            m_log.InfoFormat("[TREES]: Loaded copse: {0}", copse.ToString());
        }

        private void HandleTreePlant(Object[] args)
        {
            string copsename = ((string)args[0]).Trim();

            m_log.InfoFormat("[TREES]: New tree planting for copse {0}", copsename);
            UUID uuid = m_scene.RegionInfo.EstateSettings.EstateOwner;

            foreach (Copse copse in m_copse)
            {
                if (copse.m_name == copsename)
                {
                    if (!copse.m_planted)
                    {
                        // The first tree for a copse is created here
                        CreateTree(uuid, copse, copse.m_seed_point);
                        copse.m_planted = true;
                        return;
                    }
                    else
                    {
                        m_log.InfoFormat("[TREES]: Copse {0} has already been planted", copsename);
                    }
                }
            }
            m_log.InfoFormat("[TREES]: Copse {0} not found for planting", copsename);
        }

        private void HandleTreeRate(Object[] args)
        {
            m_update_ms = (double)args[0];
            if (m_update_ms >= 1000.0)
            {
                if (m_active_trees)
                {
                    activeizeTreeze(false);
                    activeizeTreeze(true);
                }
                m_log.InfoFormat("[TREES]: Update rate set to {0} mSec", m_update_ms);
            }
            else
            {
                m_log.InfoFormat("[TREES]: minimum rate is 1000.0 mSec - command failed");
            }
        }

        private void HandleTreeReload(Object[] args)
        {
            if (m_active_trees)
            {
                CalculateTrees.Stop();
            }

            ReloadCopse();

            if (m_active_trees)
            {
                CalculateTrees.Start();
            }
        }

        private void HandleTreeRemove(Object[] args)
        {
            string copsename = ((string)args[0]).Trim();
            Copse copseIdentity = null;

            foreach (Copse cp in m_copse)
            {
                if (cp.m_name == copsename)
                {
                    copseIdentity = cp;
                }
            }

            if (copseIdentity != null)
            {
                foreach (UUID tree in copseIdentity.m_trees)
                {
                    if (m_scene.Entities.ContainsKey(tree))
                    {
                        SceneObjectPart selectedTree = ((SceneObjectGroup)m_scene.Entities[tree]).RootPart;
                        // Delete tree and alert clients (not silent)
                        m_scene.DeleteSceneObject(selectedTree.ParentGroup, false);
                    }
                    else
                    {
                        m_log.DebugFormat("[TREES]: Tree not in scene {0}", tree);
                    }
                }
                copseIdentity.m_trees = new List<UUID>();
                m_copse.Remove(copseIdentity);
                m_log.InfoFormat("[TREES]: Copse {0} has been removed", copsename);
            }
            else
            {
                m_log.InfoFormat("[TREES]: Copse {0} was not found - command failed", copsename);
            }
        }

        private void HandleTreeStatistics(Object[] args)
        {
            m_log.InfoFormat("[TREES]: Activity State: {0};  Update Rate: {1}", m_active_trees, m_update_ms);
            foreach (Copse cp in m_copse)
            {
                m_log.InfoFormat("[TREES]: Copse {0}; {1} trees; frozen {2}", cp.m_name, cp.m_trees.Count, cp.m_frozen);
            }
        }

        private void InstallCommands()
        {
            Command treeActiveCommand =
                new Command("active", CommandIntentions.COMMAND_HAZARDOUS, HandleTreeActive, "Change activity state for the trees module");
            treeActiveCommand.AddArgument("activeTF", "The required activity state", "Boolean");

            Command treeFreezeCommand =
                new Command("freeze", CommandIntentions.COMMAND_HAZARDOUS, HandleTreeFreeze, "Freeze/Unfreeze activity for a defined copse");
            treeFreezeCommand.AddArgument("copse", "The required copse", "String");
            treeFreezeCommand.AddArgument("freezeTF", "The required freeze state", "Boolean");

            Command treeLoadCommand =
                new Command("load", CommandIntentions.COMMAND_HAZARDOUS, HandleTreeLoad, "Load a copse definition from an xml file");
            treeLoadCommand.AddArgument("filename", "The (xml) file you wish to load", "String");

            Command treePlantCommand =
                new Command("plant", CommandIntentions.COMMAND_HAZARDOUS, HandleTreePlant, "Start the planting on a copse");
            treePlantCommand.AddArgument("copse", "The required copse", "String");

            Command treeRateCommand =
                new Command("rate", CommandIntentions.COMMAND_HAZARDOUS, HandleTreeRate, "Reset the tree update rate (mSec)");
            treeRateCommand.AddArgument("updateRate", "The required update rate (minimum 1000.0)", "Double");

            Command treeReloadCommand =
                new Command("reload", CommandIntentions.COMMAND_HAZARDOUS, HandleTreeReload, "Reload copse definitions from the in-scene trees");

            Command treeRemoveCommand =
                new Command("remove", CommandIntentions.COMMAND_HAZARDOUS, HandleTreeRemove, "Remove a copse definition and all its in-scene trees");
            treeRemoveCommand.AddArgument("copse", "The required copse", "String");

            Command treeStatisticsCommand =
                new Command("statistics", CommandIntentions.COMMAND_STATISTICAL, HandleTreeStatistics, "Log statistics about the trees");

            m_commander.RegisterCommand("active", treeActiveCommand);
            m_commander.RegisterCommand("freeze", treeFreezeCommand);
            m_commander.RegisterCommand("load", treeLoadCommand);
            m_commander.RegisterCommand("plant", treePlantCommand);
            m_commander.RegisterCommand("rate", treeRateCommand);
            m_commander.RegisterCommand("reload", treeReloadCommand);
            m_commander.RegisterCommand("remove", treeRemoveCommand);
            m_commander.RegisterCommand("statistics", treeStatisticsCommand);
        }

        /// <summary>
        /// Processes commandline input. Do not call directly.
        /// </summary>
        /// <param name="args">Commandline arguments</param>
        private void EventManager_OnPluginConsole(string[] args)
        {
            if (args[0] == "tree")
            {
                if (args.Length == 1)
                {
                    m_commander.ProcessConsoleCommand("help", new string[0]);
                    return;
                }

                string[] tmpArgs = new string[args.Length - 2];
                int i;
                for (i = 2; i < args.Length; i++)
                {
                    tmpArgs[i - 2] = args[i];
                }

                m_commander.ProcessConsoleCommand(args[1], tmpArgs);
            }
        }
        #endregion

        #region IVegetationModule Members

        public SceneObjectGroup AddTree(
            UUID uuid, UUID groupID, Vector3 scale, Quaternion rotation, Vector3 position, Tree treeType, bool newTree)
        {
            PrimitiveBaseShape treeShape = new PrimitiveBaseShape();
            treeShape.PathCurve = 16;
            treeShape.PathEnd = 49900;
            treeShape.PCode = newTree ? (byte)PCode.NewTree : (byte)PCode.Tree;
            treeShape.Scale = scale;
            treeShape.State = (byte)treeType;

            return m_scene.AddNewPrim(uuid, groupID, position, rotation, treeShape);
        }

        #endregion

        #region IEntityCreator Members

        protected static readonly PCode[] creationCapabilities = new PCode[] { PCode.NewTree, PCode.Tree };
        public PCode[] CreationCapabilities { get { return creationCapabilities; } }

        public SceneObjectGroup CreateEntity(
            UUID ownerID, UUID groupID, Vector3 pos, Quaternion rot, PrimitiveBaseShape shape)
        {
            if (Array.IndexOf(creationCapabilities, (PCode)shape.PCode) < 0)
            {
                m_log.DebugFormat("[VEGETATION]: PCode {0} not handled by {1}", shape.PCode, Name);
                return null;
            }

            SceneObjectGroup sceneObject = new SceneObjectGroup(ownerID, pos, rot, shape);
            SceneObjectPart rootPart = sceneObject.GetPart(sceneObject.UUID);

            rootPart.AddFlag(PrimFlags.Phantom);

            sceneObject.SetGroup(groupID, null);
            m_scene.AddNewSceneObject(sceneObject, true);
            sceneObject.InvalidateEffectivePerms();
            return sceneObject;
        }

        #endregion

        //--------------------------------------------------------------

        #region Tree Utilities
        static public void SerializeObject(string fileName, Object obj)
        {
            try
            {
                XmlSerializer xs = new XmlSerializer(typeof(Copse));

                using (XmlTextWriter writer = new XmlTextWriter(fileName, Util.UTF8))
                {
                    writer.Formatting = Formatting.Indented;
                    xs.Serialize(writer, obj);
                }
            }
            catch (SystemException ex)
            {
                throw new ApplicationException("Unexpected failure in Tree serialization", ex);
            }
        }

        static public object DeserializeObject(string fileName)
        {
            try
            {
                XmlSerializer xs = new XmlSerializer(typeof(Copse));

                using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
                    return xs.Deserialize(fs);
            }
            catch (SystemException ex)
            {
                throw new ApplicationException("Unexpected failure in Tree de-serialization", ex);
            }
        }

        private void ReloadCopse()
        {
            m_copse = new List<Copse>();

            EntityBase[] objs = m_scene.GetEntities();
            foreach (EntityBase obj in objs)
            {
                if (obj is SceneObjectGroup)
                {
                    SceneObjectGroup grp = (SceneObjectGroup)obj;

                    if (grp.Name.Length > 5 && (grp.Name.Substring(0, 5) == "ATPM:" || grp.Name.Substring(0, 5) == "FTPM:"))
                    {
                        // Create a new copse definition or add uuid to an existing definition
                        try
                        {
                            Boolean copsefound = false;
                            Copse copse = new Copse(grp.Name);

                            foreach (Copse cp in m_copse)
                            {
                                if (cp.m_name == copse.m_name)
                                {
                                    copsefound = true;
                                    cp.m_trees.Add(grp.UUID);
                                    //m_log.DebugFormat("[TREES]: Found tree {0}", grp.UUID);
                                }
                            }

                            if (!copsefound)
                            {
                                m_log.InfoFormat("[TREES]: Found copse {0}", grp.Name);
                                m_copse.Add(copse);
                                copse.m_trees.Add(grp.UUID);
                            }
                        }
                        catch
                        {
                            m_log.InfoFormat("[TREES]: Ill formed copse definition {0} - ignoring", grp.Name);
                        }
                    }
                }
            }
        }
        #endregion

        private void activeizeTreeze(bool activeYN)
        {
            if (activeYN)
            {
                CalculateTrees = new Timer(m_update_ms);
                CalculateTrees.Elapsed += CalculateTrees_Elapsed;
                CalculateTrees.Start();
            }
            else
            {
                 CalculateTrees.Stop();
            }
        }

        private void growTrees()
        {
            foreach (Copse copse in m_copse)
            {
                if (!copse.m_frozen)
                {
                    foreach (UUID tree in copse.m_trees)
                    {
                        if (m_scene.Entities.ContainsKey(tree))
                        {
                            SceneObjectPart s_tree = ((SceneObjectGroup)m_scene.Entities[tree]).RootPart;

                            if (s_tree.Scale.X < copse.m_maximum_scale.X && s_tree.Scale.Y < copse.m_maximum_scale.Y && s_tree.Scale.Z < copse.m_maximum_scale.Z)
                            {
                                s_tree.Scale += copse.m_rate;
                                s_tree.ParentGroup.HasGroupChanged = true;
                                s_tree.ScheduleFullUpdate();
                            }
                        }
                        else
                        {
                            m_log.DebugFormat("[TREES]: Tree not in scene {0}", tree);
                        }
                    }
                }
            }
        }

        private void seedTrees()
        {
            foreach (Copse copse in m_copse)
            {
                if (!copse.m_frozen)
                {
                    foreach (UUID tree in copse.m_trees)
                    {
                        if (m_scene.Entities.ContainsKey(tree))
                        {
                            SceneObjectPart s_tree = ((SceneObjectGroup)m_scene.Entities[tree]).RootPart;

                            if (copse.m_trees.Count < copse.m_tree_quantity)
                            {
                                // Tree has grown enough to seed if it has grown by at least 25% of seeded to full grown height
                                if (s_tree.Scale.Z > copse.m_initial_scale.Z + (copse.m_maximum_scale.Z - copse.m_initial_scale.Z) / 4.0)
                                {
                                    if (Util.RandomClass.NextDouble() > 0.75)
                                    {
                                        SpawnChild(copse, s_tree);
                                    }
                                }
                            }
                        }
                        else
                        {
                            m_log.DebugFormat("[TREES]: Tree not in scene {0}", tree);
                        }
                    }
                }
            }
        }

        private void killTrees()
        {
            foreach (Copse copse in m_copse)
            {
                if (!copse.m_frozen && copse.m_trees.Count >= copse.m_tree_quantity)
                {
                    foreach (UUID tree in copse.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 (UUID picktree in copse.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 = Vector3.Distance(pickedTree.AbsolutePosition, selectedTree.AbsolutePosition);

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

                            if (Util.RandomClass.NextDouble() < killLikelyhood)
                            {
                                // Delete tree and alert clients (not silent)
                                m_scene.DeleteSceneObject(selectedTree.ParentGroup, false);
                                copse.m_trees.Remove(selectedTree.ParentGroup.UUID);
                                break;
                            }
                        }
                        else
                        {
                            m_log.DebugFormat("[TREES]: Tree not in scene {0}", tree);
                        }
                    }
                }
            }
        }

        private void SpawnChild(Copse copse, SceneObjectPart s_tree)
        {
            Vector3 position = new Vector3();

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

            if (position.X <= (m_scene.RegionInfo.RegionSizeX - 1) && position.X >= 0 &&
                position.Y <= (m_scene.RegionInfo.RegionSizeY - 1) && position.Y >= 0 &&
                Util.GetDistanceTo(position, copse.m_seed_point) <= copse.m_range)
            {
                UUID uuid = m_scene.RegionInfo.EstateSettings.EstateOwner;

                CreateTree(uuid, copse, position);
            }
        }

        private void CreateTree(UUID uuid, Copse copse, Vector3 position)
        {

            position.Z = (float)m_scene.Heightmap[(int)position.X, (int)position.Y];
            if (position.Z >= copse.m_treeline_low && position.Z <= copse.m_treeline_high)
            {
                SceneObjectGroup tree = AddTree(uuid, UUID.Zero, copse.m_initial_scale, Quaternion.Identity, position, copse.m_tree_type, false);

                tree.Name = copse.ToString();
                copse.m_trees.Add(tree.UUID);
                tree.SendGroupFullUpdate();
            }
        }

        private void CalculateTrees_Elapsed(object sender, ElapsedEventArgs e)
        {
            growTrees();
            seedTrees();
            killTrees();
        }
    }
}