using CommonAI.Zone;
using CommonAI.Zone.ZoneEditor;
using CommonLang;
using CommonLang.Log;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CommonTickBattle.Battle
{
    public class Battle : InstanceZoneListener, IDisposable
    {
        protected readonly Logger log = LoggerFactory.GetLogger("ZoneNode");

        private readonly EditorTemplates mDataRoot;
        private readonly TemplateManager mTemplates;
        private readonly TBConfig mConfig;

        private readonly uint mUpdateInterval;
        private readonly uint mRequestLagging;
        private readonly uint mRequestLaggingTick;
        private readonly uint mResponseLagging;
        private readonly uint mResponseLaggingTick;

        //------------------------------------------------------------------------------------------------------------
        // 内部主线程命令 //
        private SceneData mSceneData;
        private EditorScene mZone;
        private SyncMessageQueue<Task> mTasks = new SyncMessageQueue<Task>();
        private ActionQueue mQueueActions = new ActionQueue();
        private bool mShutDown = false;
        private bool mStarted = false;
        private bool mRunning = false;
        //------------------------------------------------------------------------------------------------------------
        public Battle(EditorTemplates data_root, TBConfig cfg)
        {
            this.mDataRoot = data_root;
            this.mTemplates = data_root.Templates;
            this.mConfig = cfg;
            this.mUpdateInterval = cfg.GAME_FIXED_UPDATE_INTERVAL_MS;
            this.mRequestLagging = cfg.GAME_REQUEST_LAGGING_MS;
            this.mRequestLaggingTick = mRequestLagging / mUpdateInterval;
            this.mResponseLagging = cfg.GAME_RESPONSE_LAGGING_MS;
            this.mResponseLaggingTick = mResponseLagging / mUpdateInterval;
        }
        //------------------------------------------------------------------------------------------------------------
        public string Name { get { return (mSceneData != null) ? mSceneData.ToString() : "null"; } }
        public SceneData SceneData { get { return mSceneData; } }
        public EditorTemplates DataRoot { get { return mDataRoot; } }
        public TemplateManager Templates { get { return mTemplates; } }
        public int SceneID { get { return mSceneData.ID; } }
        public EditorScene Zone { get { return mZone; } }
        //------------------------------------------------------------------------------------------------------------
        /// <summary>
        /// 总共跑了多少帧
        /// </summary>
        public ulong CurrentTick { get { return mZone.Tick; } }
        /// <summary>
        /// 每帧多少毫秒
        /// </summary>
        public uint UpdateIntervalMS { get { return mUpdateInterval; } }
        /// <summary>
        /// Local->Host 超时时间(毫秒)
        /// </summary>
        public uint RequestLaggingMS { get { return mRequestLagging; } }
        /// <summary>
        /// Host->Local 超时时间(毫秒)
        /// </summary>
        public uint ResponseLaggingMS { get { return mResponseLagging; } }
        /// <summary>
        /// Local->Host 超时时间(帧)
        /// </summary>
        public uint RequestLaggingTick { get { return mRequestLaggingTick; } }
        /// <summary>
        /// Host->Local 超时时间(帧)
        /// </summary>
        public uint ResponseLaggingTick { get { return mResponseLaggingTick; } }
        //------------------------------------------------------------------------------------------------------------

        public override string ToString()
        {
            if (mSceneData != null)
            {
                return mSceneData.Name + "(" + mSceneData.ID + ")";
            }
            return "Unable to load scene";
        }

        //------------------------------------------------------------------------------------------------------------
        /// <summary>
        /// 房间初始化
        /// </summary>
        public void Start(SceneData data)
        {
            lock (this)
            {
                if (mStarted) { return; }
                this.mStarted = true;
                // 解析游戏服创建房间信息 //
                this.mSceneData = data;
                {
                    // 构造战斗场景 //
                    this.mZone = TemplateManager.Factory.CreateEditorScene(this.Templates, this, mSceneData);
                    // 非全屏同步，每个Client负责维护自己需要的队列 //
                    this.mZone.SyncPos = false;
                    this.mZone.IsSyncZ = false;
                    // 半同步，场景不能大于255 //
                    this.mZone.IsHalfSync = true;
                }
                this.mRunning = true;
                // 创建游戏主循环Timer //
                this.QueueTask(() =>
                {
                    OnStarted();
                    if (event_OnZoneStart != null)
                    {
                        event_OnZoneStart.Invoke(this);
                    }
                });
            }
        }

        /// <summary>
        /// 开始异步关闭房间
        /// </summary>
        public void Stop()
        {
            lock (this)
            {
                mShutDown = true;
            }
        }

        public void Dispose()
        {
            lock (this)
            {
                if (mRunning)
                {
                    throw new Exception("Battle is running");
                }
                this.OnDispose();
                this.DisposeEvents();
                if (mZone != null)
                {
                    this.mZone.Dispose();
                }
            }
        }

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

        /// <summary>
        /// 战斗场景主逻辑更新//
        /// </summary>
        public virtual void Update()
        {
            lock (this)
            {
                if (mRunning)
                {
                    int intervalMS = (int)mUpdateInterval;
                    mTasks.ProcessMessages(do_task);
                    ProcessAction();
                    OnBeginUpdate();
                    try
                    {
                        if (intervalMS > 0)
                        {
                            mZone.Update(intervalMS);
                            this.OnZoneUpdate();
                        }
                    }
                    catch (Exception err)
                    {
                        log.Error(err.Message, err);
                        OnError(err);
                    }
                    OnEndUpdate();
                    if (mShutDown)
                    {
                        mRunning = false;
                        OnStopped();
                        if (event_OnZoneStop != null)
                        {
                            event_OnZoneStop.Invoke(this);
                        }
                    }
                }
            }
        }

        void InstanceZoneListener.onEventHandler(Event e)
        {
            this.OnZoneEventHandler(e);
        }

        //------------------------------------------------------------------------------------------------------------
        #region FutureAction

        /// <summary>
        /// 想在未来某个时间点执行一个动作
        /// </summary>
        /// <param name="action"></param>
        /// <param name="tick">未来某个时间点</param>
        /// <returns></returns>
        protected virtual bool PushAction(CommonAI.Zone.Action action, ulong tick)
        {
            lock (this)
            {
                if (tick > CurrentTick)
                {
                    mQueueActions.Push(new FutureAction(action, tick));
                    return true;
                }
                else
                {
                    log.ErrorFormat("指令已过期 : AT={0} : {1}", tick, action);
                }
                return false;
            }
        }

        private void ProcessAction()
        {
            while (mQueueActions.Count > 0)
            {
                var req = mQueueActions.Pop(Zone.Tick);
                if (req != null)
                {
                    Zone.pushAction(req.action);
                }
                else
                {
                    break;
                }
            }
        }
        private class FutureAction
        {
            public readonly CommonAI.Zone.Action action;
            public readonly ulong action_tick;
            public FutureAction(CommonAI.Zone.Action action, ulong tick)
            {
                this.action = action;
                this.action_tick = tick;
            }
        }
        private class ActionQueue : IComparer<FutureAction>
        {
            private List<FutureAction> queue = new List<FutureAction>();
            public int Count { get { return queue.Count; } }
            public void Push(FutureAction req)
            {
                queue.Add(req);
                queue.Sort(this);
            }
            public FutureAction Pop(ulong tick)
            {
                if (queue.Count > 0)
                {
                    var req = queue[0];
                    if (req.action_tick == tick)
                    {
                        queue.RemoveAt(0);
                        return req;
                    }
                }
                return null;
            }
            public int Compare(FutureAction x, FutureAction y)
            {
                return (int)x.action_tick - (int)y.action_tick;
            }
        }
        #endregion
        //---------------------------------------------------------------------------------------

        protected internal delegate void Task();
        /// <summary>
        /// 保证在Task内部执行的代码线程安全
        /// </summary>
        /// <param name="task"></param>
        protected internal void QueueTask(Task task)
        {
            mTasks.Enqueue(task);
        }

        private void do_task(Task task)
        {
            task.Invoke();
        }

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

        protected virtual void OnStarted() { }
        protected virtual void OnStopped() { }
        protected virtual void OnZoneUpdate() { }
        protected virtual void OnBeginUpdate() { }
        protected virtual void OnEndUpdate() { }
        protected virtual void OnZoneEventHandler(Event e) { }
        protected virtual void OnError(Exception err) { }
        protected virtual void OnDispose() { }

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

        protected virtual void DisposeEvents()
        {
            this.event_OnZoneStart = null;
            this.event_OnZoneStop = null;
        }
        private Action<Battle> event_OnZoneStart;
        private Action<Battle> event_OnZoneStop;
        public event Action<Battle> OnBattleStart { add { event_OnZoneStart += value; } remove { event_OnZoneStart -= value; } }
        public event Action<Battle> OnBattleStop { add { event_OnZoneStop += value; } remove { event_OnZoneStop -= value; } }
        //---------------------------------------------------------------------------------------------------

    }


}