/****************************************************************************
 * Copyright (c) 2017 snowcold
 * Copyright (c) 2021.1 liangxie
 * 
 * https://qframework.cn
 * https://github.com/liangxiegame/QFramework
 * https://gitee.com/liangxiegame/QFramework
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ****************************************************************************/

using UnityEngine;

namespace QFramework
{
    using System;
    using System.Collections.Generic;

    #region 事件接口

    public delegate void OnEvent(int key, params object[] param);

    #endregion

    public class QEventSystem :  IPoolable,ISingleton
    {
        public static QEventSystem Instance => SingletonProperty<QEventSystem>.Instance;


        //private bool mIsRecycled = false;
        private readonly Dictionary<int, ListenerWrap> mAllListenerMap = new Dictionary<int, ListenerWrap>(50);

        public bool IsRecycled { get; set; }

        private QEventSystem() {}

        #region 内部结构

        private class ListenerWrap
        {
            private LinkedList<OnEvent> mEventList;

            public bool Fire(int key, params object[] param)
            {
                if (mEventList == null)
                {
                    return false;
                }

                var next = mEventList.First;
                OnEvent call = null;
                LinkedListNode<OnEvent> nextCache = null;

                while (next != null)
                {
                    call = next.Value;
                    nextCache = next.Next;
                    call(key, param);

                    next = next.Next ?? nextCache;
                }

                return true;
            }

            public bool Add(OnEvent listener)
            {
                if (mEventList == null)
                {
                    mEventList = new LinkedList<OnEvent>();
                }

                if (mEventList.Contains(listener))
                {
                    return false;
                }

                mEventList.AddLast(listener);
                return true;
            }

            public void Remove(OnEvent listener)
            {
                if (mEventList == null)
                {
                    return;
                }

                mEventList.Remove(listener);
            }

            public void RemoveAll()
            {
                if (mEventList == null)
                {
                    return;
                }

                mEventList.Clear();
            }
        }

        #endregion

        #region 功能函数

        public bool Register<T>(T key, OnEvent fun) where T : IConvertible
        {
            var kv = key.ToInt32(null);
            ListenerWrap wrap;
            if (!mAllListenerMap.TryGetValue(kv, out wrap))
            {
                wrap = new ListenerWrap();
                mAllListenerMap.Add(kv, wrap);
            }

            if (wrap.Add(fun))
            {
                return true;
            }

            Debug.LogWarning("Already Register Same Event:" + key);
            return false;
        }

        public void UnRegister<T>(T key, OnEvent fun) where T : IConvertible
        {
            ListenerWrap wrap;
            if (mAllListenerMap.TryGetValue(key.ToInt32(null), out wrap))
            {
                wrap.Remove(fun);
            }
        }

        public void UnRegister<T>(T key) where T : IConvertible
        {
            ListenerWrap wrap;
            if (mAllListenerMap.TryGetValue(key.ToInt32(null), out wrap))
            {
                wrap.RemoveAll();
                wrap = null;

                mAllListenerMap.Remove(key.ToInt32(null));
            }
        }

        public bool Send<T>(T key, params object[] param) where T : IConvertible
        {
            int kv = key.ToInt32(null);
            ListenerWrap wrap;
            if (mAllListenerMap.TryGetValue(kv, out wrap))
            {
                return wrap.Fire(kv, param);
            }
            return false;
        }

        public void OnRecycled()
        {
            mAllListenerMap.Clear();
        }

        #endregion
        
        
        #region 高频率使用的API
        public static bool SendEvent<T>(T key,params object[] param) where T : IConvertible
        {
            return Instance.Send(key, param);
        }

        public static bool RegisterEvent<T>(T key, OnEvent fun) where T : IConvertible
        {
            return Instance.Register(key, fun);
        }

        public static void UnRegisterEvent<T>(T key, OnEvent fun) where T : IConvertible
        {
            Instance.UnRegister(key, fun);
        }
        #endregion

        public void OnSingletonInit()
        {
            
        }
    }
}