using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;

namespace Engine.Http
{

    /// <summary>接受消息委托</summary>
    public delegate bool HandleHttpMessage(HttpResponse httpResponse);

    /// <summary>http控制器</summary>
    internal class HttpManager
    {
        #region 单利
        private static HttpManager _Instance;
        /// <summary>单利函数</summary>
        public static HttpManager GetInstance()
        {
            if (_Instance == null)
            {
                _Instance = new HttpManager();
            }
            return _Instance;
        }
        #endregion

        public const float ResponseOverTimeLimit = 80000;

        /// <summary>接受到消息事件</summary>
        private HandleHttpMessage onHandleHttpMessage = null;

        /// <summary>请求列表</summary>
        private List<HttpMsg> mMsgList = new List<HttpMsg>();

        /// <summary>是否有消息正在请求中，优化Update函数</summary>
        private bool IsMsgRquestIng = false;
        
        /// <summary>添加接受消息事件</summary>
        public void AddHttpMessageEvent(HandleHttpMessage handleHttpMessage)
        {
            onHandleHttpMessage += handleHttpMessage;
        }

        /// <summary>删除接受消息事件</summary>
        public void DelHttMessageEvent(HandleHttpMessage handleHttpMessage)
        {
            onHandleHttpMessage -= handleHttpMessage;
        }

        /// <summary>发送消息</summary>
        public void SendMessage(HttpRequest httpRequest, Action<HttpResponse> callback = null)
        {
            //获得消息对象
            HttpMsg httpMsg = OnGetHttpMsg();

            //发送请求
            httpMsg.SendMsg(httpRequest, callback);
            //修改等待标记
            IsMsgRquestIng = true;
        }

        /// <summary>得到一个HttpMsg对象</summary>
        private HttpMsg OnGetHttpMsg()
        {
            HttpMsg httpMsg = null;
            int msgCount = mMsgList.Count;
            for (int i = 0; i < msgCount; i++)
            {
                if (!mMsgList[i].IsUseIng)
                {
                    httpMsg = mMsgList[i];
                    break;
                }
            }

            if (httpMsg==null)
            {
                httpMsg = new HttpMsg();
                mMsgList.Add(httpMsg);
            }

            return httpMsg;
        }

        /// <summary>帧频函数</summary>
        public void OnUpdate(int nTime)
        {
            //不存在消息处理逻辑，跳出，缓存全部的已经收到消息
            if (!IsMsgRquestIng)
            {
                return;
            }

            int msgCount = mMsgList.Count;
            for (int i = 0; i < msgCount; i++)
            {
                if (mMsgList[i].IsUseIng)
                {
                    mMsgList[i].OnUpdate(nTime);
                }
            }
        }

        /// <summary>帧频函数</summary>
        public void OnFixedUpdate(int nTime)
        {
            //不存在消息处理逻辑，跳出，缓存全部的已经收到消息
            if (onHandleHttpMessage == null || !IsMsgRquestIng)
            {
                return;
            }

            bool isRequestIng = false;
            int msgCount = mMsgList.Count;
            for (int i = 0; i < msgCount; i++)
            {
                //没用使用中直接跳过
                if (!mMsgList[i].IsUseIng)
                { continue; }

                //执行完成逻辑
                if (mMsgList[i].IsRequestComplete)
                {
                    //执行回调
                    onHandleHttpMessage(mMsgList[i].mHttpResponse);
                    mMsgList[i].SendCallBack();
                    //释放消息对象
                    mMsgList[i].Reset();
                    //修改等待标记
                    isRequestIng = true;
                }
                //修改等待标记
                else
                {
                    if(mMsgList[i].IsTimeout)
                        mMsgList[i].Reset();
                    isRequestIng = true;
                }
            }

            //修改消息检查标记
            IsMsgRquestIng = isRequestIng;
        }
    }
}