using System;
using System.Collections.Generic;

using System.Text;
using Thousandto.Core.Base;
using Thousandto.Code.Center;
using Thousandto.Core.Framework;
using UnityEngine;

namespace Thousandto.Code.Logic
{
    /// <summary>
    /// 心跳系统,
    /// 这里主要处理与服务器的定时信息发送
    /// </summary>
    public class HeartSystem
    {
        //10秒 再加500毫秒的误差，避免误杀,这里的单位是毫米
        private const float CN_SEND_HEART_INTERVAL = 10.5f * 1000;
        //20秒,这里等待返回超时的话,再次发送消息的间隔时间,单位毫秒
        private const float CN_SEND_TIMEOUT_HEART_INTERVAL = 20 * 1000;
        //等待第一次接受数据的超时时间,2分钟
        private const float CN_WAIT_FIRST_RECIEVED_TIMEOUT = 2 * 60 * 1000;

        //做线程锁处理
        private static object _lockObj;

        //统计连续发送心跳的个数
        private int _sendHeartMsgCounter = 0;
        //消息延迟次数
        private int _msgDelayTimes = 0;

        //是否允许心跳线程
        private bool _enable = false; 

        //等待服务器应答
        private bool _waitServerRespond = false; 

        //普通心跳消息计时器
        private float _normalHeartTimer = 0;  

        //发送消息时间
        private DateTime _sendTime = DateTime.Now;

        //接收响应时间
        private DateTime _receiveTime = DateTime.Now;

        //启动时间
        private DateTime _enableTime = DateTime.Now;
      
        //服务器时间
        private double _serverTime = 0f;
        //切换到后台心跳计时器
        private float _inBackgroundTimer = 0f;
        //切换到后台的系统Tick
        int _startBackgroundTick = 0;
        //服务器时区偏移秒数
        private int _serverZoneOffset = 0;

        //服务器同步时间(UTC时间)
        private double _serverUTCTime = -1;
        //服务器同步时间(UTC时间)
        public double ServerTime
        {
            get
            {
                return _serverUTCTime;
            }
        }
   

        //服务器时区偏移秒数
        public int ServerZoneOffset
        {
            get
            {
                return _serverZoneOffset;
            }
        }

        //服务器时区时间
        public double ServerZoneTime
        {
            get
            {
                return ServerTime + _serverZoneOffset;
            }
        }

        //网络延迟ping值
        public int NetPingValue { get; set; }

        //是否已经接受到心跳数据
        public bool IsReceiveHeart { get; private set; }

        //测试停止心跳
        public bool TestStopReceiveHeart { get; set; }

        public HeartSystem()
        {
            _lockObj = new object();
            IsReceiveHeart = false;
            TestStopReceiveHeart = false;           
        }

        public void SetServerZoneOffset(int zoneOffset)
        {
            _serverZoneOffset = zoneOffset;
        }

        //网络线程的心跳处理
        public void OnNetworkThreadTick(float deltaByms)
        {
            if (_enable == false) return;

            if (IsReceiveHeart)
            {//当服务器发送过心跳给客户端就正常心跳逻辑
                //根据服务器是否返回,来判断客户端的时间间隔是否正确.
                if (_waitServerRespond)
                {
                    NetPingValue += (int)(deltaByms);

                    //这里做超时判断,这里的判断时通过发送时间来判断
                    var elapse = (DateTime.Now - _sendTime).TotalMilliseconds;
                    if (elapse > CN_SEND_TIMEOUT_HEART_INTERVAL)
                    {
                        SendReqHeartMsg();
                    }
                }
                else
                {
                    //如果已经接到服务器反馈的消息,那么这里就准备下次的心跳发送
                    //这里是通过接受消息的时间来判断
                    var elapse = (DateTime.Now - _receiveTime).TotalMilliseconds;
                    if (elapse >= CN_SEND_HEART_INTERVAL || elapse < 0)
                    {
                        SendReqHeartMsg();
                    }
                }
            }
            else {
                //当服务器一直没有发送心跳消息给客户端,那么就需要这里做一下驱动才可以.
                if ((DateTime.Now - _enableTime).TotalMilliseconds > CN_WAIT_FIRST_RECIEVED_TIMEOUT)
                {
                    _enableTime = DateTime.Now;
                    SendReqHeartMsg();
                }
            }

        }

        //通过Unity的心跳来处理
        public void Update(float delta)
        {
            //计算当前帧的服务器时间
            _serverUTCTime =  _serverTime + (DateTime.Now - _receiveTime).TotalSeconds;

            if (_enable)
            {
                //这里判断是否需要重连
                CheckNeedReconnect();
            }
        }

        //开启心跳处理
        public void EnabelHeartMsg(bool enable)
        {
            Debug.Log("心跳设置:"+enable);
            _enable = enable;
            _sendHeartMsgCounter = 0;
            _msgDelayTimes = 0;
            _enableTime = DateTime.Now;
            if (enable)
            {
                GameCenter.Networker.RecordMsgTagTime = Time.realtimeSinceStartup;
            }
        } 

        public void Uninitialize()
        {
            IsReceiveHeart = false;
            EnabelHeartMsg(false);
        }

        //打断网络,启动重连
        private bool CheckNeedReconnect()
        {
            //客户端发送了3次心跳都没收到服务器返回，则主动断掉socket
            if (_msgDelayTimes > 3)
            {
                //开启断线重连的话就复位计数
                _msgDelayTimes = 0;

                if ( !Application.isEditor)
                {//编辑器状态下不进入断线重连状态
                    //游戏主场景才做主动断线操作
                    if (GameCenter.GameStateSystem != null && GameCenter.GameStateSystem.IsCurState((int)GameStateId.World))
                    {
                        //停止心跳监听
                        _enable = false;
                        Debug.LogError("服务器心跳无反馈,启动断线重连机制.");
                        GameCenter.Networker.Disconnect();
                        GameCenter.ReconnectSystem.Reconnect();
                        return true;
                    }
                }
                else {

                    Debug.LogError("判断重连,但因为是编辑器下所以不进行重连处理.");
                }
            }
            return false;
        }
        #region//网络通讯
        //往服务器发送请求退出的消息
        public void SendReqQuit()
        {
            MSG_Register.ReqQuit req = new MSG_Register.ReqQuit();
            req.Send();
            IsReceiveHeart = false;
            _sendHeartMsgCounter = 0;
        }

        //发送一个特殊心跳信息,让服务器重新倒计时
        public void SendReqReallyHeartMsg()
        {
            MSG_heart.ReqReallyHeart normalHeartReq = new MSG_heart.ReqReallyHeart();
            normalHeartReq.Send();
        }

        //发送普通心跳同步信息
        public void SendReqHeartMsg()
        { 
            
            MSG_heart.ReqHeart req = new MSG_heart.ReqHeart();
            req.time = TimeUtils.GetNow();
            req.Send();

           
            //记录最后一次发送时间
            _sendTime = DateTime.Now;
            //记录发送次数
            _sendHeartMsgCounter++;
            //等待服务器应答
            _waitServerRespond = true;
            //消息延迟的次数
            _msgDelayTimes++;
            //Debug.LogError("SendReqHeartMsg::" + _sendTime.ToFileTimeUtc() + ";;" + _msgDelayTimes);
        }

        

        //收到服务器下发的用于检测加速器的消息，这个时候开始进行倒计时
        public void OnHearMsgReceive(MSG_heart.ResHeart result)
        {
            if (!TestStopReceiveHeart)
            {
                //当接受到回复消息,那么延迟次数就设置为0
                _msgDelayTimes = 0;

                //这里设置不用等待了
                _waitServerRespond = false;

                _serverTime = result.serverTime;

                _receiveTime = DateTime.Now;

                if (_sendHeartMsgCounter == 0)
                {
                    //第一次获取,这里给一个随机值
                    NetPingValue = new System.Random().Next(1, 50);
                }
                else
                {
                    //从发送开始到接收为止，计算延迟
                    NetPingValue = (int)(_receiveTime - _sendTime).TotalMilliseconds;
                    //Debug.LogError("OnHearMsgRecie:::"+ _sendTime.ToFileTimeUtc()+ ";;" + _receiveTime.ToFileTimeUtc()+ ";;;" + NetPingValue);
                }
                _serverUTCTime = _serverTime + (DateTime.Now - _receiveTime).TotalSeconds;
                IsReceiveHeart = true;
            }
            //Debug.LogError("OnHearMsgReceive(MSG_heart.ResHeart result)::" + _receiveTime);
        }
        #endregion
    }
}