//using HunterProtobufCore;
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using static HaoYueNet.ServerNetworkNet4x.BaseData;

namespace HaoYueNet.ServerNetworkNet4x
{
    public class TcpSaeaServer_SourceMode
    {
        #region 定义属性
        protected int MaxRevIndexNum = 50;//响应倒计时计数最大值
        protected int MaxSendIndexNum = 3;//发送倒计时计数最大值
        protected static int TimerInterval = 3000;//计时器间隔
        //protected System.Timers.Timer _heartTimer;//心跳包计数器
        public int m_maxConnectNum;    //最大连接数  
        public int m_revBufferSize;    //最大接收字节数  
        protected BufferManager m_bufferManager;
        protected const int opsToAlloc = 2;
        Socket listenSocket;            //监听Socket  
        protected SocketEventPool m_Receivepool;
        protected SocketEventPool m_Sendpool;
        protected TokenMsgPool_SourceMode msg_pool;
        protected int m_clientCount;              //连接的客户端数量  
        protected Semaphore m_maxNumberAcceptedClients;//信号量
        protected Dictionary<Socket, AsyncUserToken> _DictSocketAsyncUserToken = new Dictionary<Socket, AsyncUserToken>();
        List<AsyncUserToken> m_clients; //客户端列表  
        public List<AsyncUserToken> ClientList { private set { m_clients = value; } get { return m_clients; } } //获取客户端列表
        #endregion

        #region 定义委托  
        /// <summary>  
        /// 客户端连接数量变化时触发  
        /// </summary>  
        /// <param name="num">当前增加客户的个数(用户退出时为负数,增加时为正数,一般为1)</param>  
        /// <param name="token">增加用户的信息</param>  
        public delegate void OnClientNumberChangeHandler(int num, AsyncUserToken token);
        /// <summary>  
        /// 接收到客户端的数据  
        /// </summary>  
        /// <param name="token">客户端</param>  
        /// <param name="buff">客户端数据</param>  
        public delegate void OnReceiveDataHandler(AsyncUserToken sk, byte[] data);
        /// <summary>
        /// 断开连接
        /// </summary>
        /// <param name="sk"></param>
        public delegate void OnDisconnectHandler(AsyncUserToken sk);
        /// <summary>
        /// 日志
        /// </summary>
        /// <param name="sk"></param>
        public delegate void OnNetLogHandler(string msg);
        #endregion

        #region 定义事件  
        /// <summary>  
        /// 客户端连接数量变化事件  
        /// </summary>
        public event OnClientNumberChangeHandler OnClientNumberChange;
        /// <summary>  
        /// 接收到客户端的数据事件  
        /// </summary>
        public event OnReceiveDataHandler OnReceive;
        /// <summary>  
        /// 接收到客户端的断开连接
        /// </summary>
        public event OnDisconnectHandler OnDisconnected;
        /// <summary>  
        /// 网络库内部输出
        /// </summary>
        public event OnNetLogHandler OnNetLog;
        #endregion

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="numConnections">最大连接数</param>  
        /// <param name="receiveBufferSize">缓存区大小</param>  
        public TcpSaeaServer_SourceMode(int numConnections, int receiveBufferSize)
        {
            m_clientCount = 0;
            m_maxConnectNum = numConnections;
            m_revBufferSize = receiveBufferSize;
            // allocate buffers such that the maximum number of sockets can have one outstanding read and   
            //write posted to the socket simultaneously
            m_bufferManager = new BufferManager(receiveBufferSize * numConnections * opsToAlloc, receiveBufferSize);

            m_Receivepool = new SocketEventPool(numConnections);
            m_Sendpool = new SocketEventPool(numConnections);

            msg_pool = new TokenMsgPool_SourceMode(numConnections);

            m_maxNumberAcceptedClients = new Semaphore(numConnections, numConnections);
        }

        #region Client操作
        /// <summary>  
        /// 初始化  
        /// </summary>  
        public void Init()
        {
            // Allocates one large byte buffer which all I/O operations use a piece of.  This gaurds   
            // against memory fragmentation  
            m_bufferManager.InitBuffer();
            m_clients = new List<AsyncUserToken>();
            // preallocate pool of SocketAsyncEventArgs objects  
            SocketAsyncEventArgs readWriteEventArg;

            for (int i = 0; i < m_maxConnectNum; i++)
            {
                readWriteEventArg = new SocketAsyncEventArgs();
                readWriteEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(IO_Completed);
                readWriteEventArg.UserToken = new AsyncUserToken();
                // assign a byte buffer from the buffer pool to the SocketAsyncEventArg object  
                m_bufferManager.SetBuffer(readWriteEventArg);
                // add SocketAsyncEventArg to the pool  
                m_Receivepool.Push(readWriteEventArg);
            }

            for (int i = 0; i < m_maxConnectNum; i++)
            {
                readWriteEventArg = new SocketAsyncEventArgs();
                readWriteEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(IO_Completed);
                readWriteEventArg.UserToken = new AsyncUserToken();

                //发送是否需要如此设置 TODO
                m_bufferManager.SetBuffer(readWriteEventArg);

                m_Sendpool.Push(readWriteEventArg);
            }
            OutNetLog("初始化完毕");
        }
        /// <summary>
        /// 启动服务
        /// </summary>
        /// <param name="localEndPoint"></param>
        /// <param name="bReuseAddress">是否端口重用</param>
        /// <returns></returns>
        public bool Start(IPEndPoint localEndPoint, bool bReuseAddress = false)
        {
            try
            {
                ClearUserToken();
                listenSocket = new Socket(localEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

                if (bReuseAddress)
                {
                    listenSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
                }

                listenSocket.Bind(localEndPoint);
                // start the server with a listen backlog of 100 connections  
                listenSocket.Listen(m_maxConnectNum);
                // post accepts on the listening socket  
                StartAccept(null);

                OutNetLog("监听:" + listenSocket.LocalEndPoint.ToString());

                //_heartTimer = new System.Timers.Timer();
                //_heartTimer.Interval = TimerInterval;
                //_heartTimer.Elapsed += CheckUpdatetimer_Elapsed;
                //_heartTimer.AutoReset = true;
                //_heartTimer.Enabled = true;
                //OutNetLog("开启定时心跳包");

                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
        /// <summary>  
        /// 停止服务  
        /// </summary>  
        public void Stop()
        {
            foreach (AsyncUserToken token in m_clients)
            {
                try
                {
                    token.Socket.Shutdown(SocketShutdown.Both);
                }
                catch (Exception) { }
            }
            try
            {
                listenSocket.Shutdown(SocketShutdown.Both);
            }
            catch (Exception) { }

            listenSocket.Close();
            int c_count = m_clients.Count;
            ClearUserToken();

            if (OnClientNumberChange != null)
                OnClientNumberChange(-c_count, null);
        }
        public void CloseClient(AsyncUserToken token)
        {
            try {token.Socket.Shutdown(SocketShutdown.Both);}
            catch (Exception) { }
        }
        /// <summary>
        /// 关闭客户端连接
        /// </summary>
        /// <param name="e"></param>
        void CloseClientSocket(SocketAsyncEventArgs e)
        {
            AsyncUserToken token = e.UserToken as AsyncUserToken;
            CloseReady(token);
            // 释放SocketAsyncEventArg，以便其他客户端可以重用它们 
            ReleaseSocketAsyncEventArgs(e);
        }
        void CloseReady(AsyncUserToken token)
        {
            OnDisconnected?.Invoke(token);
            RemoveUserToken(token);
            //如果有事件,则调用事件,发送客户端数量变化通知
            OnClientNumberChange?.Invoke(-1, token);
            // 关闭与客户端关联的套接字 
            try { token.Socket.Shutdown(SocketShutdown.Send); } catch (Exception) { }
            token.Socket.Close();
            // 递减计数器以跟踪连接到服务器的客户端总数
            Interlocked.Decrement(ref m_clientCount);
            m_maxNumberAcceptedClients.Release();
        }
        #endregion

        #region Token管理
        public AsyncUserToken GetAsyncUserTokenForSocket(Socket sk)
        {
            return _DictSocketAsyncUserToken.ContainsKey(sk) ? _DictSocketAsyncUserToken[sk] : null;
        }
        void AddUserToken(AsyncUserToken userToken)
        {
            lock (_DictSocketAsyncUserToken)
            {
                m_clients.Add(userToken);
                _DictSocketAsyncUserToken.Add(userToken.Socket, userToken);
            }
        }
        void RemoveUserToken(AsyncUserToken userToken)
        {
            lock (_DictSocketAsyncUserToken)
            {
                m_clients.Remove(userToken);
                _DictSocketAsyncUserToken.Remove(userToken.Socket);
            }
        }
        void ClearUserToken()
        {
            lock (_DictSocketAsyncUserToken)
            {
                m_clients.Clear();
                _DictSocketAsyncUserToken.Clear();
            }
        }
        /// <summary>
        /// 回收SocketAsyncEventArgs
        /// </summary>
        /// <param name="saea"></param>
        /// <exception cref="ArgumentException"></exception>
        void ReleaseSocketAsyncEventArgs(SocketAsyncEventArgs saea)
        {
            //saea.UserToken = null;//TODO
            //saea.SetBuffer(null, 0, 0);
            //saea.Dispose();
            //↑ 这里不要自作主张去清东西，否则回收回去不可用

            switch (saea.LastOperation)
            {
                case SocketAsyncOperation.Receive:
                    m_Receivepool.Push(saea);
                    break;
                case SocketAsyncOperation.Send:
                    m_Sendpool.Push(saea);
                    break;
                default:
                    throw new ArgumentException("ReleaseSocketAsyncEventArgs > The last operation completed on the socket was not a receive or send");
            }

        }
        #endregion

        #region 监听IOCP循环
        /// <summary>
        /// 开始接受客户端的连接请求的操作
        /// </summary>
        /// <param name="acceptEventArg">在服务器的侦听套接字上发出接受操作时要使用的上下文对象</param>
        public void StartAccept(SocketAsyncEventArgs acceptEventArg)
        {
            if (acceptEventArg == null)
            {
                acceptEventArg = new SocketAsyncEventArgs();
                acceptEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(AcceptEventArg_Completed);
            }
            else
            {
                // socket must be cleared since the context object is being reused  
                acceptEventArg.AcceptSocket = null;
            }

            m_maxNumberAcceptedClients.WaitOne();
            if (!listenSocket.AcceptAsync(acceptEventArg))
            {
                ProcessAccept(acceptEventArg);
            }
        }
        /// <summary>
        /// 此方法是与Socket关联的回调方法。AcceptAsync操作，并在接受操作完成时调用
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void AcceptEventArg_Completed(object sender, SocketAsyncEventArgs e)
        {
            ProcessAccept(e);
        }
        private void ProcessAccept(SocketAsyncEventArgs e)
        {
            try
            {
                Interlocked.Increment(ref m_clientCount);
                //确保监听结束时，有连接才抛给数据接收
                if (e.AcceptSocket.RemoteEndPoint != null)
                {
                    // Get the socket for the accepted client connection and put it into the   
                    //ReadEventArg object user token  
                    SocketAsyncEventArgs readEventArgs = m_Receivepool.Pop();
                    //TODO readEventArgs.UserToken这里的 UserToken 有可能是空
                    AsyncUserToken userToken;
                    if (readEventArgs.UserToken == null)
                        readEventArgs.UserToken = new AsyncUserToken();

                    userToken = (AsyncUserToken)readEventArgs.UserToken;
                    userToken.Socket = e.AcceptSocket;
                    userToken.ConnectTime = DateTime.Now;
                    userToken.Remote = e.AcceptSocket.RemoteEndPoint;
                    userToken.IPAddress = ((IPEndPoint)(e.AcceptSocket.RemoteEndPoint)).Address;


                    userToken.RevIndex = MaxRevIndexNum;
                    userToken.SendIndex = MaxSendIndexNum;

                    AddUserToken(userToken);

                    OnClientNumberChange?.Invoke(1, userToken);
                    if (!e.AcceptSocket.ReceiveAsync(readEventArgs))
                    {
                        ProcessReceive(readEventArgs);
                    }
                }
            }
            catch (Exception me)
            {
                //RuncomLib.Log.LogUtils.Info(me.Message + "\r\n" + me.StackTrace);
            }

            // Accept the next connection request  
            if (e.SocketError == SocketError.OperationAborted) return;
            StartAccept(e);
        }
        #endregion

        #region 收发IOCP循环
        /// <summary>当异步接收操作完成时，会调用此方法。
        /// 如果远程主机关闭了连接，则套接字关闭。
        /// 如果接收到数据，则将数据回显到客户端。
        /// </summary>
        /// <param name="e"></param>
        private void ProcessReceive(SocketAsyncEventArgs e)
        {
            try
            {
                // check if the remote host closed the connection  
                AsyncUserToken token = (AsyncUserToken)e.UserToken;
                if (e.BytesTransferred > 0 && e.SocketError == SocketError.Success)
                {
                    //读取数据  
                    //byte[] data = new byte[e.BytesTransferred];
                    //Array.Copy(e.Buffer, e.Offset, data, 0, e.BytesTransferred);
                    //lock (token.Buffer)
                    lock(token.memoryStream)
                    {
                        //token.Buffer.AddRange(data);
                        token.memoryStream.Write(e.Buffer, e.Offset, e.BytesTransferred);
                        do
                        {

                            //DataCallBackReady(token, data);
                            ////从数据池中移除这组数据  
                            //lock (token.Buffer)
                            //{
                            //    token.Buffer.Clear();
                            //}

                            DataCallBackReady(token, token.memoryStream.ToArray());
                            //流复用的方式 不用重新new申请
                            token.memoryStream.Position = 0;
                            token.memoryStream.SetLength(0);

                            //这里API处理完后,并没有返回结果,当然结果是要返回的,却不是在这里, 这里的代码只管接收.  
                            //若要返回结果,可在API处理中调用此类对象的SendMessage方法,统一打包发送.不要被微软的示例给迷惑了.  
                        } while (token.memoryStream.Length > 0);
                        //} while (token.Buffer.Count > 4);
                    }

                    //继续接收. 为什么要这么写,请看Socket.ReceiveAsync方法的说明  
                    if (!token.Socket.ReceiveAsync(e))
                    {
                        this.ProcessReceive(e);
                    }
                }
                else
                {
                    CloseClientSocket(e);
                }
            }
            catch (Exception xe)
            {
                //RuncomLib.Log.LogUtils.Info(xe.Message + "\r\n" + xe.StackTrace);
            }
        }
        private void ProcessSend(SocketAsyncEventArgs e)
        {
            if (e.SocketError == SocketError.Success)
            {
                //TODO
            }
            else
            {
                CloseClientSocket(e);
                return;
            }
            ReleaseSocketAsyncEventArgs(e);
            SendForMsgPool();
        }
        void IO_Completed(object sender, SocketAsyncEventArgs e)
        {
            // determine which type of operation just completed and call the associated handler  

            switch (e.LastOperation)
            {
                case SocketAsyncOperation.Receive:
                    ProcessReceive(e);
                    break;
                case SocketAsyncOperation.Send:
                    ProcessSend(e);
                    break;
                default:
                    throw new ArgumentException("The last operation completed on the socket was not a receive or send");
            }
        }
        #endregion

        #region 发送
        int sendrun = 0;
        /// <summary>
        /// 对外暴露的发送消息
        /// </summary>
        /// <param name="CMDID"></param>
        /// <param name="data">序列化之后的数据</param>
        public void SendToSocket(Socket sk, byte[] data)
        {
            AsyncUserToken token = GetAsyncUserTokenForSocket(sk);
            SendWithIndex(token,  data);
        }
        void SendForMsgPool()
        {
            //if (flag_SendForMsgPool) return;
            try
            {
                if (sendrun < msg_pool.Count || msg_pool.Count < 1)
                    return;

                sendrun++;
                while (msg_pool.Count > 0)
                {
                    try
                    {
                        TokenWithMsg_SourceMode msg = msg_pool.Dequeue();
                        //OutNetLog("从信息池取出发送");
                        //是心跳包
                        if (msg.bHeartbeat)
                        {
                            SendHeartbeatMessage(msg.token);
                        }
                        else
                        {
                            SendMessage(msg.token,msg.data);
                        }
                        msg = null;
                    }
                    catch
                    {
                        OutNetLog("==============================================>");
                    }
                }
                sendrun--;
                OutNetLog("!!!!!!!!!!!!!!!!!!!!!!!!!!");
            }
            catch (Exception ex)
            {
                OutNetLog(ex.ToString());
            }

        }

        /// <summary>
        /// 发送心跳包
        /// </summary>
        /// <param name="token"></param>
        void SendHeartbeatMessage(AsyncUserToken token)
        {
            if (token == null || token.Socket == null || !token.Socket.Connected)
                return;
            try
            {
                if (m_Sendpool.Count > 0)
                {
                    SocketAsyncEventArgs myreadEventArgs = m_Sendpool.Pop();
                    myreadEventArgs.UserToken = token;
                    myreadEventArgs.AcceptSocket = token.Socket;
                    //直接写入SocketAsyncEventArgs的Buff
                    HunterNet_Heartbeat.SetDataToSocketAsyncEventArgs(myreadEventArgs);

                    //若不需要等待
                    if (!token.Socket.SendAsync(myreadEventArgs))
                    {
                        m_Sendpool.Push(myreadEventArgs);
                    }
                    return;
                }
                else
                {
                    //先压入队列，等待m_Sendpool回收
                    msg_pool.Enqueue(new TokenWithMsg_SourceMode() { token = token, bHeartbeat = true });
                    //OutNetLog("！！！！压入消息发送队列MSG_Pool");
                    return;
                }
            }
            catch (Exception e)
            {
                OutNetLog(e.ToString());
            }
        }

        /// <summary>
        /// 发送数据并计数
        /// </summary>
        /// <param name="data"></param>
        void SendWithIndex(AsyncUserToken token,byte[] data)
        {
            try
            {
                //发送数据
                SendMessage(token, data);
                token.SendIndex = MaxSendIndexNum;
            }
            catch
            {
                CloseReady(token);
            }
        }

        void SendMessage(AsyncUserToken token, byte[] data)
        {
            if (token == null || token.Socket == null || !token.Socket.Connected)
                return;
            try
            {
                if (m_Sendpool.Count > 0)
                {
                    SocketAsyncEventArgs myreadEventArgs = m_Sendpool.Pop();
                    myreadEventArgs.UserToken = token;
                    myreadEventArgs.AcceptSocket = token.Socket;
                    myreadEventArgs.SetBuffer(data, 0, data.Length);  //将数据放置进去.  

                    //若不需要等待
                    if (!token.Socket.SendAsync(myreadEventArgs))
                    {
                        m_Sendpool.Push(myreadEventArgs);
                    }
                    return;
                }
                else
                {
                    //先压入队列，等待m_Sendpool回收
                    msg_pool.Enqueue(new TokenWithMsg_SourceMode() { token = token,  data = data ,bHeartbeat = false});
                    //OutNetLog("！！！！压入消息发送队列MSG_Pool");
                    return;
                }
            }
            catch (Exception e)
            {
                OutNetLog(e.ToString());
            }
        }
        #endregion

        #region 处理前预备
        private void DataCallBackReady(AsyncUserToken sk, byte[] data)
        {
            //增加接收计数
            sk.RevIndex = MaxRevIndexNum;

            try
            {
                //将数据包交给后台处理,这里你也可以新开个线程来处理.加快速度. 
                OnReceive?.Invoke(sk, data);
            }
            catch (Exception ex)
            {
                OutNetLog("数据解析错误");
            }
        }
        private void OutNetLog(string msg)
        {
            OnNetLog?.Invoke(msg);
        }
        #endregion

        #region 心跳包
        /*
        /// <summary>
        /// 发送心跳包
        /// </summary>
        /// <param name="sk"></param>
        /// 
        private void SendHeartbeatWithIndex(AsyncUserToken token)
        {
            if (token == null || token.Socket == null || !token.Socket.Connected)
                return;
            try
            {
                //OutNetLog(DateTime.Now.ToString() + "发送心跳包");
                token.SendIndex = MaxSendIndexNum;
                SendHeartbeatMessage(token);
            }
            catch (Exception e)
            {
                CloseReady(token);
            }
        }
        /// <summary>
        /// 心跳包时钟事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void CheckUpdatetimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            for (int i = 0; i < m_clients.Count(); i++)
            {
                //接收服务器数据计数
                m_clients[i].RevIndex--;
                if (m_clients[i].RevIndex <= 0)
                {
                    //判定掉线
                    CloseReady(m_clients[i]);
                    return;
                }

                //发送计数
                m_clients[i].SendIndex--;
                if (m_clients[i].SendIndex <= 0)//需要发送心跳包了
                {
                    //重置倒计时计数
                    m_clients[i].SendIndex = MaxSendIndexNum;
                    SendHeartbeatWithIndex(m_clients[i]);
                }
            }
        }
        */
        #endregion
    }
}
