/*
 Sog 游戏基础库
 2016 by zouwei
 */


using System;
using System.Net;
using System.Net.Sockets;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Threading.Tasks;


namespace SogClient
{
    public class TcpClientSession : ClientSession
    {
        protected ConnectedClientSessionUpdate m_sessionUpdate;

        public TcpClientSession(ClientSessionSettings clientSettings, 
            ConnectedClientSessionUpdate updateMgr, SessionNetSelectMode mode)
            :base(clientSettings)
        {
            AllockSocket();
            m_sessionUpdate = updateMgr;
            NetSessionObj = new TcpSession(m_socketClient);
            
        }

        private void AllockSocket()
        {
            m_socketClient = new Socket(m_clientSettings.RemoteEndPoint.AddressFamily, 
                SocketType.Stream, ProtocolType.Tcp);

            m_socketClient.Blocking = false;

            m_socketClient.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, (int)1);
        }

        public override void Connect()
        {
            TraceLog.Trace("TcpClientSession.Connect from local {1} to  remote {0} sessionID:{2}", m_clientSettings.RemoteEndPoint, NetSessionObj.LocalEndPoint, NetSessionObj.SessionID);

            m_isConnected = false;
            m_isConnecting = true;


            bool connFail = false;
            try
            {
                m_socketClient.Connect(m_clientSettings.RemoteEndPoint);
            }
            catch (ObjectDisposedException ex)
            {
                TraceLog.Error("TcpClientSession.Connect {0} ObjectDisposedException message {1}",
                    m_clientSettings.RemoteEndPoint, ex.Message);

                connFail = true;
            }
            catch (InvalidOperationException ex)
            {
                TraceLog.Error("TcpClientSession.Connect {0} InvalidOperationException message {1}",
                    m_clientSettings.RemoteEndPoint, ex.Message);

                connFail = true;
            }
            catch (SocketException ex)
            {
                // 返回 WouldBlock 是正常的，微软官方解释: An operation on a nonblocking socket cannot be completed immediately.  
                // 但是返回其他异常呢？
                TraceLog.Trace("TcpClientSession.Connect {0}, wait connected finish SocketErrorCode {1},",
                    m_clientSettings.RemoteEndPoint, ex.SocketErrorCode);
            }
            catch (Exception ex)
            {
                TraceLog.Error("TcpClientSession.Connect {0} fail, exception {1}"
                    , m_clientSettings.RemoteEndPoint, ex);
				
				connFail = true;
            }

            if (connFail)
            {
                TraceLog.Error("TcpClientSession.Connect connFail is True! ");
                TcpConnectFail();
            }
        }

        public override void Reconnect()
        {
            TraceLog.Trace("TcpClientSession.Reconnect from local {1} to  remote {0} sessionID:{2}", m_clientSettings.RemoteEndPoint, NetSessionObj.LocalEndPoint, NetSessionObj.SessionID);

            // 重连时m_socketClient如果不是null，要丢掉session中未发送和未解析的信息
            if (m_socketClient != null)
            {
                TraceLog.Error("TcpClientSession.Reconnect close old socket");
                CloseSession();
            }

            //重连的时候重新allock socket，linux下必须如此
            AllockSocket();

            Connect();
        }

        private void TcpConnectFail()
        {   
            TraceLog.Trace("TcpClientSession : TcpConnectFail");
            CloseSession();
           
            SessionEventArgs arg = new SessionEventArgs();
            arg.Session = NetSessionObj;
            OnConnectFail(arg);
        }

        public override void Update(long nowMs)
        {
            UpdateConnect();
            UpdateReadWrite();
        }

        public void UpdateConnect()
        {

            if (!m_isConnecting)
            {
                return;
            }

            bool bError = m_socketClient.Poll(0, SelectMode.SelectError);
            if (bError)
            {
                TraceLog.Trace("TcpClientSession.UpdateConnect bError is True! sessionId:{0}", NetSessionObj.SessionID);
                TcpConnectFail();
            }
            else
            {
                bool bWrite = m_socketClient.Poll(0, SelectMode.SelectWrite);
                if(bWrite)
                {
                    ConnectSucc();
                }
            }
        }

        protected void UpdateReadWrite()
        {
            if (m_socketClient == null)
            {
                return;
            }

            if (m_isConnected)
            {
                if (NetSessionObj.IsSocketClosed)
                {
                    OnUpdateConnectedSocketError();
                    return;
                }

                m_sessionUpdate.AddToList(this);
            }
        }
        
        protected override void CloseSession()
        {
            TraceLog.Trace("TcpClientSession.CloseSession session {0}"
                , NetSessionObj.SessionID);

            m_isConnected = false;
            m_isConnecting = false;

            //丢弃正在发送和接收的数据，关闭socket
            NetSessionObj.Close();
            m_socketClient = null;
        }
    }
}