using System;
using XGame.Framework.Interfaces;
using XGame.Framework.Json;
using XGame.Framework.Time;

namespace XGame.Framework.Network
{
    public partial class NetModule : INetModule, IDisposable, IHeartbeatListener, IMsgReceiverListener, ISessionContext
    {
        public IMsgSender Sender { get; private set; }
        public IMsgGenerator Generator { get; private set; }
        public IMsgProcesser Processer { get; private set; }
        public IFrameSynchronizer Synchronizer { get; private set; }
        public ISerializer Serializer { get; private set; }
        public ITimeModule Time { get; private set; }
        private IHeartbeat _heartBeat;
        private MsgContextCache _contextCache;
        private MsgContextCache ContextCache => _contextCache ??= new MsgContextCache();

        /// <summary>网络消息打印开关</summary>
        public bool IsDebug { get; set;}
        /// <summary>加密开关，SetKey时默认设置</summary>
        public bool IsOpenEncrypt {  get; private set;}
        private IMsgEncryptor _encryptor;
        public IMsgEncryptor Encryptor => _encryptor ??= new RC4Encryptor();
        private IMsgCompressor _compressor;
        public IMsgCompressor Compressor => _compressor ??= new ZstdCompressor();

        #region 网络会话变量
        private TCPSession _tcpRemote;
        private WSSession _wsRemote;
        private IRemoteSession _curRemote;
        private AddressInfo _addressInfo;
        #endregion

        private IBytesReader _bytesReader;
        private INetModuleListener _listener;

        public NetModule(ITimeModule time, IMsgGenerator generator, INetModuleListener listener)
        {
            Time = time;
            Generator = generator;
            _listener = listener;
            Sender = new MsgSender(this);
            var receiver = new MsgReceiver(this, this);
            _bytesReader = new BytesReader(receiver);
            Processer = new MsgProcesser(this, this);
            Serializer = new JsonSerializer(generator);
            Synchronizer = new FrameSynchronizer(_bytesReader, Processer, this);
        }

        #region 接口实现
        public void SetEncryptKey(string key)
        {
            IsOpenEncrypt = !string.IsNullOrEmpty(key);
            if (IsOpenEncrypt)
            {
                Encryptor.SetKey(key);
            }
        }
        public void Connect(AddressInfo address)
        {
            Assert.IsNotNull(address, $"[NetModule] 连接失败, AddressInfo 不能为空.");
            _addressInfo = address;
            InnerConnect(address);
        }

        public void Disconnect()
        {
            _heartBeat?.Stop();
            Synchronizer.Reset();
            _bytesReader.Reset();
            _curRemote?.Disconnect();
            _curRemote = null;
        }
        public void Reconnect()
        {
            Disconnect();
            Assert.IsNotNull(_addressInfo, $"[NetModule] 重连失败, AddressInfo 不能为空.");
            InnerConnect(_addressInfo);
        }
        void INetModule.Send(IMsgRequest msg, bool isFilter)
        {
            var args = new RequestEventArgs()
            {
                protoId = msg.ProtocolID,
                isFilter = isFilter,
            };
            if (!IsConnected)
            {
                args.code = ESessionCode.SendNoConnect;
            }
            else if (!Sender.IsCanSend(msg, isFilter))
            {
                args.code = ESessionCode.SendFilted;
            }
            else
            {
                if (IsDebug)
                {
                    Log.Info("[NetModule] Send <{1}> {2}: Seq:{4} Timestamp:{0}\n{3}",
                        Time.GetNowTime(ClockType.Client), msg.ProtocolID, msg.GetType().Name, XJson.ToJson(msg), msg.InstanceID);
                }
                ContextCache.Push(msg.InstanceID, msg.ProtocolID, msg.Context);
                args.seqId = msg.InstanceID;
                args.code = Sender.Send(msg, IsOpenEncrypt);
            }
            _listener?.OnRequest(args);
        }
        void INetModule.StartHeartbeat()
        {
            if (IsConnected)
            {
                var impl = _heartBeat ??= new Heartbeat(this, this);
                impl.Start();
            }
            else
            {
                Log.Error($"[NetModule] 心跳启动失败, 网络还没连接或初始化.");
            }
        }

        void INetModule.StopHeartbeat()
        {
            _heartBeat?.Stop();
        }
        void IDisposable.Dispose()
        {
            _listener = null;
            _bytesReader = null;
            (Synchronizer as IDisposable)?.Dispose();
            (Processer as IDisposable)?.Dispose();
            (Sender as IDisposable)?.Dispose();
            (_heartBeat as IDisposable)?.Dispose();
            _heartBeat = null;
            _contextCache?.Dispose();
            _contextCache = null;
            _compressor = null;
            _encryptor = null;

            (_tcpRemote as IDisposable)?.Dispose();
            (_wsRemote as IDisposable)?.Dispose();
            _curRemote = null;
            _tcpRemote = null;
            _wsRemote = null;
            _addressInfo = null;
        }
        public IRemoteSession Session 
        {
            get 
            {
                Assert.IsNotNull(_curRemote, $"[NetModule] 网络还没连接或初始化.");
                return _curRemote;
            } 
        }
        void IHeartbeatListener.OnTimeout()
        {
            //TODO 广播
            _listener?.OnHeartbeatTimeout();
        }
        #endregion

        #region IMsgReceiverListener 实现
        void IMsgReceiverListener.OnHeartbeatReceived()
        {
            _heartBeat?.Receive();
        }
        void IMsgReceiverListener.OnPreMessage(IMessage message)
        {
            Sender.VerifyInstanceID(message.InstanceID);
            if (message is IMsgResponse)
            {
                var seqID = message.InstanceID;
                var protoID = message.ProtocolID;
                if (ContextCache.Pop(seqID, out var reqProtocol, out var reqContext))
                {
                    if (protoID != reqProtocol)
                    {
                        if (protoID != NetDefine.GATEWAY_ERROR_ID)//protoId=1为网关异常消息，由业务处理，框架屏蔽此项的提示
                            Log.Error($"[NetModule] [Response] ProtoID和Seq没有对应 recv-ProtoID:{protoID} seq:{seqID} seq-ProtoID:{reqProtocol}");
                        _listener?.OnResponseSeqError(seqID, reqProtocol, protoID);
                    }
                    else
                    { // 将缓存的Context赋值给Response
                        message.Context = reqContext;
                    }
                }
                else
                {
                    //收到 没有context的消息
                    if (protoID != NetDefine.GATEWAY_ERROR_ID)//protoId=1为网关异常消息，由业务处理，框架屏蔽此项的提示
                        Log.Error($"[NetModule] [Response] seq:{seqID} protoid:{protoID} seq没有对应的contextInfo");
                    _listener?.OnResponseSeqError(seqID, -1, protoID);
                }
            }
            if (IsDebug)
            {
                Log.Info("[NetModule] Receive <{1}> {2}: Seq:{4} Timestamp:{0}\n{3}",
                    Time.GetNowTime(ClockType.Client), message.ProtocolID, message.GetType().Name, XJson.ToJson(message), message.InstanceID);
            }
        }
        void IMsgReceiverListener.OnResponseFinish(ResponseEventArgs args)
        {
            _listener?.OnResponseFinish(args);
        }

        void IMsgReceiverListener.OnEvent(ESessionCode code, Exception exception)
        {
            LogException(code, exception);
            SessionEventArgs args = default;
            args.code = code;
            switch (code)
            {
                case ESessionCode.StartConnect:
                    _listener?.OnConnectStart();
                    return;
                case ESessionCode.Connected:
                    (Sender as IReset)?.Reset();//seq、lastid重置
                    ContextCache.Reset();//清空缓存
                    _listener?.OnConnected();
                    return;
                case ESessionCode.Disconnect:
                    _listener?.OnDisconnected();
                    return;
                case ESessionCode.ConnectFail:
                    //args.errorMsg = exception.Message;
                    //break;
                case ESessionCode.DisconnectError:
                case ESessionCode.SendException:
                case ESessionCode.RecvError:
                    args.errorMsg= exception.Message;
                    if (exception is System.Net.Sockets.SocketException se)
                    {
                        args.isSocketError = true;
                        args.socketError = se.SocketErrorCode;
                    }
                    else if (exception is Web.WebSocketException webEx)
                    {
                        args.websocketCode = webEx.code;
                    }
                    break;
            }
            _listener?.OnSessionError(args);
        }
        private void LogException(ESessionCode sessionCode, Exception ex)
        {
            if (ex != null)
            {
                string socketCode;
                if (ex is System.Net.Sockets.SocketException se)
                {
                    socketCode = se.SocketErrorCode.ToString();
                }
                else
                {
                    socketCode = "NONE";
                }
                Log.Exception($"[NetModule] Exception: Code: {sessionCode}, SocketError: {socketCode}\n", ex);
            }
        }
        #endregion

        private void InnerConnect(AddressInfo address)
        {
            if (_curRemote != null && _curRemote.Status != SessionStatus.FREE)
            {
                Log.Error($"[NetModule] SessionStatus:{_curRemote.Status}  已连接或者正在连接,又尝试连接");
                return;
            }
            switch (address.ProtocolType)
            {
                case ProtocolType.TCP:
                    _curRemote = _tcpRemote ??= new TCPSession(NetDefine.SESSION_BUFFER_SIZE, NetDefine.SESSION_TIMEOUT, this);
                    break;
                case ProtocolType.WS:
                case ProtocolType.WSS:
#if !UNITY_EDITOR && UNITY_WEBGL
                    _curRemote = new Web.WebSocket(this);
#else
                    _curRemote = _wsRemote ??= new WSSession(NetDefine.SESSION_BUFFER_SIZE, NetDefine.SESSION_TIMEOUT, this);
#endif
                    break;
                default:
                    Log.Error($"[NetModule] 连接失败，协议类型错误{address.ProtocolType}");
                    return;
            }
            Log.Debug($"[NetModule] StartConnect: Type:{address.ProtocolType}, Address:{address.Address}, Port:{address.Port}");
            _curRemote.Connect(address);
        }
        private bool IsConnected => _curRemote != null && _curRemote.Status == SessionStatus.CONNECTED;

    }
}