using System;
using System.Net;
using System.Net.Sockets;

namespace BF
{
    internal partial class TCPChannel : INetChannel
    {
        private readonly NetChannelMessageService messageService;
        private readonly TCPConnection ownerConnection;

        /// <summary>
        /// internal actual status
        /// </summary>
        private NetConnectStatus actualStatus;

        /// <summary>
        /// visible connect status
        /// </summary>
        private NetConnectStatus visibleStatus;
        private bool decoding = false;

        public NetConnectStatus ConnectStatus
        {
            get
            {
                return connectContext == NetConnectContext.Reconnect ? NetConnectStatus.Reconnecting : visibleStatus;
            }
        }

        /// <summary>
        /// 最近一个心跳包同步的服务器当前时间戳 ms
        /// </summary>
        public long ServerTimestamp => serverTimestamp;

        public TCPChannel(TCPConnection ownerConnection, IPEndPoint endPoint)
        {
            this.ownerConnection = ownerConnection;
            messageService = new NetChannelMessageService();

            InitializeReceive();
            InitializeSend();
            InitializeConnect(endPoint);
            InitializeHeartBeat();
            InitializeReconnect();

#if BF_DEBUG
            NetStatistics.RegisterConnect(ownerConnection.UniqueIdentifier,
                o =>
            {
                if (o is NetOutgoingMessage tempMessage)
                {
                    sendMessageQueue.Enqueue(tempMessage);
                }
            },
                o =>
            {
                if (o is NetIncomingMessage tempMessage)
                {
                    receiveMessageQueue.Enqueue(tempMessage);
                }
            });
#endif
        }

        public void Update()
        {
            if (visibleStatus == NetConnectStatus.Unconnected)
            {
                return;
            }

            // BFLog.Log("visibleStatus = " + visibleStatus);
            if (visibleStatus == NetConnectStatus.Decoding && !decoding)
            {
                if(ownerConnection.UniqueIdentifier.CompareTo(BF.NetManager.MAIN_SOCKET_NAME) == 0)
                {
                    bool decodeFinish = BF.BFMain.Instance.NetMgr.GetDecodeStataus();
                    if (decodeFinish)
                    {
                        uint group = BF.BFMain.Instance.NetMgr.GetDecodeGroup();
                        if (group == Auth_Rsp_Group)
                        {
                            decoding = true;
                            FilterAuthIncomingMessage2();
                            return;
                        }
                    }
                }
                else
                {
                    bool decodeFinish = BF.BFMain.Instance.NetMgr.GetDecodeChatStataus();
                    if (decodeFinish)
                    {
                        uint group = BF.BFMain.Instance.NetMgr.GetDecodeChatGroup();
                        if (group == Chat_Auth_Rsp_Group)
                        {
                            decoding = true;
                            FilterAuthIncomingMessage2();
                            return;
                        }
                    }
                }
            }
            // BFLog.Log("visibleStatus = " + visibleStatus + "decoding = " + decoding);
            if (visibleStatus == NetConnectStatus.Decoding2 && !decoding)
            {
                if(ownerConnection.UniqueIdentifier.CompareTo(BF.NetManager.MAIN_SOCKET_NAME) == 0)
                {
                    bool decodeFinish = BF.BFMain.Instance.NetMgr.GetDecodeStataus();
                    if (decodeFinish)
                    {
                        uint group = BF.BFMain.Instance.NetMgr.GetDecodeGroup();
                        if (group == Reconnect_Rsp_Group)
                        {
                            decoding = true;
                            FilterReconnectIncomingMessage2();
                            return;
                        }
                    }
                }
                else
                {
                    bool decodeFinish = BF.BFMain.Instance.NetMgr.GetDecodeChatStataus();
                    if (decodeFinish)
                    {
                        uint group = BF.BFMain.Instance.NetMgr.GetDecodeChatGroup();
                        if (group == Reconnect_Rsp_Group)
                        {
                            decoding = true;
                            FilterReconnectIncomingMessage2();
                            return;
                        }
                    }
                }
            }

            try
            {
                SendUpdate();
                ReceiveUpdate();
                HeartBeat();
                // UpdateTimer();
                // UpdateSmartReconnect();
            }
            catch (Exception e)
            {
                LogError(NetErrorCode.ExceptionError, $"Channel update throw exception : {e}");
            }
        }

        public void Reconnect()
        {
            if (actualStatus != NetConnectStatus.Disconnected
                && actualStatus != NetConnectStatus.Connected)
            {
                return;
            }

            internalReconnectFlag = false;

            LogDebug($"Begin force reconnect : {tryReconnectCount}");

            PrepareReconnect();

            TryConnectNewConnect();
        }

        public void Connect(IPAddress ipAddress, int port)
        {
            ConnectInternalAsync();
        }

        public void Close()
        {
#if BF_DEBUG
            NetStatistics.UnRegisterConnect(ownerConnection.UniqueIdentifier);
#endif

            Disconnect();

            waitingSendMessagesQueue.Clear();
            alreadySendMessagesQueue.Clear();
            alreadySendExchangeStack.Clear();
            serverDisconnectMessageQueue.Clear();

            ClearSendReceiveMessageQueue();

            SetConnectContext(NetConnectContext.Invalid);
            SetActualStatus(NetConnectStatus.Unconnected);
            SetVisibleStatus(NetConnectStatus.Unconnected);

            receiveBuffer.Dispose();
            sendStream.Dispose();
        }

        public NetSendResult Send(INetOutgoingMessage message)
        {
            var result = SendInternal((NetOutgoingMessage)message);
            return result;
        }

        public NetSendResult Send(uint group, byte cmd, byte[] data)
        {
            var outgoingMessage = ownerConnection.CreateOutgoingMessage(NetOutgoingMessageType.UserData);
            outgoingMessage.Encode(group, cmd, data);
            var result = SendInternal(outgoingMessage);
            return result;
        }

        public INetIncomingMessage ReadMessage()
        {
            NetIncomingMessage message = null;
            releasedIncomingMessage.TryDequeue(out message);
            return message;
        }
    }
}