using System;
using XGame.Framework.Interfaces;

namespace XGame.Framework.Network
{
    internal class MsgSender : IMsgSender, IReset
    {
        private ISessionContext _context;
        private int seqID = -1;
        /// <summary>
        /// 消息间隔，默认3秒
        /// </summary>
        private const int _interval = 3000;
        private long _lastTime = 0;
        private int _lastID = -1;
        public MsgSender(ISessionContext context)
        {
            _context = context;
        }

        public bool IsCanSend(IMessage message, bool useFilter)
        {
            if (useFilter)
            {
                var nowTime = _context.Time.GetNowTime();
                if (_lastTime == 0 || nowTime - _lastTime > _interval)
                { // 没记录时间 或 已经超时, 刷新时间
                    _lastTime = nowTime;
                }
                else
                {
                    return false;
                }
            }
            message.InstanceID = ++seqID;
            if (useFilter)
            {
                _lastID = message.InstanceID;
            }
            return true;
        }
        //|<-			     	 Head  	 	                             ->|<-      Body      ->|	
        //| magic |  type | compress | encryption |0000|  seqID   | protoId| msglength|   msg   |
        //| 1byte |  2bit |   1bit   | 1bit       |4bit|  4byte   | 4byte  |  2byte   |  Nbyte  |
        //|   0   |           1                        | 2 3 4 5  | 6789   |  10  11  |         | 
        public ESessionCode Send(IMessage message, bool openEncrypt)
        {
            _context.Serializer.Write(message, out var bytes, out var msgOffset, out var msgLength);
            //magic
            bytes[0] = NetDefine.MAGIC;
            //type compress
            int type = (int)MsgType.REQUEST << 6;
            bool isCompress = (msgLength + NetDefine.HEAD_LENGTH_REQUEST) > NetDefine.CompressThreshold;
            int compress = (isCompress ? 1 : 0) << 5;
            int encryption = (openEncrypt ? 1 : 0) << 4;
            bytes[1] = Convert.ToByte((compress + type + encryption) & 0xFF);

            //seqID
            bytes[2] = Convert.ToByte(message.InstanceID >> 24 & 0xFF);
            bytes[3] = Convert.ToByte(message.InstanceID >> 16 & 0xFF);
            bytes[4] = Convert.ToByte(message.InstanceID >> 8 & 0xFF);
            bytes[5] = Convert.ToByte(message.InstanceID & 0xFF);

            //protoID
            bytes[6] = Convert.ToByte(message.ProtocolID >> 24 & 0xFF);
            bytes[7] = Convert.ToByte(message.ProtocolID >> 16 & 0xFF);
            bytes[8] = Convert.ToByte(message.ProtocolID >> 8 & 0xFF);
            bytes[9] = Convert.ToByte(message.ProtocolID & 0xFF);

            if (isCompress)
            {
                _context.Compressor.Compress(ref bytes, ref msgOffset, ref msgLength);

            }
            if (openEncrypt)//rc4的话 用新数组进行保存
            {
                _context.Encryptor.Encrypt(ref bytes, ref msgOffset, ref msgLength);
            }
            //msglengh
            bytes[10] = Convert.ToByte(msgLength >> 8 & 0xFF);
            bytes[11] = Convert.ToByte(msgLength & 0xFF);
            NetLog.LogHexString($"发送消息", bytes, 0, msgLength + NetDefine.HEAD_LENGTH_REQUEST);
            var result = _context.Session.Send(bytes, 0, msgLength + NetDefine.HEAD_LENGTH_REQUEST);
            return result ? ESessionCode.None : ESessionCode.SendFailed;
        }

        public void Reset()
        {
            seqID = -1;
            _lastID = -1;
            _lastTime = 0;
        }

        public bool VerifyInstanceID(int instanceID)
        {
            if (_lastID == instanceID)
            {
                _lastTime = 0;
                return true;
            }
            return false;
        }

        //private bool CanSendMsg(IMessage msg)
        //{
        //    if (!_sessionNode.MsgContext.CanSend)//false request 和 response 没有对应
        //    {
        //        Log.Debug(string.Format("[Session Send Filter] <{0}> {1} lastSeq: {2} \n消息发送过快，上条消息尚未回复导致消息被过滤，请重发或使用INetModule.Send(string sessionType, IMessage msg, bool isFilter),isFilter设置为false\n{3}", msg.ProtocolID, msg.GetType().Name, _sessionNode.MsgContext.LastID, XJson.ToJson(msg)));
        //        var args = ObjectPool.Acquire<SessionMsgFilterEventArgs>();
        //        args.Message = msg;
        //        _sessionNode.Notify(EventDefine.SESSION_MSG_FILTER, args);
        //        ObjectPool.Recycle(args);
        //        return false;
        //    }
        //    _sessionNode.MsgContext.CanSend = false;
        //    //计时开始
        //    _timer?.Cancel();
        //    _timer = _timeModule.AddDelayTimer(_interval, Timeout);
        //    return true;
        //}


        //private void DebugMessage(IMessage message)
        //{
        //    if (_sessionNode.bDebug)
        //    {
        //        Log.Info("[Session] Send <{1}> {2}: Seq:{4} Timestamp:{0}\n{3}",
        //            _timeModule.GetNowTime(ClockType.Client), message.ProtocolID, message.GetType().Name, XJson.ToJson(message), message.InstanceID);
        //    }
        //}
        //private void SendFail(IMessage message)
        //{

        //    var args = ObjectPool.Acquire<SessionCantSendEventEventArgs>();
        //    args.message = message;
        //    if (_sessionNode.bDebug)
        //    {
        //        Log.Error("[Session Send Fail] Send <{1}> {2}: Timestamp:{0}\n{3}",
        //            _timeModule.GetNowTime(ClockType.Client), message.ProtocolID, message.GetType().Name, XJson.ToJson(message));
        //    }
        //    _sessionNode.Notify(EventDefine.SESSION_CANT_SEND, args);
        //    ObjectPool.Recycle(args);
        //}

        //private void SendEvent(IMessage msg, bool isFilter)
        //{
        //    var args = ObjectPool.Acquire<SessionRequestSentEventArgs>();
        //    args.protocolID = msg.ProtocolID;
        //    args.context = msg.Context;
        //    args.IsFilter = isFilter;
        //    args.RequestMsg = msg;
        //    args.seq = msg.InstanceID;
        //    _sessionNode.Notify(EventDefine.SESSION_REQUEST_SENT, args);
        //    ObjectPool.Recycle(args);
        //}
    }
}