//////////////////////////////////////////////////////////////////////////
// 
// 文件：Assets/Code/Scripts/Gameplay/Net/Client/NetClient.cs
// 作者：Xoen Xie
// 时间：2023/07/18
// 描述：网络客户端
// 说明：
//
//////////////////////////////////////////////////////////////////////////
using UnityEngine;
using Framework;
using System;

namespace Gameplay.Net
{
    public sealed class NetClient : INetHandler
    {
        private string m_sIP;
        private int m_nPort;

        private NetTcp m_Connection;
        private NetReader m_Reader;

        public bool m_bHandshake;

        private float m_fLastHeartbeatTime = 0;

        public uint mID;

        private DH64 m_dh64;

        private ulong m_nPrivateKey;
        private ulong m_nPublicKey;

        public NetClient()
        {
            m_Reader = new NetReader();

            m_Connection = new NetTcp();

            byte[] data = BitConverter.GetBytes((ulong)1234567890);
            m_Connection.Cipher = new RC4Cipher(data);

            m_dh64 = new DH64();
            m_dh64.KeyPair(out m_nPrivateKey, out m_nPublicKey);
        }

        public bool Create(string sIP, int nPort)
        {
            m_sIP = sIP;
            m_nPort = nPort;

            m_Connection.Create(this);

            m_bHandshake = false;

            m_fLastHeartbeatTime = 0;

            return true;
        }

        public void Release()
        {
            m_Connection.Release();

            m_bHandshake = false;
        }

        public void DisConnect()
        {
            m_Connection.DisConnect();
        }

        public bool Connect()
        {
            if (!m_Connection.Connect(m_sIP, m_nPort))
            {
                return false;
            }

            Framework.EventManager.Instance.Send(Framework.EventManager.EventName.NetConnecting, mID);

            return true;
        }

        public void SendMessage(IMessage message, uint nRawID = 0)
        {
            if (m_Connection == null || !m_Connection.mIsConnected)
            {
                DebugUtil.LogError("NetClient.SendMessage connection not connected, msg id={0}", message.ID);
                return;
            }

            m_Connection.Send((ushort)message.ID, message.Export(), nRawID);
        }

        public void Update()
        {
            m_Connection.Dispath();

            if (!m_Connection.mIsConnected)
                return;

            if (m_bHandshake)
            {
                float fCurTime = Time.realtimeSinceStartup;
                if (fCurTime >= Constants.HEARTBEAT_INTERVAL + m_fLastHeartbeatTime)
                {
                    m_fLastHeartbeatTime = fCurTime;
                    SendHeartbeat();
                }
            }
        }

        public void OnConnected()
        {
            Framework.EventManager.Instance.Send(Framework.EventManager.EventName.NetConnected, mID);

            DebugUtil.Log("NetClient::OnConnected ip={0}, port={1}", m_sIP, m_nPort);

            // 连接成功发送握手消息
            SendHandshake();
            m_fLastHeartbeatTime = 0;
        }

        public void OnRecv(byte[] data)
        {
            m_Reader.Init(data);
            ushort nMsgID = 0;

            m_Reader.ReadUShort(out nMsgID);

            //减少心跳包的Log
            if ((NLDMID.MSGID)nMsgID != NLDMID.MSGID.GtCltHeartbeat)
            {
                DebugUtil.Log("NetClient OnRecv, msg id={0}", (NLDMID.MSGID)nMsgID);
            }

            IMessage message = NetManager.Instance.GetMessage((NLDMID.MSGID)nMsgID);
            if (message != null)
            {
                message.Import(data, 2, data.Length - 2);
                message.Execute(this);
            }
            else
            {
                DebugUtil.LogError("NetClient OnRecv message not found, msg id={0}", (NLDMID.MSGID)nMsgID);
            }
            
        }

        public void OnError(NetError nErrorCode)
        {
            DebugUtil.LogError("NetClient::OnError, 网络出错，错误码={0}", nErrorCode);

            Framework.EventManager.Instance.Send(Framework.EventManager.EventName.NetError, mID);
        }




        private void SendHandshake()
        {
            var msg = NetManager.Instance.GetMessage(NLDMID.MSGID.CltGtHandshake) as MSG_Clt_Gt_Handshake;
            msg.mPB.ClientPublicKey = m_nPublicKey;
            SendMessage(NetManager.Instance.GetMessage(NLDMID.MSGID.CltGtHandshake));
        }

        public void SendHeartbeat()
        {
            MSG_Clt_Gt_Heartbeat msg = NetManager.Instance.GetMessage(NLDMID.MSGID.CltGtHeartbeat) as MSG_Clt_Gt_Heartbeat;
            msg.mPB.Time = PhxhSDK.Utils.GetTimeStampMilliseconds();
            SendMessage(msg);
        }

        public void OnHandshake(ulong nServerPublicKey)
        {
            var secret = m_dh64.Secret(m_nPrivateKey, nServerPublicKey);
            byte[] data = BitConverter.GetBytes(secret);
            m_Connection.Cipher = new RC4Cipher(data);

            DebugUtil.Log("NetClient.OnHandshake start ...");
            Framework.EventManager.Instance.Send(Framework.EventManager.EventName.NetHandshakeDone, mID);
            m_bHandshake = true;
        }

    }
}