using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


using Nettention.Proud;


using ServerCore;


namespace ServerBase;


//=============================================================================================
// 패킷 응답/통지 수신 처리자 연결을 위한 AttributeUsage 등록
//
// author : kangms
// 
//=============================================================================================

[AttributeUsage(AttributeTargets.Class)]
public class PacketHandlerAttribute : Attribute
{
    private readonly IPacketCommand m_packet_command;
    private readonly Type m_handler_class;
    private readonly Type m_handlable_owner;
    private readonly bool m_message_hook;

    public PacketHandlerAttribute( Type packetAction, Type command
                                 , Type handlerClass, Type handlerOwner
                                , bool message_hook = false)
    {
        var packet_cmd = new ProudNetPacketCommand(packetAction, command);

        m_packet_command = packet_cmd;
        m_handler_class = handlerClass;
        m_handlable_owner = handlerOwner;
        m_message_hook = message_hook;
    }

    public PacketHandlerAttribute( string exchangeName, Type command
                                 , Type handlerClass, Type handlerOwner)
    {
        var packet_cmd = new RabbitMqPacketCommand(exchangeName, command);

        m_packet_command = packet_cmd;
        m_handler_class = handlerClass;
        m_handlable_owner = handlerOwner;
    }

    public IPacketCommand getPacketCommand()
    {
        return m_packet_command;
    }

    public Type getHandlerClass()
    {
        return m_handler_class;
    }

    public Type getHandlerOwner()
    {
        return m_handlable_owner;
    }

    public bool getMessageHook()
    {
        return m_message_hook;
    }
}

//===========================================================================================
// 패킷 요청 Handler
//
// author : kangms
// 
//===========================================================================================

public abstract class PacketSendHandler
{
    public PacketSendHandler()
    {
    }

    public virtual Result onFillupPacket(Google.Protobuf.IMessage toFillupMessage)
    {
        return new Result();
    }

    public abstract Google.Protobuf.IMessage onGetToSendMessage();
}

//===========================================================================================
// 패킷 수신 Handler
//
// author : kangms
// 
//===========================================================================================

public abstract class PacketRecvHandler
{
    public PacketRecvHandler()
    {
    }

    public virtual async Task<Result> onCheckValid(ISession session, Google.Protobuf.IMessage recvMessage)
    {
        await Task.CompletedTask;
        return new Result();
    }

    public abstract Task<Result> onProcessPacket(ISession session, Google.Protobuf.IMessage recvMessage);

    public virtual async Task onProcessPacketException( ISession session, Google.Protobuf.IMessage recvMessage
                                                      , Result errorResult )
    {
        await Task.CompletedTask;

        Log.getLogger().warn($"Not implemented PacketRecvHandler.onProcessPacketException() !!! : {errorResult?.toBasicString()} - {recvMessage?.toBasicString()}, {session?.toBasicString()}");
    }
}

//===========================================================================================
// 패킷 응답 Handler
//
// author : kangms
// 
//===========================================================================================

public abstract class PacketAckHandler : PacketRecvHandler
{
    public PacketAckHandler()
    {
    }
}

//===========================================================================================
// 패킷 통지 Handler
//
// author : kangms
// 
//===========================================================================================

public abstract class PacketNtfHandler : PacketRecvHandler
{
    public PacketNtfHandler()
    {
    }
}



//===========================================================================================
// p2p 패킷 수신 Handler
//
// author : khlee
// 
//===========================================================================================

public abstract class P2PPacketRecvHandler
{
    public P2PPacketRecvHandler()
    {
        
    }
    public virtual async Task<Result> onCheckValid(ISession session, Google.Protobuf.IMessage recvMessage)
    {
        await Task.CompletedTask;
        return new Result();
    }

    public abstract Task<Result> onProcessP2PPacket(ISession session, ByteArray recvMessage);

    // public virtual async Task onProcessP2PPacketException( ISession session, Google.Protobuf.IMessage recvMessage
    //     , Result errorResult )
    // {
    //     await Task.CompletedTask;
    //
    //     Log.getLogger().warn($"Not implemented PacketRecvHandler.onProcessPacketException() !!! : {errorResult?.toBasicString()} - {recvMessage?.toBasicString()}, {session?.toBasicString()}");
    // }
}