using Google.Protobuf;
using Google.Protobuf.WellKnownTypes;

using ServerCore;
using ServerBase;
using ServerCommon;

using static ClientToGameReq.Types;
using static ClientToGameRes.Types;

using META_ID = System.UInt32;


namespace GameServer.PacketHandler;

[PacketHandler(typeof(ClientToGameReq), typeof(ClientToGameReq.Types.StartBuffReq), typeof(StartBuffPacketHandler), typeof(GameLoginListener))]
public class StartBuffPacketHandler : PacketRecvHandler
{
    public static bool send_S2C_ACK_START_BUFF(Player player, Result result)
    {
        var ack_packet = new ClientToGame();
        ack_packet.Response = new ClientToGameRes();

        ack_packet.Response.ErrorCode = result.ErrorCode;
        ack_packet.Response.StartBuffRes = new StartBuffRes();
        
        if (false == GameServerApp.getServerLogic().onSendPacket(player, ack_packet))
        {
            return false;
        }

        return true;
    }

    public override Task<Result> onProcessPacket(ISession entityWithSession, IMessage recvMessage)
    {
        var result = new Result();
        var err_msg = string.Empty;

        var player = entityWithSession as Player;
        ArgumentNullReferenceCheckHelper.throwIfNull(player, () => $"player is null !!!");
        var game_msg = recvMessage as ClientToGame;
        ArgumentNullReferenceCheckHelper.throwIfNull(game_msg, () => $"game_msg is null !!! - {player.toBasicString()}");
        var request = game_msg.Request.StartBuffReq;
        ArgumentNullReferenceCheckHelper.throwIfNull(request, () => $"request is null !!! - {player.toBasicString()}");


        var player_action = player.getEntityAction<PlayerAction>();
        NullReferenceCheckHelper.throwIfNull(player_action, () => $"player_action is null !!! - {player.toBasicString()}");

        // 1. 캐릭터 선택 상태 체크
        var selected_character = player_action.getSelectedCharacter();
        if (null == selected_character)
        {
            err_msg = $"Not selected Character !!! - {player.toBasicString()}";
            result.setFail(ServerErrorCode.CharacterNotSelected, err_msg);
            Log.getLogger().error(result.toBasicString());

            send_S2C_ACK_START_BUFF(player, result);
            return Task.FromResult(result);
        }

        var buff_action = player.getEntityAction<BuffAction>();
        NullReferenceCheckHelper.throwIfNull(buff_action, () => $"buff_action is null !!! - {player.toBasicString()}");

        (result, var add_buff_attribute, var del_buff_attribute) = buff_action.AddBuffProcess((META_ID)request.BuffId);
        if (result.isFail())
        {
            err_msg = $"Failed to AddBuffProcess() !!! : {result.toBasicString()} - {player.toBasicString()}";
            Log.getLogger().error(err_msg);
            send_S2C_ACK_START_BUFF(player, result);

            return Task.FromResult(result);
        }

        send_S2C_ACK_START_BUFF(player, result);

        BuffNotifyHelper.send_S2C_NTF_DELETE_BUFF(player, del_buff_attribute);
        BuffNotifyHelper.send_S2C_NTF_START_BUFF(player, add_buff_attribute);

        return Task.FromResult(result);
    }

    public override async Task onProcessPacketException(ISession entityWithSession, IMessage recvMessage
                                               , Result errorResult)
    {
        await Task.CompletedTask;

        var player = entityWithSession as Player;
        NullReferenceCheckHelper.throwIfNull(player, () => $"player is null !!! - {entityWithSession.toBasicString()}");

        send_S2C_ACK_START_BUFF(player, errorResult);
    }
}