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


using ServerCore;
using ServerBase;
using ServerCommon;


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



namespace GameServer.PacketHandler;


[PacketHandler(typeof(ClientToGameReq), typeof(ClientToGameReq.Types.MoveChannelReq), typeof(MoveChannelPacketHandler), typeof(GameLoginListener))]
public class MoveChannelPacketHandler : PacketRecvHandler
{
    public static bool send_S2C_ACK_MOVE_CHANNEL(Player player, Result result, ServerConnectInfo? serverConnectInfo, int possibleRemainingTime)
    {
        var ack_packet = new ClientToGame();
        ack_packet.Response = new ClientToGameRes();

        ack_packet.Response.ErrorCode = result.ErrorCode;
        ack_packet.Response.MoveChannelRes = new MoveChannelRes();
        ack_packet.Response.MoveChannelRes.PossibleRemainingTime = possibleRemainingTime;

        if(serverConnectInfo != null)
        {
            ack_packet.Response.MoveChannelRes.GameServerConnectInfo = serverConnectInfo;
        }

        if (false == GameServerApp.getServerLogic().onSendPacket(player, ack_packet))
        {
            return false;
        }

        return true;
    }

    public override async Task<Result> onProcessPacket(ISession entityWithSession, IMessage recvMessage)
    {
        var player = entityWithSession as Player;
        NullReferenceCheckHelper.throwIfNull(player, () => $"player is null !!!");

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

        var result = new Result();
        var err_msg = string.Empty;

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

        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_MOVE_CHANNEL(player, result, null, 0);
            return result;
        }

        var character_action = selected_character.getEntityAction<CharacterAction>();
        NullReferenceCheckHelper.throwIfNull(character_action, () => $"character_action is null !!! - {selected_character.toBasicString()}");
        if (character_action.isFarming())
        {
            err_msg = $"Character is Farming !!! - {selected_character.toBasicString()}, {player.toBasicString()}";
            result.setFail(ServerErrorCode.FarimgState, err_msg);
            Log.getLogger().error(result.toBasicString());

            send_S2C_ACK_MOVE_CHANNEL(player, result, null, 0);
            return result;
        }

        var channel_action = player.getEntityAction<ChannelAction>();
        NullReferenceCheckHelper.throwIfNull(channel_action, () => $"channel_action is null !!! - {player.toBasicString()}");
        
        (result, var possible_remaining_time) = await channel_action.tryMoveChannel(request.Channel);
        if (result.isFail())
        {
            err_msg = $"Failed to tryMoveChannel() !!! : {result.toBasicString()} - {player.toBasicString()}";
            Log.getLogger().error(err_msg);

            send_S2C_ACK_MOVE_CHANNEL(player, result, null, possible_remaining_time);
            return result;
        }

        return 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_MOVE_CHANNEL(player, errorResult, null, 0);
    }
}