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


using ServerCore;
using ServerBase;
using ServerCommon;
using ServerCommon.BusinessLogDomain;
using MetaAssets;



namespace GameServer.PacketHandler;

[PacketHandler(typeof(ClientToGameReq), typeof(ClientToGameReq.Types.C2GS_REQ_CHANGE_SCREEN_PAGE), typeof(ChangeScreenPagePacketHandler), typeof(GameLoginListener))]
public class ChangeScreenPagePacketHandler : PacketRecvHandler
{
    public static void send_S2C_ACK_CHANGE_SCREEN_PAGE(Player? owner, Result result, int screenPageNo)
    {
        var ack_packet = new ClientToGame
        {
            Response = new ClientToGameRes
            {
                ErrorCode = result.ErrorCode,
                AckChangeScreenPage = new ClientToGameRes.Types.GS2C_ACK_CHANGE_SCREEN_PAGE
                {
                    ScreenPageNo = screenPageNo
                }
            }
        };
        
        GameServerApp.getServerLogic().onSendPacket(owner!, ack_packet);
    }
    
    public override async Task<Result> onProcessPacket(ISession entityWithSession, IMessage recvMessage)
    {
        await Task.CompletedTask;

        var result = new Result();
        string err_msg;

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

        // 1. 기본 정보 체크
        var request = (recvMessage as ClientToGame)?.Request.ReqChangeScreenPage;
        if (null == request)
        {
            err_msg = $"Failed to get request type !!! : {nameof(ClientToGame.Request.ReqChangeScreenPage)}";
            result.setFail(ServerErrorCode.InvalidArgument, err_msg);
            Log.getLogger().error(result.toBasicString());

            send_S2C_ACK_CHANGE_SCREEN_PAGE(player, result, -1);
            return result;
        }

        // 2. room id 확인
        (result, var room_id) = checkCondition(player, request);
        if (result.ErrorCode != ServerErrorCode.Success)
        {
            send_S2C_ACK_CHANGE_SCREEN_PAGE(player, result, -1);
            return result;
        }
        
        // 3. room screen page 수정
        var screen_page = InstanceRoomManager.Instance.changeScreenPage(room_id, request.IsCustom == BoolType.True, request.IsIncrease == BoolType.True, request.CustomPage);
        if (screen_page < 0)
        {
            err_msg = $"failed to change screen page!! : roomId[{room_id}]";
            result.setFail(ServerErrorCode.NotExistInstanceRoom, err_msg);
            Log.getLogger().error(err_msg);
        }
        
        send_S2C_ACK_CHANGE_SCREEN_PAGE(player, result, screen_page);
        return await Task.FromResult(result);
    }

    private (Result result, string room_id) checkCondition(Player player, ClientToGameReq.Types.C2GS_REQ_CHANGE_SCREEN_PAGE request)
    {
        var result = new Result();
        string err_msg;
        
        var location = player.getEntityAttribute<LocationAttribute>();
        NullReferenceCheckHelper.throwIfNull(location, () => $"location is null !!!");

        // 1. room id 체크
        var room_id = location.CurrentIndunLocation.InstanceRoomId;
        if (string.IsNullOrEmpty(room_id))
        {
            err_msg = "Failed to change screen page!! : user is not in room";
            result.setFail(ServerErrorCode.InvalidArgument, err_msg);
            Log.getLogger().error(result.toBasicString());

            send_S2C_ACK_CHANGE_SCREEN_PAGE(player, result, -1);
            return (result, string.Empty);
        }
        
        // 2. 매개변수 체크
        if (request.IsCustom == BoolType.True && request.CustomPage < 0)
        {
            err_msg = $"Failed to change screen page!! : invalid custom page number - {request.CustomPage}";
            result.setFail(ServerErrorCode.InvalidArgument, err_msg);
            Log.getLogger().error(result.toBasicString());

            send_S2C_ACK_CHANGE_SCREEN_PAGE(player, result, -1);
            return (result, string.Empty);
        }

        return (result, room_id);
    }
}