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


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


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


namespace GameServer.PacketHandler;

[PacketHandler(typeof(ClientToGameReq), typeof(ClientToGameReq.Types.LeaveInstanceReq), typeof(LeaveInstancePacketHandler), typeof(GameLoginListener))]
internal class LeaveInstancePacketHandler : PacketRecvHandler
{
    public static bool send_S2C_ACK_LEAVE_INSTANCE(Player owner, Result result, ServerConnectInfo? server_info)
    {
        var ack_packet = new ClientToGame();
        ack_packet.Response = new ClientToGameRes();

        ack_packet.Response.ErrorCode = result.ErrorCode;
        ack_packet.Response.LeaveInstanceRes = new LeaveInstanceRes();

        if (result.isSuccess() && null != server_info)
        {
            ack_packet.Response.LeaveInstanceRes.GameServerAddr = server_info.ServerAddr;
            ack_packet.Response.LeaveInstanceRes.GameServerPort = server_info.ServerPort;
            ack_packet.Response.LeaveInstanceRes.Otp = server_info.Otp;
        }

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

        return true;
    }

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

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

        var server_logic = GameServerApp.getServerLogic();
        
        var req_msg = recvMessage as ClientToGame;
        ArgumentNullReferenceCheckHelper.throwIfNull(req_msg, () => $"req_msg is null !!! - {entity_player.toBasicString()}");

        var request = req_msg.Request.LeaveInstanceReq;
        if (null == request)
        {
            err_msg = $"failed to get request message : Invalid Request message - {req_msg.Request.MsgCase}";
            Log.getLogger().error(err_msg);
            result.setFail(ServerErrorCode.InvalidArgument, err_msg);
            return result;
        }
        
        //battle instance 인 경우 해당 패킷 사용 못하게 예러 처리(치트로 나가는 유저들이 있어서 임시로 막는다.)
        if (BattleInstanceManager.It.isBattleInstance(entity_player))
        {
            err_msg = $"LeaveInstanceReq not use in battle instance entity_player : {entity_player.toBasicString()}";
            Log.getLogger().error(err_msg);
            result.setFail(ServerErrorCode.FailedToReservationEnter, err_msg);
            
            send_S2C_ACK_LEAVE_INSTANCE(entity_player, result, null);
            return result;
        }
        

        var location_action = entity_player.getEntityAction<LocationAction>();
        NullReferenceCheckHelper.throwIfNull(location_action, () => $"LocationAction is null !!! - player:{entity_player.toBasicString()}");

        bool prev_is_in_concert = location_action.isInConcert();
        var attribute = entity_player.getEntityAttribute<LocationAttribute>();
        NullReferenceCheckHelper.throwIfNull(attribute, () => $"LocationAttribute is null !!! - player:{entity_player.toBasicString()}");

        if (false == MetaData.Instance._IndunTable.TryGetValue(attribute.CurrentIndunLocation.InstanceMetaId, out var prev_indun_data) || null == prev_indun_data)
        {
            err_msg = $"failed to get indun data !!! - {entity_player.toBasicString()}";
            result.setFail(ServerErrorCode.NotFoundIndunData, err_msg);
            Log.getLogger().error(err_msg);
            return result;
        }
        
        // 1. 이동할 서버 조회
        var move_server_info = await searchMoveToChannelServer(entity_player);
        if (null == move_server_info)
        {
            err_msg = $"Failed to get balanced GameServer !!! - {entity_player.toBasicString()}";
            result.setFail(ServerErrorCode.NoServerConnectable, err_msg);
            Log.getLogger().error(err_msg);
            return result;
        }
        
        // 2. 이동 예약 요청
        var message = new ServerMessage.Types.GS2GS_REQ_RESERVATION_ENTER_TO_SERVER();
        message.MoveType = ServerMoveType.Force;
        message.RequestUserGuid = entity_player.getUserGuid();
        message.RequestServerName = GameServerApp.getServerLogic().getServerName();

        var reserved = await server_logic.getReservationManager().registerReservationEnterToServer(message, move_server_info.Name);
        
        // 예약 실패 체크
        if (null == reserved)
        {
            err_msg = $"Failed to reservation enter to game server!!! - {nameof(LeaveInstancePacketHandler)}";
            Log.getLogger().error(err_msg);
            result.setFail(ServerErrorCode.FailedToReservationEnter, err_msg);
            
            send_S2C_ACK_LEAVE_INSTANCE(entity_player, result, null);
            return result;
        }

        // 4. instance room 떠나기
        result = await entity_player.runTransactionRunnerSafely(TransactionIdType.PrivateContents, "LeaveInstance", leaveInstanceDelegate);
        if (result.isFail())
        {
            err_msg = $"Failed to runTransactionRunner() !!! : {result.toBasicString()} - {entity_player.toBasicString()}";
            Log.getLogger().error(err_msg);
        }

        
        // if (prev_is_in_concert && prev_indun_data is not null)
        // {
        //     await QuestManager.It.QuestCheck(entity_player, new QuestConcert(EQuestEventTargetType.CONCERT, EQuestEventNameType.ENDED, prev_indun_data.MapId));
        // }


        return result;
        
        async Task<Result> leaveInstanceDelegate() => await leaveInstanceAsync(entity_player, move_server_info, prev_is_in_concert, prev_indun_data);
    }

    public async Task<Result> leaveInstanceAsync(Player player, ServerInfo server_info, bool prevIsInConcert, InstanceMetaData prevIndunData)
    {
        var server_logic = GameServerApp.getServerLogic();
        
        var game_zone_action = player.getEntityAction<GameZoneAction>();
        NullReferenceCheckHelper.throwIfNull(game_zone_action, () => $"game_zone_action is null !!! - {player.toBasicString()}");
        
        var result = new Result();
        string err_msg;

        // 1. leave room
        (result, _) = await game_zone_action.tryLeaveInstanceRoom();
        if (result.isFail())
        {
            err_msg = $"Failed to tryLeaveInstance() !!! : {result.toBasicString()} - {player.toBasicString()}";
            Log.getLogger().error(err_msg);

            send_S2C_ACK_LEAVE_INSTANCE(player, result, null);
            return result;
        }

        var location_action = player.getEntityAction<LocationAction>();

        // 2. move to channel
        result = await location_action.tryMoveToChannel();
        if (result.isFail())
        {
            err_msg = $"Fail to tryMoveToIndun";
            Log.getLogger().error(err_msg);

            send_S2C_ACK_LEAVE_INSTANCE(player, result, null);
            return result;
        }

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

        result = await buff_action.MoveServer(EPlaceType.World);
        if (result.isFail())
        {
            send_S2C_ACK_LEAVE_INSTANCE(player, result, null);
            return result;
        }

        // 3. otp 생성
        (result, var reserved_to_switch_server) = await ServerConnectionSwitchHelper.startServerSwitch(player, server_logic.getRedisConnector(), server_info.Name);
        if (result.isFail() || null == reserved_to_switch_server)
        {
            err_msg = $"Fail to startServerSwitch() !!! : {result.toBasicString()}";
            Log.getLogger().error(result.toBasicString());

            send_S2C_ACK_LEAVE_INSTANCE(player, result, null);
            return result;
        }

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

        var login_cache = game_login_action.getLoginCacheRequest()?.getLoginCache();
        NullReferenceCheckHelper.throwIfNull(login_cache, () => $"LoginCache is null !!! - player:{player.toBasicString()}");

        login_cache.ReservedToSwitchServer = reserved_to_switch_server;
        
        var gameServer_connection_info = new ServerConnectInfo
        {
            ServerAddr = server_info.Address,
            ServerPort = server_info.Port,
            Otp = reserved_to_switch_server.OneTimeKey,
        };
        
        var batch = new QueryBatchEx<QueryRunnerWithDocument>(player, LogActionType.None, server_logic.getDynamoDbClient());
        {
            batch.addQuery(new DBQWriteToAttributeAllWithTransactionRunner());
            batch.addQuery(new QueryFinal());
        }

        if (prevIsInConcert && prevIndunData is not null)
        {
            await QuestManager.It.QuestCheckWithoutTransaction(player, new QuestConcert(EQuestEventTargetType.CONCERT, EQuestEventNameType.ENDED, prevIndunData.MapId));
        }
        
        result = await QueryHelper.sendQueryAndBusinessLog(batch);
        if (result.isFail())
        {
            err_msg = $"Failed to runTransactionRunnerSafely() !!! : {result.toBasicString()} - {player.toBasicString()}";
            Log.getLogger().error(err_msg);

            send_S2C_ACK_LEAVE_INSTANCE(player, result, null);
            return result;            
        }
        
        send_S2C_ACK_LEAVE_INSTANCE(player, result, gameServer_connection_info);
        return result;
    }

    private async Task<ServerInfo?> searchMoveToChannelServer(Player player)
    {
        var server_logic = GameServerApp.getServerLogic();
        
        var location_attribute = player.getEntityAttribute<LocationAttribute>();
        NullReferenceCheckHelper.throwIfNull(location_attribute, () => $"location_attribute is null !!! - {player.toBasicString()}");

        var channel_server_name = location_attribute.LastestChannelServerLocation.ServerName;
        var world_meta_id = location_attribute.LastestChannelServerLocation.WorldMetaId;

        var server_info = await server_logic.getReturnToServerInfo(channel_server_name, ServerType.Channel, player, (ushort)world_meta_id);

        return server_info;
    }
}