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

using ServerCore;
using ServerBase;
using ServerCommon;


using GameServer.PacketHandler;


using USER_GUID = System.String;


namespace GameServer;

public class ChannelAction : EntityActionBase
{
    public ChannelAction(EntityBase owner) 
        : base(owner)
    {
    }

    public override Task<Result> onInit()
    {
        var result = new Result();

        return Task.FromResult(result);
    }

    public override void onClear()
    {
        return;
    }

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

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

        var server_logic = GameServerApp.getServerLogic();
        var channel_list = server_logic.getChannelManager().getWholeChannels();

        GetChannelListPacketHandler.send_S2C_ACK_GET_CHANNEL_LIST(player, result, channel_list);

        return result;
    }

    public async Task<(Result result, int possible_remaining_time)> tryMoveChannel(int move_channel)  // TODO: chan redis간 transaction 처리가 되어있지 않다.
    {
        var result = new Result();
        var err_msg = string.Empty;

        var player = getOwner() as Player;
        NullReferenceCheckHelper.throwIfNull(player, () => $"player is null !!!");
        
        var server_logic = GameServerApp.getServerLogic();
        var config = server_logic.getServerConfig();

        if (move_channel == config.getChannelNo())
        {
            err_msg = $"Select Same Channel. !!! - {player.toBasicString()}";
            result.setFail(ServerErrorCode.ChannelMoveSameChannel, err_msg);
            Log.getLogger().error(err_msg);
            return (result, 0);
        }

        (result, var serverInfo) = await server_logic.getServerInfoByChannel(config.getWorldId(), move_channel);
        if (serverInfo == null)
        {
            err_msg = $"Failed ValidServerNotFound WorldServerName : {server_logic.getServerName()} move_channel : {move_channel} - {player.toBasicString()}";
            result.setFail(ServerErrorCode.ValidServerNotFound, err_msg);
            Log.getLogger().error(err_msg);
            return (result, 0);
        }

        if (serverInfo.Sessions + serverInfo.Reservation + serverInfo.ReturnCount >= serverInfo.Capacity)
        {
            err_msg = $"Server is Full : {server_logic.getServerName()}, Channel : {move_channel}";
            result.setFail(ServerErrorCode.TargetServerUserCountExceed, err_msg);
            Log.getLogger().error(err_msg);
            return (result, 0);
        }

        // 0. 채널 이동시 조건 체크
        var location_attribute = getOwner().getEntityAttribute<LocationAttribute>();
        NullReferenceCheckHelper.throwIfNull(location_attribute, () => $"location_attribute is null !!!");

        var last_move_time = location_attribute.MoveChannelTime.ToDateTime();
        var possible_remaining_time = last_move_time.AddSeconds(ServerCommon.MetaHelper.GameConfigMeta.ChannelChangeCoolTime) - DateTimeHelper.Current;
        if (possible_remaining_time.TotalSeconds > 0)
        {
            err_msg = $"fail to move channel !!! : invalid channel cool time - {ServerCommon.MetaHelper.GameConfigMeta.ChannelChangeCoolTime} / possible_remaining_time - {possible_remaining_time.TotalSeconds}";
            result.setFail(ServerErrorCode.ChannelInvalidMoveCoolTime, err_msg);
            Log.getLogger().error(result.toBasicString());
            return (result, (int)possible_remaining_time.TotalSeconds);
        }
        
        // 1. 예약 요청
        var message = new ServerMessage.Types.GS2GS_REQ_RESERVATION_ENTER_TO_SERVER();
        message.MoveType = ServerMoveType.Force;
        message.RequestServerName = server_logic.getServerName();
        message.RequestUserGuid = player.getUserGuid();

        var reserved = await server_logic.getReservationManager().registerReservationEnterToServer(message, serverInfo.Name);
        
        // 2. 예약 실패 체크
        if (null == reserved)
        {
            err_msg = $"Failed to reservation enter to game server!!! - {nameof(tryMoveChannel)}";
            Log.getLogger().error(err_msg);
            result.setFail(ServerErrorCode.FailedToReservationEnter, err_msg);
            return (result, 0);
        }
        
        // 3. 이동 처리
        result = await player.runTransactionRunnerSafely(TransactionIdType.PrivateContents, "MoveChannel", moveChannelDelegate);
        if (result.isFail())
        {
            err_msg = $"Failed to runTransaction() !!! : {result.toBasicString()} - {player.toBasicString()}";
            Log.getLogger().error(err_msg);
        }
        
        return (result, 0);
        
        async Task<Result> moveChannelDelegate() => await moveChannelAsync(player, serverInfo);
    }
    
    private async Task<Result> moveChannelAsync(Player player, ServerInfo serverInfo)
    {
        var result = new Result();
        var err_msg = string.Empty;

        var server_logic = GameServerApp.getServerLogic();

        var location_attribute = player.getEntityAttribute<LocationAttribute>();
        NullReferenceCheckHelper.throwIfNull(location_attribute, () => $"location_attribute is null !!! - {player.toBasicString()}");

        location_attribute.MoveChannelTime = DateTimeHelper.Current.ToTimestamp();
        
        result = await GameZoneMoveHelper.moveToAnotherChannel(player, serverInfo, null);
        if (result.isFail())
        {
            err_msg = $"Failed to moveToAnotherChannel() !!! : {result.toBasicString()}";
            Log.getLogger().error(err_msg);

            return result;
        }

        var account_attribute = player.getEntityAttribute<AccountAttribute>();
        NullReferenceCheckHelper.throwIfNull(account_attribute, () => $"account attribute is null !!! - {player.toBasicString()}");

        var gameServer_connection_info = new ServerConnectInfo
        {
            ServerAddr = serverInfo.Address,
            ServerPort = serverInfo.Port,
            Otp = account_attribute.OtpForServerConnect,
        };

        var batch = new QueryBatchEx<QueryRunnerWithDocument>(player, LogActionType.None, server_logic.getDynamoDbClient());
        {
            batch.addQuery(new DBQWriteToAttributeAllWithTransactionRunner());
            batch.addQuery(new QueryFinal());
        }

        result = await QueryHelper.sendQueryAndBusinessLog(batch);
        if (result.isFail())
        {
            err_msg = $"Failed to runTransactionRunnerSafely()!!! : {result.toBasicString()} - {player.toBasicString()}";
            Log.getLogger().error(err_msg);
            return result;
        }

        MoveChannelPacketHandler.send_S2C_ACK_MOVE_CHANNEL(player, result, gameServer_connection_info, 0);
        return result;
    }
}