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.GetChannelListReq), typeof(GetChannelListPacketHandler), typeof(GameLoginListener))]
public class GetChannelListPacketHandler : PacketRecvHandler
{
    public static bool send_S2C_ACK_GET_CHANNEL_LIST(Player player, Result result, List<GameChannel>? channel_list)
    {
        var err_msg = string.Empty;

        var ack_packet = new ClientToGame();
        ack_packet.Response = new ClientToGameRes();

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

        if(channel_list != null)
        {
            var client_ui_channel_list = channel_list.Select(x => new ChannelInfo() { Channel = x.channel, Trafficlevel = x.trafficlevel }).ToList();
            ack_packet.Response.GetChannelListRes.ChannelInfoList.AddRange(client_ui_channel_list);
        }

        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 entity_player = entityWithSession as Player;
        NullReferenceCheckHelper.throwIfNull(entity_player, () => "player is null !!!");
        var server_logic = GameServerApp.getServerLogic();

        var channel_action = entity_player.getEntityAction<ChannelAction>();
        if (channel_action == null)
        {
            err_msg = $"Failed to get chat action : {nameof(ChannelAction)}";
            result.setFail(ServerErrorCode.EntityActionNotFound, err_msg);
            Log.getLogger().error(err_msg);

            send_S2C_ACK_GET_CHANNEL_LIST(entity_player, result, null);
            return Task.FromResult(result);
        }

        result = channel_action.tryGetChannelList();
        if (result.isFail())
        {
            send_S2C_ACK_GET_CHANNEL_LIST(entity_player, result, null);
            return Task.FromResult(result);
        }

        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_GET_CHANNEL_LIST(player, errorResult, null);
    }
}