ersatztv/ErsatzTV.Application/Channels/Queries/GetAllChannelsForApiHandler.cs

using ErsatzTV.Core.Api.Channels;
using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Interfaces.Repositories;
using static ErsatzTV.Application.Channels.Mapper;

namespace ErsatzTV.Application.Channels;

public class GetAllChannelsForApiHandler(IChannelRepository channelRepository)
    : IRequestHandler<GetAllChannelsForApi, List<ChannelResponseModel>>
{
    public async Task<List<ChannelResponseModel>> Handle(
        GetAllChannelsForApi request,
        CancellationToken cancellationToken)
    {
        List<Channel> channels = Optional(await channelRepository.GetAll(cancellationToken)).Flatten().ToList();
        var playoutIds = channels
            .SelectMany(c => ContributingPlayouts(c).Select(p => p.Id))
            .Distinct()
            .ToList();
        Dictionary<int, PlayoutUpcoming> upcoming =
            await channelRepository.GetPlayoutUpcomingHealth(playoutIds, DateTime.UtcNow, cancellationToken);
        return channels.Map(c => ProjectToResponseModel(c, GetPlayoutsCount(c), upcoming)).ToList();
    }
}