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 GetChannelByIdForApiHandler(IChannelRepository channelRepository)
    : IRequestHandler<GetChannelByIdForApi, Option<ChannelDetailResponseModel>>
{
    public async Task<Option<ChannelDetailResponseModel>> Handle(
        GetChannelByIdForApi request,
        CancellationToken cancellationToken)
    {
        Option<Channel> maybeChannel = await channelRepository.GetChannel(request.Id);

        foreach (Channel channel in maybeChannel)
        {
            var playoutIds = ContributingPlayouts(channel).Select(p => p.Id).Distinct().ToList();
            Dictionary<int, PlayoutUpcoming> upcoming =
                await channelRepository.GetPlayoutUpcomingHealth(playoutIds, DateTime.UtcNow, cancellationToken);
            return ProjectToDetailResponseModel(channel, GetPlayoutsCount(channel), upcoming);
        }

        return Option<ChannelDetailResponseModel>.None;
    }
}