using System.Threading;
using System.Threading.Tasks;
using ErsatzTV.Core;
using ErsatzTV.Core.Interfaces.Repositories;
using LanguageExt;
using static LanguageExt.Prelude;

namespace ErsatzTV.Application.Maintenance.Commands
{
    public class DeleteOrphanedArtworkHandler : MediatR.IRequestHandler<DeleteOrphanedArtwork, Either<BaseError, Unit>>
    {
        private readonly IArtworkRepository _artworkRepository;

        public DeleteOrphanedArtworkHandler(IArtworkRepository artworkRepository) =>
            _artworkRepository = artworkRepository;

        public Task<Either<BaseError, Unit>>
            Handle(DeleteOrphanedArtwork request, CancellationToken cancellationToken) =>
            _artworkRepository.GetOrphanedArtwork()
                .Bind(_artworkRepository.Delete)
                .Map(_ => Right<BaseError, Unit>(Unit.Default));
    }
}