32 lines
1.2 KiB
C#
32 lines
1.2 KiB
C#
using System.Threading;
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using System.Threading.Tasks;
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using ErsatzTV.Core;
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using ErsatzTV.Core.Interfaces.Repositories;
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using LanguageExt;
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using MediatR;
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namespace ErsatzTV.Application.MediaItems.Commands
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{
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public class DeleteMediaItemHandler : IRequestHandler<DeleteMediaItem, Either<BaseError, Task>>
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{
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private readonly IMediaItemRepository _mediaItemRepository;
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public DeleteMediaItemHandler(IMediaItemRepository mediaItemRepository) =>
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_mediaItemRepository = mediaItemRepository;
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public async Task<Either<BaseError, Task>> Handle(
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DeleteMediaItem request,
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CancellationToken cancellationToken) =>
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(await MediaItemMustExist(request))
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.Map(DoDeletion)
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.ToEither<Task>();
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private Task DoDeletion(int mediaItemId) => _mediaItemRepository.Delete(mediaItemId);
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private async Task<Validation<BaseError, int>> MediaItemMustExist(DeleteMediaItem deleteMediaItem) =>
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(await _mediaItemRepository.Get(deleteMediaItem.MediaItemId))
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.ToValidation<BaseError>($"MediaItem {deleteMediaItem.MediaItemId} does not exist.")
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.Map(c => c.Id);
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}
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}
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