54 lines
2.0 KiB
C#
54 lines
2.0 KiB
C#
using ErrorOr;
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using Mediator;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.Extensions.Logging;
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using Musify.Application.Contracts;
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using Musify.Application.Shared;
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namespace Musify.Application.Albums;
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public record RemoveTrackFromAlbumCommand(long UserId, Guid AlbumId, Guid TrackId)
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: ICommand<ErrorOr<Success>>;
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public class RemoveTrackFromAlbumCommandHandler(
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IDatabase database,
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ILogger<RemoveTrackFromAlbumCommandHandler> logger)
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: ICommandHandler<RemoveTrackFromAlbumCommand, ErrorOr<Success>>
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{
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public async ValueTask<ErrorOr<Success>> Handle(RemoveTrackFromAlbumCommand request, CancellationToken cancellationToken)
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{
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var album = await database.Albums
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.AsNoTracking()
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.SingleOrDefaultAsync(a => a.Id == request.AlbumId, cancellationToken);
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if (album == null)
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return AppErrors.NotFound("Album", request.AlbumId);
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if (album.OwnerUserId != request.UserId)
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return AppErrors.Forbidden("Album", request.AlbumId);
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var albumTracks = await database.AlbumHasTracks
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.Where(albumTrack => albumTrack.AlbumId == request.AlbumId)
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.OrderBy(albumTrack => albumTrack.TrackNumber)
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.ToListAsync(cancellationToken);
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var link = albumTracks.SingleOrDefault(albumTrack => albumTrack.TrackId == request.TrackId);
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if (link == null)
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{
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logger.LogInformation("Track {TrackId} not in album {AlbumId}", request.TrackId, request.AlbumId);
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return Error.NotFound(description: "Track is not in the album.");
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}
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database.AlbumHasTracks.Remove(link);
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var trackNumber = 1;
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foreach (var remaining in albumTracks.Where(albumTrack => albumTrack.Id != link.Id))
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remaining.TrackNumber = trackNumber++;
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await database.SaveChangesAsync(cancellationToken);
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logger.LogInformation("Removed track {TrackId} from album {AlbumId}", request.TrackId, request.AlbumId);
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return new Success();
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}
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}
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