50 lines
2.0 KiB
C#
50 lines
2.0 KiB
C#
using ErsatzTV.Core;
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using ErsatzTV.Core.Domain;
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using ErsatzTV.Core.Errors;
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using ErsatzTV.Core.Interfaces.Search;
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using ErsatzTV.Infrastructure.Data;
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using ErsatzTV.Infrastructure.Extensions;
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using Microsoft.EntityFrameworkCore;
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namespace ErsatzTV.Application.MediaCollections;
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public class DeleteCollectionHandler : IRequestHandler<DeleteCollection, Either<BaseError, Unit>>
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{
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private readonly IDbContextFactory<TvContext> _dbContextFactory;
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private readonly ISearchTargets _searchTargets;
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public DeleteCollectionHandler(IDbContextFactory<TvContext> dbContextFactory, ISearchTargets searchTargets)
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{
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_dbContextFactory = dbContextFactory;
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_searchTargets = searchTargets;
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}
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public async Task<Either<BaseError, Unit>> Handle(
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DeleteCollection request,
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CancellationToken cancellationToken)
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{
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await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
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Option<Collection> maybeCollection = await CollectionMustExist(dbContext, request, cancellationToken);
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return await maybeCollection.Match(
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Some: collection => DoDeletion(dbContext, collection, cancellationToken).Map(Right<BaseError, Unit>),
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None: () => Task.FromResult<Either<BaseError, Unit>>(
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new NotFoundError($"Collection {request.CollectionId} does not exist.")));
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}
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private async Task<Unit> DoDeletion(TvContext dbContext, Collection collection, CancellationToken cancellationToken)
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{
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dbContext.Collections.Remove(collection);
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await dbContext.SaveChangesAsync(cancellationToken);
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_searchTargets.SearchTargetsChanged();
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return Unit.Default;
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}
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private static Task<Option<Collection>> CollectionMustExist(
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TvContext dbContext,
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DeleteCollection request,
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CancellationToken cancellationToken) =>
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dbContext.Collections
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.SelectOneAsync(c => c.Id, c => c.Id == request.CollectionId, cancellationToken)
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.Map(identity);
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}
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