108 lines
4.3 KiB
C#
108 lines
4.3 KiB
C#
using System.Threading.Channels;
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using ErsatzTV.Application.Playouts;
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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.Repositories;
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using ErsatzTV.Core.Interfaces.Search;
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using ErsatzTV.Core.Scheduling;
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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 UpdateCollectionHandler : IRequestHandler<UpdateCollection, Either<BaseError, Unit>>
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{
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private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
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private readonly IDbContextFactory<TvContext> _dbContextFactory;
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private readonly IMediaCollectionRepository _mediaCollectionRepository;
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private readonly ISearchTargets _searchTargets;
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public UpdateCollectionHandler(
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IDbContextFactory<TvContext> dbContextFactory,
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IMediaCollectionRepository mediaCollectionRepository,
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ChannelWriter<IBackgroundServiceRequest> channel,
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ISearchTargets searchTargets)
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{
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_dbContextFactory = dbContextFactory;
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_mediaCollectionRepository = mediaCollectionRepository;
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_channel = channel;
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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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UpdateCollection 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: async collection =>
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{
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Validation<BaseError, Collection> validation = await Validate(dbContext, request, collection);
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return await validation.Apply(c => ApplyUpdateRequest(dbContext, c, request, cancellationToken));
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},
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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> ApplyUpdateRequest(
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TvContext dbContext,
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Collection c,
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UpdateCollection request,
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CancellationToken cancellationToken)
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{
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c.Name = request.Name;
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foreach (bool useCustomPlaybackOrder in request.UseCustomPlaybackOrder)
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{
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c.UseCustomPlaybackOrder = useCustomPlaybackOrder;
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}
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if (await dbContext.SaveChangesAsync(cancellationToken) > 0 && request.UseCustomPlaybackOrder.IsSome)
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{
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// refresh all playouts that use this collection
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foreach (int playoutId in await _mediaCollectionRepository.PlayoutIdsUsingCollection(
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request.CollectionId))
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{
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await _channel.WriteAsync(new BuildPlayout(playoutId, PlayoutBuildMode.Refresh), cancellationToken);
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}
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}
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_searchTargets.SearchTargetsChanged();
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return Unit.Default;
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}
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private static async Task<Validation<BaseError, Collection>> Validate(
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TvContext dbContext,
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UpdateCollection request,
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Collection collection) =>
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(await ValidateName(dbContext, request)).Map(_ => collection);
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private static Task<Option<Collection>> CollectionMustExist(
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TvContext dbContext,
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UpdateCollection updateCollection,
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CancellationToken cancellationToken) =>
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dbContext.Collections
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.SelectOneAsync(c => c.Id, c => c.Id == updateCollection.CollectionId, cancellationToken)
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.Map(identity);
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private static async Task<Validation<BaseError, string>> ValidateName(
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TvContext dbContext,
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UpdateCollection updateCollection)
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{
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Validation<BaseError, string> result1 = updateCollection.NotEmpty(c => c.Name)
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.Bind(_ => updateCollection.NotLongerThan(50)(c => c.Name));
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bool duplicateName = await dbContext.Collections
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.AnyAsync(c => c.Id != updateCollection.CollectionId && c.Name == updateCollection.Name);
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Validation<BaseError, Unit> result2 = duplicateName
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? Fail<BaseError, Unit>("Collection name must be unique")
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: Success<BaseError, Unit>(Unit.Default);
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return (result1, result2).Apply((_, _) => updateCollection.Name);
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}
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}
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