80 lines
3.2 KiB
C#
80 lines
3.2 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.Interfaces.Repositories;
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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 AddEpisodeToCollectionHandler :
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IRequestHandler<AddEpisodeToCollection, 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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public AddEpisodeToCollectionHandler(
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IDbContextFactory<TvContext> dbContextFactory,
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IMediaCollectionRepository mediaCollectionRepository,
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ChannelWriter<IBackgroundServiceRequest> channel)
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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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}
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public async Task<Either<BaseError, Unit>> Handle(
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AddEpisodeToCollection 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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Validation<BaseError, Parameters> validation = await Validate(dbContext, request);
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return await LanguageExtensions.Apply(
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validation,
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parameters => ApplyAddTelevisionEpisodeRequest(dbContext, parameters));
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}
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private async Task<Unit> ApplyAddTelevisionEpisodeRequest(TvContext dbContext, Parameters parameters)
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{
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parameters.Collection.MediaItems.Add(parameters.Episode);
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if (await dbContext.SaveChangesAsync() > 0)
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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
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.PlayoutIdsUsingCollection(parameters.Collection.Id))
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{
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await _channel.WriteAsync(new BuildPlayout(playoutId, PlayoutBuildMode.Refresh));
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}
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}
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return Unit.Default;
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}
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private static async Task<Validation<BaseError, Parameters>> Validate(
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TvContext dbContext,
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AddEpisodeToCollection request) =>
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(await CollectionMustExist(dbContext, request), await ValidateEpisode(dbContext, request))
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.Apply((collection, episode) => new Parameters(collection, episode));
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private static Task<Validation<BaseError, Collection>> CollectionMustExist(
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TvContext dbContext,
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AddEpisodeToCollection request) =>
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dbContext.Collections
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.Include(c => c.MediaItems)
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.SelectOneAsync(c => c.Id, c => c.Id == request.CollectionId)
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.Map(o => o.ToValidation<BaseError>("Collection does not exist."));
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private static Task<Validation<BaseError, Episode>> ValidateEpisode(
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TvContext dbContext,
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AddEpisodeToCollection request) =>
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dbContext.Episodes
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.SelectOneAsync(e => e.Id, e => e.Id == request.EpisodeId)
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.Map(o => o.ToValidation<BaseError>("Episode does not exist"));
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private record Parameters(Collection Collection, Episode Episode);
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}
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