50 lines
2.1 KiB
C#
50 lines
2.1 KiB
C#
using System.Collections.Generic;
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using System.Linq;
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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.Domain;
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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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using static ErsatzTV.Application.MediaCollections.Mapper;
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using static LanguageExt.Prelude;
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namespace ErsatzTV.Application.MediaCollections.Commands
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{
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public class CreateSimpleMediaCollectionHandler : IRequestHandler<CreateSimpleMediaCollection,
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Either<BaseError, MediaCollectionViewModel>>
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{
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private readonly IMediaCollectionRepository _mediaCollectionRepository;
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public CreateSimpleMediaCollectionHandler(IMediaCollectionRepository mediaCollectionRepository) =>
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_mediaCollectionRepository = mediaCollectionRepository;
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public Task<Either<BaseError, MediaCollectionViewModel>> Handle(
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CreateSimpleMediaCollection request,
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CancellationToken cancellationToken) =>
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Validate(request).MapT(PersistCollection).Bind(v => v.ToEitherAsync());
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private Task<MediaCollectionViewModel> PersistCollection(SimpleMediaCollection c) =>
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_mediaCollectionRepository.Add(c).Map(ProjectToViewModel);
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private Task<Validation<BaseError, SimpleMediaCollection>> Validate(CreateSimpleMediaCollection request) =>
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ValidateName(request).MapT(name => new SimpleMediaCollection { Name = name });
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private async Task<Validation<BaseError, string>> ValidateName(CreateSimpleMediaCollection createCollection)
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{
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List<string> allNames = await _mediaCollectionRepository.GetSimpleMediaCollections()
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.Map(list => list.Map(c => c.Name).ToList());
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Validation<BaseError, string> result1 = createCollection.NotEmpty(c => c.Name)
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.Bind(_ => createCollection.NotLongerThan(50)(c => c.Name));
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var result2 = Optional(createCollection.Name)
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.Filter(name => !allNames.Contains(name))
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.ToValidation<BaseError>("Media collection name must be unique");
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return (result1, result2).Apply((_, _) => createCollection.Name);
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}
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}
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}
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