63 lines
2.2 KiB
C#
63 lines
2.2 KiB
C#
using ErsatzTV.Core;
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using ErsatzTV.Core.Domain;
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using ErsatzTV.Infrastructure.Data;
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using Microsoft.EntityFrameworkCore;
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using static ErsatzTV.Application.MediaCollections.Mapper;
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namespace ErsatzTV.Application.MediaCollections;
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public class CreateCollectionHandler :
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IRequestHandler<CreateCollection, Either<BaseError, MediaCollectionViewModel>>
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{
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private readonly IDbContextFactory<TvContext> _dbContextFactory;
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public CreateCollectionHandler(IDbContextFactory<TvContext> dbContextFactory) =>
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_dbContextFactory = dbContextFactory;
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public async Task<Either<BaseError, MediaCollectionViewModel>> Handle(
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CreateCollection request,
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CancellationToken cancellationToken)
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{
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await using TvContext dbContext = _dbContextFactory.CreateDbContext();
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Validation<BaseError, Collection> validation = await Validate(dbContext, request);
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return await validation.Apply(c => PersistCollection(dbContext, c));
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}
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private static async Task<MediaCollectionViewModel> PersistCollection(
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TvContext dbContext,
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Collection collection)
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{
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await dbContext.Collections.AddAsync(collection);
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await dbContext.SaveChangesAsync();
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return ProjectToViewModel(collection);
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}
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private static Task<Validation<BaseError, Collection>> Validate(
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TvContext dbContext,
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CreateCollection request) =>
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ValidateName(dbContext, request).MapT(
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name => new Collection
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{
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Name = name,
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MediaItems = new List<MediaItem>()
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});
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private static async Task<Validation<BaseError, string>> ValidateName(
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TvContext dbContext,
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CreateCollection createCollection)
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{
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List<string> allNames = await dbContext.Collections
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.Map(c => c.Name)
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.ToListAsync();
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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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.Where(name => !allNames.Contains(name))
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.ToValidation<BaseError>("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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