Stream custom live channels using your own media
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using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using ErsatzTV.Core;
using ErsatzTV.Core.Domain;
using ErsatzTV.Infrastructure.Data;
using LanguageExt;
using MediatR;
using Microsoft.EntityFrameworkCore;
using static ErsatzTV.Application.MediaCollections.Mapper;
using static LanguageExt.Prelude;
namespace ErsatzTV.Application.MediaCollections.Commands
{
public class CreateCollectionHandler :
IRequestHandler<CreateCollection, Either<BaseError, MediaCollectionViewModel>>
{
private readonly IDbContextFactory<TvContext> _dbContextFactory;
public CreateCollectionHandler(IDbContextFactory<TvContext> dbContextFactory) =>
_dbContextFactory = dbContextFactory;
public async Task<Either<BaseError, MediaCollectionViewModel>> Handle(
CreateCollection request,
CancellationToken cancellationToken)
{
await using TvContext dbContext = _dbContextFactory.CreateDbContext();
Validation<BaseError, Collection> validation = await Validate(dbContext, request);
return await validation.Apply(c => PersistCollection(dbContext, c));
}
private static async Task<MediaCollectionViewModel> PersistCollection(
TvContext dbContext,
Collection collection)
{
await dbContext.Collections.AddAsync(collection);
await dbContext.SaveChangesAsync();
return ProjectToViewModel(collection);
}
private static Task<Validation<BaseError, Collection>> Validate(
TvContext dbContext,
CreateCollection request) =>
ValidateName(dbContext, request).MapT(
name => new Collection
{
Name = name,
MediaItems = new List<MediaItem>()
});
private static async Task<Validation<BaseError, string>> ValidateName(
TvContext dbContext,
CreateCollection createCollection)
{
List<string> allNames = await dbContext.Collections
.Map(c => c.Name)
.ToListAsync();
Validation<BaseError, string> result1 = createCollection.NotEmpty(c => c.Name)
.Bind(_ => createCollection.NotLongerThan(50)(c => c.Name));
var result2 = Optional(createCollection.Name)
.Where(name => !allNames.Contains(name))
.ToValidation<BaseError>("Collection name must be unique");
return (result1, result2).Apply((_, _) => createCollection.Name);
}
}
}