Stream custom live channels using your own media
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using System.Collections.Generic;
using System.Linq;
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 CreateSmartCollectionHandler :
IRequestHandler<CreateSmartCollection, Either<BaseError, SmartCollectionViewModel>>
{
private readonly IDbContextFactory<TvContext> _dbContextFactory;
public CreateSmartCollectionHandler(IDbContextFactory<TvContext> dbContextFactory) =>
_dbContextFactory = dbContextFactory;
public async Task<Either<BaseError, SmartCollectionViewModel>> Handle(
CreateSmartCollection request,
CancellationToken cancellationToken)
{
await using TvContext dbContext = _dbContextFactory.CreateDbContext();
Validation<BaseError, SmartCollection> validation = await Validate(dbContext, request);
return await validation.Apply(c => PersistCollection(dbContext, c));
}
private static async Task<SmartCollectionViewModel> PersistCollection(
TvContext dbContext,
SmartCollection smartCollection)
{
await dbContext.SmartCollections.AddAsync(smartCollection);
await dbContext.SaveChangesAsync();
return ProjectToViewModel(smartCollection);
}
private static Task<Validation<BaseError, SmartCollection>> Validate(
TvContext dbContext,
CreateSmartCollection request) =>
ValidateName(dbContext, request).MapT(
name => new SmartCollection
{
Name = name,
Query = request.Query
});
private static async Task<Validation<BaseError, string>> ValidateName(
TvContext dbContext,
CreateSmartCollection createSmartCollection)
{
List<string> allNames = await dbContext.SmartCollections
.Map(c => c.Name)
.ToListAsync();
Validation<BaseError, string> result1 = createSmartCollection.NotEmpty(c => c.Name)
.Bind(_ => createSmartCollection.NotLongerThan(50)(c => c.Name));
var result2 = Optional(createSmartCollection.Name)
.Where(name => !allNames.Contains(name))
.ToValidation<BaseError>("SmartCollection name must be unique");
return (result1, result2).Apply((_, _) => createSmartCollection.Name);
}
}
}