using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Interfaces.Repositories;
using LanguageExt;
using MediatR;
using static ErsatzTV.Application.Libraries.Mapper;

namespace ErsatzTV.Application.Libraries.Queries
{
    public class GetAllLocalLibrariesHandler : IRequestHandler<GetAllLocalLibraries, List<LocalLibraryViewModel>>
    {
        private readonly ILibraryRepository _libraryRepository;

        public GetAllLocalLibrariesHandler(ILibraryRepository libraryRepository) => _libraryRepository = libraryRepository;

        public Task<List<LocalLibraryViewModel>> Handle(
            GetAllLocalLibraries request,
            CancellationToken cancellationToken) =>
            _libraryRepository.GetAll()
                .Map(
                    list => list
                        .OfType<LocalLibrary>()
                        .OrderBy(l => l.MediaKind)
                        .Map(ProjectToViewModel)
                        .ToList());
    }
}