using Musify.Application.Genres;
using Musify.Domain.ValueObjects;
using Xunit;

namespace Musify.Application.Tests.Genres
{
    public sealed class GetAvailableGenresQueryHandlerTests
    {
        private static async Task<IReadOnlyList<AvailableGenreResponse>> RunAsync() =>
            await new GetAvailableGenresQueryHandler().Handle(new GetAvailableGenresQuery(), TestContext.Current.CancellationToken);

        [Fact]
        public async Task Handle_ReturnsEveryGenre()
        {
            var result = await RunAsync();

            Assert.Equal(Enum.GetValues<Genre>(), result.Select(r => r.Genre));
        }

        [Fact]
        public async Task Handle_ListsIncompatibleGenresSymmetrically()
        {
            var result = await RunAsync();

            var metal = result.Single(r => r.Genre == Genre.Metal);
            var lofi = result.Single(r => r.Genre == Genre.Lofi);
            Assert.Contains(Genre.Lofi, metal.IncompatibleWith);
            Assert.Contains(Genre.Metal, lofi.IncompatibleWith);
            Assert.Empty(result.Single(r => r.Genre == Genre.Pop).IncompatibleWith);
        }
    }
}