using ErrorOr;
using Musify.Application.PlayLists;
using Musify.Application.Tests.TestSupport;
using Musify.Domain.Entities;
using Xunit;

namespace Musify.Application.Tests.PlayLists;

public sealed class GetPlayListTracksQueryHandlerTests : HandlerTestBase
{
    private GetPlayListTracksQueryHandler CreateHandler() => new(Database);

    [Fact]
    public async Task Handle_TracksOrderedByPosition_ReturnsThemInOrder()
    {
        var owner = TestEntities.User();
        var playList = TestEntities.PlayList(owner.Id);
        var second = TestEntities.LocalTrack(owner, "Second");
        var first = TestEntities.LocalTrack(owner, "First");
        await SeedAsync(
            owner, playList, second, first,
            new PlayListHasTrack { PlayListId = playList.Id, TrackId = second.Id, Position = 1 },
            new PlayListHasTrack { PlayListId = playList.Id, TrackId = first.Id, Position = 0 });

        var result = await CreateHandler().Handle(new GetPlayListTracksQuery(playList.Id, PageNumber: 1, PageSize: 10), CancellationToken.None);

        Assert.False(result.IsError);
        Assert.Equal(["First", "Second"], result.Value.Items.Select(track => track.Title));
    }

    [Fact]
    public async Task Handle_PlayListMissing_ReturnsNotFound()
    {
        var result = await CreateHandler().Handle(new GetPlayListTracksQuery(Guid.NewGuid(), PageNumber: 1, PageSize: 10), CancellationToken.None);

        Assert.Equal(ErrorType.NotFound, result.FirstError.Type);
    }
}