using ErrorOr;
using Musify.Application.Mixes;
using Musify.Application.Tests.TestSupport;
using Xunit;

namespace Musify.Application.Tests.Mixes;

public sealed class GetMixByIdQueryHandlerTests : HandlerTestBase
{
    private GetMixByIdQueryHandler CreateHandler() => new(Database);

    [Fact]
    public async Task Handle_OwnedMix_ReturnsItWithOrderedItems()
    {
        var owner = TestEntities.User();
        var mix = TestEntities.Mix(owner.Id, "Discovery");
        var second = TestEntities.MixItem(mix.Id, position: 1, title: "Second");
        var first = TestEntities.MixItem(mix.Id, position: 0, title: "First");
        await SeedAsync(owner, mix, second, first);

        var result = await CreateHandler().Handle(new GetMixByIdQuery(owner.Id, mix.Id), CancellationToken.None);

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

    [Fact]
    public async Task Handle_MixMissing_ReturnsNotFound()
    {
        var result = await CreateHandler().Handle(new GetMixByIdQuery(1, Guid.NewGuid()), CancellationToken.None);

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

    [Fact]
    public async Task Handle_MixBelongsToAnotherUser_ReturnsNotFound()
    {
        var owner = TestEntities.User(1, "owner");
        var mix = TestEntities.Mix(owner.Id);
        await SeedAsync(owner, mix);

        var result = await CreateHandler().Handle(new GetMixByIdQuery(2, mix.Id), CancellationToken.None);

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