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 GetPlayListByIdQueryHandlerTests : HandlerTestBase
{
    private GetPlayListByIdQueryHandler CreateHandler() => new(Database);

    [Fact]
    public async Task Handle_ExistingPlayList_ReturnsItWithCoverTrackIds()
    {
        var owner = TestEntities.User();
        var playList = TestEntities.PlayList(owner.Id, visibility: Musify.Domain.ValueObjects.PlaylistVisibility.Public);
        var track = TestEntities.Track(owner);
        await SeedAsync(owner, playList, track, new PlayListHasTrack { PlayListId = playList.Id, TrackId = track.Id, Position = 0 });

        var result = await CreateHandler().Handle(new GetPlayListByIdQuery(playList.Id), TestContext.Current.CancellationToken);

        Assert.False(result.IsError);
        Assert.Equal(playList.Name, result.Value.Name);
        Assert.Equal([track.Id], result.Value.CoverTrackIds);
    }

    [Fact]
    public async Task Handle_PlayListMissing_ReturnsNotFound()
    {
        var result = await CreateHandler().Handle(new GetPlayListByIdQuery(Guid.NewGuid()), TestContext.Current.CancellationToken);

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

    [Fact]
    public async Task Handle_PrivatePlayList_RequestedByOwner_ReturnsIt()
    {
        var owner = TestEntities.User();
        var playList = TestEntities.PlayList(owner.Id, visibility: Musify.Domain.ValueObjects.PlaylistVisibility.Private);
        await SeedAsync(owner, playList);

        var result = await CreateHandler().Handle(new GetPlayListByIdQuery(playList.Id, owner.Id), TestContext.Current.CancellationToken);

        Assert.False(result.IsError);
    }

    [Fact]
    public async Task Handle_PrivatePlayList_RequestedByStranger_ReturnsNotFound()
    {
        var owner = TestEntities.User(1, "owner");
        var stranger = TestEntities.User(2, "stranger");
        var playList = TestEntities.PlayList(owner.Id, visibility: Musify.Domain.ValueObjects.PlaylistVisibility.Private);
        await SeedAsync(owner, stranger, playList);

        var result = await CreateHandler().Handle(new GetPlayListByIdQuery(playList.Id, stranger.Id), TestContext.Current.CancellationToken);

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

    [Fact]
    public async Task Handle_PrivatePlayList_RequestedAnonymously_ReturnsNotFound()
    {
        var owner = TestEntities.User();
        var playList = TestEntities.PlayList(owner.Id, visibility: Musify.Domain.ValueObjects.PlaylistVisibility.Private);
        await SeedAsync(owner, playList);

        var result = await CreateHandler().Handle(new GetPlayListByIdQuery(playList.Id, RequestingUserId: null), TestContext.Current.CancellationToken);

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

    [Fact]
    public async Task Handle_PublicPlayList_RequestedAnonymously_ReturnsIt()
    {
        var owner = TestEntities.User();
        var playList = TestEntities.PlayList(owner.Id, visibility: Musify.Domain.ValueObjects.PlaylistVisibility.Public);
        await SeedAsync(owner, playList);

        var result = await CreateHandler().Handle(new GetPlayListByIdQuery(playList.Id, RequestingUserId: null), TestContext.Current.CancellationToken);

        Assert.False(result.IsError);
    }
}