using Xunit;
using ytLive.Helpers;
using ytLive.Services.Audio;
using ytLive.ViewModels;

namespace ytLive.Tests;

/// <summary>The TRAX bay shows the track, plays/pauses it, and carries a level — but no meter:
/// nothing measures the bed, and a decorative ladder would be a lie. Its fader moves a gain the
/// player actually applies, separate from the desktop-mute follow.
/// </summary>
public class TraxBayTests
{
    [Fact]
    public void The_trax_bay_binds_the_track_level_and_play_state_without_inventing_a_meter()
    {
        var dock = SourceAssert.Text("Controls", "AudioDock.xaml");
        Assert.Contains("Text=\"{Binding TraxTrackLabel}\"", dock);
        Assert.Contains("Value=\"{Binding TraxVolumeDb, Mode=TwoWay}\"", dock);
        Assert.Contains("Text=\"{Binding TraxVolumeDbLabel}\"", dock);
        Assert.Contains("Binding=\"{Binding IsMusicPlaying}\" Value=\"True\"", dock);
        Assert.Contains("Click=\"TraxPlayPause_Click\"", dock);

        // No ladder in the TRAX bay: nothing measures the bed, so there is nothing honest to show.
        var traxBay = dock[dock.IndexOf("Text=\"TRAX\"", System.StringComparison.Ordinal)
                           ..dock.IndexOf("Text=\"LIP-SYNC\"", System.StringComparison.Ordinal)];
        Assert.Contains("TraxTrackLabel", traxBay);
        Assert.DoesNotContain("SegmentMeter", traxBay);

        foreach (var name in new[] { "TraxVolumeDb", "TraxVolumeDbLabel", "TraxTrackLabel", "IsTraxDucking" })
            Assert.NotNull(typeof(MainViewModel).GetProperty(name));

        // The player gained a real user level, separate from the mute-follow LocalGain.
        Assert.NotNull(typeof(ITraxPlayer).GetProperty("UserGain"));
        Assert.NotNull(typeof(MusicPlayer).GetProperty("UserGain"));

        // Unity means the bed's design level, and the fader's scale is the same one as the others.
        Assert.Equal(0, GainDb.ToDb(1f), 6);
        Assert.Contains("∞", GainDb.Label(GainDb.FloorDb));   // true silence, not "-60.0"
    }
}