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

namespace ytLive.Tests;

/// <summary>The master strip is where the accessibility switch lives, so its wiring matters more
/// than its looks: MONO must reach the mixer, be remembered across sessions, and the strip's ladder
/// must show the MEASURED mix — with one L/R flag instead of two ladders.
/// </summary>
public class MasterStripTests
{
    [Fact]
    public void The_master_strip_shows_the_measured_mix_and_the_mono_switch_is_persisted()
    {
        var dock = SourceAssert.Text("Controls", "AudioDock.xaml");
        Assert.Contains("IsChecked=\"{Binding MonoOutput, Mode=TwoWay}\"", dock);
        Assert.Contains("Level=\"{Binding MasterMeterFraction}\"", dock);
        Assert.Contains("Text=\"{Binding MasterLevelLabel}\"", dock);
        Assert.Contains("Visibility=\"{Binding MasterImbalance, Converter={StaticResource BoolToVis}}\"", dock);
        // One ladder on the master, not a pair.
        Assert.Equal(1, System.Text.RegularExpressions.Regex.Matches(
            dock[dock.IndexOf("MASTER", System.StringComparison.Ordinal)..], "SegmentMeter").Count);

        // The switch reaches the mixer and the store.
        Assert.NotNull(typeof(AudioMixer).GetProperty("MonoOutput"));
        Assert.NotNull(typeof(MainViewModel).GetProperty("MonoOutput"));
        var settings = SourceAssert.Text("Services", "LayoutStore.Settings.cs");
        Assert.Contains("Audio.MonoOutput", settings);
        Assert.Contains("LoadMonoOutput", settings);

        // The mixer measures the finished mix, so the ladder cannot show a source instead of the output.
        Assert.NotNull(typeof(AudioMixer).GetProperty("MasterLevel"));
        Assert.NotNull(typeof(AudioMixer).GetProperty("MasterImbalanceDb"));

        // And the fold is the tested helper, not new arithmetic in the mixer.
        Assert.Contains("AudioFold.ToMono", SourceAssert.Text("Services", "Audio", "AudioMixer.cs"));
        Assert.Equal(0.25f, GainDb.MonoFold(0.5f, 0f));
    }
}