using VoiceCat.Core;

namespace VoiceCat.Tests;

public class AudioRouteWatcherTests
{
    // Reconfiguring a session moves the route, and moving the route is reported back as a change.
    // Acting on that echo rebuilds the graph that caused it, which is the audio flipping between
    // two routes without end rather than one reconfiguration.
    [Fact]
    public void ARouteThatMatchesTheLiveGraphIsNotRebuiltFor()
    {
        var watcher = new AudioRouteWatcher();

        // Nothing is known about a graph built before anything was recorded.
        Assert.True(watcher.ShouldRebuild("builtInMic|builtInSpeaker"));

        watcher.Built("builtInMic|builtInSpeaker");
        // The echo of the Apply that produced this route, however often it is reported.
        Assert.False(watcher.ShouldRebuild("builtInMic|builtInSpeaker"));
        Assert.False(watcher.ShouldRebuild("builtInMic|builtInSpeaker"));

        // A headset arriving is hardware the graph is not built on: rebuild, then settle again.
        Assert.True(watcher.ShouldRebuild("headsetMic|headset"));
        watcher.Built("headsetMic|headset");
        Assert.False(watcher.ShouldRebuild("headsetMic|headset"));

        // Forcing the speaker takes the headset out of the route. The rebuild that does it records
        // the result, so the change it is reported as does not drive a second rebuild.
        watcher.Built("builtInMic|builtInSpeaker");
        Assert.False(watcher.ShouldRebuild("builtInMic|builtInSpeaker"));
        // And releasing it, which brings the headset back, is one rebuild and no more.
        Assert.True(watcher.ShouldRebuild("headsetMic|headset"));
        watcher.Built("headsetMic|headset");
        Assert.False(watcher.ShouldRebuild("headsetMic|headset"));

        // A released session has no route left to compare against.
        watcher.Reset();
        Assert.True(watcher.ShouldRebuild("headsetMic|headset"));
    }
}