namespace ytLive.Services;

/// <summary>
/// Pure show/hide state machine for the game audio bar (TASK 4 game audio).
/// SHOW: a full-screen foreground app has been producing desktop audio for at
/// least <see cref="ShowAfterSound"/> — "a working game with sound". HIDE: the
/// app leaves fullscreen/foreground for <see cref="HideAfterWindowed"/> — the
/// game is no longer up in the preview. Silence NEVER hides an active bar; it
/// only matters for the initial show. No timers; <see cref="Update"/> is fed by
/// the caller with a clock.
/// </summary>
public sealed class GameAudioHysteresis
{
    private readonly TimeSpan _showAfterSound = TimeSpan.FromMilliseconds(500);
    private readonly TimeSpan _hideAfterWindowed = TimeSpan.FromSeconds(1);

    private DateTime? _soundSince;
    private DateTime? _windowedSince;

    public bool IsActive { get; private set; }

    public void Update(bool isFullScreen, bool hasSound, DateTime now)
    {
        if (isFullScreen)
        {
            _windowedSince = null;
            if (IsActive)
                return;

            if (!hasSound)
            {
                _soundSince = null;
                return;
            }

            _soundSince ??= now;
            if (now - _soundSince >= _showAfterSound)
                IsActive = true;
        }
        else
        {
            _soundSince = null;
            if (!IsActive)
            {
                _windowedSince = null;
                return;
            }

            _windowedSince ??= now;
            if (now - _windowedSince >= _hideAfterWindowed)
            {
                IsActive = false;
                _windowedSince = null;
            }
        }
    }
}