using System.Windows.Media;

namespace ytLive.Models;

/// <summary>
/// The transient zoom layer: a real scene element parked at z-index 1 (above the
/// background, below every other layer) whose pixels are the 2x-magnified backdrop
/// centred on the zoom box. The app paints it into the stream/recording exactly like
/// any other layer. While inactive it is a 0x0 invisible placeholder that is never
/// persisted (LayoutStore hand-rolls only Source/WebcamSceneConfig rows) — the VM
/// re-inserts it on load and on scene creation, mirroring how backgrounds heal.
/// </summary>
public sealed class ZoomSceneElement : SceneElement
{
    /// <summary>True only while a zoom box is live; flips Kind so the layer leaves
    /// the baked static base and composites per-frame.</summary>
    public bool IsZoomActive { get; set; }

    public override ElementKind Kind => IsZoomActive ? ElementKind.Dynamic : ElementKind.Static;

    public override bool IsZoomLayer => true;

    public override bool IsDraggable => false;

    /// <summary>Never rendered by the element template — the preview magnifier
    /// (ZoomBox) and the output resolver own its pixels.</summary>
    public override ImageSource? DisplaySource => null;
}