// Copyright (c) 2026 Dominic Masters
//
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

// Up to 4 black letterbox/pillarbox bars sized from Screen.scanX/Y/
// scanWidth/scanHeight vs Screen.width/height. Recomputed every tick,
// unconditionally -- cheap (four rectangle field writes), and a no-op
// when the scan area already covers the full viewport (Rectangle
// already skips rendering at width/height <= 0).
class Crop extends UIElement {
  init() {
    this.top = new Rectangle();
    this.bottom = new Rectangle();
    this.left = new Rectangle();
    this.right = new Rectangle();

    this.top.color = Crop.COLOR_BARS;
    this.bottom.color = Crop.COLOR_BARS;
    this.left.color = Crop.COLOR_BARS;
    this.right.color = Crop.COLOR_BARS;

    this.add(this.top);
    this.add(this.bottom);
    this.add(this.left);
    this.add(this.right);
  }

  update() {
    this.updateChildren();
    this._refresh();
  }

  _refresh() {
    const scanX = Screen.scanX;
    const scanY = Screen.scanY;
    const scanRight = scanX + Screen.scanWidth;
    const scanBottom = scanY + Screen.scanHeight;

    this.top.x = 0;
    this.top.y = 0;
    this.top.width = Screen.width;
    this.top.height = scanY;

    this.bottom.x = 0;
    this.bottom.y = scanBottom;
    this.bottom.width = Screen.width;
    this.bottom.height = Screen.height - scanBottom;

    this.left.x = 0;
    this.left.y = scanY;
    this.left.width = scanX;
    this.left.height = Screen.scanHeight;

    this.right.x = scanRight;
    this.right.y = scanY;
    this.right.width = Screen.width - scanRight;
    this.right.height = Screen.scanHeight;
  }
}

Crop.COLOR_BARS = { r: 0, g: 0, b: 0, a: 255 };

module.exports = Crop;