import { Skia, type SkImage } from '@shopify/react-native-skia';

// Turn a decoded image 90deg clockwise into a fresh SkImage. Used by the FRAME
// tab so a library photo can go landscape <-> portrait before it enters a frame:
// every consumer reads width()/height(), so the pixel-dimension swap carries the
// new orientation through the polaroid window aspect, the cover crop and the
// watermark areas without a single extra layout branch.
// ponytail: offscreen surface, same fallback as exportEngine.createSurface; a
// matrix-based draw would avoid the copy if this ever shows up in a profile.
export function rotateSkImage90(image: SkImage | null): SkImage | null {
  if (!image) return null;
  const w = image.width();
  const h = image.height();
  if (!(w > 0 && h > 0)) return null;
  // CPU-backed on purpose: a GPU (MakeOffscreen) snapshot keeps its pixels in a
  // context texture that is gone by the time the <Canvas> draws a frame later —
  // the preview then renders the photo completely black. Raster pixels survive
  // the trip to the render thread.
  const surface = Skia.Surface.Make(h, w);
  if (!surface) return image; // keep the unrotated photo on allocation failure
  const canvas = surface.getCanvas();
  canvas.clear(Skia.Color('transparent'));
  canvas.translate(h, 0);
  canvas.rotate(90, 0, 0);
  canvas.drawImage(image, 0, 0);
  return surface.makeImageSnapshot() ?? image;
}