const calculateNewDimensionsFromScale = ({
	width,
	height,
	scale,
}: {
	width: number;
	height: number;
	scale: number;
}) => {
	const scaledWidth = Math.round(width * scale);
	const scaledHeight = Math.round(height * scale);
	return {
		width: scaledWidth,
		height: scaledHeight,
	};
};

export const resizeVideoFrame = ({
	frame,
	scale,
}: {
	frame: VideoFrame;
	scale: number;
}) => {
	// No resize, no rotation
	if (scale === 1) {
		return frame;
	}

	const {width, height} = calculateNewDimensionsFromScale({
		height: frame.displayHeight,
		width: frame.displayWidth,
		scale,
	});

	const canvas = new OffscreenCanvas(width, height);
	const ctx = canvas.getContext('2d');
	if (!ctx) {
		throw new Error('Could not get 2d context');
	}

	canvas.width = width;
	canvas.height = height;

	ctx.scale(scale, scale);

	ctx.drawImage(frame, 0, 0);

	return new VideoFrame(canvas, {
		displayHeight: height,
		displayWidth: width,
		duration: frame.duration ?? undefined,
		timestamp: frame.timestamp,
	});
};