export default function LightenDarkenColor(col: string, amt: number) {
	let usePound = false;

	if (col[0] == "#") {
		col = col.slice(1);
		usePound = true;
	}

	if (col.length === 3) {
		col = col
			.split("")
			.map(item => {
				return item + item;
			})
			.join("");
	}

	const num = parseInt(col, 16);

	let r = (num >> 16) + amt;

	if (r > 255) r = 255;
	else if (r < 0) r = 0;

	let b = ((num >> 8) & 0x00ff) + amt;

	if (b > 255) b = 255;
	else if (b < 0) b = 0;

	let g = (num & 0x0000ff) + amt;

	if (g > 255) g = 255;
	else if (g < 0) g = 0;
	return (usePound ? "#" : "") + (g | (b << 8) | (r << 16)).toString(16).padStart(6, "0");
}