/**
 * Sums the passed percentage to the R, G or B of a HEX color
 * @param {string} color The color to change
 * @param {number} amount The amount to change the color by
 * @returns {string} The processed part of the color
 */
function addLight(color: string, amount: number) {
  const cc = parseInt(color, 16) + amount;
  const c = cc > 255 ? 255 : cc;
  return c.toString(16).length > 1 ? c.toString(16) : `0${c.toString(16)}`;
}

/**
 * Lightens a 6 char HEX color according to the passed percentage
 * @param {string} color The color to change
 * @param {number} amount The amount to change the color by
 * @returns {string} The processed color represented as HEX
 */
export function lighten(color: string, amount: number) {
  color = color.indexOf('#') >= 0 ? color.substring(1, color.length) : color;
  amount = Math.trunc((255 * amount) / 100);
  return `#${addLight(color.substring(0, 2), amount)}${addLight(
    color.substring(2, 4),
    amount
  )}${addLight(color.substring(4, 6), amount)}`;
}
