/**
 * Inverts an orientation string.
 * @public
 * @function invertOrientationString
 *
 * @param  {string} orientationString The orientation.
 * @returns {string}  The inverted orientationString.
 */
export default function(orientationString) {
  let inverted = orientationString.replace('H', 'f')

  inverted = inverted.replace('F', 'h')
  inverted = inverted.replace('R', 'l')
  inverted = inverted.replace('L', 'r')
  inverted = inverted.replace('A', 'p')
  inverted = inverted.replace('P', 'a')
  inverted = inverted.toUpperCase()

  return inverted
}