function handleScrollButonDisplay() {
  const scrollerTop = document.querySelector('#scroller-top');

  if (
    document.body.scrollTop > window.innerHeight / 2 ||
    document.documentElement.scrollTop > window.innerHeight / 2
  ) {
    scrollerTop.removeAttribute('aria-hidden');
  } else {
    scrollerTop.setAttribute('aria-hidden', 'true');
  }
}
function scrollTop() {
  window.scrollTo({
    top: 0,
    behavior: 'smooth',
  });
}

export default function scrollerTopInit() {
  const scrollerTop = document.querySelector('#scroller-top');
  if (!scrollerTop) return;

  window.addEventListener('scroll', handleScrollButonDisplay);
  scrollerTop.addEventListener('click', scrollTop);
}