window.onload = () => {
  const thisYear = new Date().getFullYear();
  const yearNode = document.getElementById('footer-year');
  const scrollTopElement = document.getElementById('scroll-top');
  const scrollTopAction = document.getElementById('scroll-top-action');
  const storeLinks = document.getElementsByClassName('js-store-link');

  function changeScrollTopVisibility() {
    if (scrollTopElement) {
      if (window.innerHeight < window.scrollY) {
        scrollTopElement.classList.add('scroll-top--visible');
      } else {
        scrollTopElement.classList.remove('scroll-top--visible');
      }
    }
  }

  if (yearNode) {
    yearNode.innerHTML = `${thisYear}`;
  }

  changeScrollTopVisibility();

  window.addEventListener('scroll', (e) => {
    changeScrollTopVisibility();
  });

  if(scrollTopAction) {
    scrollTopAction.addEventListener('click', (e) => {
      e.preventDefault();
      window.scrollTo(0, 0);
    });
  }

  // Метрика
  function sendMetrika(type, data) {
    if (!data) {
      data = {};
    }
    window.postMessage(
      {
        host: 'premier.one', //window.document.location.host, - чтобы работало на тестовом, сейчас передаем боевой домен
        type: `analytics::${type}`,
        data,
      },
      '*',
    );
  }

  function storeButtonClick(store, source = 'site') {
    sendMetrika('users_leave_appmarket', { store, source });
  }

  if (storeLinks.length) {
    for (const link of storeLinks) {
      link.addEventListener('click', (e) => {
        var store = e.currentTarget.getAttribute('data-store');
        storeButtonClick(store);
      });
    }
  }
};