window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  function setupGA4() {
    const gtagScript = document.createElement('script');
    gtagScript.async = true;
    gtagScript.src = 'https://www.googletagmanager.com/gtag/js?id=G-7G9HS8437V';
    const firstScript = document.getElementsByTagName('script')[0];
    firstScript.parentNode.insertBefore(gtagScript, firstScript);

    gtag('js', new Date());

    gtag('config', 'G-7G9HS8437V', {
      'page_variation_name': 'A'
    });
  }

  const eventsSent = [];

  function gaEventTrigger(config, url) {
    const elementId = (event && event.currentTarget) ? event.currentTarget.id : null;
    if (elementId && eventsSent.includes(elementId) && url) {
      return;
    }

    let outboundParams = {};
    if (url) {
      outboundParams = {
        'transport_type': 'beacon',
        'event_callback': function(){ document.location = url; }
      };
    } else {
      outboundParams = { 'transport_type': 'beacon' };
    }

    try {
      const eventConfig = JSON.parse(atob(config));
      eventsSent.push(elementId);

      const parameters = eventConfig.parameters.reduce((acc, p) => ({...acc, [p.name]: p.value}), {});
      gtag('event', eventConfig.event_name, { ...parameters, ...outboundParams });
    } catch (error) {
      console.debug('Custom event send failure');
    }
  }

  setupGA4();