(function() {

  const CONSENT_KEY = "chumbay_cookie_consent_v1";

  // --- always create dataLayer BEFORE loading GTM ---
  window.dataLayer = window.dataLayer || [];
  function gtag(){ dataLayer.push(arguments); }

  // --- default consent: BLOCK analytics & ads ---
  gtag('consent', 'default', {
    analytics_storage: 'denied',
    ad_storage: 'denied',
    ad_user_data: 'denied',
    ad_personalization: 'denied'
  });

  // --- GTM loader: identical to your GTM snippet ---
  function loadGTM() {
    if (window.gtmLoaded) return;
    window.gtmLoaded = true;

    (function(w,d,s,l,i){
      w[l]=w[l]||[];
      w[l].push({'gtm.start': new Date().getTime(), event:'gtm.js'});
      var f=d.getElementsByTagName(s)[0],
          j=d.createElement(s),
          dl=l!='dataLayer'?'&l='+l:'';
      j.async=true;
      j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;
      f.parentNode.insertBefore(j,f);
    })(window,document,'script','dataLayer','GTM-T6MGSN59');
  }

  // --- allow analytics ---
  function grantConsent() {
    gtag('consent', 'update', {
      analytics_storage: 'granted',
      ad_storage: 'granted',
      ad_user_data: 'granted',
      ad_personalization: 'granted'
    });
  }

  // --- restore previous consent ---
  const saved = localStorage.getItem(CONSENT_KEY);
  if (saved) {
    const c = JSON.parse(saved);
    if (c.analytics || c.marketing) {
      grantConsent();
      loadGTM();
    }
  } else {
    document.getElementById("cookie-banner").style.display = "block";
  }

  // Accept All
  document.getElementById("cookie-accept-all").onclick = function() {
    save();
  };
  function save() {
    localStorage.setItem(CONSENT_KEY, JSON.stringify({
      necessary: true,
      analytics: true,
      marketing: true
    }));
    grantConsent();
    loadGTM();
    document.getElementById("cookie-banner").style.display = "none";
  }

  // Only necessary
  document.getElementById("cookie-accept-necessary").onclick = function() {
    localStorage.setItem(CONSENT_KEY, JSON.stringify({
      necessary: true,
      analytics: false,
      marketing: false
    }));
    document.getElementById("cookie-banner").style.display = "none";
  };

  // custom settings toggle
  document.getElementById("cookie-settings").onclick = function() {
    const panel = document.getElementById("cookie-settings-panel");
    panel.style.display = panel.style.display === "none" ? "block" : "none";
  };

  document.getElementById("cookie-save-settings").onclick = function() {
    const analytics = document.getElementById("consent-analytics").checked;
    const marketing = document.getElementById("consent-marketing").checked;

    localStorage.setItem(CONSENT_KEY, JSON.stringify({
      necessary: true,
      analytics,
      marketing
    }));

    if (analytics || marketing) {
      grantConsent();
      loadGTM();
    }

    document.getElementById("cookie-banner").style.display = "none";
  };

})();