<script>
(function() {
  /* ==== MULTIVARIATE TEST SETUP ==== */
  /* 
     ✅ Update the following values for your test:
     1. testCode        → Unique test identifier (must be unique per test!)
     2. testVersion     → Optional version tag to prevent conflicts when re-running a test
     3. variants        → Total number of variants (e.g. 4 = control + 3 variations)
     4. testInclusionRate → Between 0 and 1 (e.g. 1 = 100%)
     5. Define your control() and variationX() functions below
  */

  var testCode = 'AAA001'; // Unique code for this test
  var testVersion = 'v1';  // Change this if you re-run the same test later
  var variants = 4;
  var testInclusionRate = 1;
  var cookieDays = 7;

  // ==== VARIATION FUNCTIONS ====
  window.control = function () {
    console.log(testCode + ' Control Running');
    // Your control logic here
  };
  
  window.variation1 = function () {
    console.log(testCode + ' Variation 1 Running');
    // Your variation 1 logic here
  };

  window.variation2 = function () {
    console.log(testCode + ' Variation 2 Running');
    // Your variation 2 logic here
  };

  window.variation3 = function () {
    console.log(testCode + ' Variation 3 Running');
    // Your variation 3 logic here
  };

  // ==== DO NOT EDIT BELOW THIS LINE ====

  var cookieKey = testCode + '_' + testVersion;

  function setCookie(name, value, days) {
    var expires = new Date();
    expires.setTime(expires.getTime() + (days * 24 * 60 * 60 * 1000));
    document.cookie = name + '=' + encodeURIComponent(value) + '; expires=' + expires.toUTCString() + '; path=/; SameSite=Lax';
  }

  function getCookie(name) {
    var match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
    return match ? decodeURIComponent(match[2]) : null;
  }

  var urlParams = (function () {
    var params = {};
    var query = window.location.search.substring(1);
    var pairs = query.split("&");
    for (var i = 0; i < pairs.length; i++) {
      var parts = pairs[i].split("=");
      if (parts.length === 2) {
        params[decodeURIComponent(parts[0])] = decodeURIComponent(parts[1]);
      }
    }
    return params;
  })();

  var forcedVariant = urlParams['mvt'];

  function runVariant(variantName) {
    console.log(testCode + ': Running ' + variantName);

    window.dataLayer = window.dataLayer || [];
    window.dataLayer.push({
      event: 'MVT Test',
      eventCategory: 'MVT Test',
      eventAction: testCode,
      eventLabel: testCode + ' ' + variantName
    });

    setCookie(cookieKey, variantName, cookieDays);

    if (typeof window[variantName] === 'function') {
      window[variantName]();
    } else {
      console.warn('No function defined for ' + variantName);
    }

    if (typeof window.dispatchEvent === 'function') {
      window.dispatchEvent(new Event('mvt-loaded'));
    }
  }

  var existing = getCookie(cookieKey);

  if (forcedVariant) {
    runVariant(forcedVariant.toLowerCase());
  } else if (existing) {
    runVariant(existing);
  } else if (Math.random() < testInclusionRate) {
    var index = Math.floor(Math.random() * variants);
    var variantName = index === 0 ? 'control' : 'variation' + index;
    runVariant(variantName);
  } else {
    console.log(testCode + ': User not included in test');
  }

  // === ✅ Console credit ===
  console.log('Code on this page was developed by www.netimpression.co.uk 🚀');

})();
</script>