<script>
(function() {
  'use strict';

  // SHA256 Hashing Utility Function for PII Protection
  async function sha256(message) {
    if (!message) return '';
    var cleanMsg = message.toString().trim().toLowerCase();
    var msgBuffer = new TextEncoder().encode(cleanMsg);
    var hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer);
    var hashArray = Array.from(new Uint8Array(hashBuffer));
    return hashArray.map(function(b) {
      return b.toString(16).padStart(2, '0');
    }).join('');
  }

  // Generic Form Submission Listener
  document.addEventListener('submit', async function(event) {
    var form = event.target;
    
    // Extract Form Fields (Adjust querySelectors based on your CRM form markup)
    var emailElem = form.querySelector('input[type="email"], input[name*="email"]');
    var phoneElem = form.querySelector('input[type="tel"], input[name*="phone"]');
    var fnElem = form.querySelector('input[name*="first_name"], input[name*="fname"]');
    var lnElem = form.querySelector('input[name*="last_name"], input[name*="lname"]');

    var rawEmail = emailElem ? emailElem.value : '';
    var rawPhone = phoneElem ? phoneElem.value : '';
    var rawFn = fnElem ? fnElem.value : '';
    var rawLn = lnElem ? lnElem.value : '';

    // Only process if basic contact details exist
    if (rawEmail || rawPhone) {
      // Normalize Phone Number (E.164 standard formatting prep)
      var cleanPhone = rawPhone.replace(/\D/g, '');

      // Generate SHA256 Hashes for Meta CAPI & Google Ads Advanced Matching
      var hashedEmail = rawEmail ? await sha256(rawEmail) : '';
      var hashedPhone = cleanPhone ? await sha256(cleanPhone) : '';
      var hashedFn = rawFn ? await sha256(rawFn) : '';
      var hashedLn = rawLn ? await sha256(rawLn) : '';

      // Persistent First-Party User ID
      var externalId = localStorage.getItem('user_external_id');
      if (!externalId) {
        externalId = 'usr_' + Math.random().toString(36).substring(2, 11) + Date.now();
        localStorage.setItem('user_external_id', externalId);
      }

      // Retrieve Auto-Captured Contextual Data from localStorage
      var geoCountry = localStorage.getItem('user_geo_country') || '';
      var geoRegion = localStorage.getItem('user_geo_region') || '';
      var geoCity = localStorage.getItem('user_geo_city') || '';
      var geoPostal = localStorage.getItem('user_geo_postal') || '';
      var fbp = localStorage.getItem('tracking_fbp') || '';
      var fbc = localStorage.getItem('tracking_fbc') || '';
      var gclid = localStorage.getItem('tracking_gclid') || '';
      var fbclid = localStorage.getItem('tracking_fbclid') || '';

      // Push Universal Enriched Event into Data Layer
      window.dataLayer = window.dataLayer || [];
      window.dataLayer.push({
        'event': 'enriched_lead_submission',
        'user_data': {
          'email_raw': rawEmail,
          'email_hashed': hashedEmail,
          'phone_raw': rawPhone,
          'phone_hashed': hashedPhone,
          'first_name_hashed': hashedFn,
          'last_name_hashed': hashedLn,
          'external_id': externalId,
          'fbp': fbp,
          'fbc': fbc,
          'gclid': gclid,
          'fbclid': fbclid,
          'geo_country': geoCountry,
          'geo_region': geoRegion,
          'geo_city': geoCity,
          'geo_postal': geoPostal
        }
      });
    }
  }, true);
})();
</script>