(function() {
  const messageId = Math.random().toString(36).substring(2);
  window.addEventListener('message', function(event) {
    if (event.data.source === 'blueConicExtension' && event.data.action === 'getTenantIfBcScriptRequiredResponse' && event.data.messageId === messageId) {
      clearInterval(interval);
      
      // Note that if the content script determines we should not load the BC script, this will be null.
      const tenant = event.data.tenant;
      if (tenant) {
        console.log('-----------------------------------------------------------------');
        console.log('- BlueConic Extension: Adding BlueConic script for tenant', tenant, 'in', document.location.href, window.name);
        console.log('-----------------------------------------------------------------');
        
        var bcScript = document.createElement('script');
        bcScript.async = true;
        bcScript.src = tenant + '/frontend/static/javascript/blueconic/blueconic.min.js?source=blueconic-browser-extension';
        var containerNode = document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0];
        if (containerNode.childNodes.length > 0) {
          containerNode.insertBefore(bcScript, containerNode.childNodes[0]);
        } else {
          containerNode.appendChild(bcScript);
        }
      }
    }
  });

  const maxAttemptsCount = 10;
  let attemptsCount = 0;
  let interval = setInterval(() => {
    attemptsCount += 1;

    if (attemptsCount > maxAttemptsCount) {
      clearInterval(interval);
    }

    window.postMessage(
      {
        source: 'blueConicExtension',
        action: 'getTenantIfBcScriptRequiredRequest',
        messageId
      },
      window.location.origin
    );
  }, 250);
}());