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/**
 * @file
 * Attaches several event listener to a web page (debugging version).
 */

(function ($, Drupal, drupalSettings) {

  /* eslint no-console: 0, max-nested-callbacks: ["error", 4] */

  'use strict';

  Drupal.google_analytics = {};

  $(document).ready(function () {

    // Attach mousedown, keyup, touchstart events to document only and catch
    // clicks on all elements.
    $(document.body).on('mousedown keyup touchstart', function (event) {
      console.group('Running Google Analytics for Drupal.');
      console.info("Event '%s' has been detected.", event.type);

      // Catch the closest surrounding link of a clicked element.
      $(event.target).closest('a,area').each(function () {
        console.info("Closest element '%o' has been found. URL '%s' extracted.", this, this.href);

        // Is the clicked URL internal?
        if (Drupal.google_analytics.isInternal(this.href)) {
          // Skip 'click' tracking, if custom tracking events are bound.
          if ($(this).is('.colorbox') && (drupalSettings.google_analytics.trackColorbox)) {
            // Do nothing here. The custom event will handle all tracking.
            console.info('Click on .colorbox item has been detected.');
          }
          // Is download tracking activated and the file extension configured
          // for download tracking?
          else if (drupalSettings.google_analytics.trackDownload && Drupal.google_analytics.isDownload(this.href)) {
            // Download link clicked.
            console.info("Download url '%s' has been found. Tracked download as extension '%s'.", Drupal.google_analytics.getPageUrl(this.href), Drupal.google_analytics.getDownloadExtension(this.href).toUpperCase());
            gtag('event', Drupal.google_analytics.getDownloadExtension(this.href).toUpperCase(), {
              event_category: 'Downloads',
              event_label: Drupal.google_analytics.getPageUrl(this.href),
              transport_type: 'beacon'
            });
          }
          else if (Drupal.google_analytics.isInternalSpecial(this.href)) {
            // Keep the internal URL for Google Analytics website overlay intact.
            console.info("Click on internal special link '%s' has been tracked.", Drupal.google_analytics.getPageUrl(this.href));
            // @todo: May require tracking ID
            gtag('config', drupalSettings.google_analytics.account, {
              page_path: Drupal.google_analytics.getPageUrl(this.href),
              transport_type: 'beacon'
            });
          }
          else {
            // e.g. anchor in same page or other internal page link.
            console.info("Click on internal link '%s' detected, but not tracked by click.", this.href);
          }
        }
        else {
          if (drupalSettings.google_analytics.trackMailto && $(this).is("a[href^='mailto:'],area[href^='mailto:']")) {
            // Mailto link clicked.
            console.info("Click on e-mail '%s' has been tracked.", this.href.substring(7));
            gtag('event', 'Click', {
              event_category: 'Mails',
              event_label: this.href.substring(7),
              transport_type: 'beacon'
            });
          }
          else if (drupalSettings.google_analytics.trackOutbound && this.href.match(/^\w+:\/\//i)) {
            if (drupalSettings.google_analytics.trackDomainMode !== 2 || (drupalSettings.google_analytics.trackDomainMode === 2 && !Drupal.google_analytics.isCrossDomain(this.hostname, drupalSettings.google_analytics.trackCrossDomains))) {
              // External link clicked / No top-level cross domain clicked.
              console.info("Outbound link '%s' has been tracked.", this.href);
              gtag('event', 'Click', {
                event_category: 'Outbound links',
                event_label: this.href,
                transport_type: 'beacon'
              });
            }
            else {
              console.info("Internal link '%s' clicked, not tracked.", this.href);
            }
          }
        }
      });

      console.groupEnd();
    });

    // Track hash changes as unique pageviews, if this option has been enabled.
    if (drupalSettings.google_analytics.trackUrlFragments) {
      window.onhashchange = function () {
        console.info("Track URL '%s' as pageview. Hash '%s' has changed.", location.pathname + location.search + location.hash, location.hash);
        gtag('config', drupalSettings.google_analytics.account, {
          page_path: location.pathname + location.search + location.hash
        });
      };
    }

    // Colorbox: This event triggers when the transition has completed and the
    // newly loaded content has been revealed.
    if (drupalSettings.google_analytics.trackColorbox) {
      $(document).on('cbox_complete', function () {
        var href = $.colorbox.element().attr('href');
        if (href) {
          console.info("Colorbox transition to url '%s' has been tracked.", Drupal.google_analytics.getPageUrl(href));
          gtag('config', drupalSettings.google_analytics.account, {
            page_path: Drupal.google_analytics.getPageUrl(href)
          });
        }
      });
    }

  });

  /**
   * Check whether the hostname is part of the cross domains or not.
   *
   * @param {string} hostname
   *   The hostname of the clicked URL.
   * @param {array} crossDomains
   *   All cross domain hostnames as JS array.
   *
   * @return {boolean} isCrossDomain
   */
  Drupal.google_analytics.isCrossDomain = function (hostname, crossDomains) {
    return $.inArray(hostname, crossDomains) > -1 ? true : false;
  };

  /**
   * Check whether this is a download URL or not.
   *
   * @param {string} url
   *   The web url to check.
   *
   * @return {boolean} isDownload
   */
  Drupal.google_analytics.isDownload = function (url) {
    var isDownload = new RegExp('\\.(' + drupalSettings.google_analytics.trackDownloadExtensions + ')([\?#].*)?$', 'i');
    return isDownload.test(url);
  };

  /**
   * Check whether this is an absolute internal URL or not.
   *
   * @param {string} url
   *   The web url to check.
   *
   * @return {boolean} isInternal
   */
  Drupal.google_analytics.isInternal = function (url) {
    var isInternal = new RegExp('^(https?):\/\/' + window.location.host, 'i');
    return isInternal.test(url);
  };

  /**
   * Check whether this is a special URL or not.
   *
   * URL types:
   *  - gotwo.module /go/* links.
   *
   * @param {string} url
   *   The web url to check.
   *
   * @return {boolean} isInternalSpecial
   */
  Drupal.google_analytics.isInternalSpecial = function (url) {
    var isInternalSpecial = new RegExp('(\/go\/.*)$', 'i');
    return isInternalSpecial.test(url);
  };

  /**
   * Extract the relative internal URL from an absolute internal URL.
   *
   * Examples:
   * - https://mydomain.com/node/1 -> /node/1
   * - https://example.com/foo/bar -> https://example.com/foo/bar
   *
   * @param {string} url
   *   The web url to check.
   *
   * @return {string} getPageUrl
   *   Internal website URL.
   */
  Drupal.google_analytics.getPageUrl = function (url) {
    var extractInternalUrl = new RegExp('^(https?):\/\/' + window.location.host, 'i');
    return url.replace(extractInternalUrl, '');
  };

  /**
   * Extract the download file extension from the URL.
   *
   * @param {string} url
   *   The web url to check.
   *
   * @return {string} getDownloadExtension
   *   The file extension of the passed url. e.g. 'zip', 'txt'
   */
  Drupal.google_analytics.getDownloadExtension = function (url) {
    var extractDownloadextension = new RegExp('\\.(' + drupalSettings.google_analytics.trackDownloadExtensions + ')([\?#].*)?$', 'i');
    var extension = extractDownloadextension.exec(url);
    return (extension === null) ? '' : extension[1];
  };

})(jQuery, Drupal, drupalSettings);