(function (settings) {
  var appendQuery = function appendQuery(url, query) {
    if (0 === query.length) {
      return url;
    }
    if ('?' == query.charAt(0)) {
      query = query.substring(1);
    }
    var separator = (-1 !== url.indexOf('?')) ? '&' : '?';
    return url + separator + query;
  };

  var shouldLoadThankYouPage = function() {
    var queryParams = window.location.search.substr(1).split('&').reduce(function (q, query) {
      var chunks = query.split('=');
      var key = chunks[0];
      var value = chunks[1];
      return (q[key] = value, q);
    }, {});
    return queryParams['nm-embed-show-thank-you'] === '1';
  };

  var firstScriptElement = document.getElementsByTagName('script')[0];

  if (settings.share_progress_js_url) {
    var scriptElementSP = document.createElement('script');
    scriptElementSP.async = 1;
    scriptElementSP.src = settings.share_progress_js_url;
    firstScriptElement.parentNode.insertBefore(scriptElementSP,firstScriptElement);
  }

  if (settings.pym_lib_url) {
    var scriptElement = document.createElement('script');
    scriptElement.async = 1;
    scriptElement.src = settings.pym_lib_url;
    firstScriptElement.parentNode.insertBefore(scriptElement,firstScriptElement);
    scriptElement.onload = function () {
      if (settings.div_id && settings.iframe_url) {
        var url = appendQuery(settings.iframe_url, document.location.search);

        if (shouldLoadThankYouPage() && settings.thank_you_url) {
          url = appendQuery(settings.thank_you_url, document.location.search);
        }

        var pymParent = new pym.Parent(settings.div_id, url, {});

        // Allow child to learn about parent URL, for cases where iframe content has navigated away from original URL with parentUrl parameter.
        pymParent.onMessage('getParentUrl', function() {
          this.sendMessage('parentUrl', encodeURIComponent(window.location.href));
        });

        // pym.js sets the iframe height via the HTML "height" attribute, which
        // can get overridden by (unrelated) CSS rules. So, in addition, we also
        // set the CSS "height" property directly on the iframe, which in turn
        // overrides any CSS applied via rules.
        pymParent.onMessage('height', function(message) {
          var height = parseInt(message);
          if ('style' in this.iframe) {
            if ('height' in this.iframe.style) {
              this.iframe.style.height = height + 'px';
            }
          }
        });
      }
    };
  }

  if (settings.font_url) {
    var head = document.head || document.getElementsByTagName('head')[0],
        link = document.createElement('link');
    link.setAttribute('rel', 'stylesheet');
    link.setAttribute('type', 'text/css');
    link.setAttribute('href', settings.font_url);
    head.appendChild(link);
  }
  // Do not append anything after the closing parenthesis!
})({
    "pym_lib_url": "//engage.newmode.net/profiles/newmode/libraries/pym/pym.js",
    "share_progress_js_url": "//c.shpg.org/392/sp.js",
    "div_id": "newmode-embed-4348-4757",
    "iframe_url": "//engage.newmode.net/nm-letter/4348/4757",
    "font_url": "",
    "thank_you_url": "https://engage.newmode.net/node/4757/done"
});