(function ($) {

"use strict";

/**
 * Retrieves the summary for the first element.
 */
$.fn.drupalGetSummary = function () {
  var callback = this.data('summaryCallback');
  return (this[0] && callback) ? $.trim(callback(this[0])) : '';
};

/**
 * Sets the summary for all matched elements.
 *
 * @param callback
 *   Either a function that will be called each time the summary is
 *   retrieved or a string (which is returned each time).
 */
$.fn.drupalSetSummary = function (callback) {
  var self = this;

  // To facilitate things, the callback should always be a function. If it's
  // not, we wrap it into an anonymous function which just returns the value.
  if (typeof callback !== 'function') {
    var val = callback;
    callback = function () { return val; };
  }

  return this
    .data('summaryCallback', callback)
    // To prevent duplicate events, the handlers are first removed and then
    // (re-)added.
    .off('formUpdated.summary')
    .on('formUpdated.summary', function () {
      self.trigger('summaryUpdated');
    })
    // The actual summaryUpdated handler doesn't fire when the callback is
    // changed, so we have to do this manually.
    .trigger('summaryUpdated');
};

/**
 * Sends a 'formUpdated' event each time a form element is modified.
 */
Drupal.behaviors.formUpdated = {
  attach: function (context) {
    // These events are namespaced so that we can remove them later.
    var events = 'change.formUpdated click.formUpdated blur.formUpdated keyup.formUpdated';
    $(context)
      // Since context could be an input element itself, it's added back to
      // the jQuery object and filtered again.
      .find(':input').addBack().filter(':input')
      // To prevent duplicate events, the handlers are first removed and then
      // (re-)added.
      .off(events).on(events, function () {
        $(this).trigger('formUpdated');
      });
  }
};

/**
 * Prepopulate form fields with information from the visitor cookie.
 */
Drupal.behaviors.fillUserInfoFromCookie = {
  attach: function (context, settings) {
    var userInfo = ['name', 'mail', 'homepage'];
    $('form.user-info-from-cookie').once('user-info-from-cookie', function () {
      var $formContext = $(this);
      var i, il, $element, cookie;
      for (i = 0, il = userInfo.length; i < il; i += 1) {
        $element = $formContext.find('[name=' + userInfo[i] + ']');
        cookie = $.cookie('Drupal.visitor.' + userInfo[i]);
        if ($element.length && cookie) {
          $element.val(cookie);
        }
      }
    });
  }
};

})(jQuery);