// $Id$
(function ($) {

/**
 * Retrieves the summary for the first element.
 */
$.fn.getSummary = 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.setSummary = function (callback) {
  var that = 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.
    .unbind('formUpdated.summary')
    .bind('formUpdated.summary', function () {
      that.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').andSelf().filter(':input')
      // To prevent duplicate events, the handlers are first removed and then
      // (re-)added.
      .unbind(events).bind(events, function () {
        $(this).trigger('formUpdated');
      });
  }
};

Drupal.behaviors.multiselectSelector = {
  attach: function (context, settings) {
    // Automatically selects the right radio button in a multiselect control.
    $('.multiselect select:not(.multiselectSelector-processed)', context)
      .addClass('multiselectSelector-processed').change(function () {
        $('.multiselect input:radio[value="' + this.id.substr(5) + '"]')
          .attr('checked', true);
    });
  }
};


/**
 * Automatically display the guidelines of the selected text format.
 */
Drupal.behaviors.filterGuidelines = {
  attach: function (context) {
    $('.filter-guidelines:not(.filter-guidelines-processed)', context)
      .addClass('filter-guidelines-processed')
      .find('label').hide()
      .parents('.filter-wrapper').find('select.filter-list')
      .bind('change', function () {
        $(this).parents('.filter-wrapper')
          .find('.filter-guidelines-item').hide()
          .siblings('#filter-guidelines-' + this.value).show();
      })
      .change();
  }
};

})(jQuery);