(function($) {

/**
 * Initialize editor libraries.
 *
 * Some editors need to be initialized before the DOM is fully loaded. The
 * init hook gives them a chance to do so.
 */
Drupal.wysiwygInit = function() {
  // This breaks in Konqueror. Prevent it from running.
  if (/KDE/.test(navigator.vendor)) {
    return;
  }

  jQuery.each(Drupal.wysiwyg.editor.init, function(editor) {
    // Clone, so original settings are not overwritten.
    this(jQuery.extend(true, {}, Drupal.settings.wysiwyg.configs[editor]));
  });
};

/**
 * Attach editors to input formats and target elements (f.e. textareas).
 *
 * This behavior searches for input format selectors and formatting guidelines
 * that have been preprocessed by Wysiwyg API. All CSS classes of those elements
 * with the prefix 'wysiwyg-' are parsed into input format parameters, defining
 * the input format, configured editor, target element id, and variable other
 * properties, which are passed to the attach/detach hooks of the corresponding
 * editor.
 *
 * Furthermore, an "enable/disable rich-text" toggle link is added after the
 * target element to allow users to alter its contents in plain text.
 *
 * This is executed once, while editor attach/detach hooks can be invoked
 * multiple times.
 *
 * @param context
 *   A DOM element, supplied by Drupal.attachBehaviors().
 */
Drupal.behaviors.attachWysiwyg = function(context) {
  // This breaks in Konqueror. Prevent it from running.
  if (/KDE/.test(navigator.vendor)) {
    return;
  }

  $('.wysiwyg:not(.wysiwyg-processed)', context).each(function() {
    var params = Drupal.wysiwyg.getParams(this);
    var $this = $(this).addClass('wysiwyg-processed');
    // Directly attach this editor, if the input format is enabled or there is
    // only one input format at all.
    if (($this.is(':input') && $this.is(':checked')) || $this.is('div')) {
      Drupal.wysiwygAttach(context, params);
    }
    // Attach onChange handlers to input format selector elements.
    if ($this.is(':input')) {
      $this.change(function() {
        // If not disabled, detach the current and attach a new editor.
        Drupal.wysiwygDetach(context, params);
        Drupal.wysiwygAttach(context, params);
      });
      // IE triggers onChange after blur only.
      if ($.browser.msie) {
        $this.click(function () {
          this.blur();
        });
      }
    }
    // Detach any editor when the containing form is submitted.
    $('#' + params.field).parents('form').submit(function (event) {
      // Do not detach if the event was cancelled.
      if (event.originalEvent.returnValue === false) {
        return;
      }
      Drupal.wysiwygDetach(context, params);
    });
  });
};

/**
 * Attach an editor to a target element.
 *
 * This tests whether the passed in editor implements the attach hook and
 * invokes it if available. Editor profile settings are cloned first, so they
 * cannot be overridden. After attaching the editor, the toggle link is shown
 * again, except in case we are attaching no editor.
 *
 * @param context
 *   A DOM element, supplied by Drupal.attachBehaviors().
 * @param params
 *   An object containing input format parameters.
 */
Drupal.wysiwygAttach = function(context, params) {
  if (typeof Drupal.wysiwyg.editor.attach[params.editor] == 'function') {
    // (Re-)initialize field instance.
    Drupal.wysiwyg.instances[params.field] = {};
    // Provide all input format parameters to editor instance.
    jQuery.extend(Drupal.wysiwyg.instances[params.field], params);
    // Provide editor callbacks for plugins, if available.
    if (typeof Drupal.wysiwyg.editor.instance[params.editor] == 'object') {
      jQuery.extend(Drupal.wysiwyg.instances[params.field], Drupal.wysiwyg.editor.instance[params.editor]);
    }
    // Store this field id, so (external) plugins can use it.
    // @todo Wrong point in time. Probably can only supported by editors which
    //   support an onFocus() or similar event.
    Drupal.wysiwyg.activeId = params.field;
    // Attach or update toggle link, if enabled.
    if (params.toggle) {
      Drupal.wysiwygAttachToggleLink(context, params);
    }
    // Otherwise, ensure that toggle link is hidden.
    else {
      $('#wysiwyg-toggle-' + params.field).hide();
    }
    // Attach editor, if enabled by default or last state was enabled.
    if (params.status) {
      Drupal.wysiwyg.editor.attach[params.editor](context, params, (Drupal.settings.wysiwyg.configs[params.editor] ? jQuery.extend(true, {}, Drupal.settings.wysiwyg.configs[params.editor][params.format]) : {}));
    }
    // Otherwise, attach default behaviors.
    else {
      Drupal.wysiwyg.editor.attach.none(context, params);
      Drupal.wysiwyg.instances[params.field].editor = 'none';
    }
  }
};

/**
 * Detach all editors from a target element.
 *
 * @param context
 *   A DOM element, supplied by Drupal.attachBehaviors().
 * @param params
 *   An object containing input format parameters.
 */
Drupal.wysiwygDetach = function(context, params) {
  var editor = Drupal.wysiwyg.instances[params.field].editor;
  if (jQuery.isFunction(Drupal.wysiwyg.editor.detach[editor])) {
    Drupal.wysiwyg.editor.detach[editor](context, params);
  }
};

/**
 * Append or update an editor toggle link to a target element.
 *
 * @param context
 *   A DOM element, supplied by Drupal.attachBehaviors().
 * @param params
 *   An object containing input format parameters.
 */
Drupal.wysiwygAttachToggleLink = function(context, params) {
  if (!$('#wysiwyg-toggle-' + params.field).length) {
    var text = document.createTextNode(params.status ? Drupal.settings.wysiwyg.disable : Drupal.settings.wysiwyg.enable);
    var a = document.createElement('a');
    $(a).attr({ id: 'wysiwyg-toggle-' + params.field, href: 'javascript:void(0);' }).append(text);
    var div = document.createElement('div');
    $(div).addClass('wysiwyg-toggle-wrapper').append(a);
    $('#' + params.field).after(div);
  }
  $('#wysiwyg-toggle-' + params.field)
    .html(params.status ? Drupal.settings.wysiwyg.disable : Drupal.settings.wysiwyg.enable).show()
    .unbind('click.wysiwyg', Drupal.wysiwyg.toggleWysiwyg)
    .bind('click.wysiwyg', { params: params, context: context }, Drupal.wysiwyg.toggleWysiwyg);

  // Hide toggle link in case no editor is attached.
  if (params.editor == 'none') {
    $('#wysiwyg-toggle-' + params.field).hide();
  }
};

/**
 * Callback for the Enable/Disable rich editor link.
 */
Drupal.wysiwyg.toggleWysiwyg = function (event) {
  var context = event.data.context;
  var params = event.data.params;
  if (params.status) {
    // Detach current editor.
    params.status = false;
    Drupal.wysiwygDetach(context, params);
    // After disabling the editor, re-attach default behaviors.
    // @todo We HAVE TO invoke Drupal.wysiwygAttach() here.
    Drupal.wysiwyg.editor.attach.none(context, params);
    Drupal.wysiwyg.instances[params.field] = Drupal.wysiwyg.editor.instance.none;
    Drupal.wysiwyg.instances[params.field].editor = 'none';
    $(this).html(Drupal.settings.wysiwyg.enable).blur();
  }
  else {
    // Before enabling the editor, detach default behaviors.
    Drupal.wysiwyg.editor.detach.none(context, params);
    // Attach new editor using parameters of the currently selected input format.
    Drupal.wysiwyg.getParams($('.wysiwyg-field-' + params.field + ':checked, div.wysiwyg-field-' + params.field, context).get(0), params);
    params.status = true;
    Drupal.wysiwygAttach(context, params);
    $(this).html(Drupal.settings.wysiwyg.disable).blur();
  }
}

/**
 * Parse the CSS classes of an input format DOM element into parameters.
 *
 * Syntax for CSS classes is "wysiwyg-name-value".
 *
 * @param element
 *   An input format DOM element containing CSS classes to parse.
 * @param params
 *   (optional) An object containing input format parameters to update.
 */
Drupal.wysiwyg.getParams = function(element, params) {
  var classes = element.className.split(' ');
  var params = params || {};
  for (var i = 0; i < classes.length; i++) {
    if (classes[i].substr(0, 8) == 'wysiwyg-') {
      var parts = classes[i].split('-');
      var value = parts.slice(2).join('-');
      params[parts[1]] = value;
    }
  }
  // Convert format id into string.
  params.format = 'format' + params.format;
  // Convert numeric values.
  params.status = parseInt(params.status, 10);
  params.toggle = parseInt(params.toggle, 10);
  params.resizable = parseInt(params.resizable, 10);
  return params;
};

/**
 * Allow certain editor libraries to initialize before the DOM is loaded.
 */
Drupal.wysiwygInit();

})(jQuery);
