class RulesPluginUI

class RulesPluginUI extends FacesExtender implements RulesPluginUIInterface {
  
  /**
   * @var RulesPlugin
   */
  protected $element;
  
  /**
   * The base path determines where a Rules overview UI lives.
   *
   * All forms that want to display Rules (overview) forms need to set this
   * variable. This is necessary in order to get correct operation links,
   * paths, redirects, breadcrumbs, etc. for the form() and overviewTable()
   * methods.
   *
   * @see RulesUIController
   * @see rules_admin_reaction_overview()
   * @see rules_admin_components_overview()
   */
  public static $basePath = NULL;
  
  /**
   * Provide $this->element to make the code more meaningful.
   */
  public function __construct(FacesExtendable $object) {
    parent::__construct($object);
    $this->element = $object;
  }
  
  /**
   * Returns the state values for $form, possibly only a part of the whole form.
   *
   * In case the form is embedded somewhere, this function figures out the
   * location of its form values and returns them for further use.
   *
   * @param array $form
   *   A form array, or an array of form elements to get the value for.
   * @param array $form_state
   *   The form state as usual.
   */
  public static function &getFormStateValues($form, &$form_state) {
    $values = NULL;
    if (isset($form_state['values'])) {
      // Assume the top level if parents are not yet set.
      $form += array(
        '#parents' => array(),
      );
      $values =& $form_state['values'];
      foreach ($form['#parents'] as $parent) {
        $values =& $values[$parent];
      }
    }
    return $values;
  }
  
  /**
   * Implements RulesPluginUIInterface::form().
   *
   * Generates the element edit form.
   * Note: Make sure that you set RulesPluginUI::$basePath before using this
   * method, otherwise paths, links, redirects etc. won't be correct.
   */
  public function form(&$form, &$form_state, $options = array()) {
    self::formDefaults($form, $form_state);
    $form_state += array(
      'rules_element' => $this->element,
    );
    // Add the help to the top of the form.
    $help = $this->element
      ->help();
    $form['help'] = is_array($help) ? $help : array(
      '#markup' => $help,
    );
    // We use $form_state['element_settings'] to store the settings of both
    // parameter modes. That way one can switch between the parameter modes
    // without losing the settings of those.
    $form_state += array(
      'element_settings' => $this->element->settings,
    );
    $settings = $this->element->settings + $form_state['element_settings'];
    $form['parameter'] = array(
      '#tree' => TRUE,
    );
    foreach ($this->element
      ->pluginParameterInfo() as $name => $parameter) {
      if ($parameter['type'] == 'hidden') {
        continue;
      }
      $form['parameter'][$name] = array(
        '#type' => 'fieldset',
        '#title' => check_plain($parameter['label']),
        '#description' => filter_xss(isset($parameter['description']) ? $parameter['description'] : ''),
      );
      // Init the parameter input mode.
      $form_state['parameter_mode'][$name] = !isset($form_state['parameter_mode'][$name]) ? NULL : $form_state['parameter_mode'][$name];
      $form['parameter'][$name] += $this->getParameterForm($name, $parameter, $settings, $form_state['parameter_mode'][$name]);
    }
    // Provide a form for editing the label and name of provided variables.
    $settings = $this->element->settings;
    foreach ($this->element
      ->pluginProvidesVariables() as $var_name => $var_info) {
      $form['provides'][$var_name] = array(
        '#type' => 'fieldset',
        '#title' => check_plain($var_info['label']),
        '#description' => filter_xss(isset($var_info['description']) ? $var_info['description'] : ''),
      );
      $form['provides'][$var_name]['label'] = array(
        '#type' => 'textfield',
        '#title' => t('Variable label'),
        '#default_value' => isset($settings[$var_name . ':label']) ? $settings[$var_name . ':label'] : $var_info['label'],
        '#required' => TRUE,
      );
      $form['provides'][$var_name]['var'] = array(
        '#type' => 'textfield',
        '#title' => t('Variable name'),
        '#default_value' => isset($settings[$var_name . ':var']) ? $settings[$var_name . ':var'] : $var_name,
        '#description' => t('The variable name must contain only lowercase letters, numbers, and underscores and must be unique in the current scope.'),
        '#element_validate' => array(
          'rules_ui_element_machine_name_validate',
        ),
        '#required' => TRUE,
      );
    }
    if (!empty($form['provides'])) {
      $help = '<div class="description">' . t('Adjust the names and labels of provided variables, but note that renaming of already utilized variables invalidates the existing uses.') . '</div>';
      $form['provides'] += array(
        '#tree' => TRUE,
        '#prefix' => '<h4 class="rules-form-heading">' . t('Provided variables') . '</h4>' . $help,
      );
    }
    // Add settings form, if specified.
    if (!empty($options['show settings'])) {
      $this->settingsForm($form, $form_state);
    }
    // Add submit button, if specified.
    if (!empty($options['button'])) {
      $form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Save'),
        '#weight' => 10,
      );
    }
  }
  
  /**
   * Actually generates the parameter form for the given data type.
   */
  protected function getParameterForm($name, $info, $settings, &$mode) {
    $class = $this->getDataTypeClass($info['type'], $info);
    $supports_input_mode = in_array('RulesDataDirectInputFormInterface', class_implements($class));
    // Init the mode.
    if (!isset($mode)) {
      if (isset($settings[$name . ':select'])) {
        $mode = 'selector';
      }
      elseif (isset($settings[$name]) && $supports_input_mode) {
        $mode = 'input';
      }
      elseif (isset($info['restriction'])) {
        $mode = $info['restriction'];
      }
      else {
        // Allow the parameter to define the 'default mode' and fallback to the
        // data type default.
        $mode = !empty($info['default mode']) ? $info['default mode'] : call_user_func(array(
          $class,
          'getDefaultMode',
        ));
      }
    }
    // For translatable parameters, pre-populate an internal translation source
    // key so data type forms or input evaluators (i18n) may show a suitable
    // help message.
    if (drupal_multilingual() && !empty($info['translatable'])) {
      $parameter = $this->element
        ->pluginParameterInfo();
      $info['custom translation language'] = !empty($parameter['language']);
    }
    // Add the parameter form.
    if ($mode == 'input' && $supports_input_mode) {
      $form['settings'] = call_user_func(array(
        $class,
        'inputForm',
      ), $name, $info, $settings, $this->element);
    }
    else {
      $form['settings'] = call_user_func(array(
        $class,
        'selectionForm',
      ), $name, $info, $settings, $this->element);
    }
    // Add a link for switching the input mode when JS is enabled and a button
    // to switch it without JavaScript, in case switching is possible.
    if ($supports_input_mode && empty($info['restriction'])) {
      $value = $mode == 'selector' ? t('Switch to the direct input mode') : t('Switch to data selection');
      $form['switch_button'] = array(
        '#type' => 'submit',
        '#name' => 'param_' . $name,
        '#attributes' => array(
          'class' => array(
            'rules-switch-button',
          ),
        ),
        '#parameter' => $name,
        '#value' => $value,
        '#submit' => array(
          'rules_ui_parameter_replace_submit',
        ),
        '#ajax' => rules_ui_form_default_ajax('none'),
        // Do not validate!
'#limit_validation_errors' => array(),
      );
    }
    return $form;
  }
  
  /**
   * Implements RulesPluginUIInterface.
   */
  public function form_validate($form, &$form_state) {
    $this->form_extract_values($form, $form_state);
    $form_values = RulesPluginUI::getFormStateValues($form, $form_state);
    if (isset($form_values['provides'])) {
      $vars = $this->element
        ->availableVariables();
      foreach ($form_values['provides'] as $name => $values) {
        if (isset($vars[$values['var']])) {
          form_error($form['provides'][$name]['var'], t('The variable name %name is already taken.', array(
            '%name' => $values['var'],
          )));
        }
      }
    }
    // Settings have been updated, so process them now.
    $this->element
      ->processSettings(TRUE);
    // Make sure the current user really has access to configure this element
    // as well as the used input evaluators and data processors.
    if (!user_access('bypass rules access') && !$this->element
      ->root()
      ->access()) {
      form_set_error('', t('Access violation! You have insufficient access permissions to edit this configuration.'));
    }
    if (!empty($form['settings'])) {
      $this->settingsFormValidate($form, $form_state);
    }
  }
  
  /**
   * Applies the values of the form to the element.
   */
  public function form_extract_values($form, &$form_state) {
    $this->element->settings = array();
    $form_values = RulesPluginUI::getFormStateValues($form, $form_state);
    if (isset($form_values['parameter'])) {
      foreach ($form_values['parameter'] as $name => $values) {
        $this->element->settings += $values['settings'];
      }
    }
    if (isset($form_values['provides'])) {
      foreach ($form_values['provides'] as $name => $values) {
        $this->element->settings[$name . ':label'] = $values['label'];
        $this->element->settings[$name . ':var'] = $values['var'];
      }
    }
    if (!empty($form['settings'])) {
      $this->settingsFormExtractValues($form, $form_state);
    }
  }
  
  /**
   * Implements RulesPluginUIInterface.
   */
  public function form_submit($form, &$form_state) {
    // Need to save the element first, before trying to set the component
    // permissions in settingsFormSubmit(), because hook_permission() needs
    // to be able to load the modified element from the DB in order to work
    // properly.
    // @see https://www.drupal.org/project/rules/issues/2340505
    $this->element
      ->save();
    if (!empty($form['settings'])) {
      $this->settingsFormSubmit($form, $form_state);
    }
  }
  
  /**
   * Adds the configuration settings form (label, tags, description, ...).
   */
  public function settingsForm(&$form, &$form_state) {
    $form_values = RulesPluginUI::getFormStateValues($form, $form_state);
    // Add the settings in a separate fieldset below.
    $form['settings'] = array(
      '#type' => 'fieldset',
      '#title' => t('Settings'),
      '#collapsible' => TRUE,
      '#collapsed' => empty($form_values['settings']['vars']['more']),
      '#weight' => 5,
      '#tree' => TRUE,
    );
    $form['settings']['label'] = array(
      '#type' => 'textfield',
      '#title' => t('Name'),
      '#default_value' => $this->element
        ->label(),
      '#required' => TRUE,
      '#weight' => -5,
    );
    // @todo For Drupal 8 use "owner" for generating machine names and
    // module only for the modules providing default configurations.
    if (!empty($this->element->module) && !empty($this->element->name) && $this->element->module == 'rules' && strpos($this->element->name, 'rules_') === 0) {
      // Remove the Rules module prefix from the machine name.
      $machine_name = substr($this->element->name, strlen($this->element->module) + 1);
    }
    else {
      $machine_name = $this->element->name;
    }
    $form['settings']['name'] = array(
      '#type' => 'machine_name',
      '#default_value' => isset($machine_name) ? $machine_name : '',
      // The string 'rules_' is pre-pended to machine names, so the
      // maxlength must be less than the field length of 64 characters.
'#maxlength' => 58,
      '#disabled' => entity_has_status('rules_config', $this->element, ENTITY_IN_CODE) && !(isset($form_state['op']) && $form_state['op'] == 'clone'),
      '#machine_name' => array(
        'exists' => 'rules_config_load',
        'source' => array(
          'settings',
          'label',
        ),
      ),
      '#required' => TRUE,
      '#description' => t('The machine-readable name of this configuration is used by rules internally to identify the configuration. This name must contain only lowercase letters, numbers, and underscores and must be unique.'),
    );
    $form['settings']['tags'] = array(
      '#type' => 'textfield',
      '#title' => t('Tags'),
      '#default_value' => isset($this->element->tags) ? drupal_implode_tags($this->element->tags) : '',
      '#autocomplete_path' => 'admin/config/workflow/rules/autocomplete_tags',
      '#description' => t('Tags associated with this configuration, used for filtering in the admin interface. Separate multiple tags with commas.'),
    );
    // Show a form for editing variables for components.
    if (($plugin_info = $this->element
      ->pluginInfo()) && !empty($plugin_info['component'])) {
      if ($this->element
        ->hasStatus(ENTITY_IN_CODE)) {
        $description = t('The variables used by the component. They can not be edited for configurations that are provided in code.');
      }
      else {
        $description = t('Variables are normally input <em>parameters</em> for the component – data that should be available for the component to act on. Additionally, action components may <em>provide</em> variables back to the caller. Each variable must have a specified data type, a label and a unique machine readable name containing only lowercase alphanumeric characters and underscores. See <a href="@url">the online documentation</a> for more information about variables.', array(
          '@url' => rules_external_help('variables'),
        ));
      }
      $form['settings']['vars'] = array(
        '#prefix' => '<div id="rules-component-variables">',
        '#suffix' => '</div>',
        '#tree' => TRUE,
        '#element_validate' => array(
          'rules_ui_element_variable_form_validate',
        ),
        '#theme' => 'rules_ui_variable_form',
        '#title' => t('Variables'),
        '#description' => $description,
        // Variables can not be edited on configurations in code.
'#disabled' => $this->element
          ->hasStatus(ENTITY_IN_CODE),
      );
      $weight = 0;
      $provides = $this->element
        ->providesVariables();
      foreach ($this->element
        ->componentVariables() as $name => $var_info) {
        $form['settings']['vars']['items'][$name] = array(
          'weight' => array(
            '#default_value' => $weight++,
          ),
        ) + RulesPluginUI::getVariableForm($name, $var_info, isset($provides[$name]));
      }
      // Add one empty row in case user wants to add an additional variable.
      $form['settings']['vars']['items'][] = array(
        'weight' => array(
          '#default_value' => $weight++,
        ),
      ) + RulesPluginUI::getVariableForm();
      // Submit button will cause a form rebuild using the currently-entered
      // values. If a variable has been added, a new empty row will also appear.
      $form['settings']['vars']['more'] = array(
        '#type' => 'submit',
        '#value' => t('Add more'),
        '#ajax' => rules_ui_form_default_ajax('none'),
        '#limit_validation_errors' => array(
          array(
            'vars',
          ),
        ),
        '#submit' => array(
          'rules_form_submit_rebuild',
        ),
      );
      if (!empty($this->element->id)) {
        // Display a setting to manage access.
        $form['settings']['access'] = array(
          '#weight' => 50,
        );
        $plugin_type = $this->element instanceof RulesActionInterface ? t('action') : t('condition');
        $form['settings']['access']['access_exposed'] = array(
          '#type' => 'checkbox',
          '#title' => t('Configure access for using this component with a permission.'),
          '#default_value' => !empty($this->element->access_exposed),
          '#description' => t('By default, the @plugin-type for using this component may be only used by users that have access to configure the component. If checked, access is determined by a permission instead.', array(
            '@plugin-type' => $plugin_type,
          )),
        );
        $form['settings']['access']['permissions'] = array(
          '#type' => 'container',
          '#states' => array(
            'visible' => array(
              ':input[name="settings[access][access_exposed]"]' => array(
                'checked' => TRUE,
              ),
            ),
          ),
        );
        $form['settings']['access']['permissions']['matrix'] = $this->settingsFormPermissionMatrix();
      }
    }
    // @todo Attach field form thus description.
  }
  
  /**
   * Provides a matrix permission for the component based in the existing roles.
   *
   * @return array
   *   Form elements with the matrix of permissions for a component.
   */
  protected function settingsFormPermissionMatrix() {
    $form['#theme'] = 'user_admin_permissions';
    $status = array();
    $options = array();
    $role_names = user_roles();
    $role_permissions = user_role_permissions($role_names);
    $component_permission = rules_permissions_by_component(array(
      $this->element,
    ));
    $component_permission_name = key($component_permission);
    $form['permission'][$component_permission_name] = array(
      '#type' => 'item',
      '#markup' => $component_permission[$component_permission_name]['title'],
    );
    $options[$component_permission_name] = '';
    foreach ($role_names as $rid => $name) {
      if (isset($role_permissions[$rid][$component_permission_name])) {
        $status[$rid][] = $component_permission_name;
      }
    }
    // Build the checkboxes for each role.
    foreach ($role_names as $rid => $name) {
      $form['checkboxes'][$rid] = array(
        '#type' => 'checkboxes',
        '#options' => $options,
        '#default_value' => isset($status[$rid]) ? $status[$rid] : array(),
        '#attributes' => array(
          'class' => array(
            'rid-' . $rid,
          ),
        ),
      );
      $form['role_names'][$rid] = array(
        '#markup' => check_plain($name),
        '#tree' => TRUE,
      );
    }
    // Attach the default permissions page JavaScript.
    $form['#attached']['js'][] = drupal_get_path('module', 'user') . '/user.permissions.js';
    return $form;
  }
  
  /**
   * @param array $form
   *   The form array where to add the form.
   * @param array $form_state
   *   The current form state.
   */
  public function settingsFormExtractValues($form, &$form_state) {
    $form_values = RulesPluginUI::getFormStateValues($form['settings'], $form_state);
    $this->element->label = $form_values['label'];
    // If the name was changed we have to redirect to the URL that contains
    // the new name, instead of rebuilding on the old URL with the old name.
    if ($form['settings']['name']['#default_value'] != $form_values['name']) {
      $module = isset($this->element->module) ? $this->element->module : 'rules';
      $this->element->name = $module . '_' . $form_values['name'];
      $form_state['redirect'] = RulesPluginUI::path($this->element->name, 'edit', $this->element);
    }
    $this->element->tags = empty($form_values['tags']) ? array() : drupal_explode_tags($form_values['tags']);
    if (isset($form_values['vars']['items'])) {
      $vars =& $this->element
        ->componentVariables();
      $vars = array();
      if ($this->element instanceof RulesActionContainer) {
        $provides =& $this->element
          ->componentProvidesVariables();
        $provides = array();
      }
      usort($form_values['vars']['items'], 'rules_element_sort_helper');
      foreach ($form_values['vars']['items'] as $item) {
        if ($item['type'] && $item['name'] && $item['label']) {
          $vars[$item['name']] = array(
            'label' => $item['label'],
            'type' => $item['type'],
          );
          if (!$item['usage'][0]) {
            $vars[$item['name']]['parameter'] = FALSE;
          }
          if ($item['usage'][1] && isset($provides)) {
            $provides[] = $item['name'];
          }
        }
      }
      // Disable FAPI persistence for the variable form so renumbering works.
      $input =& $form_state['input'];
      foreach ($form['settings']['#parents'] as $parent) {
        $input =& $input[$parent];
      }
      unset($input['vars']);
    }
    $this->element->access_exposed = isset($form_values['access']['access_exposed']) ? $form_values['access']['access_exposed'] : FALSE;
  }
  
  /**
   * @param array $form
   *   The form array where to add the form.
   * @param array $form_state
   *   The current form state.
   */
  public function settingsFormValidate($form, &$form_state) {
    $form_values = RulesPluginUI::getFormStateValues($form['settings'], $form_state);
    if ($form['settings']['name']['#default_value'] != $form_values['name'] && rules_config_load($this->element->name)) {
      form_error($form['settings']['name'], t('The machine-readable name %name is already taken.', array(
        '%name' => $form_values['name'],
      )));
    }
  }
  
  /**
   * @param array $form
   *   The form array where to add the form.
   * @param array $form_state
   *   The current form state.
   */
  public function settingsFormSubmit($form, &$form_state) {
    if (isset($form_state['values']['settings']['access']) && !empty($this->element->access_exposed)) {
      // Save the permission matrix.
      foreach ($form_state['values']['settings']['access']['permissions']['matrix']['checkboxes'] as $rid => $value) {
        // Need to account for the case where the machine name has been changed,
        // because then the $value array variable will be keyed with the wrong
        // permission name. So here we recompute the permission name to use as
        // a key and extract the value from the $value array.
        $component_permission = rules_permissions_by_component(array(
          $this->element,
        ));
        $component_permission_name = key($component_permission);
        user_role_change_permissions($rid, array(
          $component_permission_name => current($value),
        ));
      }
    }
  }
  
  /**
   * Returns the form for configuring the info of a single variable.
   */
  public function getVariableForm($name = '', $info = array(), $provided = FALSE) {
    $form['type'] = array(
      '#type' => 'select',
      '#options' => array(
        0 => '--',
      ) + RulesPluginUI::getOptions('data'),
      '#default_value' => isset($info['type']) ? $info['type'] : 0,
    );
    $form['label'] = array(
      '#type' => 'textfield',
      '#size' => 40,
      '#default_value' => isset($info['label']) ? $info['label'] : '',
    );
    $form['name'] = array(
      '#type' => 'textfield',
      '#size' => 40,
      '#default_value' => $name,
      '#element_validate' => array(
        'rules_ui_element_machine_name_validate',
      ),
    );
    $usage[0] = !isset($info['parameter']) || $info['parameter'] ? 1 : 0;
    $usage[1] = $provided ? 1 : 0;
    $form['usage'] = array(
      '#type' => 'select',
      '#default_value' => implode('', $usage),
      '#options' => array(
        '10' => t('Parameter'),
        '11' => t('Parameter + Provided'),
        '01' => t('Provided'),
      ),
    );
    if ($this->element instanceof RulesConditionContainer) {
      $form['usage']['#disabled'] = TRUE;
    }
    // Just set the weight #default_value for the returned form.
    $form['weight'] = array(
      '#type' => 'weight',
    );
    return $form;
  }
  
  /**
   * Returns the name of class for the given data type.
   *
   * @param string $data_type
   *   The name of the data type
   * @param array $parameter_info
   *   (optional) An array of info about the to be configured parameter. If
   *   given, this array is complemented with data type defaults also.
   */
  public function getDataTypeClass($data_type, &$parameter_info = array()) {
    $cache = rules_get_cache();
    $data_info = $cache['data_info'];
    // Add in data-type defaults.
    if (empty($parameter_info['ui class'])) {
      $parameter_info['ui class'] = is_string($data_type) && isset($data_info[$data_type]['ui class']) ? $data_info[$data_type]['ui class'] : 'RulesDataUI';
    }
    if (is_subclass_of($parameter_info['ui class'], 'RulesDataInputOptionsListInterface')) {
      $parameter_info['options list'] = array(
        $parameter_info['ui class'],
        'optionsList',
      );
    }
    return $parameter_info['ui class'];
  }
  
  /**
   * Implements RulesPluginUIInterface.
   *
   * Shows a preview of the configuration settings.
   */
  public function buildContent() {
    $config_name = $this->element
      ->root()->name;
    $content['label'] = array(
      '#type' => 'link',
      '#title' => $this->element
        ->label(),
      '#href' => $this->element
        ->isRoot() ? RulesPluginUI::path($config_name) : RulesPluginUI::path($config_name, 'edit', $this->element),
      '#prefix' => '<div class="rules-element-label">',
      '#suffix' => '</div>',
    );
    // Put the elements below in a "description" div.
    $content['description'] = array(
      '#prefix' => '<div class="description">',
    );
    $content['description']['parameter'] = array(
      '#caption' => t('Parameter'),
      '#theme' => 'rules_content_group',
    );
    foreach ($this->element
      ->pluginParameterInfo() as $name => $parameter) {
      $element = array();
      if (!empty($this->element->settings[$name . ':select'])) {
        $element['content'] = array(
          '#markup' => '[' . $this->element->settings[$name . ':select'] . ']',
        );
      }
      elseif (isset($this->element->settings[$name])) {
        $class = $this->getDataTypeClass($parameter['type'], $parameter);
        $method = empty($parameter['options list']) ? 'render' : 'renderOptionsLabel';
        // We cannot use method_exists() here as it would trigger a PHP bug.
        // @see https://www.drupal.org/node/1258284
        $element = call_user_func(array(
          $class,
          $method,
        ), $this->element->settings[$name], $name, $parameter, $this->element);
      }
      // Only add parameters that are really configured / not default.
      if ($element) {
        $content['description']['parameter'][$name] = array(
          '#theme' => 'rules_parameter_configuration',
          '#info' => $parameter,
        ) + $element;
      }
    }
    foreach ($this->element
      ->providesVariables() as $name => $var_info) {
      $content['description']['provides'][$name] = array(
        '#theme' => 'rules_variable_view',
        '#info' => $var_info,
        '#name' => $name,
      );
    }
    if (!empty($content['description']['provides'])) {
      $content['description']['provides'] += array(
        '#caption' => t('Provides variables'),
        '#theme' => 'rules_content_group',
      );
    }
    // Add integrity exception messages if there are any for this element.
    try {
      $this->element
        ->integrityCheck();
      // A configuration is still marked as dirty, but already works again.
      if (!empty($this->element->dirty)) {
        rules_config_update_dirty_flag($this->element);
        $variables = array(
          '%label' => $this->element
            ->label(),
          '%name' => $this->element->name,
          '@plugin' => $this->element
            ->plugin(),
        );
        drupal_set_message(t('The @plugin %label (%name) was marked dirty, but passes the integrity check now and is active again.', $variables));
        rules_clear_cache();
      }
    } catch (RulesIntegrityException $e) {
      $content['description']['integrity'] = array(
        '#theme' => 'rules_content_group',
        '#caption' => t('Error'),
        '#attributes' => array(
          'class' => array(
            'rules-content-group-integrity-error',
          ),
        ),
        'error' => array(
          '#markup' => filter_xss($e->getMessage()),
        ),
      );
      // Also make sure the rule is marked as dirty.
      if (empty($this->element->dirty)) {
        rules_config_update_dirty_flag($this->element);
        rules_clear_cache();
      }
    }
    $content['#suffix'] = '</div>';
    $content['#type'] = 'container';
    $content['#attributes']['class'][] = 'rules-element-content';
    return $content;
  }
  
  /**
   * Implements RulesPluginUIInterface.
   */
  public function operations() {
    $name = $this->element
      ->root()->name;
    $render = array(
      '#theme' => 'links__rules',
    );
    $render['#attributes']['class'][] = 'rules-operations';
    $render['#attributes']['class'][] = 'action-links';
    $render['#links']['edit'] = array(
      'title' => t('edit'),
      'href' => RulesPluginUI::path($name, 'edit', $this->element),
    );
    $render['#links']['delete'] = array(
      'title' => t('delete'),
      'href' => RulesPluginUI::path($name, 'delete', $this->element),
    );
    return $render;
  }
  
  /**
   * Implements RulesPluginUIInterface.
   */
  public function help() {
  }
  
  /**
   * Deprecated by the controllers overviewTable() method.
   */
  public static function overviewTable($conditions = array(), $options = array()) {
    return rules_ui()->overviewTable($conditions, $options);
  }
  
  /**
   * Generates an operation path.
   *
   * Generates a path using the given operation for the element with the given
   * id of the configuration with the given name.
   */
  public static function path($name, $op = NULL, RulesPlugin $element = NULL, $parameter = FALSE) {
    $element_id = isset($element) ? $element->elementId() : FALSE;
    if (isset(self::$basePath)) {
      $base_path = self::$basePath;
    }
    else {
      $base_path = isset($element) && $element instanceof RulesTriggerableInterface ? 'admin/config/workflow/rules/reaction' : 'admin/config/workflow/rules/components';
    }
    // Only append the '/manage' path if it is not already present.
    if (substr($base_path, -strlen('/manage')) != '/manage') {
      $base_path .= '/manage';
    }
    return implode('/', array_filter(array(
      $base_path,
      $name,
      $op,
      $element_id,
      $parameter,
    )));
  }
  
  /**
   * Determines the default redirect target for an edited/deleted element.
   *
   * This is a parent element which is either a rule or the configuration root.
   */
  public static function defaultRedirect(RulesPlugin $element) {
    while (!$element->isRoot()) {
      if ($element instanceof Rule) {
        return self::path($element->root()->name, 'edit', $element);
      }
      $element = $element->parentElement();
    }
    return self::path($element->name);
  }
  
  /**
   * @see RulesUICategory::getOptions()
   */
  public static function getOptions($item_type, $items = NULL) {
    return RulesUICategory::getOptions($item_type, $items = NULL);
  }
  
  /**
   * @param array $form
   *   The form array where to add the form.
   * @param array $form_state
   *   The current form state.
   */
  public static function formDefaults(&$form, &$form_state) {
    form_load_include($form_state, 'inc', 'rules', 'ui/ui.forms');
    // Add our own css.
    $form['#attached']['css'][] = drupal_get_path('module', 'rules') . '/ui/rules.ui.css';
    // Workaround for problems with jquery css in seven theme and the core
    // autocomplete.
    if ($GLOBALS['theme'] == 'seven') {
      $form['#attached']['css'][] = drupal_get_path('module', 'rules') . '/ui/rules.ui.seven.css';
    }
    // Specify the wrapper div used by #ajax.
    $form['#prefix'] = '<div id="rules-form-wrapper">';
    $form['#suffix'] = '</div>';
    // Preserve the base path in the form state. The after build handler will
    // set self::$basePath again for cached forms.
    if (isset(self::$basePath)) {
      $form_state['_rules_base_path'] = RulesPluginUI::$basePath;
      $form['#after_build'][] = 'rules_form_after_build_restore_base_path';
    }
  }
  public static function getTags() {
    $result = db_select('rules_tags')->distinct()
      ->fields('rules_tags', array(
      'tag',
    ))
      ->groupBy('tag')
      ->execute()
      ->fetchCol();
    return drupal_map_assoc($result);
  }

}