public static function filterRoles(PersonInterface $person, FormInterface $form, array $roles, SecurityHelper $securityHelper)
 {
     $loggedUserLevel = $securityHelper->getLoggedInUserLevel();
     $targetPersonLevel = $securityHelper->getTargetPersonLevel($person);
     $isLoggedUserSuperAdmin = $securityHelper->isGranted('ROLE_SUPER_ADMIN');
     $filteredRoles = array();
     foreach ($roles as $role => $name) {
         $isFeature = preg_match('/^FEATURE_/', $role) === 1;
         if (!$isLoggedUserSuperAdmin && $isFeature) {
             continue;
         }
         if ($loggedUserLevel < $securityHelper->getRoleLevel($role)) {
             continue;
         }
         $filteredRoles[$role] = $name;
     }
     asort($filteredRoles);
     $form->add('roles', 'choice', array('choices' => $filteredRoles, 'multiple' => true, 'read_only' => $targetPersonLevel > $loggedUserLevel, 'disabled' => $targetPersonLevel > $loggedUserLevel));
     return $filteredRoles;
 }