Method getGroups

/**
 * Method to get a value from option
 *
 * @param   object  $user  user object
 *
 * @return  array
 *
 * @since   4.0.0
 */
protected function getGroups($user) : array
{
    $option = $this->getApplication()->getConsoleInput()->getOption('group');
    $db = Factory::getDbo();
    $userGroups = Access::getGroupsByUser($user->id, false);
    if (!$option) {
        $query = $db->getQuery(true)->select($db->quoteName('title'))->from($db->quoteName('#__usergroups'))->whereIn($db->quoteName('id'), $userGroups);
        $db->setQuery($query);
        $result = $db->loadColumn();
        $choice = new ChoiceQuestion('Please select a usergroup (separate multiple groups with a comma)', $result);
        $choice->setMultiselect(true);
        $answer = (array) $this->ioStyle->askQuestion($choice);
        $groupList = [];
        foreach ($answer as $group) {
            $groupList[] = $this->getGroupId($group);
        }
        return $groupList;
    }
    $groupList = [];
    $option = explode(',', $option);
    foreach ($option as $group) {
        $groupId = $this->getGroupId($group);
        if (empty($groupId)) {
            $this->ioStyle->error("Invalid group name '" . $group . "'");
            throw new InvalidOptionException("Invalid group name " . $group);
        }
        $groupList[] = $this->getGroupId($group);
    }
    return $groupList;
}