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<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2020 Open Source Matters, Inc.
<https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see
LICENSE.txt
 */

namespace Joomla\CMS\Form\Rule;

use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormRule;
use Joomla\Database\DatabaseAwareInterface;
use Joomla\Database\DatabaseAwareTrait;
use Joomla\Database\ParameterType;
use Joomla\Registry\Registry;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Form Rule class for the Joomla Platform.
 *
 * @since  4.0.0
 */
class UserIdRule extends FormRule implements DatabaseAwareInterface
{
    use DatabaseAwareTrait;

    /**
     * Method to test the validity of a Joomla User.
     *
     * @param   \SimpleXMLElement  $element  The SimpleXMLElement object
representing the `<field>` tag for the form field object.
     * @param   mixed              $value    The form field value to
validate.
     * @param   ?string            $group    The field name group control
value. This acts as an array container for the field.
     *                                       For example if the field has
name="foo" and the group value is set to "bar" then the
     *                                       full field name would end up
being "bar[foo]".
     * @param   ?Registry          $input    An optional Registry object
with the entire data set to validate against the entire form.
     * @param   ?Form              $form     The form object for which the
field is being tested.
     *
     * @return  boolean  True if the value is valid, false otherwise.
     *
     * @since   4.0.0
     */
    public function test(\SimpleXMLElement $element, $value, $group = null,
Registry $input = null, Form $form = null)
    {
        // Check if the field is required.
        $required = ((string) $element['required'] ===
'true' || (string) $element['required'] ===
'required');

        // If the value is empty, null or has the value 0 and the field is
not required return true else return false
        if (($value === '' || $value === null || (string) $value
=== '0')) {
            return !$required;
        }

        // Get the database object and a new query object.
        $db    = $this->getDatabase();
        $query = $db->getQuery(true);

        // Build the query.
        $query->select('COUNT(*)')
            ->from($db->quoteName('#__users'))
            ->where($db->quoteName('id') . ' =
:userId')
            ->bind(':userId', $value, ParameterType::INTEGER);

        // Set and query the database.
        return (bool) $db->setQuery($query)->loadResult();
    }
}