<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2009 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\Access\Access;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormRule;
use Joomla\Registry\Registry;

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

/**
 * Form Rule class for the Joomla Platform.
 *
 * @since  1.7.0
 */
class RulesRule extends FormRule
{
    /**
     * Method to test the value.
     *
     * @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   1.7.0
     */
    public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null)
    {
        // Get the possible field actions and the ones posted to validate them.
        $fieldActions = self::getFieldActions($element);
        $valueActions = self::getValueActions($value);

        // Make sure that all posted actions are in the list of possible actions for the field.
        foreach ($valueActions as $action) {
            if (!\in_array($action, $fieldActions)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Method to get the list of permission action names from the form field value.
     *
     * @param   mixed  $value  The form field value to validate.
     *
     * @return  array  A list of permission action names from the form field value.
     *
     * @since   1.7.0
     */
    protected function getValueActions($value)
    {
        $actions = array();

        // Iterate over the asset actions and add to the actions.
        foreach ((array) $value as $name => $rules) {
            $actions[] = $name;
        }

        return $actions;
    }

    /**
     * Method to get the list of possible permission action names for the form field.
     *
     * @param   \SimpleXMLElement  $element  The \SimpleXMLElement object representing the `<field>` tag for the form field object.
     *
     * @return  array  A list of permission action names from the form field element definition.
     *
     * @since   1.7.0
     */
    protected function getFieldActions(\SimpleXMLElement $element)
    {
        $actions = array();

        // Initialise some field attributes.
        $section = $element['section'] ? (string) $element['section'] : '';
        $component = $element['component'] ? (string) $element['component'] : '';

        // Get the asset actions for the element.
        $elActions = Access::getActionsFromFile(
            JPATH_ADMINISTRATOR . '/components/' . $component . '/access.xml',
            "/access/section[@name='" . $section . "']/"
        );

        if ($elActions) {
            // Iterate over the asset actions and add to the actions.
            foreach ($elActions as $item) {
                $actions[] = $item->name;
            }
        }

        // Iterate over the children and add to the actions.
        foreach ($element->children() as $el) {
            if ($el->getName() === 'action') {
                $actions[] = (string) $el['name'];
            }
        }

        return $actions;
    }
}