<?php

/**
 * @package     Joomla.Administrator
 * @subpackage  com_scheduler
 *
 * @copyright   (C) 2021 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Component\Scheduler\Administrator\Rule;

use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormRule;
use Joomla\CMS\Form\Rule\OptionsRule;
use Joomla\Registry\Registry;

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

/**
 * The ExecutionRulesRule Class.
 * Validates execution rules, with input for other fields as context.
 *
 * @since  4.1.0
 */
class ExecutionRulesRule extends FormRule
{
    /**
     * @var string  RULE_TYPE_FIELD   The field containing the rule type to test against
     * @since  4.1.0
     */
    private const RULE_TYPE_FIELD = "execution_rules.rule-type";

    /**
     * @var string CUSTOM_RULE_GROUP  The field group containing custom execution rules
     * @since  4.1.0
     */
    private const CUSTOM_RULE_GROUP = "execution_rules.cron-expression";

    /**
     * @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
     *
     * @since  4.1.0
     */
    public function test(\SimpleXMLElement $element, $value, $group = null, ?Registry $input = null, ?Form $form = null): bool
    {
        $fieldName = (string) $element['name'];
        $ruleType  = $input->get(self::RULE_TYPE_FIELD);

        if ($ruleType === $fieldName || ($ruleType === 'cron-expression' && $group === self::CUSTOM_RULE_GROUP)) {
            return $this->validateField($element, $value, $group, $form);
        }

        return true;
    }

    /**
     * @param   \SimpleXMLElement  $element  The SimpleXMLElement for the field.
     * @param   mixed              $value    The field value.
     * @param   ?string            $group    The form field group the element belongs to.
     * @param   Form|null          $form     The Form object against which the field is tested/
     *
     * @return boolean  True if field is valid
     *
     * @since  4.1.0
     */
    private function validateField(\SimpleXMLElement $element, $value, ?string $group = null, ?Form $form = null): bool
    {
        $elementType = (string) $element['type'];

        // If element is of cron type, we test against options and return
        if ($elementType === 'cron') {
            $clonedElement = clone $element;
            $clonedElement->addAttribute('required', 'true');
            return (new OptionsRule())->test($clonedElement, $value, $group, null, $form);
        }

        // Test for a positive integer value and return
        return filter_var($value, FILTER_VALIDATE_INT, ['options' => ['min_range' => 1]]);
    }
}