ot_typo3/ot_templating/Classes/ViewHelpers/EventsPage/GetIdViewHelper.php

<?php

namespace Opentalent\OtTemplating\ViewHelpers\EventsPage;

use Closure;
use Opentalent\OtTemplating\Page\OtPageRepository;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;

/**
 * Retrieves and returns the uid of the events' page of the current site
 * The events page is the first page found with the template 'OpenTalent.OtTemplating->events'
 * Returns null if no such page is found
 *
 * Call it in fluid templates with:
 *
 *     {namespace ot=Opentalent\OtTemplating\ViewHelpers}
 *
 *     {ot:eventsPage.getId()}
 *
 * @package Opentalent\OtTemplating\ViewHelpers
 */
class GetIdViewHelper extends AbstractViewHelper
{

    /**
     *  -- This method is expected by Fluid --
     * Renders the content as html
     *
     * @param array $arguments
     * @param Closure $renderChildrenClosure
     * @param RenderingContextInterface $renderingContext
     * @return int|null
     */
    public static function renderStatic(
        array $arguments,
        Closure $renderChildrenClosure,
        RenderingContextInterface $renderingContext
    ) {
        $rootId = \Opentalent\OtTemplating\ViewHelpers\RootPage\GetIdViewHelper::renderStatic(
            $arguments,
            $renderChildrenClosure,
            $renderingContext
        );
        $pageRepository = GeneralUtility::makeInstance(OtPageRepository::class);

        $subpages = $pageRepository->getAllSubpagesForPage($rootId);

        foreach ($subpages as $page) {
            if ($page['tx_fed_page_controller_action'] === 'OpenTalent.OtTemplating->events') {
                return $page['uid'];
            }
        }
        return null;
    }
}