$GLOBALS['TYPO3_CONF_VARS']['FE']['eID_include']['product'] = Xp\Product\Utility\Ajax::class . '::testAction';

<?php

namespace Xp\Product\Utility;

use DateTime;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Http\Response;
use TYPO3\CMS\Core\Http\Stream;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Configuration\ConfigurationManager;
use TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface;

class Ajax
{

  public function testAction(ServerRequestInterface $request): ResponseInterface
  {
        $configurationManager = GeneralUtility::makeInstance(ConfigurationManager::class);
        $typoScript = $configurationManager->getConfiguration(
            ConfigurationManagerInterface::CONFIGURATION_TYPE_FULL_TYPOSCRIPT,
            'intranet_template'
        );

        $settingsText = $typoScript['page.']['10.']['variables.']['maintenanceWindow.']['value'] ?? '';
        $maintenanceWindowContentUid = (int)$typoScript['page.']['10.']['variables.']['maintenanceWindowContentUid.']['value'] ?? 30133;

        $response = new Response();
        $body = $response->getBody();
        $body->rewind();
        $content = $body->getContents();

        $response = $response->withHeader('Content-Type', 'application/json');
        $arguments = $request->getParsedBody();
        $date = new DateTime();

        $dayOfMonth = $date->format('j');
        $numberOfWeek = $date->format('N');
        $show = false;
        $firstWednesday = strtotime('first Wednesday of this month 1:00 PM');
        $currentTime = time();
        if ($dayOfMonth <= 7 && $numberOfWeek <= 3 && $currentTime <= $firstWednesday) {
            $show = true;
        }

        $dateOfFirstWednesday = date('d.m.Y', strtotime('first Wednesday of this month'));

        $bodyText = $this->getContentByUid($maintenanceWindowContentUid);
        $text = $settingsText ? sprintf($settingsText, $dateOfFirstWednesday) : sprintf($bodyText, $dateOfFirstWednesday);

        $data = [
            'text' => $text,
            'show' => $show,
            'day' => $date->format('d'),
            'month' => $date->format('m'),
            'year' => $date->format('Y'),
            'dateOfFirstWednesday' => $dateOfFirstWednesday,
            'j' => $dayOfMonth,
            'n' => $numberOfWeek,
            'h' => $date->format('H'),
            'i' => $date->format('i'),
            's' => $date->format('s'),
            'currentTime' => $currentTime,
            'firstWednesday' => $firstWednesday,
        ];
        $body = new Stream('php://temp', 'rw');
        $content = json_encode($data);
        $body->write($content);

        if ($arguments['eID'] === 'banner') {
            $response->withStatus(200);
        }

        return $response->withBody($body);
  }

  private function getContentByUid(int $uid)
    {
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('tt_content');

        $row = $queryBuilder->select('bodytext')
            ->from('tt_content')
            ->where(
                $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($uid, \PDO::PARAM_INT))
            )
            ->executeQuery()
            ->fetchAssociative();
        return $row['bodytext'] ?? '';
    }
}