<?php

namespace WapplerSystems\ABTest2;

/**
 * This file is part of the "abtest2" Extension for TYPO3 CMS.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 */

use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
use TYPO3\CMS\Frontend\Page\PageRepository;

/**
 * This class detects which page version (either by cookie or by random) and sets the page content ID accordingly.
 *
 * @package WapplerSystems\ABTest2
 * @author Sven Wapler <typo3YYYYY@wappler.systems>
 */
class Helper
{

    /** @var int|null */
    protected $currentPageId = null;

    /** @var int|null */
    protected $rootpage_id = null;

    /** @var int|null */
    protected $realurlConfig = null;

    /** @var int|null */
    protected $selectBSite = null;

    /** @var int|null */
    protected $cookieLifeTime = null;

    /** @var int|null */
    protected $randomAbPageId = null;

    /** @var string */
    protected $additionalHeaderData;

    /**
     *
     * @param array $params
     * @param $pObj TypoScriptFrontendController
     * @return void
     * @throws \InvalidArgumentException
     */
    public function determineContentId(array $params, &$pObj)
    {

        // only try to change the page if it's not the googlebot.
        if (false === stripos($_SERVER['HTTP_USER_AGENT'], 'googlebot')) {

            $this->currentPageId = $pObj->id;

            // Get the rootpage_id from realurl config.
            $this->realurlConfig = $pObj->TYPO3_CONF_VARS['EXTCONF']['realurl'];
            if (array_key_exists($_SERVER['SERVER_NAME'], $this->realurlConfig)) {
                $this->rootpage_id = $this->realurlConfig[$_SERVER['SERVER_NAME']]['pagePath']['rootpage_id'];
            } else {
                $this->rootpage_id = $this->realurlConfig['_DEFAULT']['pagePath']['rootpage_id'];
            }

            // If the ID is NULL, then we set this value to the rootpage_id. NULL is the "Home"page, ID is a specific sub-page, e.g. www.domain.de (NULL) - www.domain.de/page.html (ID)
            if (!$this->currentPageId) {
                if ($this->rootpage_id) {
                    $this->currentPageId = $this->rootpage_id;
                } else {
                    // Leave the function because we can not determine the ID.
                    return;
                }
            }

            $pageRepository = GeneralUtility::makeInstance(PageRepository::class);
            $currentPagePropertiesArray = $pageRepository->getPage($this->currentPageId);

            $this->selectBSite = $currentPagePropertiesArray['tx_abtest2_b_id'];
            $this->cookieLifeTime = $currentPagePropertiesArray['tx_abtest2_cookie_time'];

            if ($this->selectBSite) {
                if ((int)$_COOKIE['abtest2-' . $this->currentPageId] > 0) {
                    $this->randomAbPageId = (int)$_COOKIE['abtest2-' . $this->currentPageId];
                } else {
                    $randomPage = rand(0, 1); // 0 = original ID; 1 = "B" site.
                    if ($randomPage) {
                        $this->randomAbPageId = $this->selectBSite;
                    } else {
                        $this->randomAbPageId = $this->currentPageId;
                    }
                    setcookie('abtest2-' . $this->currentPageId, $this->randomAbPageId, time() + $this->cookieLifeTime);
                }

                // If current page ID is different from the random page ID we set the correct page ID.
                if ($this->currentPageId !== $this->randomAbPageId) {
                    $pObj->contentPid = $this->randomAbPageId;
                    $GLOBALS['TSFE']->page['content_from_pid'] = $this->randomAbPageId;
                    $GLOBALS['TSFE']->page['no_cache'] = true;
                }
            }

            // If additional headerdata is present then we specify additionalHeaderData.
            $randomPagePropertiesArray = $pageRepository->getPage($this->randomAbPageId);
            $this->additionalHeaderData = $randomPagePropertiesArray['tx_abtest2_header'];
            if ($this->additionalHeaderData) {
                $GLOBALS['TSFE']->additionalHeaderData['abtest2'] = $this->additionalHeaderData;
            }

        }

    }
}