<?php
namespace FluidTYPO3\Vhs\Utility;

/*
 * This file is part of the FluidTYPO3/Vhs project under GPLv2 or later.
 *
 * For the full copyright and license information, please read the
 * LICENSE.md file that was distributed with this source code.
 */

use TYPO3\CMS\Core\Utility\GeneralUtility;

/**
 * Frontend Simulation Utility
 *
 * Utility to simulate frontend enviroment in backend enviroment.
 *
 * @author Xaver Maierhofer <xaver.maierhofer@xwissen.info>
 * @package Vhs
 * @subpackage Utility
 */
class FrontendSimulationUtility {

	/**
	 * Sets the global variables $GLOBALS['TSFE']->csConvObj and $GLOBALS['TSFE']->renderCharset in Backend mode
	 * This somewhat hacky work around is currently needed because the conv_case() and convCaseFirst() functions of tslib_cObj rely on those variables to be set
	 *
	 * @return mixed
	 */
	public static function simulateFrontendEnvironment() {
		if ('BE' !== TYPO3_MODE) {
			return;
		}
		$tsfeBackup = isset($GLOBALS['TSFE']) ? $GLOBALS['TSFE'] : NULL;
		$GLOBALS['TSFE'] = new \stdClass();
		// preparing csConvObj
		if (FALSE === is_object($GLOBALS['TSFE']->csConvObj)) {
			if (TRUE === is_object($GLOBALS['LANG'])) {
				$GLOBALS['TSFE']->csConvObj = $GLOBALS['LANG']->csConvObj;
			} else {
				$GLOBALS['TSFE']->csConvObj = GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Charset\\CharsetConverter');
			}
		}
		// preparing renderCharset
		if (FALSE === is_object($GLOBALS['TSFE']->renderCharset)) {
			if (TRUE === is_object($GLOBALS['LANG'])) {
				$GLOBALS['TSFE']->renderCharset = $GLOBALS['LANG']->charSet;
			} else {
				$GLOBALS['TSFE']->renderCharset = 'utf-8';
			}
		}
		return $tsfeBackup;
	}

	/**
	 * Resets $GLOBALS['TSFE'] if it was previously changed by simulateFrontendEnvironment()
	 *
	 * @param mixed $tsfeBackup
	 * @return void
	 * @see simulateFrontendEnvironment()
	 */
	public static function resetFrontendEnvironment($tsfeBackup) {
		if ('BE' !== TYPO3_MODE) {
			return;
		}
		$GLOBALS['TSFE'] = $tsfeBackup;
	}

}