<?php
namespace FluidTYPO3\Vhs\ViewHelpers\Page;

/*
 * 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 FluidTYPO3\Vhs\Service\PageSelectService;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;

/**
 * Returns the current language from languages depending on l18n settings.
 *
 * @author Danilo Bürger <danilo.buerger@hmspl.de>, Heimspiel GmbH
 * @package Vhs
 * @subpackage ViewHelpers\Page
 */
class LanguageViewHelper extends AbstractViewHelper {

	/**
	 * @var PageSelectService
	 */
	protected $pageSelect;

	/**
	 * @param PageSelectService $pageSelectService
	 * @return void
	 */
	public function injectPageSelectService(PageSelectService $pageSelectService) {
		$this->pageSelect = $pageSelectService;
	}

	/**
	 * Initialize
	 *
	 * @return void
	 */
	public function initializeArguments() {
		$this->registerArgument('languages', 'mixed', 'The languages (either CSV, array or implementing Traversable)', FALSE);
		$this->registerArgument('pageUid', 'integer', 'The page uid to check', FALSE, 0);
		$this->registerArgument('normalWhenNoLanguage', 'boolean', 'If TRUE, a missing page overlay should be ignored', FALSE, FALSE);
	}

	/**
	 * @return string
	 */
	public function render() {
		if ('BE' === TYPO3_MODE) {
			return '';
		}

		$languages = $this->arguments['languages'];
		if (TRUE === $languages instanceof \Traversable) {
			$languages = iterator_to_array($languages);
		} elseif (TRUE === is_string($languages)) {
			$languages = GeneralUtility::trimExplode(',', $languages, TRUE);
		} else {
			$languages = (array) $languages;
		}

		$pageUid = intval($this->arguments['pageUid']);
		$normalWhenNoLanguage = $this->arguments['normalWhenNoLanguage'];

		if (0 === $pageUid) {
			$pageUid = $GLOBALS['TSFE']->id;
		}

		$currentLanguageUid = $GLOBALS['TSFE']->sys_language_uid;
		$languageUid = 0;
		if (FALSE === $this->pageSelect->hidePageForLanguageUid($pageUid, $currentLanguageUid, $normalWhenNoLanguage)) {
			$languageUid = $currentLanguageUid;
		} elseif (0 !== $currentLanguageUid) {
			if (TRUE === $this->pageSelect->hidePageForLanguageUid($pageUid, 0, $normalWhenNoLanguage)) {
				return '';
			}
		}

		if (FALSE === empty($languages[$languageUid])) {
			return $languages[$languageUid];
		}

		return $languageUid;
	}

}