<?php
namespace TYPO3\CMS\Belog\ViewHelpers\Form;

/**
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

/**
 * Extends the usual select view helper, but additionally translates
 * the select option labels
 *
 * Example:
 * <belog:form.translateLabelSelect property="number" options="{settings.selectableNumberOfLogEntries}" optionLabelPrefix="numbers"
 *
 * Will lookup number.200 (or whatever optionValue is given) in locallang database
 *
 * @author Christian Kuhn <lolli@schwarzbu.ch>
 */
class TranslateLabelSelectViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Form\SelectViewHelper {

	/**
	 * Initialize arguments.
	 *
	 * @return void
	 * @api
	 */
	public function initializeArguments() {
		parent::initializeArguments();
		$this->registerArgument('optionLabelPrefix', 'string', 'Prefix for locallang lookup');
	}

	/**
	 * Render the option tags.
	 *
	 * Extend the default handling by iterating over calculated options array and
	 * try to translate the value
	 *
	 * @return array An associative array of options, key will be the value of the option tag
	 */
	protected function getOptions() {
		$options = parent::getOptions();
		foreach ($options as $value => $label) {
			$options[$value] = $this->translateLabel($label);
		}
		return $options;
	}

	/**
	 * Fetches the translation for a given label. If no translation is found, the label is returned unchanged.
	 *
	 * @param string $label The label to translate
	 * @return string
	 */
	protected function translateLabel($label) {
		if ($label === '') {
			return '';
		}
		$labelKey = $this->hasArgument('optionLabelPrefix') ? $this->arguments['optionLabelPrefix'] . $label : $label;
		$translatedLabel = \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate($labelKey, $this->controllerContext->getRequest()->getControllerExtensionName());
		return $translatedLabel ?: $label;
	}

}
