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

/*
 * 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;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;

/**
 * Base class: Extension ViewHelpers
 *
 * @author Claus Due <claus@namelesscoder.net>
 * @package Vhs
 * @subpackage ViewHelpers\Extension
 */
abstract class AbstractExtensionViewHelper extends AbstractViewHelper {

	/**
	 * @return void
	 */
	public function initializeArguments() {
		$this->registerArgument('extensionName', 'string', 'Name, in UpperCamelCase, of the extension to be checked', FALSE, NULL, TRUE);
	}

	/**
	 * @return string
	 */
	protected function getExtensionKey() {
		$extensionName = $this->getExtensionName();
		return GeneralUtility::camelCaseToLowerCaseUnderscored($extensionName);
	}

	/**
	 * @throws \RuntimeException
	 * @return mixed
	 */
	protected function getExtensionName() {
		if (TRUE === isset($this->arguments['extensionName']) && FALSE === empty($this->arguments['extensionName'])) {
			return $this->arguments['extensionName'];
		}
		$request = $this->controllerContext->getRequest();
		$extensionName = $request->getControllerExtensionName();
		if (TRUE === empty($extensionName)) {
			throw new \RuntimeException('Unable to read extension name from ControllerContext and value not manually specified', 1364167519);
		}
		return $extensionName;
	}

}