<?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\Utility\ContextUtility;
use FluidTYPO3\Vhs\ViewHelpers\Asset\AbstractAssetViewHelper;

/**
 * ViewHelper used to place header blocks in document header
 */
class HeaderViewHelper extends AbstractAssetViewHelper
{
    /**
     * Render method
     *
     * @return void
     */
    public function render()
    {
        if (ContextUtility::isBackend()) {
            return;
        }
        $content = $this->getContent();
        $name = $this->getName();
        $overwrite = $this->getOverwrite();
        if (isset($GLOBALS['TSFE']->additionalHeaderData[$name]) && !$overwrite) {
            return;
        }
        $GLOBALS['TSFE']->additionalHeaderData[$name] = $content;
    }
}