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<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  System.Highlight
 *
 * @copyright   (C) 2011 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Factory;
use Joomla\CMS\Filter\InputFilter;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\Component\Finder\Administrator\Indexer\Result;

/**
 * System plugin to highlight terms.
 *
 * @since  2.5
 */
class PlgSystemHighlight extends CMSPlugin
{
	/**
	 * Application object.
	 *
	 * @var    \Joomla\CMS\Application\CMSApplication
	 * @since  3.7.0
	 */
	protected $app;

/**
	 * Method to catch the onAfterDispatch event.
	 *
	 * This is where we setup the click-through content highlighting for.
	 * The highlighting is done with JavaScript so we just
	 * need to check a few parameters and the JHtml behavior will do the rest.
	 *
	 * @return  void
	 *
	 * @since   2.5
	 */
	public function onAfterDispatch()
	{
		// Check that we are in the site application.
		if ($this->app->isClient('administrator'))
		{
			return;
		}

// Set the variables.
		$input     = $this->app->input;
		$extension = $input->get('option', '', 'cmd');

// Check if the highlighter is enabled.
		if (!ComponentHelper::getParams($extension)->get('highlight_terms', 1))
		{
			return;
		}

// Check if the highlighter should be activated in this environment.
		if ($input->get('tmpl', '', 'cmd') === 'component' || $this->app->getDocument()->getType() !== 'html')
		{
			return;
		}

// Get the terms to highlight from the request.
		$terms = $input->request->get('highlight', null, 'base64');
		$terms = $terms ? json_decode(base64_decode($terms)) : null;

// Check the terms.
		if (empty($terms))
		{
			return;
		}

// Clean the terms array.
		$filter     = InputFilter::getInstance();

$cleanTerms = array();

foreach ($terms as $term)
		{
			$cleanTerms[] = htmlspecialchars($filter->clean($term, 'string'));
		}

// Activate the highlighter.
		if (!empty($cleanTerms))
		{
			$doc = Factory::getDocument();

$doc->getWebAssetManager()->useScript('highlight');
			$doc->addScriptOptions(
				'highlight',
				[[
					'class'      => 'js-highlight',
					'highLight'  => $cleanTerms,
				]]
			);
		}

// Adjust the component buffer.
		/** @var \Joomla\CMS\Document\HtmlDocument $doc */
		$doc = $this->app->getDocument();
		$buf = $doc->getBuffer('component');
		$buf = '<div class="js-highlight">' . $buf . '</div>';
		$doc->setBuffer($buf, 'component');
	}

/**
	 * Method to catch the onFinderResult event.
	 *
	 * @param   Result  $item   The search result
	 * @param   array   $query  The search query of this result
	 *
	 * @return  void
	 *
	 * @since   4.0.0
	 */
	public function onFinderResult($item, $query)
	{
		static $params;

if (is_null($params))
		{
			$params = ComponentHelper::getParams('com_finder');
		}

// Get the route with highlighting information.
		if (!empty($query->highlight)
			&& empty($item->mime)
			&& $params->get('highlight_terms', 1))
		{
			$item->route .= '&highlight=' . base64_encode(json_encode($query->highlight));
		}
	}
}