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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2006 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Document;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Factory as CmsFactory;
use Joomla\CMS\Layout\LayoutHelper;

/**
 * ErrorDocument class, provides an easy interface to parse and display an HTML based error page
 *
 * @since  1.7.0
 */
class ErrorDocument extends HtmlDocument
{
	/**
	 * Flag if debug mode has been enabled
	 *
	 * @var    boolean
	 * @since  1.7.0
	 */
	public $debug = false;

	/**
	 * Error Object
	 *
	 * @var    \Throwable
	 * @since  1.7.0
	 */
	public $error;

	/**
	 * Error Object
	 *
	 * @var    \Throwable
	 * @since  1.7.0
	 */
	protected $_error;

	/**
	 * Class constructor
	 *
	 * @param   array  $options  Associative array of attributes
	 *
	 * @since   1.7.0
	 */
	public function __construct($options = array())
	{
		parent::__construct($options);

		// Set document type
		$this->_type = 'error';
	}

	/**
	 * Set error object
	 *
	 * @param   \Throwable  $error  Error object to set
	 *
	 * @return  boolean  True on success
	 *
	 * @since   1.7.0
	 */
	public function setError($error)
	{
		if ($error instanceof \Throwable)
		{
			$this->_error = & $error;

			return true;
		}

		return false;
	}

	/**
	 * Load a renderer
	 *
	 * @param   string  $type  The renderer type
	 *
	 * @return  RendererInterface
	 *
	 * @since   4.0.0
	 * @throws  \RuntimeException
	 */
	public function loadRenderer($type)
	{
		// Need to force everything to go to the HTML renderers or we duplicate all the things
		return $this->factory->createRenderer($this, $type, 'html');
	}

	/**
	 * Render the document
	 *
	 * @param   boolean  $cache   If true, cache the output
	 * @param   array    $params  Associative array of attributes
	 *
	 * @return  string   The rendered data
	 *
	 * @since   1.7.0
	 */
	public function render($cache = false, $params = array())
	{
		// If no error object is set return null
		if (!isset($this->_error))
		{
			return;
		}

		// Set the status header
		$status = $this->_error->getCode();

		if ($status < 400 || $status > 599)
		{
			$status = 500;
		}

		$errorReporting = CmsFactory::getApplication()->get('error_reporting');

		if ($errorReporting === "development" || $errorReporting === "maximum")
		{
			$status .= ' ' . str_replace("\n", ' ', $this->_error->getMessage());
		}

		CmsFactory::getApplication()->setHeader('status', $status);

		// Set variables
		$this->debug = $params['debug'] ?? false;
		$this->error = $this->_error;

		$params['file'] = 'error.php';

		return parent::render($cache, $params);
	}

	/**
	 * Render the backtrace
	 *
	 * @return  string  The contents of the backtrace
	 *
	 * @since   1.7.0
	 */
	public function renderBacktrace()
	{
		// If no error object is set return null
		if (!isset($this->_error))
		{
			return;
		}

		// The back trace
		$backtrace = $this->_error->getTrace();

		// Add the position of the actual file
		array_unshift($backtrace, array('file' => $this->_error->getFile(), 'line' => $this->_error->getLine(), 'function' => ''));

		return LayoutHelper::render('joomla.error.backtrace', array('backtrace' => $backtrace));
	}
}