<?php
/**
 * @package    Joomla.Administrator
 *
 * @copyright  (C) 2005 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\Version;
use Joomla\Utilities\IpHelper;

// System includes
require_once JPATH_LIBRARIES . '/bootstrap.php';

// Installation check, and check on removal of the install directory.
if (!file_exists(JPATH_CONFIGURATION . '/configuration.php')
	|| (filesize(JPATH_CONFIGURATION . '/configuration.php') < 10)
	|| (file_exists(JPATH_INSTALLATION . '/index.php') && (false === (new Version)->isInDevelopmentState())))
{
	if (file_exists(JPATH_INSTALLATION . '/index.php'))
	{
		header('Location: ../installation/index.php');

		exit();
	}
	else
	{
		echo 'No configuration file found and no installation code available. Exiting...';

		exit;
	}
}

// Pre-Load configuration. Don't remove the Output Buffering due to BOM issues, see JCode 26026
ob_start();
require_once JPATH_CONFIGURATION . '/configuration.php';
ob_end_clean();

// System configuration.
$config = new JConfig;

// Set the error_reporting, and adjust a global Error Handler
switch ($config->error_reporting)
{
	case 'default':
	case '-1':

		break;

	case 'none':
	case '0':
		error_reporting(0);

		break;

	case 'simple':
		error_reporting(E_ERROR | E_WARNING | E_PARSE);
		ini_set('display_errors', 1);

		break;

	case 'maximum':
	case 'development': // <= Stays for backward compatibility, @TODO: can be removed in 5.0
		error_reporting(E_ALL);
		ini_set('display_errors', 1);

		break;

	default:
		error_reporting($config->error_reporting);
		ini_set('display_errors', 1);

		break;
}

define('JDEBUG', $config->debug);

if (JDEBUG || $config->error_reporting === 'maximum')
{
	// Set new Exception handler with debug enabled
	$errorHandler->setExceptionHandler(
		[
			new \Symfony\Component\ErrorHandler\ErrorHandler(null, true),
			'renderException'
		]
	);
}

/**
 * Correctly set the allowing of IP Overrides if behind a trusted proxy/load balancer.
 *
 * We need to do this as high up the stack as we can, as the default in \Joomla\Utilities\IpHelper is to
 * $allowIpOverride = true which is the wrong default for a generic site NOT behind a trusted proxy/load balancer.
 */
if (property_exists($config, 'behind_loadbalancer') && $config->behind_loadbalancer == 1)
{
	// If Joomla is configured to be behind a trusted proxy/load balancer, allow HTTP Headers to override the REMOTE_ADDR
	IpHelper::setAllowIpOverrides(true);
}
else
{
	// We disable the allowing of IP overriding using headers by default.
	IpHelper::setAllowIpOverrides(false);
}

unset($config);