<?php
/************************************************************************
 * MXChange v0.2.1                                    Start: 06/26/2004 *
 * ===============                              Last change: 07/01/2005 *
 *                                                                      *
 * -------------------------------------------------------------------- *
 * File              : load_extensions.php                              *
 * -------------------------------------------------------------------- *
 * Short description : Load all extensions                              *
 * -------------------------------------------------------------------- *
 * Kurzbeschreibung  : Alle Erweiterungen laden                         *
 * -------------------------------------------------------------------- *
 * @TODO Rewrite this whole file to load_cache-extensions.php           *
 * -------------------------------------------------------------------- *
 * $Revision::                                                        $ *
 * $Date::                                                            $ *
 * $Tag:: 0.2.1-FINAL                                                 $ *
 * $Author::                                                          $ *
 * Needs to be in all Files and every File needs "svn propset           *
 * svn:keywords Date Revision" (autoprobset!) at least!!!!!!            *
 * -------------------------------------------------------------------- *
 * Copyright (c) 2003 - 2008 by Roland Haeder                           *
 * For more information visit: http://www.mxchange.org                  *
 *                                                                      *
 * This program is free software; you can redistribute it and/or modify *
 * it under the terms of the GNU General Public License as published by *
 * the Free Software Foundation; either version 2 of the License, or    *
 * (at your option) any later version.                                  *
 *                                                                      *
 * This program is distributed in the hope that it will be useful,      *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 * GNU General Public License for more details.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with this program; if not, write to the Free Software          *
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,               *
 * MA  02110-1301  USA                                                  *
 ************************************************************************/

// Some security stuff...
if (!defined('__SECURITY')) {
	$INC = substr(dirname(__FILE__), 0, strpos(dirname(__FILE__), '/inc') + 4) . '/security.php';
	require($INC);
}

// Init variables
EXT_INIT_CSS_FILES();
$add = '';

// Init cache instance and array
$GLOBALS['cache_instance'] = null;
$GLOBALS['cache_array'] = array();

// Skip loading extensions
if ((!isInstalled()) || (isInstalling())) {
	// Init filter system here
	initFilterSystem();

	// Skip loading
	return;
} // END - if

// Initialize array for "always keep active extensions"
$GLOBALS['cache_array']['active_extensions'] = array();

// By default no cache is set
$GLOBALS['cache_mode'] = 'no';

// Load sql_patchrs extension alone
if (!LOAD_EXTENSION('sql_patches')) {
	// Could not load sql_patches! ARGH!!!
	trigger_error('Cannot load extension sql_patches.');
} // END - if

// Init inc pool array
INIT_INC_POOL();

//
// Load extensions
//
if (EXT_IS_ACTIVE('cache')) {
	// Load cache extension alone
	if (!LOAD_EXTENSION('cache')) {
		// Extension 'cache' was not loaded
		trigger_error('Cannot load extension cache.');
	} // END - if

	// Check extension cache
	switch (($GLOBALS['cache_instance']->loadCacheFile('extensions', true)) && ($GLOBALS['cache_instance']->extensionVersionMatches('sql_patches'))) {
		case true : $GLOBALS['cache_mode'] = 'load'; break;
		case false: $GLOBALS['cache_mode'] = 'init'; break;
	} // END - switch

	// Do we need to init the cache? But not in "CSS mode".
	if (($GLOBALS['cache_mode'] == 'init') && (getConfig('cache_exts') == 'Y') && (getOutputMode() == '0')) {
		// Init cache file
		$GLOBALS['cache_instance']->init('EXTENSIONS');
		$GLOBALS['cache_instance']->storeExtensionVersion('sql_patches');
	} elseif (getConfig('cache_exts') != 'Y') {
		// Cache will not be created for extensions
		$GLOBALS['cache_mode'] = 'skip';
	}
} // END - if

// Load cache?
if ($GLOBALS['cache_mode'] == 'load') {
	// Init include array
	$EXT_POOL = array();

	// Re-initialize handler
	$GLOBALS['cache_instance']->loadCacheFile('extensions', true);

	// Load extension data from cache file
	$EXT_DUMMY = $GLOBALS['cache_instance']->getArrayFromCache();

	// Is the cache file fine?
	if (!isset($EXT_DUMMY['ext_name'])) {
		// Cache file is damaged so kill it
		$GLOBALS['cache_instance']->destroyCacheFile();

		// Retry it
		require(__FILE__);
		return;
	} // END -  if

	// Begin with the cache preparation of extensions
	$EXT_NAMES = array();
	foreach ($EXT_DUMMY['ext_name'] as $k => $name) {
		// Load CSS file
		if ($EXT_DUMMY['ext_css'][$k] == 'Y') EXT_ADD_CSS_FILE($name . '.css');

		// Load extension file itself
		if ((($EXT_DUMMY['ext_active'][$k] == 'Y') || ($EXT_DUMMY['ext_keep'][$k] == 'Y') || (IS_ADMIN())) && (!in_array($name, array('sql_patches', 'cache')))) {
			$EXT_POOL[] = $name;
		} // END - if

		// Version number
		$EXT_DUMMY['ext_version'][$name] = $EXT_DUMMY['ext_version'][$k];
		unset($EXT_DUMMY['ext_version'][$k]);

		// Extension is active
		$EXT_DUMMY['ext_active'][$name] = $EXT_DUMMY['ext_active'][$k];
		unset($EXT_DUMMY['ext_active'][$k]);

		// Ext menu
		$EXT_DUMMY['ext_menu'][$name] = $EXT_DUMMY['ext_menu'][$k];
		unset($EXT_DUMMY['ext_menu'][$k]);

		// Extension id
		$EXT_DUMMY['ext_id'][$name] = $EXT_DUMMY['ext_id'][$k];
		$id = $EXT_DUMMY['ext_id'][$name];
		unset($EXT_DUMMY['ext_id'][$k]);

		// Add ext name
		$EXT_NAMES[$id] = $name;

		// Add deprecated flag (defaults to 'not deprecated')
		$EXT_DUMMY['ext_deprecated'][$name] = 'N';

		// Mark it as active extension
		$GLOBALS['cache_array']['active_extensions']['$name'] = $EXT_DUMMY['ext_keep'][$k];
		unset($EXT_DUMMY['ext_keep'][$k]);

		// Remove unneccessary data from memory
		unset($EXT_DUMMY['ext_css'][$k]);
	} // END - foreach

	// Write dummy array back
	$EXT_DUMMY['ext_name'] = $EXT_NAMES;
	unset($EXT_NAMES);

	// Loading cache is done so let's free some memory!
	unset($EXT_DUMMY['ext_keep']);
	unset($EXT_DUMMY['ext_css']);
	$GLOBALS['cache_array']['extensions'] = $EXT_DUMMY;
	unset($EXT_DUMMY);

	// No database load needed
	$res_ext_crt = false;

	// Load all extension files
	foreach ($EXT_POOL as $ext) {
		LOAD_EXTENSION($ext);
	} // END - foreach

	// Init filter system
	initFilterSystem();

	// Load more cache files (like admins)
	loadIncludeOnce('inc/load_cache.php');

	// Remove array
	unset($EXT_POOL);
} else {
	// If current user is not admin load only activated extensions. But load
	// them all if we are going to init the cache files. The admin shall use
	// every available extension for testing purposes.
	if ((!IS_ADMIN()) && ($GLOBALS['cache_mode'] != 'init')) $add = " WHERE `ext_active`='Y'";

	if (GET_EXT_VERSION('sql_patches') >= '0.0.6') {
		// Query with CSS file from DB
		$res_ext_crt = SQL_QUERY("SELECT id AS ext_id, ext_name, ext_has_css AS ext_css, ext_active, ext_version
FROM `{!_MYSQL_PREFIX!}_extensions`" . $add . "
ORDER BY ext_name", __FILE__, __LINE__);
	} else {
		// Old obsolete query string
		$res_ext_crt = SQL_QUERY("SELECT id AS ext_id, ext_name, ext_name, ext_active, ext_version
FROM `{!_MYSQL_PREFIX!}_extensions`" . $add . "
ORDER BY ext_name", __FILE__, __LINE__);
	}
}

// Array for removed but not uninstalled extensions
$DEL = array();

// At least one found?
if ((SQL_NUMROWS($res_ext_crt) > 0) && ((($GLOBALS['cache_mode'] == 'init') && (getOutputMode() != '1') && (getOutputMode() != '-1')) || ($GLOBALS['cache_mode'] == 'no'))) {
	// Extensions are registered so we load them
	while ($content = SQL_FETCHARRAY($res_ext_crt)) {
		// Get menu entry
		$content['ext_menu'] = 'N';
		if (MODULE_HAS_MENU($content['ext_name'], true)) {
			$content['ext_menu'] = 'Y';
		} // END - if

		// Generate FQFN for extension
		$FQFN = sprintf("%sinc/extensions/ext-%s.php", constant('PATH'), $content['ext_name']);

		// Does the extension file exists?
		if (isFileReadable($FQFN)) {
			// By default no extension is always active, except sql_patches
			EXT_SET_ALWAYS_ACTIVE('N');

			// Load extension
			if (($content['ext_name'] != 'sql_patches') && (($content['ext_name'] != 'cache') || (!EXT_IS_ACTIVE('cache')))) {
				// Load extension
				LOAD_EXTENSION($content['ext_name']);
			} else {
				// Keep sql_patches always active
				EXT_SET_ALWAYS_ACTIVE('Y');
			}

			// Transfer EXT_ALWAYS_ACTIVE flag
			$content['ext_keep'] = EXT_GET_ALWAYS_ACTIVE();

			// CSS file handling:
			if ((!isset($content['ext_css'])) || ($content['ext_css'] == 'Y')) {
				// Create FQFN for the CSS file
				$FQFN = sprintf("%stheme/%s/css/%s.css", constant('PATH'), getCurrentTheme(), $content['ext_name']);

				// Is the file there?
				if (isFileReadable($FQFN)) {
					// CSS file for extension was found (use only relative path for now!)
					EXT_ADD_CSS_FILE($content['ext_name'] . '.css');
					$content['ext_css'] = 'Y';
				} else {
					// Don't load CSS file
					$content['ext_css'] = 'N';
				}
			} // END - if

			// Shall we cache?
			if ($GLOBALS['cache_mode'] == 'init') {
				// Add cache row
				$GLOBALS['cache_instance']->addRow($content);
			} elseif ($GLOBALS['cache_mode'] == 'no') {
				// Remember this value for later usage
				$GLOBALS['cache_array']['active_extensions'][$content['ext_name']] = EXT_GET_ALWAYS_ACTIVE();
			}
		} elseif (!isFileReadable($FQFN)) {
			// Deleted extension file so we mark it for removal from DB
			$DEL[] = $content['ext_name'];
		}
	} // END - while

	// Init filter system
	initFilterSystem();

	if ($GLOBALS['cache_mode'] == 'init') {
		// Close cache file
		$GLOBALS['cache_instance']->finalize();

		// Load more cache files (like admins)
		loadIncludeOnce('inc/load_cache.php');
	} // END - if

	// Free memory
	SQL_FREERESULT($res_ext_crt);
} elseif (!EXT_IS_ACTIVE('cache')) {
	// Init filter system even when there are no extensions installed. #16
	initFilterSystem();
}

// Run the filter
runFilterChain('load_includes');

// Uninstall extensions that are no longer in our system
if (!empty($DEL[0])) {
	// Remove extensions from two tables: extension registry and tasks table
	foreach ($DEL as $del_ext) {
		// First remove entry from extensions table
		SQL_QUERY_ESC("DELETE LOW_PRIORITY FROM `{!_MYSQL_PREFIX!}_extensions` WHERE `ext_name`='%s' LIMIT 1",
		array($del_ext), __FILE__, __LINE__);

		// Remove (maybe?) found tasks (main task and possible updates
		SQL_QUERY_ESC("DELETE LOW_PRIORITY FROM `{!_MYSQL_PREFIX!}_task_system` WHERE subject='[%s:]' AND (task_type='EXTENSION' OR task_type='EXTENSION_UPDATE')",
		array($del_ext), __FILE__, __LINE__);
	} // END - foreach

	// I think it's not neccessary to run the optimization function here
	// because we didn't delete so much data from database. Can you aggree?
} // END - if

//
?>