<?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                         *
 * -------------------------------------------------------------------- *
 *                                                                      *
 * -------------------------------------------------------------------- *
 * 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
global $EXT_CSS_FILES;
$EXT_CSS_FILES = array();
$ADD = "";

// Skip loading extensions
if ((!isBooleanConstantAndTrue('mxchange_installed')) || (isBooleanConstantAndTrue('mxchange_installing'))) return;

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

// By default no cache is set
$cacheMode = "no";

// Load sql_patchrs extension alone
LOAD_EXTENSION("sql_patches");

//
// Load extensions
//
if (EXT_IS_ACTIVE("cache")) {
	// Load cache extension alone
	LOAD_EXTENSION("cache");

	// Check extension cache
	switch (($cacheInstance->loadCacheFile("extensions", true)) && ($cacheInstance->extensionVersionMatches("sql_patches"))) {
		case true : $cacheMode = "load"; break;
		case false: $cacheMode = "init"; break;
	}

	// Do we need to init the cache?
	if (($cacheMode == "init") && (getConfig('cache_exts') == "Y")) {
		// Init cache file
		$cacheInstance->init("EXTENSIONS");
		$cacheInstance->storeExtensionVersion("sql_patches");
	} elseif (getConfig('cache_exts') != "Y") {
		// Cache will not be created for extensions
		$cacheMode = "skip";
	}
} // END - if

// Load cache?
if ($cacheMode == "load") {
	// Init include array
	$EXT_POOL = array();

	// Re-initialize handler
	$cacheInstance->loadCacheFile("extensions", true);

	// Load extension data from cache file
	$EXT_DUMMY = $cacheInstance->getArrayFromCache();

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

		// Retry it
		LOAD_INC(__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") $EXT_CSS_FILES[] = "".$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
		$cacheArray['active_extensions']['$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']);
	$cacheArray['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
	INIT_FILTER_SYSTEM();

	// Load more cache files (like admins)
	LOAD_INC_ONCE("inc/load_cache.php");

	// Remove array
	unset($EXT_POOL);
} else {
	// If current user is not admin load only activated extensions. But load
	// them all if we are going to init the cache files. The admin shall use
	// every available extension for testing purposes.
	if ((!IS_ADMIN()) && ($cacheMode != "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($res_ext_crt) > 0) && ((($cacheMode == "init") && ($CSS != "1") && ($CSS != "-1")) || ($cacheMode == "no"))) {
	// Load session management
	LOAD_INC_ONCE("inc/session.php");

	// 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

		// Load extensions
		$file1 = sprintf("%sinc/extensions/ext-%s.php", constant('PATH'), $content['ext_name']);

		// Does the extension file exists?
		if (FILE_READABLE($file1)) {
			// By default no extension is always active, except sql_patches
			$EXT_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_ALWAYS_ACTIVE = "Y";
			}

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

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

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

			// Shall we cache?
			if ($cacheMode == "init") {
				// Add cache row
				$cacheInstance->addRow($content);
			} elseif ($cacheMode == "no") {
				// Remember this value for later usage
				$cacheArray['active_extensions'][$content['ext_name']] = $EXT_ALWAYS_ACTIVE;
			}
		} elseif (!FILE_READABLE($file1)) {
			// Deleted extension file so we mark it for removal from DB
			$DEL[] = $content['ext_name'];
		}
	} // END - while

	// Init filter system
	INIT_FILTER_SYSTEM();

	if ($cacheMode == "init") {
		// Close cache file
		$cacheInstance->finalize();

		// Load more cache files (like admins)
		LOAD_INC_ONCE("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
	INIT_FILTER_SYSTEM();
}

// Run the filter
RUN_FILTER('load_includes', $INC_POOL);

// 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

//
?>