<?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);
}
//
global $EXT_CSS_FILES;
$EXT_CSS_FILES = array();
$ADD = "";

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

// Load default sql_patches extension if present
if (FILE_READABLE(PATH."inc/extensions/ext-sql_patches.php")) {
	// Load it...
	$EXT_LOAD_MODE = "";
	require_once(PATH."inc/extensions/ext-sql_patches.php");
	$cacheArray['active_extensions'] = array('sql_patches' => 'Y'); // KEEP THIS ALWAYS ACTIVE!
} else {
	// Initialize array for "always keep active extensions"
	$cacheArray['active_extensions'] = array();
}

//
// Load extensions
//
if (EXT_IS_ACTIVE("cache")) {
	// Load cache extension alone
	include_once(PATH."inc/libs/cache_functions.php");
	$cacheMode = "";
	include_once(PATH."inc/extensions/ext-cache.php");
	switch($cacheInstance->cache_file("extensions", true)) {
		case true : $cacheMode = "load"; break;
		case false: $cacheMode = "init"; break;
	}

	// Do not recreate cache file when it's switched off!
	if (($cacheMode == "init") && ($_CONFIG['cache_exts'] == "N")) $cacheMode = "skip";
} else {
	// Cache extension not active
	$cacheMode = "no";
}

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

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

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

	// Begin with the cache preparation of extensions
	$EXT_NAMES = array();
	foreach ($EXT_DUMMY['ext_name'] as $k => $name) {
		// Load functions file
		if ($EXT_DUMMY['ext_funcs'][$k] == "Y") {
			require_once(PATH."inc/libs/".$name."_functions.php");
		} // END - if

		// Load Language file
		if ($EXT_DUMMY['ext_lang'][$k] == "Y") {
			$INC = sprintf("%sinc/language/%s_%s.php", PATH, $name, GET_LANGUAGE());
			if (FILE_READABLE($INC)) {
				// Add it
				$EXT_POOL[] = $INC;
			}
		} // END - if

		// 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())) {
			$EXT_POOL[] = sprintf("%sinc/extensions/ext-%s.php", PATH, $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;

		// 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($EXT_DUMMY['ext_lang'][$k]);
		unset($EXT_DUMMY['ext_css'][$k]);
		unset($EXT_DUMMY['ext_funcs'][$k]);
	} // END - foreach

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

	// Close cache file
	$cacheInstance->cache_close();

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

	// No database load needed
	$res_ext_crt = false;

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

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

	// Remove array
	unset($EXT_POOL);
} else {
	// If current user is not admin load only activated extensions
	// The admin shall use every available extension for testing purposes
	if ((!IS_ADMIN()) && ($cacheMode != "init")) $ADD = " WHERE ext_active='Y'";

	if (GET_EXT_VERSION("sql_patches") >= "0.0.6") {
		// Query with CSS file from DB
		$res_ext_crt = SQL_QUERY("SELECT id, ext_name, ext_lang_file, ext_has_css, ext_active, ext_version
FROM "._MYSQL_PREFIX."_extensions".$ADD."
ORDER BY ext_name", __FILE__, __LINE__);
	} else {
		// Old obsulete query string
		$res_ext_crt = SQL_QUERY("SELECT id, ext_name, ext_lang_file, ext_name, ext_active, ext_version
FROM "._MYSQL_PREFIX."_extensions".$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") || ($cacheMode == "no")) && ($CSS != "1") && ($CSS != "-1")) {
	// Load theme management
	require_once(PATH."inc/theme-manager.php");

	// If we need to init the cache init it now
	if ($cacheMode == "init") $cacheInstance->cache_init("EXTENSIONS");

	// Extensions are registered so we load them
	while (list($EXT_ID, $name, $lang, $css, $active, $version) = SQL_FETCHROW($res_ext_crt)) {
		// Get menu entry
		$menu = "N";
		if (MODULE_HAS_MENU($name, true)) {
			$menu = "Y";
		} // END - if

		// Load extensions
		$file1 = sprintf("%sinc/extensions/ext-%s.php", PATH, $name);
		$file2 = $file1; $EXT_CSS = "N"; $EXT_ALWAYS_ACTIVE = "N";

		// Special functions file
		$file3 = sprintf("%sinc/libs/%s_functions.php", PATH, $name);

		// Does the extension file exists?
		if (FILE_READABLE($file1)) {
			// If there's no language file specified we don't need to load one... ;-)
			if (!empty($lang)) {
				// Create language file
				$file2 = sprintf("%sinc/language/%s_%s.php", PATH, $lang, GET_LANGUAGE());
			}

			if (FILE_READABLE($file3)) {
				// Special functions file
				$funcs = "Y";
				require_once($file3);
			} else {
				// Don't load functions file
				$funcs = "N";
			}

			// Do we need a language file?
			if (($file1 != $file2) && (FILE_READABLE($file2))) {
				// Load language file
				$lang = "Y";
				include($file2);
			} else {
				// Don't load language file
				$lang = "N";
			}

			// Load extension
			if ($name != "sql_patches") {
				// Load extension's file
				include_once($file1);
			} else {
				// KEEP sql_patches ALWAYS ACTIVE!
				$EXT_ALWAYS_ACTIVE = "Y";
			}

			if ($css == "Y") {
				$CSS_FILE = sprintf("%stheme/%s/css/%s.css", PATH, GET_CURR_THEME(), $name);
				if (FILE_READABLE($CSS_FILE)) {
					// CSS file for extension was found (use only relative path for now!)
					$EXT_CSS_FILES[] = $name.".css";
				} else {
					// Don't load CSS file
					$css = "N";
				}
			} // END - if

			// Add cache row
			if ($cacheMode == "init") {
				$cacheInstance->add_row(array(
					'ext_id'      => $EXT_ID,
					'ext_name'    => $name,
					'ext_lang'    => $lang,
					'ext_css'     => $css,
					'ext_menu'    => $menu,
					'ext_funcs'   => $funcs,
					'ext_active'  => $active,
					'ext_version' => $version,
					'ext_keep'    => $EXT_ALWAYS_ACTIVE,
				));
			} elseif ($cacheMode == "no") {
				// Remember this value for later usage
				$cacheArray['active_extensions'][$name] = $EXT_ALWAYS_ACTIVE;
			}
		} elseif (!FILE_READABLE($file1)) {
			// Deleted extension file so we mark it for removal from DB
			$DEL[] = $name;
		}
	} // END - while

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

		// Load more cache files (like admins)
		require_once(PATH."inc/load_cache.php");
	} // END - if

	// Free memory
	SQL_FREERESULT($res_ext_crt);
}

// Load include files if found
if (!empty($INC_POOL[0])) {
	foreach ($INC_POOL as $inc) {
		require_once($inc);
	} // END - foreach

	// Remove array
	unset($INC_POOL);
} // END - if

// 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 $name) {
		// First remove entry from extensions table
		SQL_QUERY_ESC("DELETE LOW_PRIORITY FROM "._MYSQL_PREFIX."_extensions WHERE ext_name='%s' LIMIT 1",
			array($name), __FILE__, __LINE__);

		// Remove (maybe?) found tasks (main task and possible updates
		SQL_QUERY_ESC("DELETE LOW_PRIORITY FROM "._MYSQL_PREFIX."_task_system WHERE subject LIKE '[%s:] %' AND (task_type='EXTENSION' OR task_type='EXTENSION_UPDATE')",
			array($name), __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

//
?>