<?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 (ereg(basename(__FILE__), $_SERVER['PHP_SELF']))
{
	$INC = substr(dirname(__FILE__), 0, strpos(dirname(__FILE__), "/inc") + 4) . "/security.php";
	require($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_exists(PATH."inc/extensions/ext-sql_patches.php") && is_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";

	// Load language
	if ($cacheMode == "load") include(PATH."inc/language/cache_".GET_LANGUAGE().".php");
} else {
	$cacheMode = "no";
}

if ($cacheMode == "load")
{
	// Load more cache files (like admins)
	require_once(PATH."inc/load_cache.php");

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

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

		// Load Language file
		if ($EXT_DUMMY['ext_lang'][$k] == 'Y')
		{
			$INC = sprintf(PATH."inc/language/%s_%s.php", $name, GET_LANGUAGE());
			if (file_exists($INC)) require_once($INC);
		}

		// 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()))
		{
			require_once(PATH."inc/extensions/ext-".$name.".php");
		}

		// Transfer version number and active status
		$EXT_DUMMY['ext_version'][$name] = $EXT_DUMMY['ext_version'][$k];
		unset($EXT_DUMMY['ext_version'][$k]);
		$EXT_DUMMY['ext_active'][$name] = $EXT_DUMMY['ext_active'][$k];
		unset($EXT_DUMMY['ext_active'][$k]);
		$EXT_DUMMY['ext_menu'][$name] = $EXT_DUMMY['ext_menu'][$k];
		unset($EXT_DUMMY['ext_menu'][$k]);
		$cacheArray['active_extensions']['$name'] = $EXT_DUMMY['ext_keep'][$k];
		unset($EXT_DUMMY['ext_keep'][$k]);
		$k2 = $EXT_DUMMY['ext_id'][$k];
		$EXT_DUMMY['ext_id'][$k2] = $name;
		if ($k2 != $k) unset($EXT_DUMMY['ext_id'][$k]);

		// Remove unneccessary data from memory
		unset($EXT_DUMMY['ext_lang'][$k]);
		unset($EXT_DUMMY['ext_css'][$k]);
		unset($EXT_DUMMY['ext_funcs'][$k]);
	}

	// 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
	$res_ext_crt = false;
}
 else
{
	// If current user is not admin load only activated extensions
	// The admin shall use every available extension for testing purposes
	if ((!IS_ADMIN()) && ($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
		$result_menu = SQL_QUERY_ESC("SELECT has_menu FROM "._MYSQL_PREFIX."_mod_reg WHERE module='%s' LIMIT 1",
		 array($name), __FILE__, __LINE__);
		list($menu) = SQL_FETCHROW($result_menu);
		//* DEBUG: */ echo "*".$name."/".$menu."*<br>";

		// An empty menu entry will be interpreted as N (no menu) to avoid problems
		if (empty($menu)) $menu = 'N';

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

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

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

			if (file_exists($file3) && is_readable($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 != $file2) && (file_exists($file2)) && (is_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')
			{
				$CSS_FILE = PATH."theme/".GET_CURR_THEME()."/css/".$name.".css";
				if (file_exists($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';
				}
			}

			// 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] = $EXT_ALWAYS_ACTIVE;
			}
		}
		 elseif (!file_exists($file1))
		{
			// Deleted extension file so we mark it for removal from DB
			$DEL[] = $name;
		}
	}

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

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

// Free memory
SQL_FREERESULT($res_ext_crt);

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

// 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
		$result = SQL_QUERY_ESC("DELETE LOW_PRIORITY FROM "._MYSQL_PREFIX."_extensions WHERE ext_name='%s' LIMIT 1",
		 array($name), __FILE__, __LINE__);

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

	// 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?
}
//
?>