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<?php (defined('BASEPATH')) OR exit('No direct script access allowed');

(defined('EXT')) OR define('EXT', '.php');

global $CFG;

/* get module locations from config settings or use the default module location and offset */

is_array(Modules::$locations = $CFG->item('modules_locations')) OR Modules::$locations = array(

	APPPATH.'modules/' => '../modules/',

);

/* PHP5 spl_autoload */

spl_autoload_register('Modules::autoload');

/**

 * Modular Extensions - HMVC

 *

 * Adapted from the CodeIgniter Core Classes

 * @link	http://codeigniter.com

 *

 * Description:

 * This library provides functions to load and instantiate controllers

 * and module controllers allowing use of modules and the HMVC design pattern.

 *

 * Install this file as application/third_party/MX/Modules.php

 *

 * @copyright	Copyright (c) 2011 Wiredesignz

 * @version 	5.4

 * 

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 * 

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 * 

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 **/

class Modules

{

	public static $routes, $registry, $locations;

	/**

	* Run a module controller method

	* Output from module is buffered and returned.

	**/

	public static function run($module) {

		$method = 'index';

		if(($pos = strrpos($module, '/')) != FALSE) {

			$method = substr($module, $pos + 1);		

			$module = substr($module, 0, $pos);

		}

		if($class = self::load($module)) {

			if (method_exists($class, $method))	{

				ob_start();

				$args = func_get_args();

				$output = call_user_func_array(array($class, $method), array_slice($args, 1));

				$buffer = ob_get_clean();

				return ($output !== NULL) ? $output : $buffer;

			}

		}

		log_message('error', "Module controller failed to run: {$module}/{$method}");

	}

	/** Load a module controller **/

	public static function load($module) {

		(is_array($module)) ? list($module, $params) = each($module) : $params = NULL;	

		/* get the requested controller class name */

		$alias = strtolower(basename($module));

		/* create or return an existing controller from the registry */

		if ( ! isset(self::$registry[$alias])) {

			/* find the controller */

			list($class) = CI::$APP->router->locate(explode('/', $module));

			/* controller cannot be located */

			if (empty($class)) return;

			/* set the module directory */

			$path = APPPATH.'controllers/'.CI::$APP->router->fetch_directory();

			/* load the controller class */

			$class = $class.CI::$APP->config->item('controller_suffix');

			self::load_file($class, $path);

			/* create and register the new controller */

			$controller = ucfirst($class);	

			self::$registry[$alias] = new $controller($params);

		}

		return self::$registry[$alias];

	}

	/** Library base class autoload **/

	public static function autoload($class) {

		/* don't autoload CI_ prefixed classes or those using the config subclass_prefix */

		if (strstr($class, 'CI_') OR strstr($class, config_item('subclass_prefix'))) return;

		/* autoload Modular Extensions MX core classes */

		if (strstr($class, 'MX_') AND is_file($location = dirname(__FILE__).'/'.substr($class, 3).EXT)) {

			include_once $location;

			return;

		}

		/* autoload core classes */

		if(is_file($location = APPPATH.'core/'.$class.EXT)) {

			include_once $location;

			return;

		}		

		/* autoload library classes */

		if(is_file($location = APPPATH.'libraries/'.$class.EXT)) {

			include_once $location;

			return;

		}		

	}

	/** Load a module file **/

	public static function load_file($file, $path, $type = 'other', $result = TRUE)	{

		$file = str_replace(EXT, '', $file);		

		$location = $path.$file.EXT;

		if ($type === 'other') {			

			if (class_exists($file, FALSE))	{

				log_message('debug', "File already loaded: {$location}");				

				return $result;

			}	

			include_once $location;

		} else { 

			/* load config or language array */

			include $location;

			if ( ! isset($$type) OR ! is_array($$type))				

				show_error("{$location} does not contain a valid {$type} array");

			$result = $$type;

		}

		log_message('debug', "File loaded: {$location}");

		return $result;

	}

	/** 

	* Find a file

	* Scans for files located within modules directories.

	* Also scans application directories for models, plugins and views.

	* Generates fatal error if file not found.

	**/

	public static function find($file, $module, $base) {

		$segments = explode('/', $file);

		$file = array_pop($segments);

		$file_ext = (pathinfo($file, PATHINFO_EXTENSION)) ? $file : $file.EXT;

		$path = ltrim(implode('/', $segments).'/', '/');	

		$module ? $modules[$module] = $path : $modules = array();

		if ( ! empty($segments)) {

			$modules[array_shift($segments)] = ltrim(implode('/', $segments).'/','/');

		}	

		foreach (Modules::$locations as $location => $offset) {					

			foreach($modules as $module => $subpath) {			

				$fullpath = $location.$module.'/'.$base.$subpath;

				if ($base == 'libraries/' AND is_file($fullpath.ucfirst($file_ext))) 

					return array($fullpath, ucfirst($file));

				if (is_file($fullpath.$file_ext)) return array($fullpath, $file);

			}

		}

		return array(FALSE, $file);	

	}

	/** Parse module routes **/

	public static function parse_routes($module, $uri) {

		/* load the route file */

		if ( ! isset(self::$routes[$module])) {

			if (list($path) = self::find('routes', $module, 'config/') AND $path)

				self::$routes[$module] = self::load_file('routes', $path, 'route');

		}

		if ( ! isset(self::$routes[$module])) return;

		/* parse module routes */

		foreach (self::$routes[$module] as $key => $val) {						

			$key = str_replace(array(':any', ':num'), array('.+', '[0-9]+'), $key);

			if (preg_match('#^'.$key.'$#', $uri)) {							

				if (strpos($val, '$') !== FALSE AND strpos($key, '(') !== FALSE) {

					$val = preg_replace('#^'.$key.'$#', $val, $uri);

				}

				return explode('/', $module.'/'.$val);

			}

		}

	}

}