<?php
/**
 * Piwik - Open source web analytics
 * 
 * @link http://piwik.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html Gpl v3 or later
 * @version $Id$
 * 
 * @package Piwik_Tracker
 */

/**
 * Simple class to access the configuration file
 * 
 * This is essentially a simple version of Zend_Config that we wrote 
 * because of performance reasons. 
 * The Tracker module can't afford a dependency with the Zend_Framework.
 * 
 * It's using the php.net/parse_ini_file function to parse the configuration files.
 * It can be used to access both user config.ini.php and piwik global.ini.php config file.
 * 
 * @package Piwik_Tracker
 */
class Piwik_Tracker_Config
{
	static private $instance = null;
	
	/**
	 * Returns singleton
	 *
	 * @return Piwik_Tracker_Config
	 */
	static public function getInstance()
	{
		if (self::$instance == null)
		{			
			$c = __CLASS__;
			self::$instance = new $c();
		}
		return self::$instance;
	}
	
	/**
	 * Contains configuration files values
	 *
	 * @var array
	 */
	public $config = array();
	protected $init = false;
	
	public function init($pathIniFileUser = null, $pathIniFileGlobal = null)
	{
		if(is_null($pathIniFileUser))
		{
			$pathIniFileUser = PIWIK_INCLUDE_PATH . '/config/config.ini.php'; 
		}
		if(is_null($pathIniFileGlobal))
		{
			$pathIniFileGlobal = PIWIK_INCLUDE_PATH . '/config/global.ini.php'; 
		}
		$this->configUser = parse_ini_file($pathIniFileUser, true);
		$this->configGlobal = parse_ini_file($pathIniFileGlobal, true);
	
		foreach($this->configUser as $section => &$sectionValues)
		{ 
			foreach($sectionValues as $name => &$value)
			{
				if(is_array($value)) 
				{
					$value = array_map("html_entity_decode", $value);
				} 
				else 
				{
					$value = html_entity_decode($value);
				}
			}
		}
		$this->init = true;
	}
	
	/**
	 * Magic get methods catching calls to $config->var_name
	 * Returns the value if found in the 
	 *
	 * @param string $name
	 * @return mixed The value requested, usually a string
	 * @throws exception if the value requested not found in both files
	 */
	public function __get( $name )
	{
		if(!$this->init)
		{
			$this->init();
		}
		
		$section = array();
		if(isset($this->configGlobal[$name]))
		{
			$section = array_merge($section, $this->configGlobal[$name]);
		}
		if(isset($this->configUser[$name]))
		{
			$section = array_merge($section, $this->configUser[$name]);
		}
		return count($section) ? $section : null;
	}
}