<?php
namespace gnomephp;

/**
 * Configuation class.
 * It can get configuraiton files like YAML, parse them , and then you can get config values from the file.
 * 
 * @author peec
 *
 */
class Configuration{
	static private $configs=array();
	
	
	/**
	 * 
	 * Gets a configuration value from the config directory.
	 * E.g. you can create a file in the application/config folder named $file and get it with.
	 * 
	 * Config file must be in YAML format.
	 * 
	 * @param string $file name of file ( without .yml extension ).
	 * @param string $key ( If you want you can access a specific key.
	 * @throws ConfigurationException
	 */
	static public function get($file, $key=null, $suffix='.yml'){
		// If app constant is not set, return null.
		if (@constant('GNOME_APP_PATH') === null)return null;
		// Only include these once. There for we create a cache in self::$configs.
		if (!isset(self::$configs[$file])){
			$path = GNOME_APP_PATH . DIRECTORY_SEPARATOR . 'config' . DIRECTORY_SEPARATOR . $file . $suffix;	
			if (!file_exists($path))throw new ConfigurationException("Tried to access config file $file. File location: $path");
			
			
			
			self::$configs[$file] = \gnomephp\yaml\sfYaml::load($path);
		}
		
		if ($key===null && isset(self::$configs[$file]))return self::$configs[$file];
		if ($key !== null && isset(self::$configs[$file][$key])) return self::$configs[$file][$key];
	}
	
	
}