<?php
/**
 * Configuration
 * Configuration based in ini-files, readable via xpath style
 * 
 * @author Mick van der Most van Spijk <hide@address.com>
 * @version 2.0.1
 * @license BSD http://www.opensource.org/licenses/bsd-license.php
 */
class Config {
	private static $_settings = array();
	private static $_instance = NULL;
	private static $_dir;

	private function __construct($config_dir) {
		// chk configdir and read files
		$d =@ dir($config_dir);

		if (FALSE === $d) {
			throw new Exception("Config dir not found, unable to read configuration");
		}

		self::$_dir = $config_dir;

		// list confs
		$confs = array();
		while (false !== ($entry = $d->read())) {
			if (".." == $entry // current
			|| "." == $entry   // parent
			|| substr($entry,0,1) == '.' // hidden
			|| is_dir($entry)
			) {
				continue;
			}

			$confs[] = $entry;
		}
		$d->close();

		foreach ($confs as $file) {
			self::$_settings[basename($file, '.ini')] = parse_ini_file($config_dir.'/'.$file, TRUE);
		}
   	}

	public static function singleton($config_dir) {
		if (is_null(self::$_instance)) {
			self::$_instance = new Config($config_dir);
		}

		return self::$_instance;
	}

   	/**
   	 * Get a setting by section and setting name or by specifing a path
   	 * 
   	 * @param String section
   	 * @param String setting
   	 * or
   	 * @param Path ea section/setting
   	 * @return mixed value or empty string when not found
   	 */
   	public static function getSetting() {
		if (NULL === self::$_instance) {
			throw new Exception ('Config not instanciated');
		}

		$args = func_get_args();
   		$section = '';
   		$setting = '';
   		
   		if (0 == count($args)) {
   			throw new Exception('Please specify path or section and setting');
   		}

   		if (1 == count($args)) {
   			$args[0] = trim($args[0], '/');   			
   			$parts = explode("/", $args[0]);

			if (1 == count($parts)) {
				$ini = $parts[0];
			} elseif (2 == count($parts)) {
   				$ini = $parts[0];
   				$setting = $parts[1];
   			} elseif (3 == count($parts)) {
   				$ini = $parts[0];
   				$section = $parts[1];
   				$setting = $parts[2];
   			} else {
   				throw new Exception('Path is not correct, specify ini, section and setting or ini and setting');
   			}
   		} elseif (3 == count($args)) {
   			$ini = $args[0];
   			$section = $args[1];
   			$setting = $args[2];
   		}
   		
   		if (isset(self::$_settings[$ini])) {
   			if ('' == $setting){
   				return self::$_settings[$ini];
   			} elseif ('' != $section) {
		   		if (isset(self::$_settings[$ini][$section])) {
		   			if (isset(self::$_settings[$ini][$section][$setting])) {
		   				return self::$_settings[$ini][$section][$setting];
		   			}
		   		}
   			} else {
	   			if (isset(self::$_settings[$ini][$setting])) {
	   				return self::$_settings[$ini][$setting];
	   			}
   			}
   		}

		throw new Exception(sprintf('Setting %s not found', $setting));
   	}
  
	public static function getIniFile($name) {
		if (NULL === self::$_instance) {
			throw new Exception ('Config not instanciated');
		}

		return parse_ini_file(self::$_dir.'/'.$name.".ini", TRUE);
	}
}
?>