<?php 
/**
 *   Copyright (C) 2008  Stichting Phreamp.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 3 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, see <http://www.gnu.org/licenses/gpl.txt/>.
 * 
 *   The copright holder may be reached by emailing john@johnkleijn.nl
 */

require_once 'Phreamp/Loader.php';
require_once 'Phreamp/Config/Loader/Interface.php';

/**
 * Config class
 *
 */
class Phreamp_Config {
	
	/**
	 * Static instance
	 *
	 * @var Phreamp_Config
	 */
	private static $_default;
	
	/**
	 * Loader Strategy
	 *
	 * @var Phreamp_Config_Loader_Interface
	 */
	private $_loader = array();
	
	/**
	 * Configuration data
	 *
	 * @var array
	 */
	private $_data = array();
	
	/**
	 * Get default Instance
	 *
	 * @return Phreamp_Config
	 */
	public static function getDefault()
	{
		return self::$_default;
	}
	
	/**
	 * Set the default instance
	 *
	 * @param Phreamp_Config $config
	 */
	public static function setDefault(Phreamp_Config $config)
	{
		self::$_default = $config;
	}
	
	/**
	 * Constructor
	 *
	 */
	public function __construct(array $data = array())
	{
		$this->setData($data);
	}
	
	/**
	 * Set the configuration data
	 *
	 * @param array $data
	 */
	public function setData(array $data)
	{
		$this->_data = $data;	
	}
	
	/**
	 * Return the internal array
	 *
	 * @return array
	 */
	public function getData()
	{
		return $this->_data;
	}
	
	/**
	 * Return a value
	 *
	 * @return array|string
	 */
	public function get($key, $section = null, $subsection = null)
	{
		if($subsection !== null)
		{
			return @$this->_data[$section][$subsection][$key];
		}
		if($section !== null)
		{
			return @$this->_data[$section][$key];
		}
		else
		{
			return @$this->_data[$key];
		}
	}
	
	/**
	 * Set the loader object
	 *
	 * @param Phreamp_Config_Loader_Interface $loader
	 */
	public function setLoader(Phreamp_Config_Loader_Interface $loader)
	{
		$this->_loader = $loader; 
	}
	
	/**
	 * Get the loader
	 *
	 * @return Phreamp_Config_Loader_Interface
	 */
	public function getLoader()
	{
		return $this->_loader;
	}
	
	/**
	 * Cloning not allowed
	 *
	 */
	private function __clone()
	{}
	
	/**
	 * Create a new instance and load a file 
	 *
	 * @param string $filePath
	 * @return Phreamp_Config
	 */
	public static function loadFile($filePath)
	{
		$self = new self();
		
		$self->_loadFile($filePath);
		
		return $self;
	}
	
	/**
	 * Load a file
	 *
	 * @param string $filePath
	 */
	private function _loadFile($filePath)
	{
		if(!$this->getLoader())
		{
			$this->setLoader($this->fileLoaderFactory($filePath));
		}
		
		$this->setData($this->getLoader()->load($filePath));
	}
	
	/**
	 * Get a file loader object based on filename
	 *
	 * @param string $filePath
	 * @return Phreamp_Config_Loader_Interface
	 */
	public function fileLoaderFactory($filePath)
	{
		 $segs = explode('.', $filePath);
		 
		 $class = 'Phreamp_Config_Loader_' . ucfirst(end($segs));
		 
		 Phreamp_Loader::load($class);
		 
		 return new $class($filePath);
	}
}