<?php

namespace Rhymix\Framework;

/**
 * The config class.
 */
class Config
{
	/**
	 * System configuration is stored here.
	 */
	protected static $_config = array();
	
	/**
	 * Location of configuration files.
	 */
	public static $config_filename = 'files/config/config.php';
	public static $old_db_config_filename = 'files/config/db.config.php';
	public static $old_ftp_config_filename = 'files/config/ftp.config.php';
	public static $old_lang_config_filename = 'files/config/lang_selected.info';
	public static $default_config_filename = 'common/defaults/config.php';
	
	/**
	 * Load system configuration.
	 * 
	 * @return void
	 */
	public static function init()
	{
		if (file_exists(\RX_BASEDIR . self::$config_filename))
		{
			ob_start();
			self::$_config = (include \RX_BASEDIR . self::$config_filename);
			ob_end_clean();
		}
		else
		{
			if (self::$_config = Parsers\ConfigParser::convert())
			{
				self::save();
			}
		}
		return self::$_config;
	}
	
	/**
	 * Get all system configuration.
	 * 
	 * @return array
	 */
	public static function getAll()
	{
		return self::$_config;
	}
	
	/**
	 * Get default system configuration.
	 * 
	 * @return array
	 */
	public static function getDefaults()
	{
		return (include \RX_BASEDIR . self::$default_config_filename);
	}
	
	/**
	 * Get a system configuration value.
	 * 
	 * @param string $key
	 * @return mixed
	 */
	public static function get($key)
	{
		if (!count(self::$_config))
		{
			self::init();
		}
		$data = self::$_config;
		$key = explode('.', $key);
		foreach ($key as $step)
		{
			if ($key === '' || !isset($data[$step]))
			{
				return null;
			}
			$data = $data[$step];
		}
		return $data;
	}
	
	/**
	 * Set a system configuration value.
	 * 
	 * @param string $key
	 * @param mixed $value
	 * @return void
	 */
	public static function set($key, $value)
	{
		if (!count(self::$_config))
		{
			self::init();
		}
		$data = &self::$_config;
		$key = explode('.', $key);
		foreach ($key as $step)
		{
			$data = &$data[$step];
		}
		$data = $value;
	}
	
	/**
	 * Set all system configuration.
	 * 
	 * @param array $config
	 * @return void
	 */
	public static function setAll($config)
	{
		self::$_config = $config;
	}
	
	/**
	 * Save the current system configuration.
	 * 
	 * @param array $config (optional)
	 * @return bool
	 */
	public static function save($config = null)
	{
		if ($config)
		{
			self::setAll($config);
		}
		
		// Save the main config file.
		$buff = '<?php' . "\n" . '// Rhymix System Configuration' . "\n" . 'return ' . self::serialize(self::$_config) . ';' . "\n";
		$result = Storage::write(\RX_BASEDIR . self::$config_filename, $buff) ? true : false;
		
		// Save XE-compatible config files.
		$db_info = \Context::convertDBInfo(self::$_config);
		$ftp_info = $db_info->ftp_info;
		$db_info_without_ftp = clone $db_info;
		unset($db_info_without_ftp->ftp_info);
		$warning = '// DO NOT EDIT THIS FILE. CHANGES WILL NOT BE APPLIED.' . "\n" . '// TO CHANGE RHYMIX SYSTEM CONFIGURATION, EDIT config.php INSTEAD.';
		$buff = '<?php' . "\n\n" . $warning . "\n\n" . '$db_info = ' . self::serialize($db_info_without_ftp) . ';' . "\n";
		Storage::write(\RX_BASEDIR . self::$old_db_config_filename, $buff);
		$buff = '<?php' . "\n\n" . $warning . "\n\n" . '$ftp_info = ' . self::serialize($ftp_info) . ';' . "\n";
		Storage::write(\RX_BASEDIR . self::$old_ftp_config_filename, $buff);
		return $result;
	}
	
	/**
	 * Serialize a value for insertion into a PHP-based configuration file.
	 * 
	 * @param mixed $value
	 * @return string
	 */
	public static function serialize($value)
	{
		if (is_object($value))
		{
			return '(object)' . self::serialize((array)$value);
		}
		elseif (is_array($value))
		{
			$value = var_export($value, true);
			$value = preg_replace('/array \(\n/', "array(\n", $value);
			$value = preg_replace('/=>\s+array\(\n/', "=> array(\n", $value);
			$value = preg_replace('/array\(\s*\n\s*\)/', 'array()', $value);
			$value = preg_replace_callback('/\n(\x20+)/', function($m) {
				return "\n" . str_repeat("\t", intval(strlen($m[1]) / 2));
			}, $value);
			$value = preg_replace('/\n(\t+)[0-9]+ => /', "\n\$1", $value);
			return $value;
		}
		else
		{
			return var_export($value, true);
		}
	}
}