<?php
class BasicUser {
	protected $user = NULL;
	public function __construct($username) {
		if(file_exists('user/'.strtolower($username).'.xml')) {
			$this->user = simplexml_load_file('user/'.strtolower($username).'.xml');
		}
		else $this->user = simplexml_load_string('<?xml version="1.0"?><user><username></username></user>');
	}
	public static function create($username) {
		$user = simplexml_load_string('<?xml version="1.0"?><user><username>'.$username.'</username></user>');
		file_put_contents('user/'.strtolower($user->username).'.xml', $user->asXML());
		return new User($username);
	}
	public function __toString() {
		return (string) $this->user->username;
	}
	public function __get($data) {
		if(!isset($this->user->$data)) return NULL;
		return $this->user->$data;
	}
	public function __set($data, $value) {
		$this->user->$data = $value;
	}
	public function save() {
		file_put_contents('user/'.strtolower($this->user->username).'.xml', $this->user->asXML());
	}
}
?><?php
class BasicSession {
	public $userobj = 'BasicUser';
	public $session = NULL;
	// 5 minute timeout
	const SESSION_TIMEOUT = 300;
	private $autosave = true;
	public function __construct($sessionid, $autosave = true) {
	
		$this->truncateSessions();
		$this->autosave = $autosave;
		if(file_exists('session/'.strtolower($sessionid).'.xml')) {
			$this->session = simplexml_load_file('session/'.strtolower($sessionid).'.xml');
			require_once($this->userobj.'.class.php');
			$userobj = $this->userobj;
			$this->user = new $userobj($this->session->username);
		}
		else {
			$sessionID = uniqid('session_');
			$this->session = simplexml_load_string('<?xml version="1.0"?><session><username></username><sessionid>'.$sessionID.'</sessionid></session>');
		}
	}
	public function kill() {
		unlink('session/'.strtolower($this->session->sessionid).'.xml');
	}
	public function __destruct() {
		if($this->autosave) {
			$this->save();
			$this->user->save();
		}
	}
	public function truncateSessions() {
		if ($handle = opendir('session')) {
			while (false !== ($file = readdir($handle))) {
				if(fileatime($file) + self::SESSION_TIMEOUT < time()) unlink($file);
			}
			closedir($handle);
		}
	}
	public function __get($data) {
		if($this->user->$data !== NULL) return $this->user->$data;
		if(!isset($this->session->$data)) return NULL;
		return $this->session->$data;
	}
	public function changeUser($user) {
		$this->session->username = $user;
		$this->user = new User($user);
	}
	public function __toString() {
		return (string) $this->session->sessionid;
	}
	public function save() {
		if(file_exists('session/'.strtolower($this->session->sessionid).'.xml')) file_put_contents('session/'.strtolower($this->session->sessionid).'.xml', $this->session->asXML());
	}
}
?>