<?php
/*
 * UserDB Class by JPT (http://jpt.redio.de)
 */
class userdb{

	public $users;
	public $timeout = 86400; //After $timeout seconds of inactivity, the session will expire.
	private $db = "users.db";


	/*
	 * General
	 */
	function __construct(){
		$this -> load();
	}

	private function load(){
		$this -> users = (file_exists($this -> db)) ? unserialize(file_get_contents($this -> db)) : array();
	}

	private function save(){
		file_put_contents($this -> db, serialize($this -> users));
	}

	function __destruct(){
		$this -> logoutAll();
		$this -> save();
	}


	/*
	 * Userfunctions: adding, deleting, listing and verifying
	 */
	public function addUser($nick, $pw){
		$this -> users[$nick]["pw"] = md5($pw);
	}

	public function listUsers(){
		foreach($this -> users as $nick => $data){
			$users[$nick] = $data["level"];
		}
		return $users;
	}

	public function isUser($nick){
		return ($this -> users[$nick]) ? true : false;
}

	public function delUser($nick){
		unset($this -> users[$nick]);
	}


	/*
	 * User-Sessions: activity, verifying passwords, login + logout
	 */
	public function isActive($nick){
		if(isset($nick) && isset($this -> users[$nick]) && ((time() - $this -> users[$nick]["lastactive"]) < $this -> timeout)){
			$this -> update($nick);
			return true;
		}
		else{
			return false;
		}
	}

	public function update($nick){
		$this -> users[$nick]["lastactive"] = time();
		$this -> save();
	}

	public function getLastActivity($nick){
		return $this -> users[$nick]["lastactive"];
	}

	public function checkPW($nick, $pw){
 		return (md5($pw) == $this -> users[$nick]["pw"]) ? true : false;
	}

	public function updatePW($nick, $pw){
		$this -> users[$nick]["pw"] = md5($pw);
	}

	public function logout($nick){
		if($this -> isActive($nick)) $this -> users[$nick]["lastactive"] = 0;
		$this -> save();
	}

	public function logoutAll(){
		foreach($this -> users as $nick => $arr){
			$this -> users[$nick]["lastactive"] = 0;
		}
		$this -> save();
	}


	/*
	 * Additional stuff: userlevels
	 */
	public function getLevel($nick){
		if($this -> isActive($nick)) return $this -> users[$nick]["level"];
		else return 0;
	}

	public function setLevel($nick, $level){
		$this -> users[$nick]["level"] = $level;
	}


	/*
	 * Variable storage
	 */
	public function getVar($var, $nick){
		return (isset($this -> users[$nick]["var"][$var])) ? $this -> users[$nick]["var"][$var] : false;
	}

	public function setVar($var, $value, $nick){
		$this -> users[$nick]["var"][$var] = $value;
	}

	public function delVar($var, $nick){
		unset($this -> users[$nick]["var"][$var]);
	}

}

?>