<?php
/**
 * simple loginsystem for owls
 *
 * @brief simple loginsystem for owls
 * @author Meillo  r e t u r n s <meillo@marmaro.de>
 */
class Loginsys {

  /// Consts

  /**
   * time in seconds till the session expires
   */
  const TIME_SESSION_EXPIRES = 1800;



  /// Constructors

  /**
   * starts the session
   * and puts an activity timestamp in it
   */
  public function __construct() {
    session_start();
    $this->heartbeat();
  }




  /// Methods


  /**
   * trys to log in with the given login data
   *
   * @param $loginname username
   * @param $password_md5 md5 password hash
   */
  public function login($loginname, $password_md5) {    // login ------------------------------------
    $rowuser = mysql_fetch_array(mysql_query("select * from ". DB_PREFIX ."User where loginname='$loginname' and password='$password_md5' "));
    if (mysql_affected_rows() == 1) {  // valid login
      $_SESSION[login][id] = $rowuser[id];
      $_SESSION[login][loginname] = $loginname;
      $_SESSION[login][logintime] = time();
    }
  }


  /**
   * logs the user out
   */
  public function logout() {    // logout ------------------------------------------------------------
    unset($_SESSION[login]);
  }


  /**
   * proves if the user is logged in and if he wan't to long inactive
   *
   * @return bool 'true' if user is logged in, else 'false'
   */
  public function loggedIn() {    // return login-status ---------------------------------------------
    return (isset($_SESSION[login][id]) && $_SESSION[login][logintime] > time()-self::TIME_SESSION_EXPIRES);
  }


  /**
   * writes the current timestamp into the session
   * this is relevant for the time of inactivity
   */
  public function heartbeat() {
    if ($this->loggedIn()) {
      $_SESSION[login][logintime] = time();
    }
  }



  /// Getter and Setter


  /**
   * @return user id
   */
  public function getUserId() {
    return $_SESSION[login][id];
  }

  /**
   * @return user name
   */
  public function getLoginname() {
    return $_SESSION[login][loginname];
  }

}


?>