public function init() {
       return new DatabaseManager('localhost','root','49254975','yumenet');
    }
    public function login(){
        if(isset($_POST['username'], $_POST['password'])) {
            if (empty($_POST['username']) && empty($_POST['password'])) {
                echo '<div id="alert">Bitte f&uuml;lle alle Felder aus!</div>';
            } else {
                $username = $_POST['username'];
                $password = $_POST['password'];
                $db = self::init()->getOut("SELECT * FROM yume_users WHERE username = '" . $username . "' AND password = '".sha1($password)."'");
                $db->execute();
                $output = $db->fetchObject();
                if ($output->username == $username && $output->password == sha1($password)) {
                    $_SESSION['username'] = $output->username;
                    $_SESSION['password'] = $output->password;
                    $_SESSION['token'] = rand(1000, 20);
                    header('Location: ./dashboard');
                } else {
                    echo '<div id="alert">Benutzername oder Passwort falsch</div>';
                }
            }
        }
    }
    public function register(){
        if(isset($_POST['re_username'], $_POST['re_password'], $_POST['re_password2'], $_POST['re_email'])) {
            if (empty($_POST['re_username']) && empty($_POST['re_password']) && empty($_POST['re_password2']) && empty($_POST['re_email'])) {
                echo '<div id="alert">Bitte f&uuml;lle alle Felder aus!</div>';
            } else {
                $username = $_POST['re_username'];
                $password = $_POST['re_password'];
                $db = self::init()->getOut("SELECT * FROM yume_users WHERE username = '" . $username . "'");
                $db->execute();
                $output = $db->fetchObject();
                if($output->num_rows > 0 ){
                    echo '<div class="error">Benutzername ist bereits vergeben!</div>';
                } else {
                    $db = self::init()->getOut("INSERT INTO yume_users (username, password, avatar) VALUES ('".$username."', '".sha1($password)."', 'yume-32')");
                    $db->execute();
                    $_SESSION['username'] = $username;
                    $_SESSION['token'] = rand(1000, 20);
                    header('Location: /dashboard');
                }
            }
        }
    }