/*
 * Copyright (C) 2017 Fabian Feitsch <info@fafeitsch.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package de.fafeitsch.lateness;

/**
 *
 * @author Fabian Feitsch <info@fafeitsch.de>
 */
public class UserToken {

    private final static long INVALIDATE_TIME_SECONDS = 3600;

    private final String username;

    private final long creationTime;

    private UserToken(String username, long creationTime) {
        if (username == null || username.equals("")) {
            throw new IllegalArgumentException("The username is either null or empty, this is not allowed.");
        }
        this.username = username;
        this.creationTime = creationTime;
    }

    public static UserToken create(String username) {
        long now = System.currentTimeMillis();
        return new UserToken(username, now);
    }

    public boolean isValid() {
        return System.currentTimeMillis() - creationTime <= INVALIDATE_TIME_SECONDS * 1000;
    }

    /**
     * Fails if {@link #isValid() } returns false.
     */
    public String getUsernameOrFail() {
        if (!isValid()) {
            throw new IllegalStateException("This usertoken is not valid any more!");
        }
        return username;
    }
}
