/*
 ** This file is part of Filius, a network construction and simulation software.
 ** 
 ** Originally created at the University of Siegen, Institute "Didactics of
 ** Informatics and E-Learning" by a students' project group:
 **     members (2006-2007): 
 **         André Asschoff, Johannes Bade, Carsten Dittich, Thomas Gerding,
 **         Nadja Haßler, Ernst Johannes Klebert, Michell Weyer
 **     supervisors:
 **         Stefan Freischlad (maintainer until 2009), Peer Stechert
 ** Project is maintained since 2010 by Christian Eibl <filius@c.fameibl.de>
 **         and Stefan Freischlad
 ** Filius 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) version 3.
 ** 
 ** Filius 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 Filius.  If not, see <http://www.gnu.org/licenses/>.
 */
package filius.software.rip;

import java.util.LinkedList;

import filius.hardware.NetzwerkInterface;
import filius.hardware.knoten.InternetKnoten;
import filius.software.system.InternetKnotenBetriebssystem;
import filius.software.vermittlungsschicht.IP;

/**
 * 
 * @author pyropeter
 * @author stefanf
 * 
 */
public class RIPTable {
    public static final int INFINITY = 16;
    /**
     * refresh interval in millis. the refresh is used to update the routing table in case of changes of the network
     * configuration. the only change that can occur during simulation mode is because of firewall re-configuration.
     */
    public static final int INTERVAL = 1000 * 30;
    public static final int TIMEOUT = INTERVAL * 5 / 2;

    public LinkedList<RIPRoute> routes;

    private long nextBeacon;

    private InternetKnotenBetriebssystem bs;

    public RIPTable(InternetKnotenBetriebssystem bs) {
        this.bs = bs;
        reset();
    }

    public void reset() {
        this.routes = new LinkedList<RIPRoute>();
        this.setNextBeacon(RIPUtil.getTime() + 1000);
    }

    public void addRoute(RIPRoute route) {
        routes.add(route);
    }

    public void addLocalRoutes(InternetKnoten knoten) {
        long netMask, netAddr;

        for (NetzwerkInterface nic : knoten.getNetzwerkInterfaces()) {
            netMask = IP.inetAton(nic.getSubnetzMaske());
            netAddr = IP.inetAton(nic.getIp()) & netMask;

            addRoute(new RIPRoute(0, IP.inetNtoa(netAddr), IP.inetNtoa(netMask), nic.getIp(), bs.primaryIPAdresse(),
                    nic.getIp(), 0));
        }
    }

    public RIPRoute search(String net, String mask) {
        for (RIPRoute route : routes) {
            if (route.getNetAddress().equals(net) && route.getNetMask().equals(mask)) {
                return route;
            }
        }
        return null;
    }

    public void check() {
        for (RIPRoute route : routes) {
            if (route.isExpired()) {
                route.hops = INFINITY;
            }
        }
    }

    public long getNextBeacon() {
        return nextBeacon;
    }

    public void setNextBeacon(long nextBeacon) {
        this.nextBeacon = nextBeacon;
    }
}
