/**
 * $Revision: $
 * $Date: $
 *
 * Copyright (C) 2007 Jive Software. All rights reserved.
 *
 * This software is published under the terms of the GNU Public License (GPL),
 * a copy of which is included in this distribution.
 */

package org.jivesoftware.wildfire.net;

import org.dom4j.Element;
import org.jivesoftware.wildfire.Connection;
import org.jivesoftware.wildfire.PacketRouter;
import org.jivesoftware.wildfire.auth.UnauthorizedException;
import org.jivesoftware.wildfire.multiplex.MultiplexerPacketHandler;
import org.jivesoftware.wildfire.multiplex.Route;
import org.jivesoftware.wildfire.session.ConnectionMultiplexerSession;
import org.jivesoftware.wildfire.session.Session;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmpp.packet.IQ;
import org.xmpp.packet.Message;
import org.xmpp.packet.PacketError;
import org.xmpp.packet.Presence;

/**
 * Handler of XML stanzas sent by Connection Managers.
 *
 * @author Gaston Dombiak
 */
public class MultiplexerStanzaHandler extends StanzaHandler {

    /**
     * Handler of IQ packets sent from the Connection Manager to the server.
     */
    private MultiplexerPacketHandler packetHandler;

    public MultiplexerStanzaHandler(PacketRouter router, String serverName, Connection connection) {
        super(router, serverName, connection);
    }

    protected void processIQ(final IQ packet) {
        if (session.getStatus() != Session.STATUS_AUTHENTICATED) {
            // Session is not authenticated so return error
            IQ reply = new IQ();
            reply.setChildElement(packet.getChildElement().createCopy());
            reply.setID(packet.getID());
            reply.setTo(packet.getFrom());
            reply.setFrom(packet.getTo());
            reply.setError(PacketError.Condition.not_authorized);
            session.process(reply);
            return;
        }
        // Process the packet
        packetHandler.handle(packet);
    }

    protected void processMessage(final Message packet) throws UnauthorizedException {
        throw new UnauthorizedException("Message packets are not supported. Original packets " +
                "should be wrapped by route packets.");
    }

    protected void processPresence(final Presence packet) throws UnauthorizedException {
        throw new UnauthorizedException("Message packets are not supported. Original packets " +
                "should be wrapped by route packets.");
    }

    /**
     * Process stanza sent by a client that is connected to a connection manager. The
     * original stanza is wrapped in the route element. Only a single stanza must be
     * wrapped in the route element.
     *
     * @param packet the route element.
     */
    private void processRoute(final Route packet) {
        if (session.getStatus() != Session.STATUS_AUTHENTICATED) {
            // Session is not authenticated so return error
            Route reply = new Route(packet.getStreamID());
            reply.setID(packet.getID());
            reply.setTo(packet.getFrom());
            reply.setFrom(packet.getTo());
            reply.setError(PacketError.Condition.not_authorized);
            session.process(reply);
            return;
        }
        // Process the packet
        packetHandler.route(packet);
    }

    boolean processUnknowPacket(Element doc) {
        String tag = doc.getName();
        if ("route".equals(tag)) {
            // Process stanza wrapped by the route packet
            processRoute(new Route(doc));
            return true;
        }
        else if ("handshake".equals(tag)) {
            if (!((ConnectionMultiplexerSession)session).authenticate(doc.getStringValue())) {
                session.getConnection().close();
            }
            return true;
        }
        else if ("error".equals(tag) && "stream".equals(doc.getNamespacePrefix())) {
            session.getConnection().close();
            return true;
        }
        return false;
    }

    String getNamespace() {
        return "jabber:connectionmanager";
    }

    boolean validateHost() {
        return false;
    }

    boolean createSession(String namespace, String serverName, XmlPullParser xpp, Connection connection)
            throws XmlPullParserException {
        if (getNamespace().equals(namespace)) {
            // The connected client is a connection manager so create a ConnectionMultiplexerSession
            session = ConnectionMultiplexerSession.createSession(serverName, xpp, connection);
            if (session != null) {
                packetHandler = new MultiplexerPacketHandler(session.getAddress().getDomain());
            }
            return true;
        }
        return false;
    }
}
