/**
 * $RCSfile: BasicResolver.java,v $
 * $Revision: 1.1 $
 * $Date: 2007/07/02 17:41:07 $
 *
 * Copyright 2003-2005 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smackx.jingle.nat;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smackx.jingle.JingleSession;

/**
 * Basic Resolver takes all IP addresses of the interfaces and uses the first
 * non-loopback address. A very simple and easy to use resolver.
 */
public class BasicResolver extends TransportResolver {

	/**
	 * Constructor.
	 */
	public BasicResolver() {
		super();
	}

	@Override
	public void cancel() throws XMPPException {
		// Nothing to do here
	}

	@Override
	public void initialize() throws XMPPException {
		setInitialized();
	}

	/**
	 * Resolve the IP address.
	 * <p/>
	 * The BasicResolver takes the IP addresses of the interfaces and uses the
	 * first non-loopback, non-linklocal and non-sitelocal address.
	 */
	@Override
	public synchronized void resolve(JingleSession session)
			throws XMPPException {

		setResolveInit();

		clearCandidates();

		Enumeration ifaces = null;

		try {
			ifaces = NetworkInterface.getNetworkInterfaces();
		} catch (final SocketException e) {
			e.printStackTrace();
		}

		while (ifaces.hasMoreElements()) {

			final NetworkInterface iface = (NetworkInterface) ifaces
					.nextElement();
			final Enumeration iaddresses = iface.getInetAddresses();

			while (iaddresses.hasMoreElements()) {
				final InetAddress iaddress = (InetAddress) iaddresses
						.nextElement();
				if (!iaddress.isLoopbackAddress()
						&& !iaddress.isLinkLocalAddress()
						&& !iaddress.isSiteLocalAddress()) {
					final TransportCandidate tr = new TransportCandidate.Fixed(
							iaddress.getHostAddress() != null ? iaddress.getHostAddress()
									: iaddress.getHostName(), getFreePort());
					tr.setLocalIp(iaddress.getHostAddress() != null ? iaddress
							.getHostAddress() : iaddress.getHostName());
					addCandidate(tr);
					setResolveEnd();
					return;
				}
			}
		}

		try {
			ifaces = NetworkInterface.getNetworkInterfaces();
		} catch (final SocketException e) {
			e.printStackTrace();
		}

		while (ifaces.hasMoreElements()) {

			final NetworkInterface iface = (NetworkInterface) ifaces
					.nextElement();
			final Enumeration iaddresses = iface.getInetAddresses();

			while (iaddresses.hasMoreElements()) {
				final InetAddress iaddress = (InetAddress) iaddresses
						.nextElement();
				if (!iaddress.isLoopbackAddress()
						&& !iaddress.isLinkLocalAddress()) {
					final TransportCandidate tr = new TransportCandidate.Fixed(
							iaddress.getHostAddress() != null ? iaddress.getHostAddress()
									: iaddress.getHostName(), getFreePort());
					tr.setLocalIp(iaddress.getHostAddress() != null ? iaddress
							.getHostAddress() : iaddress.getHostName());
					addCandidate(tr);
					setResolveEnd();
					return;
				}
			}
		}

		try {
			final TransportCandidate tr = new TransportCandidate.Fixed(
					InetAddress.getLocalHost().getHostAddress() != null ? InetAddress
							.getLocalHost().getHostAddress() : InetAddress
							.getLocalHost().getHostName(), getFreePort());
			tr.setLocalIp(InetAddress.getLocalHost().getHostAddress() != null ? InetAddress
					.getLocalHost().getHostAddress() : InetAddress
					.getLocalHost().getHostName());
			addCandidate(tr);
		} catch (final Exception e) {
			e.printStackTrace();
		}
		setResolveEnd();

	}
}