/*
 * A CCNx command line utility.
 *
 * Copyright (C) 2010 Palo Alto Research Center, Inc.
 *
 * This work is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 2 as published by the
 * Free Software Foundation. 
 * This work 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., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

package org.ccnx.ccn.utils;

import java.util.logging.Level;

import org.ccnx.ccn.KeyManager;
import org.ccnx.ccn.impl.support.Log;
import org.ccnx.ccn.impl.support.Tuple;
import org.ccnx.ccn.protocol.KeyLocator;
import org.ccnx.ccn.protocol.PublisherPublicKeyDigest;

/**
 * Command line utility for listing stored identity data (key locators). These
 * are currently stored insecurely: TODO store as signed data.
 * 
 * NOTE: We don't actually expect users to use this tool to view their identities; their
 * identities (even in the simple sense in which we use that term now) will usually be managed
 * by software and users never see them. This tool is for testing and debugging.
 */
public class ccnwhoami {

	public static void usage() {
		System.err.println("usage: ccnwhoami [-q] [-as <pathToKeystore> [-name <friendly name]] (-q == quiet)");
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			
			if ((args.length >= 1) && (args[0].equals("-h"))) {
				usage();
				return;
			}
			
			int offset = 0;
			if ((args.length > 1) && (args[0].equals("-q"))) {
				Log.setDefaultLevel(Level.WARNING);
				offset++;
			}

			if (args.length-offset > 4) {
				usage();
				return;
			}

			Tuple<Integer, KeyManager> tuple = CreateUserData.keyManagerAs(args, offset);

			// Can also use command line system properties and environment variables to
			// point this handle to the correct user.
			KeyManager km = ((null == tuple) || (null == tuple.second())) ? KeyManager.getDefaultKeyManager() : tuple.second();

			PublisherPublicKeyDigest [] ids = km.getAvailableIdentities();
			KeyLocator kl = null;
			
			System.out.println("Key ID					Identity");
			for (int i=0; i < ids.length; ++i) {
				kl = km.getStoredKeyLocator(ids[i]);
				if (null != kl) {
					System.out.println(ids[i] + "					" + kl);
				} else {
					System.out.println(ids[i]);
				}
			}
			
			km.close();
			KeyManager.closeDefaultKeyManager();

		} catch (Exception e) {
			handleException("Error: cannot initialize device. ", e);
			System.exit(-3);
		}
	}

	protected static void handleException(String message, Exception e) {
		Log.warning(message + " Exception: " + e.getClass().getName() + ": " + e.getMessage());
		Log.warningStackTrace(e);
	}
}