/* 
 *	Jeti, a Java Jabber client, Copyright (C) 2007 E.S. de Boer  
 *
 *  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
 *
 *	For questions, comments etc, 
 *	use the website at http://jeti.jabberstudio.org
 */

//created on Feb 21, 2007
package nu.fw.jeti.backend;


import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import javax.naming.LinkLoopException;

import nu.fw.jeti.jabber.Backend;
import nu.fw.jeti.jabber.elements.DiscoIdentity;
import nu.fw.jeti.jabber.elements.IQDiscoInfo;
import nu.fw.jeti.jabber.elements.IQXCaps;
import nu.fw.jeti.jabber.elements.InfoQuery;

/**
 * @author eric
 *
 */
public class OwnCapabilities {
	private IQXCaps caps;
	private List features;
	private List coreFeatures;
	private Map capabilities;
	boolean changed = true;
	private Backend backend;
	
	public OwnCapabilities(Backend backend){
		this.backend = backend;
		features = new ArrayList();
		coreFeatures = new ArrayList();
		capabilities = new HashMap();
		addCapability("http://jabber.org/protocol/disco#info");
		//addCapability("jabber:iq:last");
		addCapability("jabber:iq:oob");
		addCapability("jabber:iq:time");
		addCapability("jabber:iq:version");
		addCapability("jabber:x:event");
	}
			
	public void addCapability(String feature){
		coreFeatures.add(feature);
		features.add(feature);
	}
			
	
	public void addCapability(String capability,String feature){
		features.add(feature);
		Object cap = capabilities.get(capability);
		if(cap !=null){
			((List)cap).add(feature);
		}
		else {
			List list = new LinkedList();
			list.add(feature);
			capabilities.put(list,feature);
		}
		changed = true;
	}
	
	public void removeCapability(String capability,String feature){
		features.remove(feature);
		capabilities.remove(capability);
		changed = true;
	}
	
	private void createCaps(){
		StringBuffer buffer = new StringBuffer();
		for (Iterator i = capabilities.keySet().iterator(); i.hasNext();) {
			buffer.append(i.next());
			if(i.hasNext())buffer.append(' ');
		}
		caps = new IQXCaps("http://jeti.jabberstudio.org/caps",
							Start.VERSION,buffer.toString());
	}
		
	/**
	 * answers disco#info requests with capabilities info
	 * @param iq the Infoquery packet
	 * @param info The disco#info packet
	 */
	public void answerInfoRequest(InfoQuery iq, IQDiscoInfo info){
		List identities = new LinkedList();
		identities.add(new DiscoIdentity("client","pc",null));
		IQDiscoInfo returnInfo = null;
		String node = info.getNode(); 
		if(("http://jeti.jabberstudio.org/caps#"+Start.VERSION).equals(node)){
			returnInfo = new IQDiscoInfo(info.getNode(),identities,coreFeatures);
		}
		else if(node!=null && node.startsWith("http://jeti.jabberstudio.org/caps#")){
			List list =(List) capabilities.get(node.substring(node.lastIndexOf('#')+1,node.length()));
			if(list!=null) returnInfo = new IQDiscoInfo(node,identities,list);
		}
		else returnInfo = new IQDiscoInfo(node,identities,features);
		
		backend.send(new InfoQuery(iq.getFrom(),"result",iq.getID(),returnInfo));
    }
	
	/**
	 * gets a capabilties packet with all correct attributes set
	 * @return the capabilities packet
	 */
	public IQXCaps getCaps(){
		if(changed){
			createCaps();
			changed = false;
		}
		return caps;
	}
	
}