/************************************************************************************
 * Copyright (C) 2008 by Politehnica University of Bucharest and Rutgers University
 * All rights reserved.
 * Refer to LICENSE for terms and conditions of use.
 ***********************************************************************************/
package vnsim.applications.vitp.services;


import java.util.*;

import vnsim.applications.trafficview.SimulatedCarInfo;
import vnsim.applications.vitp.utils.*;
import vnsim.core.*;



public class VehicleTraffic extends Service {

	//this is an example of a service
	
	SimulatedCarInfo info;

	public VehicleTraffic(SimulatedCarInfo info) {
		this.info=info;
	}

	public VITPRequest satisfy(VITPRequest req, HashMap params) {

		//takes the request, reduces the count field in the URI, and adds a line
		//in the message body, of the type "speed=40";
		//params is a map of parameters of the local node (among them should be 'speed')
		System.out.println("VehicleTraffic modifying a request!");
		double speed=info.getSpeed();

		try{
			VITPRequest request=(VITPRequest) req;
			req.addToBody("speed="+speed);
			//reduce cnt by one
			Vector<String> rcs=URIParser.getRCExpressions(request.getURI());
			if(rcs==null) return req;
			for(int i=0;i<rcs.size();i++){
				if(((String)rcs.elementAt(i)).startsWith("cnt")) {
					String cntSir=(String)rcs.elementAt(i);
					int i1=cntSir.indexOf('=');
					if(i1==-1) return req;
					Integer old=new Integer(cntSir.substring(i1+1));
					int newcnt=old.intValue()-1;
					String newSir="cnt="+newcnt;
					rcs.removeElementAt(i);
					rcs.addElement(newSir);

					String oldUri=request.getURI();
					String newUri=URIParser.getURIFromParts(URIParser.getType(oldUri), URIParser.getTag(oldUri), 
						rcs, URIParser.getParams(oldUri));
					request.setURI(newUri);
					return request;
				}
			}
			return req;
		} catch (Exception ex){
			System.out.println("WARNING! EXCEPTION in VehicleTraffic:"+ex.toString());
			return req;
		}
	}
}