/*
  a traffic generator
*/
public class Generator{
    //each road, on each time step, has PERCENT chance of receiving a Car
    private static final double PERCENT = 0.25;

    //helper function to randomly pick a direction
    private int randDirection(){
	double d = Math.random();
	if(d<0.333)return Car.LEFT;
	if(d<0.666)return Car.RIGHT;
	return Car.STRAIGHT;
    }

    //addTraffic can add cars to the queues
    //all newly instatiated Cars should use the provided time parameter
    public void addTraffic(Queue[] streets, int time){
	//for each street we randomly decide to add a Car
	for(int i=0;i<4;i++){
	    if(Math.random()<Generator.PERCENT){
		streets[i].enqueue(new Car(time, randDirection()));
	    }
	}
    }
}