package trafficlight;

public class TrafficLight {

	private boolean green = false;
	private boolean red = false;
	private int g = 0;
	private int time = 12;
	private int counter = 0;

	public TrafficLight(int g) {
		this.g = g;
		counter = g + time;
		red = true;
	}
	
	public void tick() {
		if( red && counter == 0 ) {
			green = true;
			red = false;
			counter = g;
		} else if( green && counter == 0 ) {
			green = false;
			red = true;
			counter = g + ( 2 * time );
		} else {
			counter--;
		}
	}
	
	public boolean isGreenLit() {
		return green;
	}
	
	public boolean isRedLit() {
		return red;
	}

	public static void main(String[] args) {
		TrafficLight tl = new TrafficLight( 10 );
		for( int i = 0; i < 500; i++ ) {
			tl.tick();
			System.out.println( i + " => G: " + tl.isGreenLit() + ", R: " + tl.isRedLit() );
		}
	}

}