import java.awt.Color;

public class CarMover extends MobileSimObject{
	// OVERVIEW: Moves the cars in a lane

	private boolean inTurn;
	private int dir;
	// Currently in the middle of a turn (used for coloring)

	public CarMover(int dir) {
		inTurn = false;
		this.dir = dir;
	}

	public void executeTurn() throws RuntimeException
	// Note: requires isInitialized is inherited from SimObject
	// EFFECTS: Calculates the position of cars in a lane based on which 
	//          lane the cars are traveling in.  Some lanes move left to right
	//          and some move right to left.
	//          If the car's space is occupied by the frog, the frog will die.

	{
		
		

		int oldy = getY();
		int newx = getX();
		
		if(dir > 0)
		{
			if(newx == 19)
			{
				grid.removeObjectAt(getX(), getY());
				newx = 0;
			}
			else
				newx += dir;
		}
		else
		{
			if(newx == 0)
			{
				grid.removeObjectAt(getX(), getY());
				newx = 19; 
			}
			else
				newx += dir;
		}
		
		

		synchronized(getGrid()){
			if(grid.getObjectAt(newx, oldy) != null){
				System.out.println("You're NASTAY!!!!"); 
				System.exit(1);
			}
			
			setLocation(newx, oldy);
			grid.repaint();
		}
			

	}

		
	

	public Color getColor() {
		if (getY() ==1 ) {
			return Color.white;
		} else if (getY()==2){
			return Color.cyan;
		}else if (getY()==3){
			return Color.white;
		}else if (getY()==4){
			return Color.cyan;
		}else {
			return Color.white;
		}
	} //@nowarn Post // ESC/Java doesn't know Color constants are not null
}