/** The user input encapsulation for the project.  At the time, you
    can set the desired heading of the rovers to any direction and
    cause an early shutdown. */
public class Shell implements Runnable {

    private Prodigy prodigy;
    private boolean quit = false;

    public Shell (Prodigy prodigy) {
	this.prodigy = prodigy;
    }

    public void run () {
	while (!quit && !prodigy.mapped()) {
	    try {
		int available = System.in.available();
		if (available == 0) continue;
		byte[] bytes = new byte[available];
		System.in.read(bytes);
		String command = new String(bytes).trim();

		if (command.equals("bye")) {
		    System.out.println("Shutting down...");
		    prodigy.readings = 2000000;
		    quit = true;
		}
		if (command.indexOf("head") != -1) {
		    String heading = command.replaceAll("head ","");
		    int degrees = new Integer(heading).intValue();
		    System.out.println("Setting new heading to "+degrees);
		    Rover.setDesiredHeading(degrees);
		}
		else {
		    System.out.println("Unknown command - "+command);
		}
	    } catch (java.io.IOException ioe) {}
	}
    }
}