/**
 *
 */
public class Shot implements Runnable {

    private int shotSpeed = 10;

    private int SHOT_WIDTH = 2;
    private int SHOT_HEIGHT = 5;

    private int x = 0;

    private int shotHeight = 0;

    boolean shotState = true;

    AlienArmy alienArmy = null;

    /**
     *
     */
    public Shot(int xVal, int yVal, AlienArmy aa) {
        x = xVal;//Set the shot direction
        shotHeight = yVal;
        alienArmy = aa;
        Thread thread = new Thread(this);
        thread.start();
    }

    /**
     *
     */
    private boolean moveShot() {

        //Now we need to see if we've hit anything!
        if (alienArmy.checkShot(x, shotHeight)) {
            //We hit something!
            System.out.println("We shot an alien!");
            shotState = false;
            return true;
        }

        shotHeight = shotHeight - 2;
        //We could have written this as
        //shotHeight -= 2;

        //Now check we haven't gone off the screen
        if (shotHeight < 0) {
            shotState = false;
            return true;
        }

        return false;
    }

    /**
     * Draw the image of the shot
     */
    public void drawShot(Graphics g) {
        if (shotState) {
            g.setColor(Color.white);
        } else {
            g.setColor(Color.black);
        }
        g.fillRect(x, shotHeight, SHOT_WIDTH, SHOT_HEIGHT);
    }

    public boolean getShotState() {
        return shotState;
    }

    /**
     * The thread that moves the shot
     */
    public void run() {
        while(true) {
            try {
                Thread.sleep(shotSpeed);
            } catch(InterruptedException ie) {
                //Ignore this exception
            }

            //Use this line for super bullets
            //
            //moveShot()
            //
            //or this for normal bullets
            //
            //if (moveShot()) {
            // break;
            //}

            if (moveShot()) {
                break;
            }

        }
    }

}