import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public  class RollB extends JPanel implements ActionListener{

  int width = 700; int height = 250; //height, width of panel/window
  Timer clock = new Timer(20,this); //timer object with delay 20
   // wall values
  int NWall = 0; int WWall = 0; int EWall = width; int SWall = height;
   // initial ball directions: h increasing by 3, v by 2
  int h,v, balls = 20;
  int oldH, oldV, theSpeed;
   // initial position of ball
  int x = 125; int y = 21;

  Ball[] ball = new Ball[20];
  int count = 0;

  JMenu gameControls = new JMenu("Game Controls");
  JMenuItem quit = new JMenuItem("Quit");
  JMenuItem stop = new JMenuItem("Stop");
  JMenuItem start = new JMenuItem("Start");
  JMenuItem speed = new JMenuItem("Speed");
  JMenuItem newStart = new JMenuItem("New Start");
  JMenuItem ballCount = new JMenuItem("Ball Count");
  JTextField input;


  public RollB(JMenuBar b){
    b.add(gameControls);
    gameControls.add(quit);
    quit.addActionListener(this);
    gameControls.add(stop);
    stop.addActionListener(this);
    gameControls.add(start);
    start.addActionListener(this);
    gameControls.add(speed);
    speed.addActionListener(this);
    gameControls.add(newStart);
    newStart.addActionListener(this);
    gameControls.add(ballCount);
    ballCount.addActionListener(this);

    setPreferredSize(new Dimension(width,height));
    clock.start();
  }
  public int randGen() {
    if (Math.random()<.5) {
        double temp = 1000*Math.random();
        return (int)temp%6;
    } else {
        double temp = -1000*Math.random();
        return (int)temp%6;
    }

  }
  public void paintComponent(Graphics g){
    super.paintComponent(g);
    for(int i = 0; i <balls; i++) {
    h = randGen();
    v = randGen();
    ball[count] = new Ball(x,y,50,h,v);
    drawBalls(g);
    count++;
    }
  }

  public void drawBalls(Graphics g){
    g.fillOval(ball[count].getX(),ball[count].getY(),ball[count].getR(),ball[count].getR());
  }

   public void reflectBalls(){
     // when ball reaches (crosses) a wall, it flips (bounces)
    if (ball[count].getY() <= NWall) ball[count].flipVertical();
    else if (ball[count].getY() >= (SWall-50)) ball[count].flipVertical();
    else if (ball[count].getX() <= WWall) ball[count].flipHorizontal();
    else if (ball[count].getX() >= EWall-50) ball[count].flipHorizontal();
  }

   public void advanceBalls(){
     // ball moves ahead h,v units
     ball[count].advance();
   }

  public void actionPerformed(ActionEvent e){
    if (e.getSource() == clock) {
      advanceBalls();
      reflectBalls();
    }
    else if(e.getSource() == quit) {
        System.exit(0);
    }
    else if(e.getSource() == stop) {
    oldH = ball[count].getH();
    oldV = ball[count].getV();
    ball[count].setH(0);
    ball[count].setV(0);
    }
    else if(e.getSource() == start) {
    ball[count].setH(oldH);
    ball[count].setV(oldV);
    }
    else if(e.getSource() == speed) {
    theSpeed = Integer.parseInt(JOptionPane.showInputDialog("Enter a speed. (20 is default. Smaller = faster)"));
    clock.setDelay(theSpeed);
    }
    else if(e.getSource() == ballCount) {
    balls = Integer.parseInt(JOptionPane.showInputDialog("Enter a speed. (20 is default. Smaller = faster)"));
      repaint();
    }

      repaint();
    }
  }