import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.*;

public class Main {
    private static int speed = 1;

    public static void gravity() {
        speed = speed + 1; // ubrzava jedan piksel kroz jednu promenu
    }

    public static void jump() {
        speed = -14; // speed se stavlja negativni da ide u suprotnom smeru na kratko
        // posto gravity povecava za jedan piksel preci ce iz negativnog u pozitivno
        // posle 14 krugova
    }

    public static void main(String[] args) {

        JFrame f = new JFrame();
        f.setLayout(null);
        f.setTitle("Birdy");
        f.setDefaultCloseOperation(3);
        f.setSize(800, 600);
        f.setVisible(true);

        JLayeredPane background = new JLayeredPane();
        background.setBounds(0, 0, 800, 600);
        background.setBackground(new Color(255, 100, 200));
        background.setOpaque(true);
        background.setLayout(null);
        background.setVisible(true);
        f.add(background);

        JLabel bird = new JLabel();
        bird.setBounds(100, 100, 50, 50);
        bird.setBackground(new Color(25, 25, 25));
        bird.setOpaque(true);
        background.add(bird);


        JLabel tube = new JLabel();

        f.addKeyListener(new KeyListener() {
            public void keyPressed(KeyEvent e) {
                if (e.getKeyCode() == 32) {
                    jump();
                }
            }

            public void keyReleased(KeyEvent arg0) {
            }

            public void keyTyped(KeyEvent arg0) {
            }
        });

        while (true) {
            boolean start = true;
            while (start == true) {

                //set location and change gravity speed
                bird.setLocation(bird.getX(), bird.getY() + speed);
                gravity();

                //tubes

                // if it hits top or bottom
                if (bird.getY() < background.getY() || bird.getY() + bird.getHeight() > background.getHeight()) {
                    System.out.println("OVER");
                    speed = 1; // reset
                    bird.setLocation(100, 100);
                    break; // exit second while
                }

                //if it hits tubes

                try {
                    Thread.sleep(16); // 1000/60 = ~16 (60fps)
                } catch (InterruptedException e) {
                }
                f.repaint();
            }

        }

    }

}