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

public class Stapler extends JFrame {
	// class constants
	private final int MAX_NUMBER_STAPLES = 100;
	private static Scanner scanner = new Scanner(System.in);
	
	// object attributes
	private int numberStaplesLeft = 0;
	private JButton button;
	
	// Stapler(): default constructor
	public Stapler() {
		System.out.println("Starting default constructor");
		sleep();
		this.setSize(350, 250);
		this.button = new JButton( String.valueOf(numberStaplesLeft), new ImageIcon("walking-stapler.gif")  );
		this.button.setBackground( Stapler.randomColor() );
		Font font = button.getFont();
		float size = 10*font.getSize();
		button.setFont( font.deriveFont(size) );
		
		this.empty();
		
		this.add(button);
		this.setVisible(true);
		this.drawStapler();
	}
	
	// empty(): remove all staples from the stapler
	public void empty() {
		System.out.println("Starting empty()");
		sleep();
		this.numberStaplesLeft = 0;
		this.drawStapler();
	}
	
	// punch(): use up a stapler
	public void punch() {
		System.out.println("Starting punch()");
		sleep();
		this.numberStaplesLeft = this.numberStaplesLeft - 1;
		this.drawStapler();
	}
	
	// numberLeft(): report the number of staples in the Stapler
	public int numberLeft() {
		System.out.println("Starting numberLeft()");
		sleep();
		int result = this.numberStaplesLeft;
		this.drawStapler();
		return result;
	}
	
	// toString(): produce a representation of the state of the Stapler
	public String toString() {
		sleep();
		String result = "Stapler: [ " + numberLeft() + " ]";
		return result;
	}
	
	// refill(): fully load stapler
	public void fill() {
		System.out.println("Starting fill()");
		sleep();
		this.numberStaplesLeft = MAX_NUMBER_STAPLES;
		this.drawStapler();
	}
	
	public void drawStapler() {
		button.setText( String.valueOf(this.numberStaplesLeft) );
	}
	
	public static Color randomColor() {
		Random variate = new Random();
		int r = variate.nextInt(256);
		int g = variate.nextInt(256);
		int b = variate.nextInt(256);
		
		return new Color (r,g, b);
	}
	
	public static void sleep() {
		scanner.nextLine();
	}
}