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/**
 * Write a description of class Rekursi_TowerOFHanoi here.
 *
 * Samuel Berkat Hulu
 * 5025201055
 *
 * @version 5.0 Tugas Sturktur data 4 Juni 2021
 */
import java.awt.Toolkit;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Stack;
import java.util.EmptyStackException;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;

//disk class
class TowerStack extends Stack<Integer> {

    public void display(int x, int y, Graphics g) {
        for(int i = 0; i < size(); i++) {
            int width = 20*((Integer)get(i)).intValue();
            g.setColor(Color.green);
            g.fillRoundRect(x-width/2,y-10*(i+1),width+1,10,10,10);
            g.setColor(Color.red);
            g.drawRoundRect(x-width/2,y-10*(i+1),width+1,10,10,10);
        }
    }

}


public class Towers_Of_Hanoi {
    JFrame theFrame;
    JLabel promptN;
    int n;
    int moves;
    JTextField inputN;
    JPanel one;
    JScrollPane inputPane;
    final int WIDTH = 650;
    final int HEIGHT = 500;
    final int XLEFT = 110;
    final int XMIDDLE = 320;
    final int XRIGHT = 520;
    final int YDOWN = 280;
    final int YUP = 170;
    final int WIDTHINC = 110;
    final int HEIGHTINC = 220;
    Graphics g;
    TowerStack tow1 = new TowerStack();
    TowerStack tow2 = new TowerStack();
    TowerStack tow3 = new TowerStack();

    public Towers_Of_Hanoi() {
        theFrame = new JFrame("Towers of Hanoi");
        Toolkit tk = Toolkit.getDefaultToolkit();
        theFrame.setSize(WIDTH,HEIGHT);
        theFrame.setLocation(tk.getScreenSize().width/4,tk.getScreenSize().height/4);
        theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container content = theFrame.getContentPane();
        content.setBackground(Color.white);
        content.setLayout(new FlowLayout(FlowLayout.CENTER,10,10));
        one = new JPanel();
        promptN= new JLabel("Enter the number of disks (1-10): ");
        one.add(promptN);
        inputN= new JTextField(5);
        inputN.addActionListener(new inputNAction());
        one.add(inputN);
        one.setBackground(Color.green);
        inputPane = new JScrollPane(one);
        content.add(inputPane);
        theFrame.setVisible(true);
    }

    public static void main(String[] args) {
        new Towers_Of_Hanoi();
    }

    public void moveDisks(int n, TowerStack source, TowerStack dest, TowerStack aux){
        if ( n == 0 ) return;
        moveDisks(n-1,source,aux,dest);
        dest.push( source.pop());
        moves++;
        drawTowers(g);
        moveDisks(n-1,aux,dest,source);
    }

    public void drawLines(Graphics g) {
        g.drawLine(XLEFT,YDOWN,XLEFT,YUP);
        g.drawLine(XMIDDLE,YDOWN,XMIDDLE,YUP);
        g.drawLine(XRIGHT,YDOWN,XRIGHT,YUP);
        g.drawLine(10,YDOWN,HEIGHTINC,YDOWN);
        g.drawLine(10+WIDTHINC,YDOWN,2*HEIGHTINC,YDOWN);
        g.drawLine(10+2*WIDTHINC,YDOWN,3*HEIGHTINC,YDOWN);
    }

    public void drawTowers(Graphics g) {
        g.setColor(Color.white);
        g.fillRect(0,75,WIDTH,HEIGHT-75);
        g.setColor(Color.green);
        drawLines(g);
        tow1.display(XLEFT,YDOWN,g);
        tow2.display(XMIDDLE,YDOWN,g);
        tow3.display(XRIGHT,YDOWN,g);
        try{Thread.sleep(500);}catch(Exception e){}
    }

    class inputNAction implements ActionListener {

        public void actionPerformed(ActionEvent A){
            try{
                n=Integer.parseInt(inputN.getText());
            } catch(NumberFormatException e){
                inputN.setText("1 to 10");
                inputN.selectAll();
                return;
            }
            if( n < 1 || n > 10 ){
                inputN.setText("1 to 10");
                inputN.selectAll();
                return;
            }
            inputN.setText("");
            moves = 0;
           tow1.setSize(0);
            for(int i = n; i > 0; i--) {
               tow1.push(i);
            }
           tow2.setSize(0);
           tow3.setSize(0);
            g = theFrame.getGraphics();
            drawTowers(g);
            moveDisks(n,tow1,tow3,tow2);
            g.drawString("___________________________"+n+" disks need "+moves+" move"+(moves>1?"s":"")+"___________________________",100,100);
        }

    }


}