import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.UIManager;

public class BinConverter2 {
    final static Font LABEL_FONT = new Font(Font.SANS_SERIF, Font.PLAIN, 35);
    final static Font BUTTON_FONT = new Font(Font.SANS_SERIF, Font.PLAIN, 30);

    public static void main(String[] args) {
        /* Setter opp vinduet */
        try {
            UIManager.setLookAndFeel(
                UIManager.getCrossPlatformLookAndFeelClassName());
        } catch (Exception e) {
            System.exit(1);
        }

        JFrame vindu = new JFrame("Binaertall Converter");
        vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        /* Hovedpanelen (tegneflaten) */
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(5, 1));
        vindu.add(panel);


        /* Tekst og knapper for binaertall */
        JLabel binLabel = new JLabel("Binaertall:");
        binLabel.setHorizontalAlignment(JLabel.CENTER);
        binLabel.setFont(LABEL_FONT);
        panel.add(binLabel);

        JLabel binTallLabel = new JLabel("");
        binTallLabel.setHorizontalAlignment(JLabel.CENTER);
        binTallLabel.setFont(LABEL_FONT);
        panel.add(binTallLabel);

        JPanel knappPanel = new JPanel();
        panel.add(knappPanel);
        lagTallKnapper(binTallLabel, knappPanel);
        lagResetKnapp(binTallLabel, knappPanel);

        /* Tekst og knapp for konvertering til desimaltall */
        JPanel konverterPanel = new JPanel();
        panel.add(konverterPanel);

        JLabel desTallLabel = new JLabel("");
        desTallLabel.setHorizontalAlignment(JLabel.CENTER);
        desTallLabel.setFont(LABEL_FONT);

        lagKonverterKnapp(binTallLabel, desTallLabel, konverterPanel);
        panel.add(desTallLabel);
        

        /* Pakker sammen og viser vinduet */
        vindu.pack();
        vindu.setVisible(true);
    }

    // Hjelpemetode for aa lage knappene for "0" og "1"
    private static void lagTallKnapper(JLabel binTallLabel, JPanel panel) {
        JButton knapp0 = new JButton("0");
        JButton knapp1 = new JButton("1");

        class LeggTilTall implements ActionListener {
            String tall;

            public LeggTilTall(String tall) {
                this.tall = tall;
            }

            @Override
            public void actionPerformed(ActionEvent e) {
                binTallLabel.setText(binTallLabel.getText() + tall);
            }
        }

        knapp0.addActionListener(new LeggTilTall("0"));
        knapp1.addActionListener(new LeggTilTall("1"));

        knapp0.setFont(BUTTON_FONT);
        knapp1.setFont(BUTTON_FONT);

        panel.add(knapp0);
        panel.add(knapp1);
    }

    // Lager "C"-knappen, som resetter input
    private static void lagResetKnapp(JLabel binTallLabel, JPanel panel) {
        JButton knappC = new JButton("C");

        class FjernTekst implements ActionListener {
            JLabel label;
            
            public FjernTekst(JLabel label) {
                this.label = label;
            }

            @Override
            public void actionPerformed(ActionEvent e) {
                label.setText("");
            }
        }

        knappC.setFont(BUTTON_FONT);

        knappC.addActionListener(new FjernTekst(binTallLabel));
        panel.add(knappC);
    }

    // Lager knappen som konverterer input-tallet til desimal, og teksten som viser resultatet
    private static void lagKonverterKnapp(JLabel binTallLabel, JLabel desTallLabel, JPanel panel) {
        JButton konverterKnapp = new JButton("Konverter til desimal");
        

        class Konverter implements ActionListener {
            @Override
            public void actionPerformed(ActionEvent e) {
                String binary = binTallLabel.getText();
                if (!binary.equals("")) {
                    String decimal = Integer.parseInt(binary, 2) + "";
                    desTallLabel.setText(decimal);
                }
            }
        }
        konverterKnapp.addActionListener(new Konverter());

        konverterKnapp.setFont(BUTTON_FONT);
        panel.add(konverterKnapp);
    }
}