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

public class Terninger {

    private JFrame vindu;
    private JSpinner spinner;
    private JPanel terningPanel;
    private JButton kasteKnapp;
    private Random random = new Random();
    private static final String[] TERNING_SIDER = {
        "\u2680",
        "\u2681",
        "\u2682",
        "\u2683",
        "\u2684",
        "\u2685",
    };

    public Terninger() {
        vindu = new JFrame("Terning-kaster");
        vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        vindu.setLayout(new BorderLayout(12, 0));
        // Nord: Antall terninger
        JPanel antallPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        antallPanel.add(new JLabel("Antall terninger"));
        spinner = new JSpinner(new SpinnerNumberModel(6, 1, 6, 1));
        class AntallTerninger implements ChangeListener {

            @Override
            public void stateChanged(ChangeEvent e) {
                oppdaterTerninger((int) spinner.getValue());
            }
        }
        spinner.addChangeListener(new AntallTerninger());
        antallPanel.add(spinner);
        vindu.add(antallPanel, BorderLayout.NORTH);
        // Senter: Terningene
        terningPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        vindu.add(terningPanel, BorderLayout.CENTER);
        // S?r: kasteknapp og sum
        JPanel kastePanel = new JPanel(new BorderLayout());
        kasteKnapp = new JButton("Kast");
        class KastKnapp implements ActionListener {

            @Override
            public void actionPerformed(ActionEvent e) {
                kastTerninger();
            }
        }
        kasteKnapp.addActionListener(new KastKnapp());
        kastePanel.add(kasteKnapp);
        vindu.add(kastePanel, BorderLayout.SOUTH);
        // oppdateringen
        oppdaterTerninger(6);
        vindu.pack();
        vindu.setLocationRelativeTo(null);
        vindu.setVisible(true);
    }

    private void oppdaterTerninger(int antall) {
        terningPanel.removeAll();
        for (int i = 0; i < antall; i++) {
            JLabel terningSide = new JLabel(TERNING_SIDER[0]);
            terningSide.setFont(new Font(Font.SANS_SERIF, Font.PLAIN, 72));
            terningPanel.add(terningSide);
        }
        terningPanel.revalidate();
        terningPanel.repaint();
    }

    private void kastTerninger() {
        int sum = 0;
        Component[] terninger = terningPanel.getComponents();
        for (Component terning : terninger) {
            int kast = random.nextInt(6);
            sum += kast + 1;
            ((JLabel) terning).setText(TERNING_SIDER[kast]);
        }
        kasteKnapp.setText(String.format("Kast, sum = %d", sum));
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(Terninger::new);
    }
}