package robin.maths;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class MesurePrincipale
{
    private static JTextField field1 = new JTextField();
    private static JTextField field2 = new JTextField();
    private static JFrame frame = new JFrame();
    private static JPanel labelPanel1 = new JPanel();
    private static JPanel labelPanel2 = new JPanel();
    private static JPanel labelPanel3 = new JPanel();
    private static JPanel labelPanel4 = new JPanel();
    private static JLabel label1 = new JLabel();
    private static JLabel label2 = new JLabel();
    private static JLabel label3 = new JLabel();

    public static void main(String[] args)
    {
        frame.setTitle("Caculateur de mesure principale");
        frame.setSize(450, 180);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setResizable(false);

        JPanel text = new JPanel();

        field1.setPreferredSize(new Dimension(150, 30));
        field1.setToolTipText("A");
        field2.setPreferredSize(new Dimension(150, 30));
        field2.setToolTipText("B");

        text.add(field1);
        text.add(field2);

        JPanel buttonPane = new JPanel();
        JButton button = new JButton("Calculer");
        button.setSize(30, 10);
        button.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent event)
            {
                tryProcess();
            }
        });
        buttonPane.add(button);

        frame.add(text, BorderLayout.NORTH);

        labelPanel1.setLayout(new BoxLayout(labelPanel1, BoxLayout.LINE_AXIS));
        labelPanel1.add(label1);
        labelPanel2.setLayout(new BoxLayout(labelPanel2, BoxLayout.LINE_AXIS));
        labelPanel2.add(label2);
        labelPanel3.setLayout(new BoxLayout(labelPanel3, BoxLayout.LINE_AXIS));
        labelPanel3.add(label3);

        labelPanel4.setLayout(new BoxLayout(labelPanel4, BoxLayout.PAGE_AXIS));
        labelPanel4.add(buttonPane);
        labelPanel4.add(labelPanel1);
        labelPanel4.add(labelPanel2);
        labelPanel4.add(labelPanel3);
        frame.add(labelPanel4);
        frame.setVisible(true);
    }

    private static void tryProcess()
    {
        String strA = field1.getText();
        String strB = field2.getText();

        long a = 0, b = 0;
        try
        {
            a = Long.parseLong(strA);
        }
        catch(NumberFormatException ex)
        {
            JOptionPane.showMessageDialog(null, "A est invalide", "Erreur", JOptionPane.ERROR_MESSAGE);
            return;
        }
        try
        {
            b = Long.parseLong(strB);
        }
        catch(NumberFormatException ex)
        {
            JOptionPane.showMessageDialog(null, "B est invalide", "Erreur", JOptionPane.ERROR_MESSAGE);
            return;
        }
        process(a, b);
    }

    private static void process(long a, long b)
    {
        if(b == 0)
        {
            JOptionPane.showMessageDialog(null, "B est nul", "Erreur", JOptionPane.ERROR_MESSAGE);
            return;
        }
        long b2 = (2 * b);
        long c = (a % b2);
        if(c > b)
        {
            c -= b2;
        }
        String output = c + "π";
        label1.setText(output);
        label2.setText("——");
        label3.setText(String.valueOf(b));
    }
}