import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class PhoneBook extends JFrame
{
    JTextField firstField = new JTextField(10);
    JTextField lastField = new JTextField(10);
    JTextField phoneField = new JTextField(10);
    JTextField emailField = new JTextField(10);
    
    JButton newButton = new JButton("New");
    JButton delButton = new JButton("Delete");
    JButton sortButton = new JButton("Sort");
    
    DefaultListModel listData = new DefaultListModel();
    JList list = new JList(listData);
    
    class AddHandler implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            String first = firstField.getText();
            String last = lastField.getText();
            String phone = phoneField.getText();
            String email = emailField.getText();
            
            if ( !( first.equals("") && last.equals("")))
            {
                PhoneEntry entry = new PhoneEntry(first, last, phone, email);
                listData.addElement(entry);
                firstField.setText("");
                lastField.setText("");
                // list.setSelectedIndex(listData.getSize()-1);
            }
        }
    }

    class DelHandler implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            int index = list.getSelectedIndex();
            if (index >= 0)
            {
                listData.remove(index);
                // list.setSelectedIndex(index);
            }
        }
    }
    
    class ListHandler implements ListSelectionListener
    {
        public void valueChanged(ListSelectionEvent e)
        {
            if (!e.getValueIsAdjusting())
            {
                int selected = list.getSelectedIndex();
                if (selected >= 0)
                {
                    PhoneEntry entry = (PhoneEntry)listData.get(selected);
                    firstField.setText(entry.getFirst());
                    lastField.setText(entry.getLast());
                    phoneField.setText(entry.getPhone());
                    emailField.setText(entry.getEmail());
                    
                }
            }
        }
    }
    
    class SortHandler implements ActionListener
    {

        public void actionPerformed(ActionEvent e)
        {
            PhoneEntry[] A = new PhoneEntry[listData.getSize()];

            // copy list into array
            for (int i = 0; i < A.length; i++)
            {
                A[i] = (PhoneEntry)listData.get(i);
            }
            // clear the list
            listData.removeAllElements();

            // sort array
            selectionSort(A);
            
            //copy array into list
            for (int i = 0; i < A.length; i++)
            {
                listData.addElement(A[i]);
            }
        }
        
    }
    
    public PhoneBook()
    {
        super("My PhoneBook");
    
        JPanel dataLabels = new JPanel(new GridLayout(4,1));
        dataLabels.add(new JLabel("First name: "));
        dataLabels.add(new JLabel("Last name: "));
        dataLabels.add(new JLabel("Phone number: "));
        dataLabels.add(new JLabel("Email address: "));
   
        JPanel dataFields = new JPanel(new GridLayout(4,1));
        dataFields.add(firstField);
        dataFields.add(lastField);
        dataFields.add(phoneField);
        dataFields.add(emailField);
        
        JPanel data = new JPanel(new BorderLayout());
        data.add("West", dataLabels);
        data.add("Center", dataFields);
        
        JPanel buttons = new JPanel(new FlowLayout());
        buttons.add(newButton);
        buttons.add(delButton);
        buttons.add(sortButton);
        
        JScrollPane listScroller = new JScrollPane(list);
        
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add("North", data);
        getContentPane().add("Center", listScroller);
        getContentPane().add("South", buttons);

        data.setBorder(new TitledBorder(new EtchedBorder(), "Address"));
        listScroller.setBorder(new TitledBorder(new EtchedBorder(), "Address List"));

        AddHandler addHandler = new AddHandler();
        newButton.addActionListener(addHandler);
        firstField.addActionListener(addHandler);
        lastField.addActionListener(addHandler);
        phoneField.addActionListener(addHandler);
        emailField.addActionListener(addHandler);
        
        delButton.addActionListener(new DelHandler());
        sortButton.addActionListener(new SortHandler());
        list.addListSelectionListener(new ListHandler());
        
        pack();
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
    
    private void selectionSort(PhoneEntry[] X)
    {
        for (int i = 0; i < X.length; i++)
        {
            int smallest = getMinIndex(X, i);
            swap(X, i, smallest);
        }
    }
    
    private static int getMinIndex(PhoneEntry[] X, int startHere)
    {
        int smallest = startHere;
        for (int i = startHere; i < X.length; i++)
        {
            if (X[i].compareToIgnoreCase(X[smallest]) < 0)
                smallest = i;
        }
        return smallest;
    }

    private static void swap(PhoneEntry[] X, int pos1, int pos2)
    {
        PhoneEntry tmp = X[pos1];
        X[pos1] = X[pos2];
        X[pos2] = tmp;
    }

    public static void main(String args[])
    {
        PhoneBook pb = new PhoneBook();
    }
}