package class8_2_PhoneBook.gui; // MSOE. Dr. Yoder. 02 February 2016.

import class8_2_PhoneBook.phonebook.Entry;
import class8_2_PhoneBook.phonebook.Handler;

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

/**
 * The main window for the phone book application.
 */
public class BookFrame extends JFrame {
    private Handler bookHandler = new Handler();
    private JList<Entry> list = new JList<>(new DefaultListModel<>());
    private EntryOptionPane entryOptionPane = new EntryOptionPane();

    /** Launch the application */
    public static void main(String[] ignored) {
        new BookFrame();
    }

    public BookFrame() {
        setTitle("Phone Book");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(300,200);

        setupMenus();

        add(list);
        populateList();

        list.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
                if (e.getClickCount() == 2) {
                    int index = list.locationToIndex(e.getPoint());
                    editItem(index);
                }
            }
        });
        list.addKeyListener(new KeyAdapter() {
            /**
             * Invoked when a key has been typed.
             * This event occurs when a key press is followed by a key release.
             * @param e event holding which key was pressed
             */
            @Override
            public void keyTyped(KeyEvent e) {
                if (KeyEvent.VK_DELETE == e.getKeyChar() ) {
                    deleteItem();
                } else if(KeyEvent.VK_ENTER == e.getKeyChar() ) {
                    editItem();
                } else if ((e.getKeyChar() == 14 /* N */) && ((e.getModifiers() & KeyEvent.CTRL_MASK) != 0)) {
                    addItem();
                } else if ((e.getKeyChar() == 26 /* Z */) && ((e.getModifiers() & KeyEvent.CTRL_MASK) != 0)) {
                    BookFrame.this.bookHandler.undo();
                    refreshList();
                } else if ((e.getKeyChar() == 25 /* Y */) && ((e.getModifiers() & KeyEvent.CTRL_MASK) != 0)) {
                    BookFrame.this.bookHandler.redo();
                    refreshList();
                }
            }
        });

        setVisible(true);
    }

    private void populateList() {
        bookHandler.addEntry("Babbage, Charles", "123-4567");
        bookHandler.addEntry("Liskov, Barbara", "123-7654");
        bookHandler.addEntry("Turing, Alan", "123-6382");
        bookHandler.addEntry("Kilby, Jack", "123-9876");
        bookHandler.addEntry("Hopper, Grace", "123-8765");
        refreshList();
    }

    private void setupMenus() {
        JMenuBar bar = new JMenuBar();
        setJMenuBar(bar);
        JMenu menu = new JMenu("Edit");
        bar.add(menu);

        JMenuItem item = new JMenuItem("Add Item (Ctrl-A)");
        menu.add(item);
        item.addActionListener(e -> addItem());

        item = new JMenuItem("Edit Item (ENTER)");
        menu.add(item);
        item.addActionListener(e -> editItem());

        item = new JMenuItem("Delete Item (DEL)");
        menu.add(item);
        item.addActionListener(e -> deleteItem());
    }

    /**
     * Prompt user for a new entry, and add it to the phone book.
     */
    private void addItem() {
        //How to show multiple fields in JOptionPanee
        //http://stackoverflow.com/questions/6555040/multiple-input-in-joptionpane-showinputdialog
        int result = entryOptionPane.showModalDialog();
        if (result == JOptionPane.OK_OPTION) {
            bookHandler.addEntry(entryOptionPane.getName(), entryOptionPane.getPhone());
            refreshList();
        }
    }

    /**
     * Edit the currently-selected item.
     */
    private void editItem() {
        int index = list.getSelectedIndex();
        if(index >= 0) {
            editItem(index);
        }
    }

    /**
     * Edit item at a given location in the list
     * @param index index of the item to edit. Must be a valid index.
     */
    private void editItem(int index) {
        DefaultListModel<Entry> defaultModel = getDefaultListModel();
        Entry entry = defaultModel.getElementAt(index);
        int result = entryOptionPane.showModalDialog(entry);
        if (result == JOptionPane.OK_OPTION) {
            bookHandler.removeEntry(entry.name());
            bookHandler.addEntry(entryOptionPane.getName(), entryOptionPane.getPhone());
            refreshList();
        }
    }

    /**
     * Delete the currently-selected item.
     */
    private void deleteItem() {
        int index = list.getSelectedIndex();
        if(index >= 0) {
            deleteItem(index);
        }
    }

    /**
     * Delete the in the list.
     * @param index index of item to delete within list. Must be a valid index.
     */
    private void deleteItem(int index) {
        DefaultListModel<Entry> defaultModel = getDefaultListModel();
        Entry entry = defaultModel.getElementAt(index);
        bookHandler.removeEntry(entry.name());
        refreshList();
    }

    /** Refresh the JList to match the contents of the model. */
    private void refreshList() {
        DefaultListModel<Entry> defaultModel = getDefaultListModel();
        defaultModel.clear();
        for(Entry entry: bookHandler.getPhoneBook()) {
            System.out.println("DEBUG: Displaying entry " + entry);
            defaultModel.insertElementAt(entry, defaultModel.size());
        }
        repaint();
        System.out.println("Debugging.");
    }

    /**
     * Get the internal list model
     * @return the DefaultListModel for the JList list.
     * @throws RuntimeException if the model is not a DefaultListModel. This should never
     *      happen, because we specify to use a DefaultListModel when constructing the JList list.
     */
    private DefaultListModel<Entry> getDefaultListModel() throws RuntimeException {
        ListModel<Entry> model = list.getModel();
        if(!(model instanceof DefaultListModel)) {
            throw new RuntimeException("This should never happen because we give a DefaultListModel to the list when we create it.");
        }
        return (DefaultListModel<Entry>)model;
    }
}