/**
 *	AddressBookGUI.java
 *
 *	Copyright (c) 2000, 2001, 2005 - Russell C. Bjork
 *
 */
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.IOException;
import java.util.Observer;
import java.util.Observable;

/**	An object of this class allows interaction between the program and the 
 *	human user.
 */
public class AddressBookGUI extends JFrame implements Observer
{
    /** Constructor
     *
     *	@param controller the controller which performs operations in
     *		   response to user gestures on this GUI
     *	@param addressBook the AddressBook this GUI displays
     */

    public AddressBookGUI(final AddressBookController controller,
    					  AddressBook addressBook)
    {
		this.controller = controller;
		
         // Create and add file menu
        
        JMenuBar menuBar = new JMenuBar();
        JMenu fileMenu = new JMenu("File");
        newItem = new JMenuItem("New", 'N');
        fileMenu.add(newItem);
        openItem = new JMenuItem("Open...", 'O');
        fileMenu.add(openItem);
        fileMenu.addSeparator();
        saveItem = new JMenuItem("Save", 'S');
        fileMenu.add(saveItem);
        saveAsItem = new JMenuItem("Save As...");
        fileMenu.add(saveAsItem);
        fileMenu.addSeparator();
        printItem = new JMenuItem("Print", 'P');
        fileMenu.add(printItem);
        fileMenu.addSeparator();
        quitItem = new JMenuItem("Quit", 'Q');
        fileMenu.add(quitItem);
        menuBar.add(fileMenu);
        setJMenuBar(menuBar);
        
		// The displayed list of names gets its information from the
		// address book
		
		nameListModel = new NameListModel();
				
		// The nameListModel and saveItem objects must exist before this is done;
		// but this must be done before the nameList is created
		
		setAddressBook(addressBook);	
		
       // Create and add components for the main window
        
        nameList = new JList(nameListModel);
        JScrollPane listPane = new JScrollPane(nameList);
        nameList.setVisibleRowCount(10);
        listPane.setBorder(BorderFactory.createCompoundBorder(
            BorderFactory.createEmptyBorder(10, 10, 10, 10), 
            BorderFactory.createLineBorder(Color.gray, 1)));
        getContentPane().add(listPane, BorderLayout.CENTER);
        JPanel buttonPanel = new JPanel();
        addButton = new JButton("     Add    ");
        buttonPanel.add(addButton);
        editButton = new JButton("    Edit    ");
        buttonPanel.add(editButton);
        deleteButton = new JButton("   Delete   ");
        buttonPanel.add(deleteButton);
        sortByNameButton = new JButton("Sort by name");
        buttonPanel.add(sortByNameButton);
        sortByZipButton = new JButton("Sort by ZIP ");
        buttonPanel.add(sortByZipButton);
        buttonPanel.setBorder(BorderFactory.createEmptyBorder(5, 10, 10, 10));
        
        getContentPane().add(buttonPanel, BorderLayout.SOUTH);
        
        // Add the action listeners for the buttons, menu items, and close box,
        // and for double-clicking the list
        
        addButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            {
            	controller.doAdd(AddressBookGUI.this);
            	int index = getAddressBook().getNumberOfPersons() - 1;
            	// This will ensure that the person just added is visible in list
            	nameList.ensureIndexIsVisible(index);
            }
        });
          
        editButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            {
				int index = nameList.getSelectedIndex();
				if (index < 0)
					reportError("You must select a person");
				else
					controller.doEdit(AddressBookGUI.this, index);
            }
        });
          
        deleteButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            { 
            	int index = nameList.getSelectedIndex();
 				if (index < 0)
					reportError("You must select a person");
				else
                 	controller.doDelete(AddressBookGUI.this, index);
            }
        });
        
        sortByNameButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            { 
            	controller.doSortByName(AddressBookGUI.this);
             }
        });
              
        sortByZipButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            { 
				controller.doSortByZip(AddressBookGUI.this);
            }
        });
        
        newItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            { 
				try
				{
					if (getAddressBook().getChangedSinceLastSave())
						controller.doOfferSaveChanges(AddressBookGUI.this);
				
					controller.doNew(AddressBookGUI.this);
				}
            	catch(IOException exception)
            	{
            		reportError("Problem writing the file: " +
            					 exception);
            	}
            	catch(InterruptedException exception)
            	{
            		// Thrown if user cancels a save or a file dialog - can be ignored
            	}
				catch(SecurityException exception)
				{
					// Thrown if security manager disallows the operation -
					// will always happen in an applet
					
					reportError("Operation disallowed: " + exception);
				}
            }
        });
            
        openItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            {
				try
				{
					if (getAddressBook().getChangedSinceLastSave())
						controller.doOfferSaveChanges(AddressBookGUI.this);
				
            		controller.doOpen(AddressBookGUI.this);
            	}
            	catch(IOException exception)
            	{
            		reportError("Problem reading or writing the file: " +
            					 exception);
            	}
            	catch(InterruptedException exception)
            	{
            		// Thrown if user cancels a save or a file dialog - can be ignored
            	}
				catch(SecurityException exception)
				{
					// Thrown if security manager disallows the operation -
					// will always happen in an applet
					
					reportError("Operation disallowed: " + exception);
				}
            	catch(Exception exception)
            	{
            		// Any other case means the file did not contain an
            		// address book

            		reportError("This file did not contain an address book");
            	}	
            }
        });
            
       saveItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            { 
            	try
            	{
            		controller.doSave(AddressBookGUI.this);
            	}
             	catch(IOException exception)
            	{
            		reportError("Problem writing the file: " +
            					 exception);
            	} 
            	catch(InterruptedException exception)
            	{
            		// Thrown if user cancels a file dialog - can be ignored
            	}
				catch(SecurityException exception)
				{
					// Thrown if security manager disallows the operation -
					// will always happen in an applet
					
					reportError("Operation disallowed: " + exception);
				}
            }
        });
            
        saveAsItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            { 
            	try
            	{
            		controller.doSaveAs(AddressBookGUI.this);
            	}
             	catch(IOException exception)
            	{
            		reportError("Problem writing the file: " +
            					 exception);
            	} 
            	catch(InterruptedException exception)
            	{
            		// Thrown if user cancels a file dialog - can be ignored
            	}
				catch(SecurityException exception)
				{
					// Thrown if security manager disallows the operation -
					// will always happen in an applet
					
					reportError("Operation disallowed: " + exception);
				}
            }
        });
            
        printItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            { 
				controller.doPrint(AddressBookGUI.this);
			}
        });
            
        quitItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            { 
				AddressBookApplication.quitApplication();
			}
        });
            
		setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e)
            { 
				try
				{
					if (getAddressBook().getChangedSinceLastSave())
						controller.doOfferSaveChanges(AddressBookGUI.this);

					dispose();
					
					if (Frame.getFrames().length == 0)
						AddressBookApplication.quitApplication();
				}
             	catch(IOException exception)
            	{
            		reportError("Problem writing the file: " +
            					 exception);
            	} 
            	catch(InterruptedException exception)
            	{
            		// Thrown if user cancels a file dialog - can be ignored
            	}
				catch(SecurityException exception)
				{
					// Thrown if security manager disallows the operation -
					// will always happen in an applet
					
					reportError("Operation disallowed: " + exception);
				}
				
            }
        });
        
 		// The following is adapted from an example in the documentation
 		// for class JList.  It invokes the controller's doEdit method
 		// if the user double clicks a name.
 		
		nameList.addMouseListener(new MouseAdapter() {
			public void mouseClicked(MouseEvent e) 
			{
				if (e.getClickCount() == 2) 
				{
					int index = nameList.locationToIndex(e.getPoint());
					controller.doEdit(AddressBookGUI.this, index);
				}
			}
 		});
 		
 		pack();     
    }
    
	/** Accessor for the address book this GUI displays
	 *
	 *	@return the current address book for this GUI
	 */
	public AddressBook getAddressBook()
	{
		return addressBook;
	}
	
	/** Mutator to change the address book this GUI displays
	 *
	 *	@param addressBook the new address book for this GUI
	 */
	public void setAddressBook(AddressBook addressBook)
	{
		if (this.addressBook != null)
			this.addressBook.deleteObserver(this);
			
		this.addressBook = addressBook;
		addressBook.addObserver(this);
		update(addressBook, null);
	}
	
    /** Report an error to the user
     *
     *  @param message the message to display
     */
    public void reportError(String message)
    {
        JOptionPane.showMessageDialog(this, message, "Error message",
                                      JOptionPane.ERROR_MESSAGE);
    }
    
	/** Method required by the Observer interface - update the display
	 *	in response to any change in the address book
	 */
	public void update(Observable o, Object arg)
	{
		if (o == addressBook)
		{
			setTitle(addressBook.getTitle());
			saveItem.setEnabled(addressBook.getChangedSinceLastSave());
			nameListModel.contentsChanged();
		}
	}
			
    // GUI components and menu items
    
	private NameListModel nameListModel;
    private JList nameList;
    private JButton addButton, editButton, deleteButton, sortByNameButton, sortByZipButton;
    private JMenuItem newItem, openItem, saveItem, saveAsItem, printItem, quitItem;
    
	// The controller that performs operations in response to user gestures
	
	private AddressBookController controller;
	
	// The address book this GUI displays / operates on
	
	private AddressBook addressBook;
	
	/** Class used for the model for the list of persons in the address book
	 */
	private class NameListModel extends AbstractListModel
	{
		/** Report that the contents of the list have changed
		 */
		void contentsChanged()
		{
			super.fireContentsChanged(this, 0, 0);
		}
		
		// Implementation of abstract methods of the base class
		
		public Object getElementAt(int index)
		{
			return getAddressBook().getFullNameOfPerson(index);
		}

		public int getSize()
		{
			return getAddressBook().getNumberOfPersons();
		}
	}
}