/**
 *  Copyright (C) 2007 by Mar'yan Rachynskyy
 *  mrach@users.sourceforge.net
 *  
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.sf.linuxorg.pcal;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.IOException;
import java.text.DateFormat;
import java.text.DateFormatSymbols;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TreeSet;
import java.util.Vector;
import java.util.prefs.Preferences;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.DefaultListModel;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JEditorPane;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JPopupMenu;
import javax.swing.JRootPane;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.JToolBar;
import javax.swing.KeyStroke;
import javax.swing.ListSelectionModel;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingConstants;
import javax.swing.Timer;
import javax.swing.WindowConstants;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;
import javax.xml.parsers.ParserConfigurationException;

import org.xml.sax.SAXException;

import net.sf.linuxorg.pcal.bbtgui.PCaBBTDialog;
import net.sf.linuxorg.pcal.engine.Engine;
import net.sf.linuxorg.pcal.engine.Engine.PasswordRequiredException;
import net.sf.linuxorg.pcal.messages.Messages;

/**
 * @author Mar'yan Rachynskyy
 *
 */
public class MainWindow {

	private static final String PCAL_EXT = "pcal"; //$NON-NLS-1$
	private static final String PCAL_ENC_EXT = "pcalc"; //$NON-NLS-1$

	public final Color DEFAULT_UNDEFINED_MONTH_BG_COLOR = new Color(0xFFFFFF);
	public final Color DEFAULT_UNDEFINED_MONTH_FG_COLOR = new Color(0x000000);
	public final Color DEFAULT_INACTIVE_MONTH_BG_COLOR = new Color(0xE5E5E5);
	public final Color DEFAULT_INACTIVE_MONTH_FG_COLOR = new Color(0xBFBFBF);
	public final Color DEFAULT_DAY1_BG_COLOR = new Color(0xB85252);
	public final Color DEFAULT_DAY1_FG_COLOR = new Color(0xFFFF00);
	public final Color DEFAULT_PDAY1_BG_COLOR = new Color(0xE01F1F);
	public final Color DEFAULT_PDAY1_FG_COLOR = new Color(0xFFFF00);
	public final Color DEFAULT_FERT_BG_COLOR = new Color(0x52B852);
	public final Color DEFAULT_FERT_FG_COLOR = new Color(0xFFFF00);
	public final Color DEFAULT_PFERT_BG_COLOR = new Color(0x1FE01F);
	public final Color DEFAULT_PFERT_FG_COLOR = new Color(0xFFFF00);
	public final Color DEFAULT_OVUL_BG_COLOR = new Color(0xD5ED4D);
	public final Color DEFAULT_OVUL_FG_COLOR = new Color(0x000000);
	public final Color DEFAULT_PREG_BG_COLOR = new Color(0xB1C4E9);
	public final Color DEFAULT_PREG_FG_COLOR = new Color(0x000000);
	public final Color DEFAULT_BIRTH_BG_COLOR = new Color(0x97189E);
	public final Color DEFAULT_BIRTH_FG_COLOR = new Color(0xFFFF00);
	public final Color DEFAULT_PBIRTH_BG_COLOR = new Color(0xDD0FEA);
	public final Color DEFAULT_PBIRTH_FG_COLOR = new Color(0xFFFF00);


	private JFrame frame;

	// master current date storage
	private Date calCurrentDate = null;

	// the current calendar starting date
	private Date calCurrentStartDate = null;

	// the currently selected note date
	private Date calCurrentNoteDate = null;

	private Action actionNew,
	actionOpen,
	actionImport,
	actionExport,
	actionPreferences,
	actionExit,
	actionNextMonth,
	actionPrevMonth,
	actionNextYear,
	actiomPrevYear,
	actionToday,
	actionAddMenstruation,
	actionAddOvulation,
	actionRecordPregnancy,
	actionRecordPregInt,
	actionRecordBirth,
	actionDeleteRecord,
	actionShowBBTDialog,
	actionShowStatistics,
	actionAddNote,
	actionRemoveNote,
	actionContent,
	actionAbout,
	actionLicense;

	//these two actions extend core functionality
	private ActionSave actionSave;
	private ActionSaveAs actionSaveAs;	

	// main panel components

	// the week day names taken from locale
	private String[] dayNames;
	//the month names taken from the localization file
	public static final String[] monthNames = {Messages.getString("MainWindow.202"), Messages.getString("MainWindow.203"), Messages.getString("MainWindow.204"), Messages.getString("MainWindow.205"), Messages.getString("MainWindow.206"), Messages.getString("MainWindow.207"), Messages.getString("MainWindow.208"), Messages.getString("MainWindow.209"), Messages.getString("MainWindow.210"), Messages.getString("MainWindow.211"), Messages.getString("MainWindow.212"), Messages.getString("MainWindow.213")}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ //$NON-NLS-6$ //$NON-NLS-7$ //$NON-NLS-8$ //$NON-NLS-9$ //$NON-NLS-10$ //$NON-NLS-11$ //$NON-NLS-12$

	//This structure represents the simple to process information for the calendar cell renderer
	private class DayRenderInfo {
		public DayRenderInfo(final String label, 
				final Color FGColor, final Color BGColor, boolean showIcon) {
			this.label = label;
			this.FGColor = FGColor;
			this.BGColor = BGColor;
			this.showIcon = showIcon;
		}
		public String label;
		public Color FGColor;
		public Color BGColor;
		public boolean showIcon; // Show notes availability icon
		@Override
		public String toString() {
			return label;
		}
	}

	// month day number being displayed in the calendar i.e. (29, 30, 1, 2, ...)
	// this array cover the current month only 
	private Vector<DayRenderInfo> calendarDays = new Vector<DayRenderInfo>(); 

	private JTable calendarTable = null;
	private JPopupMenu calendarPopupMenu = null;
	private boolean jumping = false; //true during selection change in jumpToDate
	private int target_day_pos = 0;
	private JScrollPane calendarScrollPane;
	private final JLabel legendLabels[] = {new JLabel(Messages.getString("MainWindow.0")), //$NON-NLS-1$
			new JLabel(Messages.getString("MainWindow.1")), //$NON-NLS-1$
			new JLabel(Messages.getString("MainWindow.2")), //$NON-NLS-1$
			new JLabel(Messages.getString("MainWindow.3")), //$NON-NLS-1$
			new JLabel(Messages.getString("MainWindow.4")), //$NON-NLS-1$
			new JLabel(Messages.getString("MainWindow.5")), //$NON-NLS-1$
			new JLabel(Messages.getString("MainWindow.6")), //$NON-NLS-1$
			new JLabel(Messages.getString("MainWindow.13"))}; //$NON-NLS-1$
	public final Color defaultFGColors[] = { 
			DEFAULT_DAY1_FG_COLOR,
			DEFAULT_PDAY1_FG_COLOR,
			DEFAULT_FERT_FG_COLOR,
			DEFAULT_PFERT_FG_COLOR,
			DEFAULT_PREG_FG_COLOR,
			DEFAULT_BIRTH_FG_COLOR,
			DEFAULT_PBIRTH_FG_COLOR,
			DEFAULT_OVUL_FG_COLOR};
	public final Color defaultBGColors[] = {
			DEFAULT_DAY1_BG_COLOR,
			DEFAULT_PDAY1_BG_COLOR,
			DEFAULT_FERT_BG_COLOR,
			DEFAULT_PFERT_BG_COLOR,
			DEFAULT_PREG_BG_COLOR,
			DEFAULT_BIRTH_BG_COLOR,
			DEFAULT_PBIRTH_BG_COLOR,
			DEFAULT_OVUL_BG_COLOR};

	public Color[] legendFGColors = new Color[8];
	public Color[] legendBGColors = new Color[8];

	// these are constants for looking up the day colors in the corresponding arrays
	private final int IDX_DAY1 = 0;
	private final int IDX_P_DAY1 = 1;
	private final int IDX_FERT = 2;
	private final int IDX_P_FERT = 3;
	private final int IDX_PREG = 4;
	private final int IDX_BIRTH = 5;
	private final int IDX_P_BIRTH = 6;
	private final int IDX_OVUL = 7;


	// toolbar components
	private JLabel toolbarMonthLabel;
	private JLabel toolbarYearLabel;

	// right panel components
	private JLabel dayInfoLabelDate = new JLabel(""); //$NON-NLS-1$
	private JLabel dayInfoLabels[] = {
			new JLabel(""), //$NON-NLS-1$
			new JLabel(""), //$NON-NLS-1$
			new JLabel(""), //$NON-NLS-1$
			new JLabel(""), //$NON-NLS-1$
			new JLabel(""), //$NON-NLS-1$
			new JLabel("") //$NON-NLS-1$
	};
	private JLabel predictionLabel = new JLabel(""); //$NON-NLS-1$

	//bottom panel components
	private DefaultListModel notesListModel;
	private JList notesDatesList;
	private JTextArea notesTextArea;
	private JSplitPane notesSplitPane;

	// status bar components
	JLabel timerStatusBar = null;
	JLabel statisticsStatusBar = null;

	// the BBT dialog
	PCaBBTDialog bbtDialog = null;

	// the statistics dialog
	PCalStatisticsDialog statisticsDialog = null;

	// the preferences dialog
	PCalPrefDialog prefsDialog = null;

	// Help Window
	PCalHelpWindow helpDialog = null;

	/**
	 * Constructor creates the main window and show it immediately
	 *
	 */
	public MainWindow() {
		//Schedule a job for the event-dispatching thread:
		//creating and showing this application's GUI.
		javax.swing.SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				createAndShowGUI(PCalendar.preloadFile);
			}
		});
	}

	/**
	 * Create the GUI and show it.  For thread safety,
	 * this method should be invoked from the
	 * event-dispatching thread.
	 */
	private void createAndShowGUI(String preloadFile) {
		initializeActions();		

		//Create and set up the window.
		frame = new JFrame(Messages.getString("MainWindow.15")); //$NON-NLS-1$
		frame.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
		//Border layout is needed to make toolbar draggable
		frame.setLayout(new BorderLayout());		

		//set the frame image
		ImageIcon ii = createResoruceIcon("pcalendar.png"); //$NON-NLS-1$
		if(ii!=null) {
			frame.setIconImage(ii.getImage());
		}

		// Get the locale-specific values
		Locale locale = Locale.getDefault();
		DateFormatSymbols dateFormatSymbols = new DateFormatSymbols(locale);
		Calendar calendar = java.util.Calendar.getInstance(locale);
		int firstDayOfWeek = calendar.getFirstDayOfWeek();

		// get the locale day of week names
		String[] originalDayNames =  dateFormatSymbols.getShortWeekdays();
		dayNames = new String[originalDayNames.length-1];
		System.arraycopy(
				originalDayNames, firstDayOfWeek, 
				dayNames, 0, dayNames.length-(firstDayOfWeek-1));
		if ( firstDayOfWeek != 1 )
		{
			System.arraycopy(
					originalDayNames, 1,
					dayNames, dayNames.length-(firstDayOfWeek-1), firstDayOfWeek-1);
		}

		createMainPanel();

		buildMenuAndToolbar();

		frame.addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent we) {
				actionExit.actionPerformed(null);
			}		
		});

		//initiate the timer
		new Timer(5000, new ActionListener() {
			public void actionPerformed(ActionEvent evt) {
				timerStatusBar.setText(DateFormat.getDateTimeInstance(DateFormat.LONG,DateFormat.SHORT).format(new Date()));
			}
		}).start();

		//Refresh (actually initialize everything)
		refreshLegend();
		Preferences windowPrefsNode = PCalendar.settings.node("MainWindow"); //$NON-NLS-1$
		if(preloadFile.isEmpty()) {
			// check if the default file to load
			preloadFile = windowPrefsNode.get("AutoLoadFile", ""); //$NON-NLS-1$ //$NON-NLS-2$
		}		
		if(!preloadFile.isEmpty()) {
			loadFileHandler(new File(preloadFile));
		}

		updateWindowTitle();		

		jumpToDate(null, true);
		refreshNotes();
		refreshStatistics();

		//Display the window.
		frame.pack();
		resizeComponents();
		readSettings();
		frame.setVisible(true);

		if(windowPrefsNode.get("ShowDisclaimer", "Yes").equals("Yes")) { //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
			showDisclaimer();
			windowPrefsNode.put("ShowDisclaimer", "No"); //$NON-NLS-1$ //$NON-NLS-2$
		}
	}

	private void showDisclaimer() {
		JOptionPane.showMessageDialog(frame,
				Messages.getString("MainWindow.7"), //$NON-NLS-1$
				Messages.getString("MainWindow.8"), //$NON-NLS-1$
				JOptionPane.WARNING_MESSAGE);
	}

	private void createMainPanel() {
		// define the sub-panels
		JPanel masterPanel = new JPanel(new GridBagLayout());
		JPanel leftPanel = new JPanel(new GridBagLayout());
		leftPanel.setBorder(BorderFactory.createCompoundBorder(
				BorderFactory.createTitledBorder(Messages.getString("MainWindow.16")), //$NON-NLS-1$
				BorderFactory.createEmptyBorder(2,2,2,2)));
		JPanel rightPanel = new JPanel(new GridBagLayout());
		rightPanel.setBorder(BorderFactory.createCompoundBorder(
				BorderFactory.createTitledBorder(Messages.getString("MainWindow.17")), //$NON-NLS-1$
				BorderFactory.createEmptyBorder(2,2,2,2)));
		JPanel bottomPanel = new JPanel(new BorderLayout());
		bottomPanel.setBorder(BorderFactory.createCompoundBorder(
				BorderFactory.createTitledBorder(Messages.getString("MainWindow.18")), //$NON-NLS-1$
				BorderFactory.createEmptyBorder(2,2,2,2)));

		// Creating Calendar frame
		calendarTable = new JTable(new AbstractTableModel() {
			private static final long serialVersionUID = 0L;
			@Override
			public String getColumnName(int col) {
				return dayNames[col].toString();
			}
			public int getRowCount() {
				return calendarDays.size()==0?0:(calendarDays.size()/7); 
			}
			public int getColumnCount() { return 7; }
			public Object getValueAt(int row, int col) {
				int offset = row*7+col;
				return (calendarDays.size()<=offset)?"":calendarDays.get(offset);  //$NON-NLS-1$
			}
			@Override
			public boolean isCellEditable(int row, int col) {return false;}
			@Override
			public void setValueAt(Object value, int row, int col) {
				fireTableCellUpdated(row, col);
			}
			@Override
			public Class<?> getColumnClass(int c) {
				return DayRenderInfo.class;
			}
		});

		calendarTable.setDefaultRenderer(DayRenderInfo.class, new TableCellRenderer() {
			public Component getTableCellRendererComponent(JTable table, Object value,
					boolean isSelected, boolean hasFocus,
					int row, int column) {
				if(! (value instanceof DayRenderInfo)) return null;
				DayRenderInfo dinfo = (DayRenderInfo)value;
				JLabel label;
				if(dinfo.showIcon) {
					label = new JLabel(dinfo.label, 
							createResoruceIcon("12x12/stock_attach.png"),   //$NON-NLS-1$
							SwingConstants.TRAILING);
				} else {
					label = new JLabel(dinfo.label, SwingConstants.TRAILING);
				}
				label.setOpaque(true);
				if(isSelected) {
					label.setBorder(BorderFactory.createMatteBorder(1,1,1,1,
							dinfo.FGColor));
				}
				label.setBackground(dinfo.BGColor);
				label.setForeground(dinfo.FGColor);
				return label;
			}
		});		

		calendarTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		calendarTable.setRowSelectionAllowed(false);
		calendarTable.setCellSelectionEnabled(true);
		ListSelectionListener listener = new ListSelectionListener() {
			public void valueChanged(ListSelectionEvent e) {
				//Ignore extra messages.
				if (e.getValueIsAdjusting()) return;
				if (jumping) return;
				int srow = calendarTable.getSelectedRow();
				int scol = calendarTable.getSelectedColumn(); 
				if ((srow < 0) || (scol < 0)) return;
				int selection_pos = srow * 7 + scol;

				Calendar calendar = new GregorianCalendar();
				calendar.setTime(calCurrentStartDate);
				calendar.add(Calendar.DATE, selection_pos);
				jumpToDate(calendar.getTime(), false);
			}
		}; 
		calendarTable.getSelectionModel().addListSelectionListener(listener);
		calendarTable.getColumnModel().getSelectionModel().addListSelectionListener(listener);
		calendarTable.getTableHeader().setResizingAllowed(false);
		calendarTable.getTableHeader().setReorderingAllowed(false);


		// set up the calendar popup menu
		calendarPopupMenu = new JPopupMenu();
		calendarPopupMenu.add(actionAddMenstruation);
		calendarPopupMenu.add(actionAddOvulation);
		calendarPopupMenu.addSeparator();
		calendarPopupMenu.add(actionRecordPregnancy);
		calendarPopupMenu.add(actionRecordBirth);
		calendarPopupMenu.add(actionRecordPregInt);
		calendarPopupMenu.addSeparator();
		calendarPopupMenu.add(actionDeleteRecord);

		calendarTable.addKeyListener(new KeyListener() {
			public void keyPressed(KeyEvent e) {
				int delta = 0;
				switch(e.getKeyCode()) {
				case KeyEvent.VK_LEFT: delta = -1; break;
				case KeyEvent.VK_KP_LEFT: delta = -1; break;
				case KeyEvent.VK_RIGHT: delta = 1; break;
				case KeyEvent.VK_KP_RIGHT: delta = 1; break;
				case KeyEvent.VK_UP: delta = -7; break;
				case KeyEvent.VK_KP_UP: delta = -7; break;
				case KeyEvent.VK_DOWN: delta = 7; break;
				case KeyEvent.VK_KP_DOWN: delta = 7; break;
				case KeyEvent.VK_PAGE_UP: delta = -30; break;
				case KeyEvent.VK_PAGE_DOWN: delta = 30; break;
				default: return;
				}
				Calendar calendar = new GregorianCalendar();
				calendar.setTime(calCurrentDate);

				if(delta == -30) {
					calendar.add(Calendar.MONTH, -1);
				} else
					if(delta == 30) {
						calendar.add(Calendar.MONTH, 1);
					} else {
						calendar.add(Calendar.DATE, delta);
					}

				jumpToDate(calendar.getTime(), true);
				e.consume();
			}
			public void keyReleased(KeyEvent e) {
				// no need to change anything				
			}
			public void keyTyped(KeyEvent e) {
				// no need to change anything
			}
		});


		calendarTable.addMouseListener( new MouseAdapter() {
			@Override
			public void mousePressed(MouseEvent e) {
				maybeShowPopup(e);
			}

			@Override
			public void mouseReleased(MouseEvent e) {
				maybeShowPopup(e);
			}

			private void maybeShowPopup(MouseEvent e) {
				if (e.isPopupTrigger()) {
					int row = calendarTable.rowAtPoint(e.getPoint());
					int col = calendarTable.columnAtPoint(e.getPoint());

					Calendar calendar = new GregorianCalendar();
					calendar.setTime(calCurrentStartDate);
					calendar.add(Calendar.DATE, row * 7 + col);

					jumpToDate(calendar.getTime(),false);
					calendarPopupMenu.show(e.getComponent(),
							e.getX(), e.getY());
				}
			}
		}
				);

		calendarScrollPane = new JScrollPane(calendarTable);
		GridBagConstraints c = new GridBagConstraints();
		c.gridheight = 5;
		leftPanel.add(calendarScrollPane, c);

		Preferences windowPrefsNode = PCalendar.settings.node("MainWindow"); //$NON-NLS-1$
		// setup the legend components
		for(int i=0; i<legendLabels.length; i++) {
			legendLabels[i].setOpaque(true);
			legendLabels[i].setHorizontalAlignment(SwingConstants.CENTER);
			c = new GridBagConstraints();
			switch(i) {
			case 0:
			case 1: c.gridy = 1; break;
			case 2:
			case 3: c.gridy = 2; break;
			case 7:
			case 4: c.gridy = 3; break;
			case 5:
			case 6: c.gridy = 4;			 
			}
			c.gridx = ((i==1)||(i==3)||(i==6)||(i==7))?2:1;

			c.fill = GridBagConstraints.HORIZONTAL;
			c.anchor = GridBagConstraints.NORTHWEST;
			c.insets.right = 5;
			c.insets.bottom = 5;
			leftPanel.add(legendLabels[i], c);
			Color fgColor = new Color(windowPrefsNode.getInt("FGColor"+i, defaultFGColors[i].getRGB())); //$NON-NLS-1$
			Color bgColor = new Color(windowPrefsNode.getInt("BGColor"+i, defaultBGColors[i].getRGB())); //$NON-NLS-1$
			legendLabels[i].setForeground(fgColor);
			legendLabels[i].setBackground(bgColor);
			legendFGColors[i] = fgColor;
			legendBGColors[i] = bgColor;
		}
		// enforce top left corner
		c = new GridBagConstraints();
		c.gridx = 10;
		c.gridy = 10;
		c.weightx = 1.0;
		c.weighty = 1.0;
		leftPanel.add(new JLabel(""),c);  //$NON-NLS-1$

		// Create right panel
		JLabel label = new JLabel(Messages.getString("MainWindow.22")); //$NON-NLS-1$
		c = new GridBagConstraints();
		c.anchor = GridBagConstraints.WEST;
		//force left fill
		c.fill = GridBagConstraints.HORIZONTAL;
		c.insets.right = 5;
		rightPanel.add(label, c);
		c = new GridBagConstraints();
		c.gridx = 1;
		c.anchor = GridBagConstraints.WEST;
		c.weightx = 1.0;
		c.insets.right = 5;
		rightPanel.add(dayInfoLabelDate, c);		

		for(int i=0;i<dayInfoLabels.length; i++) {
			c = new GridBagConstraints();
			c.gridx = i%2;
			c.gridy = i/2+1;
			c.anchor = GridBagConstraints.WEST;
			c.insets.right = 5;
			c.fill = GridBagConstraints.HORIZONTAL;
			rightPanel.add(dayInfoLabels[i], c);			
		}

		c = new GridBagConstraints();
		c.gridy = 4;
		c.anchor = GridBagConstraints.NORTHWEST;
		c.weighty = 1.0;
		c.gridwidth = 2;
		rightPanel.add(predictionLabel, c);

		// create bottom panel
		JToolBar buttonsPanel =  new JToolBar();
		buttonsPanel.setOrientation(SwingConstants.VERTICAL);
		buttonsPanel.setFloatable(false);
		buttonsPanel.add(actionAddNote);
		buttonsPanel.addSeparator();
		buttonsPanel.add(actionRemoveNote);

		notesTextArea = new JTextArea();
		notesTextArea.setEnabled(false);
		JScrollPane notesScrollPane = new JScrollPane(notesTextArea);
		notesScrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
		notesScrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);

		notesListModel = new DefaultListModel() {
			private static final long serialVersionUID = -3900047130891716805L;

			@Override
			public Object getElementAt(int index) {
				DateFormat dateFormatter = DateFormat.getDateInstance(DateFormat.SHORT);
				return dateFormatter.format(get(index));
			}
		};
		notesDatesList = new JList(notesListModel);
		notesDatesList.addListSelectionListener(new ListSelectionListener(){
			public void valueChanged(ListSelectionEvent e) {
				if(e.getValueIsAdjusting()) return;
				int selectedIndex = notesDatesList.getSelectedIndex();
				if(selectedIndex>-1) {
					jumpToDate((Date) notesListModel.get(selectedIndex), false);
				}
			}
		});
		JScrollPane datesListScrollPane = new JScrollPane(notesDatesList);
		datesListScrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		notesSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
				datesListScrollPane, notesScrollPane);
		notesSplitPane.setOneTouchExpandable(true);
		notesSplitPane.setDividerLocation(150);

		Dimension minimumSize = new Dimension(100, 50);
		notesDatesList.setMinimumSize(minimumSize);
		notesTextArea.setMinimumSize(minimumSize);

		bottomPanel.add(buttonsPanel, BorderLayout.LINE_START);
		bottomPanel.add(notesSplitPane, BorderLayout.CENTER);


		// create status bar
		JPanel statusBar =  new JPanel(new BorderLayout());
		statisticsStatusBar = new JLabel();
		statisticsStatusBar.setBorder(BorderFactory.createLoweredBevelBorder());
		statusBar.add(statisticsStatusBar, BorderLayout.CENTER);
		timerStatusBar = new JLabel();        
		timerStatusBar.setBorder(BorderFactory.createLoweredBevelBorder());
		timerStatusBar.setText(DateFormat.getDateTimeInstance(DateFormat.LONG,DateFormat.SHORT).format(new Date()));
		statusBar.add(timerStatusBar, BorderLayout.LINE_END);

		// lay out panels
		c = new GridBagConstraints();
		c.fill = GridBagConstraints.BOTH;
		masterPanel.add(leftPanel, c);
		c = new GridBagConstraints();
		c.gridx = 1;
		c.weightx = 1.0;
		c.fill = GridBagConstraints.BOTH;
		masterPanel.add(rightPanel, c);
		c = new GridBagConstraints();
		c.gridy = 1;
		c.weighty = 1.0;
		c.gridwidth = 2;
		c.fill = GridBagConstraints.BOTH;
		masterPanel.add(bottomPanel, c);
		frame.add(masterPanel, BorderLayout.CENTER);
		frame.add(statusBar, BorderLayout.PAGE_END);
	}

	/** Returns an ImageIcon, or null if the path was invalid. */
	public static ImageIcon createResoruceIcon(String imageName) {
		java.net.URL imageURL = MainWindow.class.getResource("images/"+imageName); //$NON-NLS-1$
		if (imageURL == null) {
			return null;
		} else {
			return new ImageIcon(imageURL);
		}
	}

	/**
	 * Create all global actions.
	 */
	private void initializeActions() {
		actionNew = new ActionNew(); 
		actionOpen = new ActionOpen(); 
		actionSave = new ActionSave(); 
		actionSaveAs = new ActionSaveAs();
		actionImport = new ActionImport();
		actionExport = new ActionExport();
		actionPreferences = new ActionPreferences();
		actionExit = new ActionExit(); 
		actionNextMonth = new ActionNextMonth();
		actionPrevMonth = new ActionPrevMonth();
		actionNextYear = new ActionNextYear();
		actiomPrevYear = new ActiomPrevYear();
		actionToday = new ActionToday();
		actionAddMenstruation = new ActionAddMenstruation();
		actionAddOvulation = new ActionAddOvulation();
		actionRecordPregnancy = new ActionRecordPregnancy();
		actionRecordPregInt = new ActionRecordPregInt();
		actionRecordBirth = new ActionRecordBirth();
		actionDeleteRecord = new ActionDeleteRecord();
		actionShowBBTDialog = new ActionShowBBTDialog();
		actionShowStatistics = new ActionShowStatistics();
		actionAddNote = new ActionAddNote();
		actionRemoveNote = new ActionRemoveNote();
		actionContent = new ActionContent(); 
		actionAbout = new ActionAbout();		 
		actionLicense = new ActionLicense();
	}

	private void buildMenuAndToolbar() {
		JMenuBar mainMenuBar = new JMenuBar();
		JMenu menu = new JMenu(Messages.getString("MainWindow.23")); //$NON-NLS-1$		
		menu.setMnemonic(Messages.getMnemonic("MainWindow.23.Mnemonic")); //$NON-NLS-1$
		menu.getAccessibleContext().setAccessibleDescription(Messages.getString("MainWindow.24")); //$NON-NLS-1$

		JMenuItem menuItem = new JMenuItem(actionNew);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionOpen);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionSave);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionSaveAs);
		menu.add(menuItem);
		menu.addSeparator();
		menuItem = new JMenuItem(actionImport);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionExport);
		menu.add(menuItem);
		menu.addSeparator();
		menuItem = new JMenuItem(actionPreferences);
		menu.add(menuItem);
		menu.addSeparator();
		menuItem = new JMenuItem(actionExit);
		menu.add(menuItem);

		mainMenuBar.add(menu);

		menu = new JMenu(Messages.getString("MainWindow.25")); //$NON-NLS-1$		
		menu.setMnemonic(Messages.getMnemonic("MainWindow.25.Mnemonic")); //$NON-NLS-1$
		menu.getAccessibleContext().setAccessibleDescription(Messages.getString("MainWindow.26")); //$NON-NLS-1$
		menuItem = new JMenuItem(actionAddMenstruation);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionAddOvulation);
		menu.add(menuItem);
		menu.addSeparator();
		menuItem = new JMenuItem(actionRecordPregnancy);
		menu.add(menuItem);		
		menuItem = new JMenuItem(actionRecordBirth);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionRecordPregInt);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionDeleteRecord);
		menu.add(menuItem);
		menu.addSeparator();

		menuItem = new JMenuItem(actionShowBBTDialog);
		menu.add(menuItem);
		menu.addSeparator();

		menuItem = new JMenuItem(actionShowStatistics);
		menu.add(menuItem);
		mainMenuBar.add(menu);

		menu = new JMenu(Messages.getString("MainWindow.27")); //$NON-NLS-1$
		menu.setMnemonic(Messages.getMnemonic("MainWindow.27.Mnemonic")); //$NON-NLS-1$
		menu.getAccessibleContext().setAccessibleDescription(Messages.getString("MainWindow.28")); //$NON-NLS-1$
		menuItem = new JMenuItem(actionAddNote);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionRemoveNote);
		menu.add(menuItem);
		mainMenuBar.add(menu);

		menu = new JMenu(Messages.getString("MainWindow.29")); //$NON-NLS-1$
		menu.setMnemonic(Messages.getMnemonic("MainWindow.29.Mnemonic")); //$NON-NLS-1$
		menu.getAccessibleContext().setAccessibleDescription(
				Messages.getString("MainWindow.30")); //$NON-NLS-1$
		menuItem = new JMenuItem(actionToday);
		menu.add(menuItem);
		menu.addSeparator();
		menuItem = new JMenuItem(actionNextMonth);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionPrevMonth);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionNextYear);
		menu.add(menuItem);
		menuItem = new JMenuItem(actiomPrevYear);
		menu.add(menuItem);
		mainMenuBar.add(menu);

		// Help
		menu = new JMenu(Messages.getString("MainWindow.31")); //$NON-NLS-1$
		menu.setMnemonic(Messages.getMnemonic("MainWindow.31.Mnemonic")); //$NON-NLS-1$
		menu.getAccessibleContext().setAccessibleDescription(
				Messages.getString("MainWindow.32")); //$NON-NLS-1$
		menuItem = new JMenuItem(actionContent);
		menu.add(menuItem);
		menuItem = new JMenuItem(actionLicense);
		menu.add(menuItem);
		menu.addSeparator();
		menuItem = new JMenuItem(actionAbout);
		menu.add(menuItem);

		mainMenuBar.add(menu);

		frame.setJMenuBar(mainMenuBar);

		// ----------------------

		JToolBar toolBar = new JToolBar(Messages.getString("MainWindow.33")); //$NON-NLS-1$
		toolBar.add(actionNew);
		toolBar.add(actionOpen);
		toolBar.add(actionSave);
		toolBar.add(actionExit);
		toolBar.addSeparator();
		toolBar.add(actionPrevMonth);
		toolBar.add(Box.createRigidArea(new Dimension(5, 0)));

		toolbarMonthLabel = new JLabel("", SwingConstants.CENTER);  //$NON-NLS-1$
		toolBar.add(toolbarMonthLabel);

		toolBar.add(Box.createRigidArea(new Dimension(5, 0)));
		toolBar.add(actionNextMonth);
		toolBar.addSeparator();
		toolBar.add(actiomPrevYear);
		toolBar.add(Box.createRigidArea(new Dimension(5, 0)));
		toolbarYearLabel = new JLabel("", SwingConstants.CENTER);  //$NON-NLS-1$
		toolBar.add(toolbarYearLabel);
		toolBar.add(Box.createRigidArea(new Dimension(5, 0)));
		toolBar.add(actionNextYear);
		toolBar.addSeparator();
		toolBar.add(actionToday);
		toolBar.addSeparator();
		toolBar.add(actionShowBBTDialog);		

		frame.add(toolBar, BorderLayout.PAGE_START);
	}

	/**
	 * Set the preferred sizes for the components to fit the content well
	 */
	private void resizeComponents() {
		//resize the main window components
		Dimension calendarDimension = new Dimension(250, 
				(calendarTable.getRowHeight()+calendarTable.getRowMargin())*7);
		calendarTable.setPreferredScrollableViewportSize(calendarDimension);
		calendarScrollPane.setMinimumSize(new Dimension (calendarDimension));

		// resize the toolbar components
		// calculate the longest month name width
		int max_month_width = 0;
		FontMetrics fm = toolbarMonthLabel.getGraphics().getFontMetrics();

		for(String monthName : monthNames) {
			int iwidth = fm.stringWidth(monthName);
			if(max_month_width<iwidth) {
				max_month_width = iwidth;
			}
		}
		Dimension dimensiom = new Dimension(max_month_width+10,toolbarMonthLabel.getHeight());
		toolbarMonthLabel.setMaximumSize(dimensiom);
		toolbarMonthLabel.setPreferredSize(dimensiom);
		dimensiom = new Dimension(fm.stringWidth("8888")+10,toolbarYearLabel.getHeight());  //$NON-NLS-1$
		toolbarYearLabel.setMaximumSize(dimensiom);
		toolbarYearLabel.setPreferredSize(dimensiom);
	}

	/**
	 * Refresh all main window areas
	 */
	public void refreshAll(boolean jumpToToday) {
		refreshStatistics();
		jumpToDate(jumpToToday?null:calCurrentDate, true);
		refreshNotes();
	}

	/**
	 * This method refresh the main window components according to the curerntly selected date. This include:
	 * 1. Regenerate calendar grid as needed.
	 * 2. Update the current day summary panel
	 * 3. Update toolbar month/year labels
	 * 4. Select/unselect date notes as needed.
	 * @param new_date - if null - today date will be used
	 */
	private void jumpToDate(Date new_date, boolean force_refresh) {

		if(new_date==null) new_date = new Date();
		Calendar calendar = new GregorianCalendar();
		// normalize to 00:00
		Calendar temp_calendar = new GregorianCalendar();
		temp_calendar.setTime(new_date);
		calendar.clear();
		calendar.set(temp_calendar.get(Calendar.YEAR), temp_calendar.get(Calendar.MONTH), temp_calendar.get(Calendar.DAY_OF_MONTH));
		new_date = calendar.getTime();

		boolean need_to_rebuild = false;
		target_day_pos = 0; 

		if(force_refresh) {
			need_to_rebuild = true;
		} else {
			if(calCurrentDate==null) {
				need_to_rebuild = true;
			} else {
				Calendar old_calendar = new GregorianCalendar();
				old_calendar.setTime(calCurrentDate);
				need_to_rebuild = (calendar.get(Calendar.MONTH) != old_calendar.get(Calendar.MONTH))||
						(calendar.get(Calendar.YEAR) != old_calendar.get(Calendar.YEAR));
			}
		}

		//refresh the calendar for the current date
		PCalDayInfo target_day_info = refreshCalendar(new_date, calendar, need_to_rebuild);

		//fill the toolbar labels
		toolbarMonthLabel.setText(monthNames[calendar.get(Calendar.MONTH)]);
		toolbarYearLabel.setText(new Integer(calendar.get(Calendar.YEAR)).toString());

		DateFormat dateFormatter = DateFormat.getDateInstance(DateFormat.SHORT);
		dayInfoLabelDate.setText(dateFormatter.format(new_date));

		for(JLabel label : dayInfoLabels) {
			label.setText("");  //$NON-NLS-1$
		}

		if(target_day_info == null) {
			predictionLabel.setText(Messages.getString("MainWindow.38")); //$NON-NLS-1$
			actionAddMenstruation.setEnabled(true);
			actionAddOvulation.setEnabled(true);
			actionRecordPregnancy.setEnabled(true);
			actionRecordPregInt.setEnabled(true);
			actionRecordBirth.setEnabled(true);
			actionDeleteRecord.setEnabled(false);
		} else
			if(target_day_info.unknown) {
				predictionLabel.setText(Messages.getString("MainWindow.38")); //$NON-NLS-1$
				dayInfoLabels[0].setText(Messages.getString("MainWindow.42")); //$NON-NLS-1$
				dayInfoLabels[1].setText(String.valueOf(target_day_info.day_num+1));
				actionAddMenstruation.setEnabled(true);
				actionAddOvulation.setEnabled(true);
				actionRecordPregnancy.setEnabled(true);
				actionRecordPregInt.setEnabled(true);
				actionRecordBirth.setEnabled(true);
				actionDeleteRecord.setEnabled(false);
			}
			else {
				if(target_day_info.birth) {
					dayInfoLabels[0].setText(Messages.getString("MainWindow.39")); //$NON-NLS-1$
				} else
					if(target_day_info.pregnancy_interruption) {
						dayInfoLabels[0].setText(Messages.getString("MainWindow.11")); //$NON-NLS-1$
					}
					else
						if(target_day_info.pregnancy) {
							dayInfoLabels[0].setText(Messages.getString("MainWindow.40")); //$NON-NLS-1$
							if(target_day_info.day_num==-1) {
								dayInfoLabels[1].setText(Messages.getString("MainWindow.20")); //$NON-NLS-1$
							} else {
								dayInfoLabels[1].setText(String.valueOf(target_day_info.day_num/7+1));
								// calculate the estimated birthday
								Date bdate = PCalendar.engine.getPredictedBirthDay(new_date, target_day_info.day_num);				
								dayInfoLabels[3].setText(dateFormatter.format(bdate));
							}
							dayInfoLabels[2].setText(Messages.getString("MainWindow.41")); //$NON-NLS-1$
						} else { 
							// this is a regular day
							dayInfoLabels[0].setText(Messages.getString("MainWindow.42")); //$NON-NLS-1$
							if(target_day_info.day_num!=-1) {
								dayInfoLabels[1].setText(String.valueOf(target_day_info.day_num+1));
								dayInfoLabels[4].setText(Messages.getString("MainWindow.46")); //$NON-NLS-1$
								dayInfoLabels[5].setText(target_day_info.badFeel?Messages.getString("MainWindow.47"):Messages.getString("MainWindow.48")); //$NON-NLS-1$ //$NON-NLS-2$
							} else {
								dayInfoLabels[1].setText(Messages.getString("MainWindow.21")); //$NON-NLS-1$
							}
							dayInfoLabels[2].setText(Messages.getString("MainWindow.43")); //$NON-NLS-1$
							if(target_day_info.ovulation) {
								dayInfoLabels[3].setText(Messages.getString("MainWindow.34")); //$NON-NLS-1$
							} else { 				
								dayInfoLabels[3].setText(target_day_info.fertile?Messages.getString("MainWindow.44"):Messages.getString("MainWindow.45")); //$NON-NLS-1$ //$NON-NLS-2$
							}
						}
				predictionLabel.setText(target_day_info.estimate?
						Messages.getString("MainWindow.49"):"");	 //$NON-NLS-1$ //$NON-NLS-2$

				boolean recordActionsEnabled = ((target_day_info.day_num != 0) &&
						!target_day_info.birth &&
						!target_day_info.pregnancy_interruption &&
						!target_day_info.ovulation)
						|| target_day_info.estimate;
				actionAddMenstruation.setEnabled(recordActionsEnabled);
				actionAddOvulation.setEnabled(recordActionsEnabled);
				actionRecordPregnancy.setEnabled(recordActionsEnabled);
				actionRecordBirth.setEnabled(recordActionsEnabled);
				actionRecordPregInt.setEnabled(recordActionsEnabled);
				actionDeleteRecord.setEnabled(!recordActionsEnabled);
			}

		calCurrentDate = new_date;
		((AbstractTableModel) calendarTable.getModel()).fireTableDataChanged();
		jumping = true;

		javax.swing.SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				calendarTable.changeSelection(target_day_pos/7, target_day_pos%7, false, false);
				jumping = false;
				selectDateNote(calCurrentDate);
			}
		});

		frame.validate();
	}

	/**
	 * Returns the current calendar start date.
	 * @return current calendar start date
	 */
	public final Date getCurrentCalendarStartDate() {
		return calCurrentStartDate;
	}

	/**
	 * This is an internal method which refresh the calendar widget
	 * @param new_date - the target date to be shown
	 * @param calendar - the target date in a form of calendar
	 * @param need_to_rebuild - if true - the calendar needs to be rebuilt
	 * @return - the day information record for the target date
	 */
	private PCalDayInfo refreshCalendar(Date new_date, Calendar calendar,
			boolean need_to_rebuild) {
		PCalDayInfo target_day_info = null;
		if(!need_to_rebuild) {
			//this is the same month - just set a new position
			target_day_pos = Engine.dateDiff(calCurrentStartDate, new_date);
			target_day_info = PCalendar.engine.getDayInfo(calendar.getTime());
		} else {
			calendarDays.clear();

			int next_month = calendar.get(Calendar.MONTH)+1;
			if(next_month == 12) next_month = 0;

			//find the first day of week which contains the <Month> 1 date
			int firstDayOfWeek = calendar.getFirstDayOfWeek();
			calendar.set(Calendar.DAY_OF_MONTH, 1);
			while(calendar.get(Calendar.DAY_OF_WEEK)!=firstDayOfWeek) {
				calendar.add(Calendar.DATE, -1);
			}

			calCurrentStartDate = calendar.getTime();

			boolean neighbor_month = true;

			while(!((calendar.get(Calendar.DAY_OF_WEEK)==firstDayOfWeek)&&
					(calendar.get(Calendar.MONTH) == next_month))
					) {
				int current_day_of_month = calendar.get(Calendar.DAY_OF_MONTH); 
				if(current_day_of_month==1) neighbor_month=!neighbor_month;

				if(neighbor_month) {
					// this is preceding or succeeding month dates
					// paint in grey
					calendarDays.add(new DayRenderInfo(String.valueOf(current_day_of_month),
							DEFAULT_INACTIVE_MONTH_FG_COLOR,
							DEFAULT_INACTIVE_MONTH_BG_COLOR,
							PCalendar.engine.existsDateNote(calendar.getTime())));				
				} else {
					// this is a current month date
					// show in all colors
					PCalDayInfo current_day_info = 
							PCalendar.engine.getDayInfo(calendar.getTime());
					if(calendar.getTime().equals(new_date)) {
						target_day_info = current_day_info;
						target_day_pos = calendarDays.size(); 
					}

					Color[] dateColors = getDayColors(current_day_info);

					calendarDays.add(new DayRenderInfo(String.valueOf(current_day_of_month),
							dateColors[1],
							dateColors[0],
							PCalendar.engine.existsDateNote(calendar.getTime())));
				}
				calendar.add(Calendar.DATE, 1);
			}

			calendar.setTime(new_date);
		}
		return target_day_info;
	}

	/**
	 * Calculates the background and foreground colors for the day info specified
	 * @param current_day_info - the day information record
	 * @return an array of colors, 0th is background, 1th is foreground
	 */
	public Color[] getDayColors(PCalDayInfo current_day_info) {
		Color[] dateColors = new Color[2];

		dateColors[0] = DEFAULT_UNDEFINED_MONTH_BG_COLOR;
		dateColors[1] = DEFAULT_UNDEFINED_MONTH_FG_COLOR;  

		if(current_day_info!=null) {
			if(current_day_info.birth) {
				if(current_day_info.estimate) {
					dateColors[1] = legendFGColors[IDX_P_BIRTH];
					dateColors[0] = legendBGColors[IDX_P_BIRTH];
				} else {
					dateColors[1] = legendFGColors[IDX_BIRTH];
					dateColors[0] = legendBGColors[IDX_BIRTH];
				}
			} else 
				if(current_day_info.ovulation) {
					dateColors[1] = legendFGColors[IDX_OVUL];
					dateColors[0] = legendBGColors[IDX_OVUL];
				} else
					if(current_day_info.pregnancy || current_day_info.pregnancy_interruption) {
						dateColors[1] = legendFGColors[IDX_PREG];
						dateColors[0] = legendBGColors[IDX_PREG];
					}
					else 
						if (current_day_info.day_num == 0) {
							if(current_day_info.estimate) {
								dateColors[1] = legendFGColors[IDX_P_DAY1];
								dateColors[0] = legendBGColors[IDX_P_DAY1];
							} else {
								dateColors[1] = legendFGColors[IDX_DAY1];
								dateColors[0] = legendBGColors[IDX_DAY1];
							}
						} else
							if(current_day_info.fertile) {
								if(current_day_info.estimate) {
									dateColors[1] = legendFGColors[IDX_P_FERT];
									dateColors[0] = legendBGColors[IDX_P_FERT];
								} else {
									dateColors[1] = legendFGColors[IDX_FERT];
									dateColors[0] = legendBGColors[IDX_FERT];
								}
							}
		}
		return dateColors;
	}

	/**
	 * This method reloads the notes from the engine. If the current calendar date matches some note from the list, 
	 * such note is highlighted
	 */
	private void refreshNotes() {
		TreeSet<Date> notes_dates = new TreeSet<Date>(PCalendar.engine.getNoteDates());
		notesListModel.clear();

		for(Date date : notes_dates) {			
			notesListModel.addElement(date);
		}
		selectDateNote(calCurrentDate);
	}

	/**
	 * Select the note in the list and show in text panel for editing
	 * @param note_date - the target date
	 */
	private void selectDateNote(final Date note_date) {
		if(note_date == null) {
			calCurrentNoteDate = null;
			return;
		}
		if(calCurrentNoteDate!=null) {
			if(calCurrentNoteDate.equals(note_date)) {
				return;
			}
			flushNotesPage();
		}
		// load the new note
		int notePos = notesListModel.indexOf(note_date);
		if(notePos == -1) {
			//no note found for the proposed date unselect everything in the list and show the empty disabled edit pane
			notesDatesList.setValueIsAdjusting(true);
			notesDatesList.clearSelection();
			notesDatesList.setValueIsAdjusting(false);
			notesTextArea.setText(""); //$NON-NLS-1$
			notesTextArea.setEnabled(false);
			calCurrentNoteDate = null;
			actionAddNote.setEnabled(true);
			actionRemoveNote.setEnabled(false);			
		} else {
			notesDatesList.setValueIsAdjusting(true);
			notesDatesList.setSelectedIndex(notePos);
			notesDatesList.setValueIsAdjusting(false);
			String noteText = PCalendar.engine.getDateNote(note_date);
			if(noteText==null) {
				noteText = ""; //$NON-NLS-1$
			}
			notesTextArea.setText(noteText);
			notesTextArea.setEnabled(true);
			calCurrentNoteDate = note_date;
			actionAddNote.setEnabled(false);
			actionRemoveNote.setEnabled(true);			
		}
	}

	/**
	 * This method refreshes the statistics status bar
	 */
	private void refreshStatistics() {
		int periodsCount = PCalendar.engine.getPeriodsCount();
		int minLength = PCalendar.engine.getMinLength();
		int avgLength = PCalendar.engine.getAvgLength();
		int maxLength = PCalendar.engine.getMaxLength();
		String accString = "<font color=%s>%s</font>"; //$NON-NLS-1$

		switch(PCalendar.engine.getCalMethodAccuracy()) {
		case 0: {
			accString = String.format(accString, "#046700", Messages.getString("MainWindow.55"));  //$NON-NLS-1$ //$NON-NLS-2$
			break;
		}
		case 1: {
			accString = String.format(accString, "#83A110", Messages.getString("MainWindow.57")); //$NON-NLS-1$ //$NON-NLS-2$
			break;
		}
		case 2: {
			accString = String.format(accString, "#C10A1D", Messages.getString("MainWindow.59")); //$NON-NLS-1$ //$NON-NLS-2$
			break;
		}
		default: {
			accString = String.format(accString, "#000000", Messages.getString("MainWindow.61")); //$NON-NLS-1$ //$NON-NLS-2$
		}
		}

		statisticsStatusBar.setText(
				String.format(Messages.getString("MainWindow.62"),  //$NON-NLS-1$
						periodsCount, minLength, avgLength, maxLength, accString));
	}

	/**
	 * This method makes the legend pane to reload colors from the application settings 
	 */
	public void refreshLegend() {
		for(int i=0; i<legendLabels.length; i++) {
			legendLabels[i].setBackground(legendBGColors[i]);
			legendLabels[i].setForeground(legendFGColors[i]);
		}
	}

	/**
	 * Turn the main window cursor busy/idle
	 * @param busy
	 */
	public void setBusyCursor(boolean busy)  {
		if(busy) {
			frame.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
		} else {
			frame.setCursor(null);
		}
	}

	/**
	 * Load the stored main window settings
	 */
	private void readSettings() {
		// the window size and position defaults
		final Rectangle DEFAULT_BOUNDS = new Rectangle(20, 20, 640, 380);
		final String prefKey =  "MainWindow"; //$NON-NLS-1$

		Rectangle bounds = MainWindow.loadFrameBounds(prefKey, DEFAULT_BOUNDS);
		frame.setBounds(bounds);

		Preferences windowPrefsNode = PCalendar.settings.node(prefKey);
		notesSplitPane.setDividerLocation(windowPrefsNode.getInt("notesSplit", 150)); //$NON-NLS-1$
	}

	/**
	 * Store the main window settings
	 */
	private void writeSettings() {
		final String prefKey = "MainWindow"; //$NON-NLS-1$
		MainWindow.saveFrameBounds(prefKey, frame.getBounds());
		Preferences windowPrefsNode = PCalendar.settings.node(prefKey); //$NON-NLS-1$
		windowPrefsNode.putInt("notesSplit", notesSplitPane.getDividerLocation()); //$NON-NLS-1$
	}

	/**
	 * This method loads the specified frame bounds from the preferences and validates if 
	 * this frame will fit any of the system screens
	 * @param prefKey a key to be used against the application preferences
	 * @param defaultBounds default frame bounds
	 * @return a proper frame bounds either from preferences or default 
	 */
	public static Rectangle loadFrameBounds(final String prefKey, final Rectangle defaultBounds) {

		Preferences windowPrefsNode = PCalendar.settings.node(prefKey);

		Rectangle bounds = new Rectangle(); 
		bounds.width = windowPrefsNode.getInt("width", defaultBounds.width); //$NON-NLS-1$
		bounds.height = windowPrefsNode.getInt("height", defaultBounds.height); //$NON-NLS-1$
		bounds.x = windowPrefsNode.getInt("posX", defaultBounds.x); //$NON-NLS-1$
		bounds.y = windowPrefsNode.getInt("posY", defaultBounds.y); //$NON-NLS-1$

		// now check if such coordinates can fit any display
		GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
		GraphicsDevice[] gd = ge.getScreenDevices();

		Rectangle finalBounds = defaultBounds;

		for (int i = 0; i < gd.length; i++) {
			GraphicsConfiguration gc = gd[i].getDefaultConfiguration();
			Rectangle r = gc.getBounds();
			if (r.contains(bounds)) {
				finalBounds = bounds; 
			}
		}

		return finalBounds;
	}

	/**
	 * Store the frame bounds in the preferences node specified
	 * @param prefKey preferences node name
	 * @param bounds the frame bounds
	 */
	public static void saveFrameBounds(final String prefKey, final Rectangle bounds) {
		Preferences windowPrefsNode = PCalendar.settings.node(prefKey); //$NON-NLS-1$
		windowPrefsNode.putInt("width", bounds.width); //$NON-NLS-1$
		windowPrefsNode.putInt("height", bounds.height); //$NON-NLS-1$
		windowPrefsNode.putInt("posX", bounds.x); //$NON-NLS-1$
		windowPrefsNode.putInt("posY", bounds.y); //$NON-NLS-1$
	}

	/**
	 * @return the frame
	 */
	public JFrame getFrame() {
		return frame;
	}

	private boolean canCloseFile() {
		//flush the notes pane if active
		flushNotesPage();
		if(!PCalendar.engine.isModified()) return true;
		int q_res = JOptionPane.showConfirmDialog(
				frame, Messages.getString("MainWindow.75"), //$NON-NLS-1$
				Messages.getString("MainWindow.76"), //$NON-NLS-1$
				JOptionPane.YES_NO_CANCEL_OPTION);
		if(q_res==JOptionPane.YES_OPTION) {
			return actionSave.saveActionCore(null);
		}
		return q_res!=JOptionPane.CANCEL_OPTION;
	}

	public boolean saveToFileHandler(final File file, final char[] password) {
		boolean saved = false;

		setBusyCursor(true);
		try {
			saved = true; 
			PCalendar.engine.saveToFile(file, password);
			updateWindowTitle();
		} catch (ParserConfigurationException e1) {
			JOptionPane.showMessageDialog(frame,
					Messages.getString("MainWindow.77") + e1.getMessage() , //$NON-NLS-1$
					Messages.getString("MainWindow.78"), //$NON-NLS-1$
					JOptionPane.ERROR_MESSAGE);
			saved = false;
		} catch (IOException e1) {
			JOptionPane.showMessageDialog(frame,
					Messages.getString("MainWindow.79") + e1.getMessage() , //$NON-NLS-1$
					Messages.getString("MainWindow.80"), //$NON-NLS-1$
					JOptionPane.ERROR_MESSAGE);
			saved = false;
		}
		setBusyCursor(false);
		return saved;
	}

	public class ActionNew extends AbstractAction {
		private static final long serialVersionUID = 70609933524514939L;
		public ActionNew() {
			super(Messages.getString("MainWindow.81"), createResoruceIcon("16x16/new.png")); //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.83")); //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.81.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_N, ActionEvent.CTRL_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			if(canCloseFile()) {
				PCalendar.engine.newFile();
				updateWindowTitle();
				calCurrentNoteDate = null;
				refreshAll(true);
			}			
		}
	}
	public class ActionOpen extends AbstractAction {
		private static final long serialVersionUID = 6094692722720837140L;
		public ActionOpen() {
			super(Messages.getString("MainWindow.84"), createResoruceIcon("16x16/open.png")); //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.86"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.84.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_O, ActionEvent.CTRL_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			if(canCloseFile()) {				
				// the last folder visited for open is stored in the preferences				
				Preferences dialogsNode = PCalendar.settings.node("Dialogs"); //$NON-NLS-1$
				String lastOpenFolder = dialogsNode.get("last file open folder", ""); //$NON-NLS-1$ //$NON-NLS-2$

				final JFileChooser fc = new JFileChooser(lastOpenFolder);
				FileNameExtensionFilter filter = new FileNameExtensionFilter(
						Messages.getString("MainWindow.90"), PCAL_EXT, PCAL_ENC_EXT); //$NON-NLS-1$
				fc.setFileFilter(filter);
				int returnVal = fc.showOpenDialog(frame);
				if (returnVal == JFileChooser.APPROVE_OPTION) {
					dialogsNode.put("last file open folder", fc.getSelectedFile().getParent()); //$NON-NLS-1$
					loadFileHandler(fc.getSelectedFile());
				}
				refreshAll(true);			}			
		}
	}

	/**
	 * Just a shorter wrapper for the loading file handler
	 * @param selectedFile
	 */
	private void loadFileHandler(final File selectedFile) {
		loadFileHandler(selectedFile, null);
	}

	/**
	 * This method is responsible for the actual file loading
	 * @param selectedFile
	 * @param password - a password to be used for the file decryption. 
	 * Can be null or empty for unencrypted files.
	 */
	private void loadFileHandler(final File selectedFile, char[] password) {
		setBusyCursor(true);
		try {
			PCalendar.engine.loadFromFile(selectedFile, password);
			updateWindowTitle();
		} catch (SAXException e1) {
			JOptionPane.showMessageDialog(frame,
					Messages.getString("MainWindow.93") + e1.getMessage() , //$NON-NLS-1$
					Messages.getString("MainWindow.94"), //$NON-NLS-1$
					JOptionPane.ERROR_MESSAGE);
		} catch (IOException e1) {
			JOptionPane.showMessageDialog(frame,
					Messages.getString("MainWindow.95") + e1.getMessage() , //$NON-NLS-1$
					Messages.getString("MainWindow.96"), //$NON-NLS-1$
					JOptionPane.ERROR_MESSAGE);
		} catch (ParserConfigurationException e1) {
			JOptionPane.showMessageDialog(frame,
					Messages.getString("MainWindow.97") + e1.getMessage() , //$NON-NLS-1$
					Messages.getString("MainWindow.98"), //$NON-NLS-1$
					JOptionPane.ERROR_MESSAGE);
		} catch (PasswordRequiredException e) {
			// showPasswordWindow will block the gui unil the password will be entered
			char[] pwd = showPasswordWindow();
			if(pwd!=null) {
				if(pwd.length>0) {
					loadFileHandler(selectedFile, pwd);
				}
			}			
		}
		setBusyCursor(false);
	}

	/**
	 * This method updates the main window title according to the current file name
	 */
	private void updateWindowTitle() {
		File f = PCalendar.engine.getWorkFile();
		if(f == null) {
			// "Periodic Calendar - New File"
			frame.setTitle(Messages.getString("MainWindow.15") + Messages.getString("MainWindow.216") + Messages.getString("MainWindow.217")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
		} else {
			// "Periodic Calendar - <file name>"
			frame.setTitle(Messages.getString("MainWindow.15") + Messages.getString("MainWindow.218") + f.getPath()); //$NON-NLS-1$ //$NON-NLS-2$
		}
	}

	public class ActionSave extends AbstractAction {
		private static final long serialVersionUID = 7138103426857065945L;
		public ActionSave() {
			super(Messages.getString("MainWindow.99"), createResoruceIcon("16x16/filesave.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.101"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.99.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_S, ActionEvent.CTRL_MASK));
		}
		public boolean saveActionCore(ActionEvent e) {
			flushNotesPage();
			File currentWorkFile = PCalendar.engine.getWorkFile();
			if(currentWorkFile != null) {
				// just save a file with current password if any
				return saveToFileHandler(currentWorkFile, null);
			} else {
				return actionSaveAs.saveAsActionCore(e);
			}			
		}
		public void actionPerformed(ActionEvent e) {
			saveActionCore(e);
		}
	}
	public class ActionSaveAs extends AbstractAction {
		private static final long serialVersionUID = 4774617007701485665L;
		public ActionSaveAs() {
			super(Messages.getString("MainWindow.102"), createResoruceIcon("16x16/filesave.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.104"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.102.Mnemonic")); //$NON-NLS-1$
		}
		public boolean saveAsActionCore(ActionEvent e) {
			// get the current path of the currently open file if none
			// get the last folder visited for open stored in the preferences

			boolean saved = false; 

			flushNotesPage();

			File currentFile = PCalendar.engine.getWorkFile();
			String lastOpenFolder = ""; //$NON-NLS-1$
			Preferences dialogsNode = PCalendar.settings.node("Dialogs"); //$NON-NLS-1$

			if(currentFile!=null) {
				lastOpenFolder = currentFile.getParent();
			} else {
				lastOpenFolder = dialogsNode.get("last file open folder", ""); //$NON-NLS-1$ //$NON-NLS-2$
			}

			final JFileChooser fc = new JFileChooser(lastOpenFolder);

			FileNameExtensionFilter plainFileFilter = new FileNameExtensionFilter(
					Messages.getString("MainWindow.109")+ " (."+PCAL_EXT+")", PCAL_EXT); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ 

			FileNameExtensionFilter encryptedFileFilter = new FileNameExtensionFilter(
					Messages.getString("MainWindow.110")+ " (."+PCAL_ENC_EXT+")", PCAL_ENC_EXT); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$)

			fc.addChoosableFileFilter(encryptedFileFilter);
			fc.addChoosableFileFilter(plainFileFilter);

			boolean dialogDismissed = false;

			while(!dialogDismissed) {                            
				int returnVal = fc.showSaveDialog(frame);
				if (returnVal == JFileChooser.APPROVE_OPTION) {
					File f = fc.getSelectedFile();
					char[] password = {};  // remove the password from file by default 

					dialogsNode.put("last file open folder", f.getParent()); //$NON-NLS-1$

					if((fc.getFileFilter()==plainFileFilter) && !f.getName().endsWith("."+PCAL_EXT)) { //$NON-NLS-1$
						f = new File(f.getPath()+"."+PCAL_EXT); //$NON-NLS-1$
					} else					
						if(fc.getFileFilter()==encryptedFileFilter) {
							password = showPasswordWindow();
							if(password == null) {
								// user canceled the password entry
								return saved;
							}
							if(!f.getName().endsWith("."+PCAL_ENC_EXT)) { //$NON-NLS-1$
								f = new File(f.getPath()+"."+PCAL_ENC_EXT); //$NON-NLS-1$
							}
						}

					if(f.exists()) {
						// File %s already exists. Do you want to replace it?
						int q_res = JOptionPane.showConfirmDialog(
								frame, String.format(Messages.getString("MainWindow.214"), f.getPath()), //$NON-NLS-1$
								Messages.getString("MainWindow.215"), //$NON-NLS-1$
								JOptionPane.YES_NO_CANCEL_OPTION);
						if(q_res==JOptionPane.NO_OPTION) {
							continue;
						} else
							if (q_res==JOptionPane.CANCEL_OPTION) {
								break;
							}
					}
					saved = saveToFileHandler(f, password);					
				}
				dialogDismissed = true;
			}
			return saved;
		}
		public void actionPerformed(ActionEvent e) {
			saveAsActionCore(e);
		}
	}

	public class ActionImport extends AbstractAction {
		private static final long serialVersionUID = -8320781357955115059L;
		public ActionImport() {
			super(Messages.getString("MainWindow.186"), createResoruceIcon("16x16/import.png")); //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.188")); //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.186.Mnemonic")); //$NON-NLS-1$
		}
		public void actionPerformed(ActionEvent e) {
			// the last folder visited for open is stored in the preferences				
			Preferences dialogsNode = PCalendar.settings.node("Dialogs"); //$NON-NLS-1$
			String lastOpenFolder = dialogsNode.get("last file open folder", ""); //$NON-NLS-1$ //$NON-NLS-2$

			final JFileChooser fc = new JFileChooser(lastOpenFolder);
			int returnVal = fc.showOpenDialog(frame);
			if (returnVal == JFileChooser.APPROVE_OPTION) {
				dialogsNode.put("last file open folder", fc.getSelectedFile().getParent()); //$NON-NLS-1$
				try {
					PCalendar.engine.importFromFile(fc.getSelectedFile());
				} catch (IOException e1) {
					JOptionPane.showMessageDialog(frame,
							Messages.getString("MainWindow.189") + e1.getLocalizedMessage(), //$NON-NLS-1$
							Messages.getString("MainWindow.190"), //$NON-NLS-1$
							JOptionPane.ERROR_MESSAGE);
				} catch (ParseException e1) {
					JOptionPane.showMessageDialog(frame,
							Messages.getString("MainWindow.191"), //$NON-NLS-1$
							Messages.getString("MainWindow.192"), //$NON-NLS-1$
							JOptionPane.ERROR_MESSAGE);
				}
				finally {
					refreshAll(true);			
				}

			}
		}			
	}

	public class ActionExport extends AbstractAction {
		private static final long serialVersionUID = 8762257051182815236L;
		public ActionExport() {
			super(Messages.getString("MainWindow.193"), createResoruceIcon("16x16/export.png")); //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.195")); //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.193.Mnemonic")); //$NON-NLS-1$
		}
		public void actionPerformed(ActionEvent e) {
			// get the last folder visited for open stored in the preferences
			Preferences dialogsNode = PCalendar.settings.node("Dialogs"); //$NON-NLS-1$
			String lastOpenFolder = dialogsNode.get("last file open folder", ""); //$NON-NLS-1$ //$NON-NLS-2$

			final JFileChooser fc = new JFileChooser(lastOpenFolder);
			int returnVal = fc.showSaveDialog(frame);
			if (returnVal == JFileChooser.APPROVE_OPTION) {
				dialogsNode.put("last file open folder", fc.getSelectedFile().getParent()); //$NON-NLS-1$
				try {
					PCalendar.engine.exportToFile(fc.getSelectedFile());
				} catch (IOException e1) {
					JOptionPane.showMessageDialog(frame,
							Messages.getString("MainWindow.196") + e1.getMessage(), //$NON-NLS-1$
							Messages.getString("MainWindow.197"), //$NON-NLS-1$
							JOptionPane.ERROR_MESSAGE);
				}
			}
		}
	}

	public class ActionPreferences extends AbstractAction {
		private static final long serialVersionUID = 6062980706660003945L;
		public ActionPreferences() {
			super(Messages.getString("MainWindow.201"), createResoruceIcon("16x16/preferences.png")); //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.200")); //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.201.Mnemonic")); //$NON-NLS-1$
		}
		public void actionPerformed(ActionEvent e) {
			if(prefsDialog == null) {
				prefsDialog = new PCalPrefDialog();				
			}
			prefsDialog.showDialog();
		}
	}

	public class ActionExit extends AbstractAction {
		private static final long serialVersionUID = 4577607875914425290L;
		public ActionExit() {
			super(Messages.getString("MainWindow.112"), createResoruceIcon("16x16/exit.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.114"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.112.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_Q, ActionEvent.CTRL_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			if(canCloseFile()) {
				writeSettings();
				frame.setVisible(false);
				frame.dispose();
				System.exit(0);
			}
		}
	}

	public class ActionNextMonth extends AbstractAction {
		private static final long serialVersionUID = -7213636761893581907L;
		public ActionNextMonth() {
			super(Messages.getString("MainWindow.115"), createResoruceIcon("16x16/forward.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.117"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.115.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_M, ActionEvent.CTRL_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			Calendar calendar = new GregorianCalendar();
			calendar.setTime(calCurrentDate);
			calendar.add(Calendar.MONTH, 1);
			jumpToDate(calendar.getTime(), true);
		}
	}

	public class ActionPrevMonth extends AbstractAction {
		private static final long serialVersionUID = 2449966282061999064L;
		public ActionPrevMonth() {
			super(Messages.getString("MainWindow.118"), createResoruceIcon("16x16/backward.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.120"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.118.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_M, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			Calendar calendar = new GregorianCalendar();
			calendar.setTime(calCurrentDate);
			calendar.add(Calendar.MONTH, -1);
			jumpToDate(calendar.getTime(), true);
		}
	}

	public class ActionNextYear extends AbstractAction {
		private static final long serialVersionUID = -1576689620404140834L;
		public ActionNextYear() {
			super(Messages.getString("MainWindow.121"), createResoruceIcon("16x16/last.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.123"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.121.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_Y, ActionEvent.CTRL_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			Calendar calendar = new GregorianCalendar();
			calendar.setTime(calCurrentDate);
			calendar.add(Calendar.YEAR, 1);
			jumpToDate(calendar.getTime(), true);
		}
	}

	public class ActiomPrevYear extends AbstractAction {
		private static final long serialVersionUID = -8882893657100610398L;
		public ActiomPrevYear() {
			super(Messages.getString("MainWindow.124"), createResoruceIcon("16x16/first.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.126"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.124.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_Y, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			Calendar calendar = new GregorianCalendar();
			calendar.setTime(calCurrentDate);
			calendar.add(Calendar.YEAR, -1);
			jumpToDate(calendar.getTime(), true);
		}
	}

	public class ActionToday extends AbstractAction {
		private static final long serialVersionUID = -7542164554291154210L;
		public ActionToday() {
			super(Messages.getString("MainWindow.127"), createResoruceIcon("16x16/jump-to.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.129"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.127.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_T, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			jumpToDate(null, false);
		}
	}

	public class ActionAddMenstruation extends AbstractAction {
		private static final long serialVersionUID = -1428104594702264450L;
		public ActionAddMenstruation() {
			super(Messages.getString("MainWindow.130"), createResoruceIcon("16x16/add.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.132"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.130.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_A, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			PCalendar.engine.addStartDate(calCurrentDate);
			refreshStatistics();
			jumpToDate(calCurrentDate, true);
		}
	}

	public class ActionAddOvulation extends AbstractAction {
		private static final long serialVersionUID = 1L;
		public ActionAddOvulation() {
			super(Messages.getString("MainWindow.131"), createResoruceIcon("16x16/ovulation.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.132"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.131.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_O, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			PCalendar.engine.addOvulationDate(calCurrentDate);
			refreshStatistics();
			jumpToDate(calCurrentDate, true);
		}
	}

	public class ActionRecordPregnancy extends AbstractAction {
		private static final long serialVersionUID = -1960772136271613819L;
		public ActionRecordPregnancy() {
			super(Messages.getString("MainWindow.133"), createResoruceIcon("16x16/add.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.135"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.133.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_P, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			Date pregnancyStartDate = calCurrentDate;
			Date lastMensDate = PCalendar.engine.getLastMenstruationDate();			
			if(lastMensDate!=null) {

				String lastMensDateString = DateFormat.getDateInstance(DateFormat.SHORT).format(lastMensDate); 
				Object[] options = { lastMensDateString + Messages.getString("MainWindow.136"), //$NON-NLS-1$
						DateFormat.getDateInstance(DateFormat.SHORT).format(calCurrentDate) + Messages.getString("MainWindow.137"), //$NON-NLS-1$
						Messages.getString("MainWindow.138")}; //$NON-NLS-1$

				int q_res = JOptionPane.showOptionDialog(frame,
						Messages.getString("MainWindow.139")+ //$NON-NLS-1$
						Messages.getString("MainWindow.140") + lastMensDateString + ".\n"+ //$NON-NLS-1$ //$NON-NLS-2$
						Messages.getString("MainWindow.142"), //$NON-NLS-1$
						Messages.getString("MainWindow.143"), //$NON-NLS-1$
						JOptionPane.YES_NO_CANCEL_OPTION,
						JOptionPane.QUESTION_MESSAGE,
						null,
						options,
						options[0]);
				switch(q_res) {
				case JOptionPane.YES_OPTION: pregnancyStartDate = lastMensDate; break;
				case JOptionPane.CANCEL_OPTION: return;
				}
			}

			PCalendar.engine.addPregnancyDate(pregnancyStartDate);
			refreshStatistics();
			jumpToDate(calCurrentDate, true);
		}
	}

	public class ActionRecordBirth extends AbstractAction {
		private static final long serialVersionUID = -7421773784507675941L;
		public ActionRecordBirth() {
			super(Messages.getString("MainWindow.144"), createResoruceIcon("16x16/add.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.146"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.144.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_B, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			PCalendar.engine.addBirthDate(calCurrentDate);
			refreshStatistics();
			jumpToDate(calCurrentDate, true);
		}
	}

	public class ActionRecordPregInt extends AbstractAction {
		private static final long serialVersionUID = 1L;
		public ActionRecordPregInt() {
			super(Messages.getString("MainWindow.141"), createResoruceIcon("16x16/cancel.png")); //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.148"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.141.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_I, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			PCalendar.engine.addPregnancyInterruptDate(calCurrentDate);
			refreshStatistics();
			jumpToDate(calCurrentDate, true);
		}
	}

	public class ActionDeleteRecord extends AbstractAction {
		private static final long serialVersionUID = 6375480347509749765L;
		public ActionDeleteRecord() {
			super(Messages.getString("MainWindow.147"), createResoruceIcon("16x16/remove.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.149"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.147.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_D, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			PCalendar.engine.removeDateRecord(calCurrentDate);
			refreshStatistics();
			jumpToDate(calCurrentDate, true);
		}
	}	

	public class ActionShowBBTDialog extends AbstractAction {
		private static final long serialVersionUID = 1L;
		public ActionShowBBTDialog() {
			super(Messages.getString("MainWindow.12"), createResoruceIcon("16x16/bbt.png")); //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.14")); //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.19")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_S, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));

		}
		public void actionPerformed(ActionEvent e) {
			if(bbtDialog == null) {
				bbtDialog = new PCaBBTDialog();
			}
			bbtDialog.showDialog();
		}
	}

	public class ActionShowStatistics extends AbstractAction {
		private static final long serialVersionUID = 3403436701466016364L;
		public ActionShowStatistics() {
			super(Messages.getString("MainWindow.150"), createResoruceIcon("16x16/stats.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.152"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.150.Mnemonic")); //$NON-NLS-1$
		}
		public void actionPerformed(ActionEvent e) {
			if(statisticsDialog == null) {
				statisticsDialog = new PCalStatisticsDialog();				
			}
			statisticsDialog.showDialog();
		}
	}

	public class ActionAddNote extends AbstractAction {
		private static final long serialVersionUID = 6111798952805072738L;
		public ActionAddNote() {
			super(Messages.getString("MainWindow.153"), createResoruceIcon("16x16/add.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.155"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.153.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_N, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			if(PCalendar.engine.getDateNote(calCurrentDate) == null) {
				PCalendar.engine.setDateNote(calCurrentDate, ""); //$NON-NLS-1$
			}
			jumpToDate(calCurrentDate, true);
			refreshNotes();
			notesTextArea.requestFocusInWindow();
		}
	}

	public class ActionRemoveNote extends AbstractAction {
		private static final long serialVersionUID = -4933134107660700206L;
		public ActionRemoveNote() {
			super(Messages.getString("MainWindow.157"), createResoruceIcon("16x16/remove.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.159"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.157.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_R, ActionEvent.CTRL_MASK+ActionEvent.SHIFT_MASK));
		}
		public void actionPerformed(ActionEvent e) {
			if(PCalendar.engine.getDateNote(calCurrentDate) != null) {
				PCalendar.engine.removeDateNote(calCurrentDate);
			}
			calCurrentNoteDate = null;
			jumpToDate(calCurrentDate, true);
			refreshNotes();
		}
	}

	public class ActionContent extends AbstractAction {
		private static final long serialVersionUID = 8438859177628611109L;
		public ActionContent() {
			super(Messages.getString("MainWindow.160"), createResoruceIcon("16x16/contents.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.162"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.160.Mnemonic")); //$NON-NLS-1$
			putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(
					KeyEvent.VK_F1, 0));
		}
		public void actionPerformed(ActionEvent e) {
			if(helpDialog == null) {
				helpDialog = new PCalHelpWindow();
			} else {
				helpDialog.setVisible(true);
			}
		}
	}


	public class ActionAbout extends AbstractAction {
		private static final long serialVersionUID = 4391143612433028422L;
		public ActionAbout() {
			super(Messages.getString("MainWindow.172"), createResoruceIcon("16x16/pcalendar.png"));   //$NON-NLS-1$ //$NON-NLS-2$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.174"));  //$NON-NLS-1$
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.172.Mnemonic")); //$NON-NLS-1$
		}
		public void actionPerformed(ActionEvent e) {
			final JDialog aboutDialog = new JDialog(frame, Messages.getString("MainWindow.175"), true);  //$NON-NLS-1$
			aboutDialog.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
			aboutDialog.setLayout(new GridBagLayout());

			GridBagConstraints c = new GridBagConstraints();
			c.gridx = 1;
			c.gridheight = 4;			
			c.insets.top = 5;
			c.insets.left = 5;
			c.anchor = GridBagConstraints.FIRST_LINE_START;
			aboutDialog.add(new JLabel(createResoruceIcon("orgbook.png")), c); //$NON-NLS-1$

			c = new GridBagConstraints();
			c.gridx = 2;
			c.gridy = 0;
			c.weighty = 1.0;
			c.insets.top = 10;
			c.insets.bottom = 15;
			c.insets.right = 10;
			aboutDialog.add(new JLabel(Messages.getString("MainWindow.176")), c);  //$NON-NLS-1$

			c = new GridBagConstraints();
			c.gridx = 2;
			c.gridy = 1;
			c.insets.top = 5;
			c.insets.right = 10;
			aboutDialog.add(new JLabel(Messages.getString("MainWindow.177") + PCalendar.APP_VERSION), c);  //$NON-NLS-1$

			c = new GridBagConstraints();
			c.gridx = 2;
			c.gridy = 2;
			c.insets.top = 5;
			c.insets.right = 10;
			aboutDialog.add(new JLabel(Messages.getString("MainWindow.178")), c);  //$NON-NLS-1$

			c = new GridBagConstraints();
			c.gridx = 2;
			c.gridy = 3;
			c.insets.top = 5;
			c.insets.right = 10;
			aboutDialog.add(new JLabel(Messages.getString("MainWindow.179")), c);  //$NON-NLS-1$

			JButton b = new JButton(Messages.getString("MainWindow.180"), createResoruceIcon("16x16/ok.png"));  //$NON-NLS-1$ //$NON-NLS-2$
			c = new GridBagConstraints();
			c.gridx = 1;
			c.gridy = 4;
			c.gridwidth = 2;
			c.insets.top = 15;
			c.insets.bottom = 10;
			aboutDialog.add(b, c);
			JRootPane rootPane = aboutDialog.getRootPane();
			rootPane.setDefaultButton(b);

			b.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					aboutDialog.setVisible(false);
					aboutDialog.dispose();
				}
			});

			for(ActionListener al : b.getActionListeners()) {
				rootPane.registerKeyboardAction(al, 
						KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), 
						JComponent.WHEN_IN_FOCUSED_WINDOW);
			}

			aboutDialog.setResizable(false);			
			aboutDialog.pack();			
			aboutDialog.setLocationRelativeTo(frame);			
			aboutDialog.setVisible(true);
		}
	}

	public class ActionLicense extends AbstractAction {
		private static final long serialVersionUID = -1215691181077118833L;
		public ActionLicense() {
			super(Messages.getString("MainWindow.181"), createResoruceIcon("16x16/emacs.png")); //$NON-NLS-1$ //$NON-NLS-2$ 
			putValue(MNEMONIC_KEY, Messages.getMnemonic("MainWindow.181.Mnemonic"));//$NON-NLS-1$
			putValue(SHORT_DESCRIPTION, Messages.getString("MainWindow.183")); //$NON-NLS-1$
		}
		public void actionPerformed(ActionEvent e) {
			final JDialog licenseDialog = new JDialog(frame, Messages.getString("MainWindow.184"), true); //$NON-NLS-1$
			licenseDialog.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
			licenseDialog.setLayout(new GridBagLayout());

			JEditorPane editorPane = new JEditorPane();
			editorPane.setEditable(false);
			editorPane.setFocusable(false);
			java.net.URL helpURL = MainWindow.class.getResource("help/gpl-license.html"); //$NON-NLS-1$
			if (helpURL != null) {
				try {
					editorPane.setPage(helpURL);
				} catch (IOException ee) {
					// this should normally never happen
					ee.printStackTrace();
				}
			}

			// Put the editor pane in a scroll pane.
			JScrollPane editorScrollPane = new JScrollPane(editorPane);
			editorScrollPane.setPreferredSize(new Dimension(500, 400));
			editorScrollPane.setMinimumSize(new Dimension(10, 10));
			editorScrollPane.setFocusable(true);

			GridBagConstraints c = new GridBagConstraints();
			c.insets.top = 5;
			c.insets.left = 5;
			c.insets.right = 5;
			c.insets.bottom = 5;
			c.weightx = 1.0;
			c.weighty = 1.0;
			c.fill = GridBagConstraints.BOTH;
			c.anchor = GridBagConstraints.CENTER;

			licenseDialog.add(editorScrollPane, c);

			JButton b = new JButton(Messages.getString("MainWindow.185"), createResoruceIcon("16x16/ok.png"));  //$NON-NLS-1$ //$NON-NLS-2$
			b.setFocusable(false);
			c = new GridBagConstraints();
			c.gridy = 2;
			c.insets.bottom = 5;
			c.anchor = GridBagConstraints.CENTER;			
			licenseDialog.add(b, c);
			licenseDialog.getRootPane().setDefaultButton(b);

			b.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					licenseDialog.setVisible(false);
					licenseDialog.dispose();
				}
			});
			JRootPane rootPane = licenseDialog.getRootPane();
			for(ActionListener al : b.getActionListeners()) {
				rootPane.registerKeyboardAction(al, 
						KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), 
						JComponent.WHEN_IN_FOCUSED_WINDOW);
			}
			licenseDialog.pack();			
			licenseDialog.setLocationRelativeTo(frame);			
			licenseDialog.setVisible(true);
		}			
	}

	private void flushNotesPage() {
		if(calCurrentNoteDate!=null) {
			//store the previous note
			PCalendar.engine.setDateNote(calCurrentNoteDate, notesTextArea.getText());
		}
	}

	/**
	 * Show the password entry window.
	 * @return password or null if entry was canceled
	 */
	private char[] showPasswordWindow() {
		final JPasswordField passwordField = new JPasswordField(10);
		final String questionText = Messages.getString("MainWindow.9");		         //$NON-NLS-1$
		final Object[] array = {questionText, passwordField};

		final JOptionPane pane = new JOptionPane(array, 
				JOptionPane.QUESTION_MESSAGE,
				JOptionPane.OK_CANCEL_OPTION);

		final JDialog dialog = pane.createDialog(null, Messages.getString("MainWindow.10")); //$NON-NLS-1$

		dialog.addComponentListener(new ComponentAdapter() {
			@Override
			public void componentShown(ComponentEvent ce) {
				passwordField.requestFocusInWindow();
			}
		});

		dialog.pack();
		dialog.setVisible(true);

		Object selectedValue = pane.getValue();
		if(selectedValue != null) {
			if(selectedValue instanceof Integer) {
				if((Integer)selectedValue == JOptionPane.OK_OPTION) {
					return passwordField.getPassword();
				}
			}
		}
		return null;
	}

	/**
	 * Create and initialize the button.
	 * @param imageName
	 * @param actionCommand
	 * @param toolTipText
	 * @return
	 */
	public static JButton createToolbarButton(String imageName,
			String actionCommand,
			String toolTipText,
			ActionListener actionListener) {
		JButton button = new JButton(createResoruceIcon(imageName));
		button.setActionCommand(actionCommand);
		button.setToolTipText(toolTipText);
		button.addActionListener(actionListener);
		return button;
	}

	/**
	 * @return the main window graphics for the children frames to calculate their sizes before being shown
	 */
	public Graphics getGraphics() {
		return calendarTable.getGraphics();
	}

}