/*
 * This file is part of McIDAS-V
 *
 * Copyright 2007-2016
 * Space Science and Engineering Center (SSEC)
 * University of Wisconsin - Madison
 * 1225 W. Dayton Street, Madison, WI 53706, USA
 * https://www.ssec.wisc.edu/mcidas
 * 
 * All Rights Reserved
 * 
 * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and
 * some McIDAS-V source code is based on IDV and VisAD source code.  
 * 
 * McIDAS-V is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * McIDAS-V 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser Public License
 * along with this program.  If not, see http://www.gnu.org/licenses.
 */
package edu.wisc.ssec.mcidasv.data.dateChooser;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseListener;

import java.text.DateFormatSymbols;

import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;

/**
 * JDayChooser is a bean for choosing a day.
 * 
 * @author Kai Toedter
 * @version $LastChangedRevision: 107 $
 * @version $LastChangedDate: 2009-05-01 15:48:00 +0200 (Fr, 01 Mai 2009) $
 */
public class JDayChooser extends JPanel implements ActionListener, KeyListener,
                FocusListener {
        
        private static final long serialVersionUID = 5876398337018781820L;
        public static final String BEG_DAY = "BEG_DAY";
        public static final String END_DAY = "END_DAY";

        protected JButton[] days;

        protected JButton[] weeks;

        protected JButton selectedDay;

        protected JPanel weekPanel;

        protected JPanel dayPanel;

        protected int day;

        protected Color oldDayBackgroundColor;

        protected Color selectedColor;

        protected Color sundayForeground;

        protected Color weekdayForeground;

        protected Color decorationBackgroundColor;

        protected String[] dayNames;

        protected Calendar calendar;

        protected Calendar today;

        protected Locale locale;

        protected boolean initialized;

        protected boolean weekOfYearVisible;

        protected boolean decorationBackgroundVisible = true;

        protected boolean decorationBordersVisible;

        protected boolean dayBordersVisible;

        private boolean alwaysFireDayProperty;

        protected Date minSelectableDate;

        protected Date maxSelectableDate;

        protected Date defaultMinSelectableDate;

        protected Date defaultMaxSelectableDate;

        protected int maxDayCharacters;

        /**
         * Default JDayChooser constructor.
         */
        public JDayChooser() {
                this(false);
        }

        /**
         * JDayChooser constructor.
         * 
         * @param weekOfYearVisible
         *            true, if the weeks of a year shall be shown
         */
        public JDayChooser(boolean weekOfYearVisible) {
                setName("JDayChooser");
                setBackground(Color.blue);
                this.weekOfYearVisible = weekOfYearVisible;
                locale = Locale.getDefault();
                days = new JButton[49];
                selectedDay = null;
                calendar = Calendar.getInstance(locale);
                today = (Calendar) calendar.clone();

                setLayout(new BorderLayout());

                dayPanel = new JPanel();
                dayPanel.setLayout(new GridLayout(7, 7));

                sundayForeground = new Color(164, 0, 0);
                weekdayForeground = new Color(0, 90, 164);

                // decorationBackgroundColor = new Color(194, 211, 252);
                // decorationBackgroundColor = new Color(206, 219, 246);
                decorationBackgroundColor = new Color(210, 228, 238);

                for (int y = 0; y < 7; y++) {
                        for (int x = 0; x < 7; x++) {
                                int index = x + (7 * y);

                                if (y == 0) {
                                        // Create a button that doesn't react on clicks or focus
                                        // changes.
                                        // Thanks to Thomas Schaefer for the focus hint :)
                                        days[index] = new DecoratorButton();
                                } else {
                                        days[index] = new JButton("x") {
                                                private static final long serialVersionUID = -7433645992591669725L;

                                                public void paint(Graphics g) {
                                                        if ("Windows".equals(UIManager.getLookAndFeel()
                                                                        .getID())) {
                                                                // this is a hack to get the background painted
                                                                // when using Windows Look & Feel
                                                                if (selectedDay == this) {
                                                                        g.setColor(selectedColor);
                                                                        g.fillRect(0, 0, getWidth(), getHeight());
                                                                }
                                                        }
                                                        super.paint(g);
                                                }

                                        };
                                        days[index].addActionListener(this);
                                        days[index].addKeyListener(this);
                                        days[index].addFocusListener(this);
                                }

                                days[index].setMargin(new Insets(0, 0, 0, 0));
                                days[index].setFocusPainted(false);
                                dayPanel.add(days[index]);
                        }
                }

                weekPanel = new JPanel();
                weekPanel.setLayout(new GridLayout(7, 1));
                weeks = new JButton[7];

                for (int i = 0; i < 7; i++) {
                        weeks[i] = new DecoratorButton();
                        weeks[i].setMargin(new Insets(0, 0, 0, 0));
                        weeks[i].setFocusPainted(false);
                        weeks[i].setForeground(new Color(100, 100, 100));

                        if (i != 0) {
                                weeks[i].setText("0" + (i + 1));
                        }

                        weekPanel.add(weeks[i]);
                }

                Calendar tmpCalendar = Calendar.getInstance();
                tmpCalendar.set(1, 0, 1, 1, 1);
                defaultMinSelectableDate = tmpCalendar.getTime();
                minSelectableDate = defaultMinSelectableDate;
                tmpCalendar.set(9999, 0, 1, 1, 1);
                defaultMaxSelectableDate = tmpCalendar.getTime();
                maxSelectableDate = defaultMaxSelectableDate;

                init();

                setDay(Calendar.getInstance().get(Calendar.DAY_OF_MONTH));
                add(dayPanel, BorderLayout.CENTER);

                if (weekOfYearVisible) {
                        add(weekPanel, BorderLayout.WEST);
                }
                initialized = true;
                updateUI();
        }

        /**
         * Initilizes the locale specific names for the days of the week.
         */
        protected void init() {
                JButton testButton = new JButton();
                oldDayBackgroundColor = testButton.getBackground();
                selectedColor = new Color(160, 160, 160);

                Date date = calendar.getTime();
                calendar = Calendar.getInstance(locale);
                calendar.setTime(date);

                drawDayNames();
                drawDays();
        }

        /**
         * Draws the day names of the day columnes.
         */
        private void drawDayNames() {
                int firstDayOfWeek = calendar.getFirstDayOfWeek();
                DateFormatSymbols dateFormatSymbols = new DateFormatSymbols(locale);
                dayNames = dateFormatSymbols.getShortWeekdays();

                int day = firstDayOfWeek;

                for (int i = 0; i < 7; i++) {
                        if (maxDayCharacters > 0 && maxDayCharacters < 5) {
                                if (dayNames[day].length() >= maxDayCharacters) {
                                        dayNames[day] = dayNames[day]
                                                        .substring(0, maxDayCharacters);
                                }
                        }

                        days[i].setText(dayNames[day]);

                        if (day == 1) {
                                days[i].setForeground(sundayForeground);
                        } else {
                                days[i].setForeground(weekdayForeground);
                        }

                        if (day < 7) {
                                day++;
                        } else {
                                day -= 6;
                        }
                }
        }

        /**
         * Initializes both day names and weeks of the year.
         */
        protected void initDecorations() {
                for (int x = 0; x < 7; x++) {
                        days[x].setContentAreaFilled(decorationBackgroundVisible);
                        days[x].setBorderPainted(decorationBordersVisible);
                        days[x].invalidate();
                        days[x].repaint();
                        weeks[x].setContentAreaFilled(decorationBackgroundVisible);
                        weeks[x].setBorderPainted(decorationBordersVisible);
                        weeks[x].invalidate();
                        weeks[x].repaint();
                }
        }

        /**
         * Hides and shows the week buttons.
         */
        protected void drawWeeks() {
                Calendar tmpCalendar = (Calendar) calendar.clone();

                for (int i = 1; i < 7; i++) {
                        tmpCalendar.set(Calendar.DAY_OF_MONTH, (i * 7) - 6);

                        int week = tmpCalendar.get(Calendar.WEEK_OF_YEAR);
                        String buttonText = Integer.toString(week);

                        if (week < 10) {
                                buttonText = "0" + buttonText;
                        }

                        weeks[i].setText(buttonText);

                        if ((i == 5) || (i == 6)) {
                                weeks[i].setVisible(days[i * 7].isVisible());
                        }
                }
        }

        /**
         * Hides and shows the day buttons.
         */
        protected void drawDays() {
                Calendar tmpCalendar = (Calendar) calendar.clone();
                tmpCalendar.set(Calendar.HOUR_OF_DAY, 0);
                tmpCalendar.set(Calendar.MINUTE, 0);
                tmpCalendar.set(Calendar.SECOND, 0);
                tmpCalendar.set(Calendar.MILLISECOND, 0);

                Calendar minCal = Calendar.getInstance();
                minCal.setTime(minSelectableDate);
                minCal.set(Calendar.HOUR_OF_DAY, 0);
                minCal.set(Calendar.MINUTE, 0);
                minCal.set(Calendar.SECOND, 0);
                minCal.set(Calendar.MILLISECOND, 0);

                Calendar maxCal = Calendar.getInstance();
                maxCal.setTime(maxSelectableDate);
                maxCal.set(Calendar.HOUR_OF_DAY, 0);
                maxCal.set(Calendar.MINUTE, 0);
                maxCal.set(Calendar.SECOND, 0);
                maxCal.set(Calendar.MILLISECOND, 0);

                int firstDayOfWeek = tmpCalendar.getFirstDayOfWeek();
                tmpCalendar.set(Calendar.DAY_OF_MONTH, 1);

                int firstDay = tmpCalendar.get(Calendar.DAY_OF_WEEK) - firstDayOfWeek;

                if (firstDay < 0) {
                        firstDay += 7;
                }

                int i;

                for (i = 0; i < firstDay; i++) {
                        days[i + 7].setVisible(false);
                        days[i + 7].setText("");
                }

                tmpCalendar.add(Calendar.MONTH, 1);

                Date firstDayInNextMonth = tmpCalendar.getTime();
                tmpCalendar.add(Calendar.MONTH, -1);

                Date day = tmpCalendar.getTime();
                int n = 0;
                Color foregroundColor = getForeground();

                while (day.before(firstDayInNextMonth)) {
                        days[i + n + 7].setText(Integer.toString(n + 1));
                        days[i + n + 7].setVisible(true);

                        if ((tmpCalendar.get(Calendar.DAY_OF_YEAR) == today
                                        .get(Calendar.DAY_OF_YEAR))
                                        && (tmpCalendar.get(Calendar.YEAR) == today
                                                        .get(Calendar.YEAR))) {
                                days[i + n + 7].setForeground(sundayForeground);
                        } else {
                                days[i + n + 7].setForeground(foregroundColor);
                        }

                        if ((n + 1) == this.day) {
                                days[i + n + 7].setBackground(selectedColor);
                                selectedDay = days[i + n + 7];
                        } else {
                                days[i + n + 7].setBackground(oldDayBackgroundColor);
                        }

                        if (tmpCalendar.before(minCal) || tmpCalendar.after(maxCal)) {
                                days[i + n + 7].setEnabled(false);
                        } else {
                                days[i + n + 7].setEnabled(true);
                        }

                        n++;
                        tmpCalendar.add(Calendar.DATE, 1);
                        day = tmpCalendar.getTime();
                }

                for (int k = n + i + 7; k < 49; k++) {
                        days[k].setVisible(false);
                        days[k].setText("");
                }

                drawWeeks();
        }

        /**
         * Returns the locale.
         * 
         * @return the locale value
         * 
         * @see #setLocale
         */
        public Locale getLocale() {
                return locale;
        }

        /**
         * Sets the locale.
         * 
         * @param locale
         *            the new locale value
         * 
         * @see #getLocale
         */
        public void setLocale(Locale locale) {
                if (!initialized) {
                        super.setLocale(locale);
                } else {
                        this.locale = locale;
                        super.setLocale(locale);
                        init();
                }
        }

        /**
         * Sets the day. This is a bound property.
         * 
         * @param d
         *            the day
         * 
         * @see #getDay
         */
        public void setDay(int d) {
                if (d < 1) {
                        d = 1;
                }
                Calendar tmpCalendar = (Calendar) calendar.clone();
                tmpCalendar.set(Calendar.DAY_OF_MONTH, 1);
                tmpCalendar.add(Calendar.MONTH, 1);
                tmpCalendar.add(Calendar.DATE, -1);

                int maxDaysInMonth = tmpCalendar.get(Calendar.DATE);

                if (d > maxDaysInMonth) {
                        d = maxDaysInMonth;
                }

                int oldDay = day;
                day = d;

                if (selectedDay != null) {
                        selectedDay.setBackground(oldDayBackgroundColor);
                        selectedDay.repaint();
                }

                for (int i = 7; i < 49; i++) {
                        if (days[i].getText().equals(Integer.toString(day))) {
                                selectedDay = days[i];
                                selectedDay.setBackground(selectedColor);
                                break;
                        }
                }

                if (alwaysFireDayProperty) {
                        firePropertyChange("day", 0, day);
                } else {
                        firePropertyChange("day", oldDay, day);
                }
        }

        /**
         * this is needed for JDateChooser.
         * 
         * @param alwaysFire
         *            true, if day property shall be fired every time a day is
         *            chosen.
         */
        public void setAlwaysFireDayProperty(boolean alwaysFire) {
                alwaysFireDayProperty = alwaysFire;
        }

        /**
         * Returns the selected day.
         * 
         * @return the day value
         * 
         * @see #setDay
         */
        public int getDay() {
                return day;
        }
        
        /**
         * Returns the selected month.
         * 
         * @return the month value
         * 
         * @see #setMonth
         */
        public int getMonth() {
                return calendar.get(Calendar.MONTH);
        }
        
        /**
         * Returns the selected year.
         * 
         * @return the year value
         * 
         * @see #setYear
         */
        public int getYear() {
                return calendar.get(Calendar.YEAR);
        }

        /**
         * Sets a specific month. This is needed for correct graphical
         * representation of the days.
         * 
         * @param month
         *            the new month
         */
        public void setMonth(int month) {
                calendar.set(Calendar.MONTH, month);
                int maxDays = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                
                int adjustedDay = day;
                if (day > maxDays) {
                        adjustedDay = maxDays;
                        setDay(adjustedDay);
                }

                drawDays();
        }

        /**
         * Sets a specific year. This is needed for correct graphical representation
         * of the days.
         * 
         * @param year
         *            the new year
         */
        public void setYear(int year) {
                calendar.set(Calendar.YEAR, year);
                drawDays();
        }

        /**
         * Sets a specific calendar. This is needed for correct graphical
         * representation of the days.
         * 
         * @param calendar
         *            the new calendar
         */
        public void setCalendar(Calendar calendar) {
                this.calendar = calendar;
                drawDays();
        }

        /**
         * Sets the font property.
         * 
         * @param font
         *            the new font
         */
        public void setFont(Font font) {
                if (days != null) {
                        for (int i = 0; i < 49; i++) {
                                days[i].setFont(font);
                        }
                }
                if (weeks != null) {
                        for (int i = 0; i < 7; i++) {
                                weeks[i].setFont(font);
                        }
                }
        }

        /**
         * Sets the foregroundColor color.
         * 
         * @param foreground
         *            the new foregroundColor
         */
        public void setForeground(Color foreground) {
                super.setForeground(foreground);

                if (days != null) {
                        for (int i = 7; i < 49; i++) {
                                days[i].setForeground(foreground);
                        }

                        drawDays();
                }
        }

        /**
         * JDayChooser is the ActionListener for all day buttons.
         * 
         * @param e
         *            the ActionEvent
         */
        public void actionPerformed(ActionEvent e) {
                JButton button = (JButton) e.getSource();
                String buttonText = button.getText();
                int day = new Integer(buttonText).intValue();
                setDay(day);
        }

        /**
         * JDayChooser is the FocusListener for all day buttons. (Added by Thomas
         * Schaefer)
         * 
         * @param e
         *            the FocusEvent
         */
        /*
         * Code below commented out by Mark Brown on 24 Aug 2004. This code breaks
         * the JDateChooser code by triggering the actionPerformed method on the
         * next day button. This causes the date chosen to always be incremented by
         * one day.
         */
        public void focusGained(FocusEvent e) {
                // JButton button = (JButton) e.getSource();
                // String buttonText = button.getText();
                //
                // if ((buttonText != null) && !buttonText.equals("") &&
                // !e.isTemporary()) {
                // actionPerformed(new ActionEvent(e.getSource(), 0, null));
                // }
        }

        /**
         * Does nothing.
         * 
         * @param e
         *            the FocusEvent
         */
        public void focusLost(FocusEvent e) {
        }

        /**
         * JDayChooser is the KeyListener for all day buttons. (Added by Thomas
         * Schaefer and modified by Austin Moore)
         * 
         * @param e
         *            the KeyEvent
         */
        public void keyPressed(KeyEvent e) {
                int offset = (e.getKeyCode() == KeyEvent.VK_UP) ? (-7) : ((e
                                .getKeyCode() == KeyEvent.VK_DOWN) ? (+7)
                                : ((e.getKeyCode() == KeyEvent.VK_LEFT) ? (-1) : ((e
                                                .getKeyCode() == KeyEvent.VK_RIGHT) ? (+1) : 0)));

                int newDay = getDay() + offset;

                if ((newDay >= 1)
                                && (newDay <= calendar.getMaximum(Calendar.DAY_OF_MONTH))) {
                        setDay(newDay);
                }
        }

        /**
         * Does nothing.
         * 
         * @param e
         *            the KeyEvent
         */
        public void keyTyped(KeyEvent e) {
        }

        /**
         * Does nothing.
         * 
         * @param e
         *            the KeyEvent
         */
        public void keyReleased(KeyEvent e) {
        }

        /**
         * Enable or disable the JDayChooser.
         * 
         * @param enabled
         *            The new enabled value
         */
        public void setEnabled(boolean enabled) {
                super.setEnabled(enabled);

                for (short i = 0; i < days.length; i++) {
                        if (days[i] != null) {
                                days[i].setEnabled(enabled);
                        }
                }

                for (short i = 0; i < weeks.length; i++) {
                        if (weeks[i] != null) {
                                weeks[i].setEnabled(enabled);
                        }
                }
        }

        /**
         * In some Countries it is often usefull to know in which week of the year a
         * date is.
         * 
         * @return boolean true, if the weeks of the year is shown
         */
        public boolean isWeekOfYearVisible() {
                return weekOfYearVisible;
        }

        /**
         * In some Countries it is often usefull to know in which week of the year a
         * date is.
         * 
         * @param weekOfYearVisible
         *            true, if the weeks of the year shall be shown
         */
        public void setWeekOfYearVisible(boolean weekOfYearVisible) {
                if (weekOfYearVisible == this.weekOfYearVisible) {
                        return;
                } else if (weekOfYearVisible) {
                        add(weekPanel, BorderLayout.WEST);
                } else {
                        remove(weekPanel);
                }

                this.weekOfYearVisible = weekOfYearVisible;
                validate();
                dayPanel.validate();
        }

        /**
         * Returns the day panel.
         * 
         * @return the day panel
         */
        public JPanel getDayPanel() {
                return dayPanel;
        }

        /**
         * Returns the color of the decoration (day names and weeks).
         * 
         * @return the color of the decoration (day names and weeks).
         */
        public Color getDecorationBackgroundColor() {
                return decorationBackgroundColor;
        }

        /**
         * Sets the background of days and weeks of year buttons.
         * 
         * @param decorationBackgroundColor
         *            The background to set
         */
        public void setDecorationBackgroundColor(Color decorationBackgroundColor) {
                this.decorationBackgroundColor = decorationBackgroundColor;

                if (days != null) {
                        for (int i = 0; i < 7; i++) {
                                days[i].setBackground(decorationBackgroundColor);
                        }
                }

                if (weeks != null) {
                        for (int i = 0; i < 7; i++) {
                                weeks[i].setBackground(decorationBackgroundColor);
                        }
                }
        }

        /**
         * Returns the Sunday foreground.
         * 
         * @return Color the Sunday foreground.
         */
        public Color getSundayForeground() {
                return sundayForeground;
        }

        /**
         * Returns the weekday foreground.
         * 
         * @return Color the weekday foreground.
         */
        public Color getWeekdayForeground() {
                return weekdayForeground;
        }

        /**
         * Sets the Sunday foreground.
         * 
         * @param sundayForeground
         *            The sundayForeground to set
         */
        public void setSundayForeground(Color sundayForeground) {
                this.sundayForeground = sundayForeground;
                drawDayNames();
                drawDays();
        }

        /**
         * Sets the weekday foreground.
         * 
         * @param weekdayForeground
         *            The weekdayForeground to set
         */
        public void setWeekdayForeground(Color weekdayForeground) {
                this.weekdayForeground = weekdayForeground;
                drawDayNames();
                drawDays();
        }

        /**
         * Requests that the selected day also have the focus.
         */
        public void setFocus() {
                if (selectedDay != null) {
                        this.selectedDay.requestFocus();
                }
        }

        /**
         * The decoration background is the background color of the day titles and
         * the weeks of the year.
         * 
         * @return Returns true, if the decoration background is painted.
         */
        public boolean isDecorationBackgroundVisible() {
                return decorationBackgroundVisible;
        }

        /**
         * The decoration background is the background color of the day titles and
         * the weeks of the year.
         * 
         * @param decorationBackgroundVisible
         *            true, if the decoration background shall be painted.
         */
        public void setDecorationBackgroundVisible(
                        boolean decorationBackgroundVisible) {
                this.decorationBackgroundVisible = decorationBackgroundVisible;
                initDecorations();
        }

        /**
         * The decoration border is the button border of the day titles and the
         * weeks of the year.
         * 
         * @return Returns true, if the decoration border is painted.
         */
        public boolean isDecorationBordersVisible() {
                return decorationBordersVisible;
        }

        public boolean isDayBordersVisible() {
                return dayBordersVisible;
        }

        /**
         * The decoration border is the button border of the day titles and the
         * weeks of the year.
         * 
         * @param decorationBordersVisible
         *            true, if the decoration border shall be painted.
         */
        public void setDecorationBordersVisible(boolean decorationBordersVisible) {
                this.decorationBordersVisible = decorationBordersVisible;
                initDecorations();
        }

        public void setDayBordersVisible(boolean dayBordersVisible) {
                this.dayBordersVisible = dayBordersVisible;
                if (initialized) {
                        for (int x = 7; x < 49; x++) {
                                if ("Windows".equals(UIManager.getLookAndFeel().getID())) {
                                        days[x].setContentAreaFilled(dayBordersVisible);
                                } else {
                                        days[x].setContentAreaFilled(true);
                                }
                                days[x].setBorderPainted(dayBordersVisible);
                        }
                }
        }

        /**
         * Updates the UI and sets the day button preferences.
         */
        public void updateUI() {
                super.updateUI();
                setFont(Font.decode("Dialog Plain 11"));

                if (weekPanel != null) {
                        weekPanel.updateUI();
                }
                if (initialized) {
                        if ("Windows".equals(UIManager.getLookAndFeel().getID())) {
                                setDayBordersVisible(false);
                                setDecorationBackgroundVisible(true);
                                setDecorationBordersVisible(false);
                        } else {
                                setDayBordersVisible(true);
                                setDecorationBackgroundVisible(decorationBackgroundVisible);
                                setDecorationBordersVisible(decorationBordersVisible);
                        }
                }
        }

        /**
         * Sets a valid date range for selectable dates. If max is before min, the
         * default range with no limitation is set.
         * 
         * @param min
         *            the minimum selectable date or null (then the minimum date is
         *            set to 01\01\0001)
         * @param max
         *            the maximum selectable date or null (then the maximum date is
         *            set to 01\01\9999)
         */
        public void setSelectableDateRange(Date min, Date max) {
                if (min == null) {
                        minSelectableDate = defaultMinSelectableDate;
                } else {
                        minSelectableDate = min;
                }
                if (max == null) {
                        maxSelectableDate = defaultMaxSelectableDate;
                } else {
                        maxSelectableDate = max;
                }
                if (maxSelectableDate.before(minSelectableDate)) {
                        minSelectableDate = defaultMinSelectableDate;
                        maxSelectableDate = defaultMaxSelectableDate;
                }
                drawDays();
        }

        /**
         * Sets the maximum selectable date. If null, the date 01\01\9999 will be
         * set instead.
         * 
         * @param max
         *            the maximum selectable date
         * 
         * @return the maximum selectable date
         */
        public Date setMaxSelectableDate(Date max) {
                if (max == null) {
                        maxSelectableDate = defaultMaxSelectableDate;
                } else {
                        maxSelectableDate = max;
                }
                drawDays();
                return maxSelectableDate;
        }

        /**
         * Sets the minimum selectable date. If null, the date 01\01\0001 will be
         * set instead.
         * 
         * @param min
         *            the minimum selectable date
         * 
         * @return the minimum selectable date
         */
        public Date setMinSelectableDate(Date min) {
                if (min == null) {
                        minSelectableDate = defaultMinSelectableDate;
                } else {
                        minSelectableDate = min;
                }
                drawDays();
                return minSelectableDate;
        }

        /**
         * Gets the maximum selectable date.
         * 
         * @return the maximum selectable date
         */
        public Date getMaxSelectableDate() {
                return maxSelectableDate;
        }

        /**
         * Gets the minimum selectable date.
         * 
         * @return the minimum selectable date
         */
        public Date getMinSelectableDate() {
                return minSelectableDate;
        }

        /**
         * Gets the maximum number of characters of a day name or 0. If 0 is
         * returned, dateFormatSymbols.getShortWeekdays() will be used.
         * 
         * @return the maximum number of characters of a day name or 0.
         */
        public int getMaxDayCharacters() {
                return maxDayCharacters;
        }

        /**
         * Sets the maximum number of characters per day in the day bar. Valid
         * values are 0-4. If set to 0, dateFormatSymbols.getShortWeekdays() will be
         * used, otherwise theses strings will be reduced to the maximum number of
         * characters.
         * 
         * @param maxDayCharacters
         *            the maximum number of characters of a day name.
         */
        public void setMaxDayCharacters(int maxDayCharacters) {
                if (maxDayCharacters == this.maxDayCharacters) {
                        return;
                }

                if (maxDayCharacters < 0 || maxDayCharacters > 4) {
                        this.maxDayCharacters = 0;
                } else {
                        this.maxDayCharacters = maxDayCharacters;
                }
                drawDayNames();
                drawDays();
                invalidate();
        }

        /**
         * Creates a JFrame with a JDayChooser inside and can be used for testing.
         * 
         * @param s
         *            The command line arguments
         */
        public static void main(String[] s) {
                JFrame frame = new JFrame("JDayChooser");
                frame.getContentPane().add(new JDayChooser());
                frame.pack();
                frame.setVisible(true);
        }

        class DecoratorButton extends JButton {
                private static final long serialVersionUID = -5306477668406547496L;

                public DecoratorButton() {
                        setBackground(decorationBackgroundColor);
                        setContentAreaFilled(decorationBackgroundVisible);
                        setBorderPainted(decorationBordersVisible);
                }

                public void addMouseListener(MouseListener l) {
                }

                public boolean isFocusable() {
                        return false;
                }

                public void paint(Graphics g) {
                        if ("Windows".equals(UIManager.getLookAndFeel().getID())) {
                                // this is a hack to get the background painted
                                // when using Windows Look & Feel
                                if (decorationBackgroundVisible) {
                                        g.setColor(decorationBackgroundColor);
                                } else {
                                        g.setColor(days[7].getBackground());
                                }
                                g.fillRect(0, 0, getWidth(), getHeight());
                                if (isBorderPainted()) {
                                        setContentAreaFilled(true);
                                } else {
                                        setContentAreaFilled(false);
                                }
                        }
                        super.paint(g);
                }
        };
}