/**
    * Copyright 2004 Juan Heyns. All rights reserved.
    * <p/>
    * Redistribution and use in source and binary forms, with or without modification, are
    * permitted provided that the following conditions are met:
    * <p/>
    * 1. Redistributions of source code must retain the above copyright notice, this list of
    * conditions and the following disclaimer.
    * <p/>
   * 2. Redistributions in binary form must reproduce the above copyright notice, this list
   * of conditions and the following disclaimer in the documentation and/or other materials
   * provided with the distribution.
   * <p/>
   * THIS SOFTWARE IS PROVIDED BY JUAN HEYNS ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JUAN HEYNS OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
   * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   * <p/>
   * The views and conclusions contained in the software and documentation are those of the
   * authors and should not be interpreted as representing official policies, either expressed
   * or implied, of Juan Heyns.
   */
  package fr.ifremer.quadrige3.ui.swing.component.date;
  
  /*
   * #%L
   * Reef DB :: UI
   * $Id:$
   * $HeadURL:$
   * %%
   * Copyright (C) 2014 - 2015 Ifremer
   * %%
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero 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 Affero General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   * #L%
   */
  
  
  import javax.swing.event.ChangeEvent;
  import javax.swing.event.ChangeListener;
  import java.beans.PropertyChangeEvent;
  import java.beans.PropertyChangeListener;
  import java.util.Calendar;
  import java.util.Date;
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * Created 18 April 2010
   * Updated 26 April 2010
   *
   * @author Juan Heyns
   */
  public class DateModel {
  
      /** Constant <code>PROPERTY_YEAR="year"</code> */
      public static final String PROPERTY_YEAR = "year";
      /** Constant <code>PROPERTY_MONTH="month"</code> */
      public static final String PROPERTY_MONTH = "month";
      /** Constant <code>PROPERTY_DAY="day"</code> */
      public static final String PROPERTY_DAY = "day";
      /** Constant <code>PROPERTY_VALUE="value"</code> */
      public static final String PROPERTY_VALUE = "value";
      /** Constant <code>PROPERTY_SELECTED="selected"</code> */
      public static final String PROPERTY_SELECTED = "selected";
  
      private boolean modelAdjusting;
      private boolean selected;
      private Date date;
      private Calendar calendarValue;
      private final Set<ChangeListener> changeListeners;
      private final Set<PropertyChangeListener> propertyChangeListeners;
  
      /**
       * <p>Constructor for DateModel.</p>
       *
       * @param dateValue a {@link java.util.Date} object.
       */
      public DateModel(Date dateValue) {
          this();
          setDate(dateValue);
      }
  
      /**
      * <p>Constructor for DateModel.</p>
      *
      * @param calendarValue a {@link java.util.Calendar} object.
      */
     public DateModel(Calendar calendarValue) {
         this();
         setDate(fromCalendar(calendarValue));
     }
 
     /**
      * <p>Constructor for DateModel.</p>
      */
     public DateModel() {
         changeListeners = new HashSet<>();
         propertyChangeListeners = new HashSet<>();
         selected = false;
         calendarValue = Calendar.getInstance();
     }
 
     /**
      * <p>addChangeListener.</p>
      *
      * @param changeListener a {@link javax.swing.event.ChangeListener} object.
      */
     public synchronized void addChangeListener(ChangeListener changeListener) {
         changeListeners.add(changeListener);
     }
 
     /**
      * <p>removeChangeListener.</p>
      *
      * @param changeListener a {@link javax.swing.event.ChangeListener} object.
      */
     public synchronized void removeChangeListener(ChangeListener changeListener) {
         changeListeners.remove(changeListener);
     }
 
     /**
      * <p>fireChangeEvent.</p>
      */
     protected synchronized void fireChangeEvent() {
         if (modelAdjusting) {
             return;
         }
         modelAdjusting = true;
         for (ChangeListener changeListener : changeListeners) {
             changeListener.stateChanged(new ChangeEvent(this));
         }
         modelAdjusting = false;
     }
 
     /**
      * <p>addPropertyChangeListener.</p>
      *
      * @param listener a {@link java.beans.PropertyChangeListener} object.
      */
     public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
         propertyChangeListeners.add(listener);
     }
 
     /**
      * <p>removePropertyChangeListener.</p>
      *
      * @param listener a {@link java.beans.PropertyChangeListener} object.
      */
     public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
         propertyChangeListeners.remove(listener);
     }
 
     /**
      * <p>firePropertyChange.</p>
      *
      * @param propertyName a {@link java.lang.String} object.
      * @param oldValue a {@link java.lang.Object} object.
      * @param newValue a {@link java.lang.Object} object.
      */
     protected synchronized void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
         if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
             return;
         }
 
         for (PropertyChangeListener listener : propertyChangeListeners) {
             listener.propertyChange(new PropertyChangeEvent(this, propertyName, oldValue, newValue));
         }
     }
 
     /**
      * <p>getDay.</p>
      *
      * @return a int.
      */
     public int getDay() {
         return calendarValue.get(Calendar.DATE);
     }
 
     /**
      * <p>getMonth.</p>
      *
      * @return a int.
      */
     public int getMonth() {
         return calendarValue.get(Calendar.MONTH);
     }
 
     /**
      * <p>getYear.</p>
      *
      * @return a int.
      */
     public int getYear() {
         return calendarValue.get(Calendar.YEAR);
     }
 
     /**
      * <p>Getter for the field <code>date</code>.</p>
      *
      * @return a {@link java.util.Date} object.
      */
     public Date getDate() {
         if (!selected) {
             return null;
         }
         return date;
     }
 
     /**
      * <p>setDay.</p>
      *
      * @param day a int.
      */
     public void setDay(int day) {
         int oldDayValue = this.calendarValue.get(Calendar.DATE);
         calendarValue.set(Calendar.DATE, day);
         fireChangeEvent();
         firePropertyChange(PROPERTY_DAY, oldDayValue, this.calendarValue.get(Calendar.DATE));
         updateDateFromCalendar();
     }
 
     /**
      * <p>addDay.</p>
      *
      * @param add a int.
      */
     public void addDay(int add) {
         int oldDayValue = this.calendarValue.get(Calendar.DATE);
         calendarValue.add(Calendar.DATE, add);
         fireChangeEvent();
         firePropertyChange(PROPERTY_DAY, oldDayValue, this.calendarValue.get(Calendar.DATE));
     }
 
     /**
      * <p>setMonth.</p>
      *
      * @param month a int.
      */
     public void setMonth(int month) {
         int oldYearValue = this.calendarValue.get(Calendar.YEAR);
         int oldMonthValue = this.calendarValue.get(Calendar.MONTH);
         int oldDayValue = this.calendarValue.get(Calendar.DAY_OF_MONTH);
 
         Calendar newVal = Calendar.getInstance();
         newVal.set(Calendar.DAY_OF_MONTH, 1);
         newVal.set(Calendar.MONTH, month);
         newVal.set(Calendar.YEAR, oldYearValue);
 
         if (newVal.getActualMaximum(Calendar.DAY_OF_MONTH) <= oldDayValue) {
             newVal.set(Calendar.DAY_OF_MONTH,
                     newVal.getActualMaximum(Calendar.DAY_OF_MONTH));
         } else {
             newVal.set(Calendar.DAY_OF_MONTH, oldDayValue);
         }
 
         calendarValue.set(Calendar.MONTH, newVal.get(Calendar.MONTH));
         calendarValue.set(Calendar.DAY_OF_MONTH, newVal.get(Calendar.DAY_OF_MONTH));
 
         fireChangeEvent();
         firePropertyChange(PROPERTY_MONTH, oldMonthValue, this.calendarValue.get(Calendar.MONTH));
         // only fire change event when day actually changed
         if (this.calendarValue.get(Calendar.DAY_OF_MONTH) != oldDayValue) {
             firePropertyChange(PROPERTY_DAY, oldDayValue,
                     this.calendarValue.get(Calendar.DAY_OF_MONTH));
         }
     }
 
     /**
      * <p>addMonth.</p>
      *
      * @param add a int.
      */
     public void addMonth(int add) {
         int oldMonthValue = this.calendarValue.get(Calendar.MONTH);
         calendarValue.add(Calendar.MONTH, add);
         fireChangeEvent();
         firePropertyChange(PROPERTY_MONTH, oldMonthValue, this.calendarValue.get(Calendar.MONTH));
     }
 
     /**
      * <p>setYear.</p>
      *
      * @param year a int.
      */
     public void setYear(int year) {
         int oldYearValue = this.calendarValue.get(Calendar.YEAR);
         int oldMonthValue = this.calendarValue.get(Calendar.MONTH);
         int oldDayValue = this.calendarValue.get(Calendar.DAY_OF_MONTH);
 
         Calendar newVal = Calendar.getInstance();
         newVal.set(Calendar.DAY_OF_MONTH, 1);
         newVal.set(Calendar.MONTH, oldMonthValue);
         newVal.set(Calendar.YEAR, year);
 
         if (newVal.getActualMaximum(Calendar.DAY_OF_MONTH) <= oldDayValue) {
             newVal.set(Calendar.DAY_OF_MONTH,
                     newVal.getActualMaximum(Calendar.DAY_OF_MONTH));
         } else {
             newVal.set(Calendar.DAY_OF_MONTH, oldDayValue);
         }
 
         calendarValue.set(Calendar.YEAR, newVal.get(Calendar.YEAR));
         calendarValue.set(Calendar.DAY_OF_MONTH, newVal.get(Calendar.DAY_OF_MONTH));
 
         fireChangeEvent();
         firePropertyChange(PROPERTY_YEAR, oldYearValue, this.calendarValue.get(Calendar.YEAR));
         // only fire change event when day actually changed
         if (this.calendarValue.get(Calendar.DAY_OF_MONTH) != oldDayValue) {
             firePropertyChange(PROPERTY_DAY, oldDayValue,
                     this.calendarValue.get(Calendar.DAY_OF_MONTH));
         }
     }
 
     /**
      * <p>addYear.</p>
      *
      * @param add a int.
      */
     public void addYear(int add) {
         int oldYearValue = this.calendarValue.get(Calendar.YEAR);
         calendarValue.add(Calendar.YEAR, add);
         fireChangeEvent();
         firePropertyChange(PROPERTY_YEAR, oldYearValue, this.calendarValue.get(Calendar.YEAR));
     }
 
     /**
      * <p>Setter for the field <code>date</code>.</p>
      *
      * @param value a {@link java.util.Date} object.
      */
     public void setDate(Date value) {
         int oldYearValue = this.calendarValue.get(Calendar.YEAR);
         int oldMonthValue = this.calendarValue.get(Calendar.MONTH);
         int oldDayValue = this.calendarValue.get(Calendar.DATE);
         boolean oldSelectedValue = isSelected();
 
         selected = value != null;
 
         if (value == null) {
             value = new Date();
         }
 
         this.calendarValue = toCalendar(value);
         setToMidnight();
 
         fireChangeEvent();
         firePropertyChange(PROPERTY_YEAR, oldYearValue, this.calendarValue.get(Calendar.YEAR));
         firePropertyChange(PROPERTY_MONTH, oldMonthValue, this.calendarValue.get(Calendar.MONTH));
         firePropertyChange(PROPERTY_DAY, oldDayValue, this.calendarValue.get(Calendar.DATE));
         updateDateFromCalendar();
         firePropertyChange(PROPERTY_SELECTED, oldSelectedValue, this.selected);
     }
 
     /**
      * <p>Setter for the field <code>date</code>.</p>
      *
      * @param year a int.
      * @param month a int.
      * @param day a int.
      */
     public void setDate(int year, int month, int day) {
         int oldYearValue = this.calendarValue.get(Calendar.YEAR);
         int oldMonthValue = this.calendarValue.get(Calendar.MONTH);
         int oldDayValue = this.calendarValue.get(Calendar.DATE);
         calendarValue.set(year, month, day);
         fireChangeEvent();
         firePropertyChange(PROPERTY_YEAR, oldYearValue, this.calendarValue.get(Calendar.YEAR));
         firePropertyChange(PROPERTY_MONTH, oldMonthValue, this.calendarValue.get(Calendar.MONTH));
         firePropertyChange(PROPERTY_DAY, oldDayValue, this.calendarValue.get(Calendar.DATE));
         updateDateFromCalendar();
     }
 
     private void updateDateFromCalendar() {
         date = fromCalendar(calendarValue);
         firePropertyChange(PROPERTY_VALUE, null, date);
     }
 
     /**
      * <p>isSelected.</p>
      *
      * @return a boolean.
      */
     public boolean isSelected() {
         return selected;
     }
 
     /**
      * <p>Setter for the field <code>selected</code>.</p>
      *
      * @param selected a boolean.
      */
     public void setSelected(boolean selected) {
         boolean oldSelectedValue = isSelected();
         this.selected = selected;
         fireChangeEvent();
         updateDateFromCalendar();
         firePropertyChange(PROPERTY_SELECTED, oldSelectedValue, this.selected);
     }
 
     private void setToMidnight() {
         calendarValue.set(Calendar.HOUR_OF_DAY, 0);
         calendarValue.set(Calendar.MINUTE, 0);
         calendarValue.set(Calendar.SECOND, 0);
         calendarValue.set(Calendar.MILLISECOND, 0);
     }
 
     private Calendar toCalendar(Date from) {
         Calendar to = Calendar.getInstance();
         to.setTime(from);
         return to;
     }
 
     private Date fromCalendar(Calendar from) {
         return new Date(from.getTimeInMillis());
     }
 
 }