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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.netbeans.modules.bugtracking.tasks;

import java.awt.Point;
import java.awt.event.MouseEvent;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import javax.swing.JComponent;
import javax.swing.JFormattedTextField;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.text.DateFormatter;
import javax.swing.text.DefaultFormatterFactory;
import org.netbeans.modules.bugtracking.spi.IssueScheduleInfo;
import org.openide.util.ChangeSupport;
import org.openide.util.NbBundle;

/**
 * An implementation for {@link org.netbeans.modules.bugtracking.spi.SchedulingPicker }
 * @author Ondrej Vrabec
 */
public class SchedulingPickerImpl extends javax.swing.JPanel {

    private final ChangeSupport support;
    private IssueScheduleInfo currentValue;
    private static final DateFormat DATE_FORMAT = DateFormat.getDateInstance(DateFormat.MEDIUM);
    private boolean setting;
    
    /**
     * Creates new form SchedulePickerImpl
     */
    public SchedulingPickerImpl () {
        support = new ChangeSupport(this);
        initComponents();
    }
    
    public JComponent getComponent () {
        return this;
    }
    
    public IssueScheduleInfo getScheduleDate () {
        return currentValue;
    }
    
    public void setScheduleDate (IssueScheduleInfo info) {
        currentValue = info;
        setting = true;
        scheduleTextComponent.setValue(info);
        setting = false;
    }
    
    public void addChangeListener (ChangeListener listener) {
        support.addChangeListener(listener);
    }
        
    public void removeChangeListener (ChangeListener listener) {
        support.removeChangeListener(listener);
    }
    
    @Override
    public void setEnabled (boolean enabled) {
        super.setEnabled(enabled);
        scheduleTextComponent.setEnabled(enabled);
        popupButton.setEnabled(enabled);
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // //GEN-BEGIN:initComponents
    private void initComponents() {

        scheduleTextComponent = new javax.swing.JFormattedTextField();
        popupButton = new javax.swing.JButton();

        scheduleTextComponent.setFormatterFactory(new DefaultFormatterFactory(new SchedulingDisplayFormatter(), null, new SchedulingEditFormatter(), null));
        scheduleTextComponent.setMargin(new java.awt.Insets(2, 2, 2, 2));
        scheduleTextComponent.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
            public void propertyChange(java.beans.PropertyChangeEvent evt) {
                scheduleTextComponentPropertyChange(evt);
            }
        });

        popupButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("/org/netbeans/modules/bugtracking/tasks/resources/arrow-down.png"))); // NOI18N
        popupButton.setMargin(new java.awt.Insets(2, 2, 2, 2));
        popupButton.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mousePressed(java.awt.event.MouseEvent evt) {
                popupButtonMousePressed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(scheduleTextComponent, javax.swing.GroupLayout.PREFERRED_SIZE, 200, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, 0)
                .addComponent(popupButton)
                .addGap(0, 0, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
                    .addComponent(scheduleTextComponent, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(popupButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGap(0, 0, 0))
        );
    }// //GEN-END:initComponents

    private void popupButtonMousePressed(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_popupButtonMousePressed
        if (evt.getButton() == MouseEvent.BUTTON1) {
            showSchedulingPopup();
        }
    }//GEN-LAST:event_popupButtonMousePressed

    private void scheduleTextComponentPropertyChange(java.beans.PropertyChangeEvent evt) {//GEN-FIRST:event_scheduleTextComponentPropertyChange
        if ("value".equals(evt.getPropertyName())) { //NOI18N
            if (evt.getOldValue() != null || evt.getNewValue() != null) {
                updateCurrentValue((IssueScheduleInfo) scheduleTextComponent.getValue());
            }
        }
    }//GEN-LAST:event_scheduleTextComponentPropertyChange


    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton popupButton;
    private javax.swing.JFormattedTextField scheduleTextComponent;
    // End of variables declaration//GEN-END:variables

    private void updateCurrentValue (IssueScheduleInfo info) {
        if (!setting && (currentValue == null && info != null
                || currentValue != null && !currentValue.equals(info))) {
            currentValue = info;
            scheduleTextComponent.setValue(info);
            support.fireChange();
        }
    }
    
    private void showSchedulingPopup () {
        final DashboardUtils.SchedulingMenu menu = new DashboardUtils.SchedulingMenu(currentValue);
        menu.addChangeListener(new ChangeListener() {

            @Override
            public void stateChanged (ChangeEvent e) {
                updateCurrentValue(menu.getScheduleInfo());
                menu.removeChangeListener(this);
            }
        });
        JPopupMenu popup = new JPopupMenu();
        for (JMenuItem item : menu.getMenuItems()) {
            if (item == null) {
                popup.addSeparator();
            } else {
                popup.add(item);
            }
        }
        Point p = scheduleTextComponent.getLocation();
        popup.show(scheduleTextComponent.getParent(), p.x, p.y + scheduleTextComponent.getSize().height + 1);
    }

    @NbBundle.Messages({
        "# {0} - date from", "# {1} - date until", "CTL_SpecificDates={0} - {1}"
    })
    private static String toDisplayable (IssueScheduleInfo info) {
        Date date = info.getDate();
        int interval = info.getInterval();
        Calendar cal = Calendar.getInstance();
        stripTime(cal);
        Calendar scheduleDay = Calendar.getInstance();
        scheduleDay.setTime(date);
        stripTime(scheduleDay);
        
        if (interval <= 1) {
            String dayName = scheduleDay.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.getDefault());

            for (int i = 0; i < 7; ++i) {
                if (cal.getTime().equals(scheduleDay.getTime())) {
                    if (i == 0) {
                        dayName = Bundle.CTL_Today(dayName);
                    }
                    return dayName;
                }
                cal.add(Calendar.DATE, 1);
            }
            return DATE_FORMAT.format(date);
        } else {
            scheduleDay.setTime(date);
            stripTime(scheduleDay);
            Calendar until = Calendar.getInstance();
            until.setTime(date);
            stripTime(until);
            until.add(Calendar.DATE, interval);
            
            if (isThisWeek(scheduleDay, until)) {
                return Bundle.CTL_ThisWeek();
            } else if (isNextWeek(scheduleDay, until)) {
                return Bundle.CTL_NextWeek();
            } else {
                return Bundle.CTL_SpecificDates(DATE_FORMAT.format(scheduleDay.getTime()),
                        DATE_FORMAT.format(until.getTime()));
            }
        }
    }
    
    private static void stripTime (Calendar cal) {
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
    }

    private static boolean isThisWeek (Calendar scheduleDay, Calendar until) {
        Calendar weekStart = Calendar.getInstance();
        stripTime(weekStart);
        weekStart.set(Calendar.DAY_OF_WEEK, weekStart.getFirstDayOfWeek());
        Calendar weekEnd = Calendar.getInstance();
        weekEnd.setTime(weekStart.getTime());
        weekEnd.add(Calendar.DATE, 7);
        
        return scheduleDay.equals(weekStart) && until.equals(weekEnd);
    }

    private static boolean isNextWeek (Calendar scheduleDay, Calendar until) {
        Calendar weekStart = Calendar.getInstance();
        stripTime(weekStart);
        weekStart.set(Calendar.DAY_OF_WEEK, weekStart.getFirstDayOfWeek());
        weekStart.add(Calendar.DATE, 7);
        Calendar weekEnd = Calendar.getInstance();
        weekEnd.setTime(weekStart.getTime());
        weekEnd.add(Calendar.DATE, 7);
        
        return scheduleDay.equals(weekStart) && until.equals(weekEnd);
    }

    private static class SchedulingDisplayFormatter extends JFormattedTextField.AbstractFormatter {

        @Override
        public Object stringToValue (String text) throws ParseException {
            return null;
        }

        @Override
        public String valueToString (Object value) throws ParseException {
            if (value instanceof IssueScheduleInfo) {
                return toDisplayable((IssueScheduleInfo) value);
            } else {
                return Bundle.CTL_NotScheduled();
            }
        }
    }

    private static class SchedulingEditFormatter extends DateFormatter {

        @Override
        public Object stringToValue (String text) throws ParseException {
            if (text == null || text.isEmpty()) {
                return null;
            } else {
                Date date = (Date) super.stringToValue(text);
                return new IssueScheduleInfo(date);
            }
        }

        @Override
        public String valueToString (Object value) throws ParseException {
            if (value instanceof IssueScheduleInfo) {
                return super.valueToString(((IssueScheduleInfo) value).getDate());
            } else {
                return null;
            }
        }
    }
}