/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-present, by David Gilbert and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
 * Other names may be trademarks of their respective owners.]
 *
 * ----------------------
 * DefaultPolarPlotEditor.java
 * ----------------------
 * (C) Copyright 2005-present, by David Gilbert and Contributors.
 *
 * Original Author:  Martin Hoeller;
 * Contributor(s):   -;
 *
 */


package org.jfree.chart.editor;

import java.awt.event.ActionEvent;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;

import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;

import org.jfree.chart.axis.NumberTickUnit;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PolarPlot;
import org.jfree.chart.ui.LCBLayout;

/**
 * A panel for editing the properties of a {@link PolarPlot}.
 */
public class DefaultPolarPlotEditor extends DefaultPlotEditor
    implements FocusListener {

    /** A text field to enter a manual TickUnit. */
    private JTextField manualTickUnit;

    /** A text field to enter the angleOffset. */
    private JTextField angleOffset;

    /** The size for the manual TickUnit. */
    private double manualTickUnitValue;

    /** The value for the plot's angle offset. */
    private double angleOffsetValue;

    
    /**
     * Standard constructor - constructs a panel for editing the properties of
     * the specified plot.
     *
     * @param plot  the plot, which should be changed.
     */
    public DefaultPolarPlotEditor(PolarPlot plot) {
        super(plot);
        this.angleOffsetValue = plot.getAngleOffset();
        this.angleOffset.setText(Double.toString(this.angleOffsetValue));
        this.manualTickUnitValue = plot.getAngleTickUnit().getSize();
        this.manualTickUnit.setText(Double.toString(this.manualTickUnitValue));
    }

    /**
     * Creates a tabbed pane for editing the plot attributes.
     * 
     * @param plot  the plot.
     * 
     * @return A tabbed pane. 
     */
    @Override
    protected JTabbedPane createPlotTabs(Plot plot) {
        JTabbedPane tabs = super.createPlotTabs(plot);
        // TODO find a better localization key
        tabs.insertTab(localizationResources.getString("General1"), null, 
                createPlotPanel(), null, 0);
        tabs.setSelectedIndex(0);
        return tabs;
    }

    private JPanel createPlotPanel() {
        JPanel plotPanel = new JPanel(new LCBLayout(3));
        plotPanel.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4));

        plotPanel.add(new JLabel(localizationResources.getString(
                "AngleOffset")));
        this.angleOffset = new JTextField(Double.toString(
                this.angleOffsetValue));
        this.angleOffset.setActionCommand("AngleOffsetValue");
        this.angleOffset.addActionListener(this);
        this.angleOffset.addFocusListener(this);
        plotPanel.add(this.angleOffset);
        plotPanel.add(new JPanel());

        plotPanel.add(new JLabel(localizationResources.getString(
                "Manual_TickUnit_value")));
        this.manualTickUnit = new JTextField(Double.toString(
                this.manualTickUnitValue));
        this.manualTickUnit.setActionCommand("TickUnitValue");
        this.manualTickUnit.addActionListener(this);
        this.manualTickUnit.addFocusListener(this);
        plotPanel.add(this.manualTickUnit);
        plotPanel.add(new JPanel());

        return plotPanel;
    }

    /**
     * Does nothing.
     *
     * @param event  the event.
     */
    @Override
    public void focusGained(FocusEvent event) {
        // don't need to do anything
    }

    /**
     *  Revalidates minimum/maximum range.
     *
     *  @param event  the event.
     */
    @Override
    public void focusLost(FocusEvent event) {
        if (event.getSource() == this.angleOffset) {
            validateAngleOffset();
        }
        else if (event.getSource() == this.manualTickUnit) {
            validateTickUnit();
        }
    }

    /**
     * Handles actions from within the property panel.
     * @param event an event.
     */
    @Override
    public void actionPerformed(ActionEvent event) {
        String command = event.getActionCommand();
        if (command.equals("AngleOffsetValue")) {
            validateAngleOffset();
        }
        else if (command.equals("TickUnitValue")) {
            validateTickUnit();
        }
    }

    /**
     * Validates the angle offset entered by the user.
     */
    public void validateAngleOffset() {
        double newOffset;
        try {
            newOffset = Double.parseDouble(this.angleOffset.getText());
        }
        catch (NumberFormatException e) {
            newOffset = this.angleOffsetValue;
        }
        this.angleOffsetValue = newOffset;
        this.angleOffset.setText(Double.toString(this.angleOffsetValue));
    }

    /**
     * Validates the tick unit entered by the user.
     */
    public void validateTickUnit() {
        double newTickUnit;
        try {
            newTickUnit = Double.parseDouble(this.manualTickUnit.getText());
        }
        catch (NumberFormatException e) {
            newTickUnit = this.manualTickUnitValue;
        }

        if (newTickUnit > 0.0 && newTickUnit < 360.0) {
            this.manualTickUnitValue = newTickUnit;
        }
        this.manualTickUnit.setText(Double.toString(this.manualTickUnitValue));
    }

    @Override
    public void updatePlotProperties(Plot plot) {
        super.updatePlotProperties(plot);
        PolarPlot pp = (PolarPlot) plot;
        pp.setAngleTickUnit(new NumberTickUnit(this.manualTickUnitValue));
        pp.setAngleOffset(this.angleOffsetValue);
    }
}
