/* ===========================================================
 * 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.]
 *
 * -------------------
 * GanttChartTest.java
 * -------------------
 * (C) Copyright 2005-present, by David Gilbert.
 *
 * Original Author:  David Gilbert;
 * Contributor(s):   -;
 *
 */

package org.jfree.chart;

import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.util.Calendar;
import java.util.Date;

import org.jfree.chart.event.ChartChangeEvent;
import org.jfree.chart.event.ChartChangeListener;
import org.jfree.chart.labels.CategoryToolTipGenerator;
import org.jfree.chart.labels.StandardCategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.chart.urls.CategoryURLGenerator;
import org.jfree.chart.urls.StandardCategoryURLGenerator;
import org.jfree.data.category.IntervalCategoryDataset;
import org.jfree.data.gantt.Task;
import org.jfree.data.gantt.TaskSeries;
import org.jfree.data.gantt.TaskSeriesCollection;
import org.jfree.data.time.SimpleTimePeriod;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.BeforeEach;

import static org.junit.jupiter.api.Assertions.*;

/**
 * Some tests for a Gantt chart.
 */
public class GanttChartTest  {

    /** A chart. */
    private JFreeChart chart;

    /**
     * Common test setup.
     */
    @BeforeEach
    public void setUp() {
        this.chart = createGanttChart();
    }

    /**
     * Draws the chart with a {@code null} info object to make sure that
     * no exceptions are thrown (a problem that was occurring at one point).
     */
    @Test
    public void testDrawWithNullInfo() {
        try {
            BufferedImage image = new BufferedImage(200 , 100,
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D g2 = image.createGraphics();
            this.chart.draw(g2, new Rectangle2D.Double(0, 0, 200, 100), null,
                    null);
            g2.dispose();
        }
        catch (Exception e) {
            fail("There should be no exception.");
        }
    }

    /**
     * Draws the chart with a {@code null} info object to make sure that
     * no exceptions are thrown (a problem that was occurring at one point).
     */
    @Test
    public void testDrawWithNullInfo2() {
        JFreeChart chart = createGanttChart();
        CategoryPlot plot = (CategoryPlot) chart.getPlot();
        plot.setDataset(createDataset());
        /* BufferedImage img =*/ chart.createBufferedImage(300, 200, null);
        //FIXME we should really assert a value
    }

    /**
     * Replaces the chart's dataset and then checks that the new dataset is OK.
     */
    @Test
    public void testReplaceDataset() {
        LocalListener l = new LocalListener();
        this.chart.addChangeListener(l);
        CategoryPlot plot = (CategoryPlot) this.chart.getPlot();
        plot.setDataset(null);
        assertTrue(l.flag);
    }

    /**
     * Check that setting a tool tip generator for a series does override the
     * default generator.
     */
    @Test
    public void testSetSeriesToolTipGenerator() {
        CategoryPlot plot = (CategoryPlot) this.chart.getPlot();
        CategoryItemRenderer renderer = plot.getRenderer();
        StandardCategoryToolTipGenerator tt
                = new StandardCategoryToolTipGenerator();
        renderer.setSeriesToolTipGenerator(0, tt);
        CategoryToolTipGenerator tt2 = renderer.getToolTipGenerator(0, 0);
        assertSame(tt2, tt);
    }

    /**
     * Check that setting a URL generator for a series does override the
     * default generator.
     */
    @Test
    public void testSetSeriesURLGenerator() {
        CategoryPlot plot = (CategoryPlot) this.chart.getPlot();
        CategoryItemRenderer renderer = plot.getRenderer();
        StandardCategoryURLGenerator url1
                = new StandardCategoryURLGenerator();
        renderer.setSeriesItemURLGenerator(0, url1);
        CategoryURLGenerator url2 = renderer.getItemURLGenerator(0, 0);
        assertSame(url2, url1);
    }

    /**
     * Create a Gantt chart.
     *
     * @return The chart.
     */
    private static JFreeChart createGanttChart() {

        return ChartFactory.createGanttChart(
            "Gantt Chart",
            "Domain", "Range",
            null,
            true,     // include legend
            true,
            true
        );
    }

    /**
     * Creates a sample dataset for a Gantt chart.
     *
     * @return The dataset.
     */
    public static IntervalCategoryDataset createDataset() {

        TaskSeries s1 = new TaskSeries("Scheduled");
        s1.add(new Task("Write Proposal",
               new SimpleTimePeriod(date(1, Calendar.APRIL, 2001),
                                    date(5, Calendar.APRIL, 2001))));
        s1.add(new Task("Obtain Approval",
               new SimpleTimePeriod(date(9, Calendar.APRIL, 2001),
                                    date(9, Calendar.APRIL, 2001))));
        s1.add(new Task("Requirements Analysis",
               new SimpleTimePeriod(date(10, Calendar.APRIL, 2001),
                                    date(5, Calendar.MAY, 2001))));
        s1.add(new Task("Design Phase",
               new SimpleTimePeriod(date(6, Calendar.MAY, 2001),
                                    date(30, Calendar.MAY, 2001))));
        s1.add(new Task("Design Signoff",
               new SimpleTimePeriod(date(2, Calendar.JUNE, 2001),
                                    date(2, Calendar.JUNE, 2001))));
        s1.add(new Task("Alpha Implementation",
               new SimpleTimePeriod(date(3, Calendar.JUNE, 2001),
                                    date(31, Calendar.JULY, 2001))));
        s1.add(new Task("Design Review",
               new SimpleTimePeriod(date(1, Calendar.AUGUST, 2001),
                                    date(8, Calendar.AUGUST, 2001))));
        s1.add(new Task("Revised Design Signoff",
               new SimpleTimePeriod(date(10, Calendar.AUGUST, 2001),
                                    date(10, Calendar.AUGUST, 2001))));
        s1.add(new Task("Beta Implementation",
               new SimpleTimePeriod(date(12, Calendar.AUGUST, 2001),
                                    date(12, Calendar.SEPTEMBER, 2001))));
        s1.add(new Task("Testing",
               new SimpleTimePeriod(date(13, Calendar.SEPTEMBER, 2001),
                                    date(31, Calendar.OCTOBER, 2001))));
        s1.add(new Task("Final Implementation",
               new SimpleTimePeriod(date(1, Calendar.NOVEMBER, 2001),
                                    date(15, Calendar.NOVEMBER, 2001))));
        s1.add(new Task("Signoff",
               new SimpleTimePeriod(date(28, Calendar.NOVEMBER, 2001),
                                    date(30, Calendar.NOVEMBER, 2001))));

        TaskSeries s2 = new TaskSeries("Actual");
        s2.add(new Task("Write Proposal",
               new SimpleTimePeriod(date(1, Calendar.APRIL, 2001),
                                    date(5, Calendar.APRIL, 2001))));
        s2.add(new Task("Obtain Approval",
               new SimpleTimePeriod(date(9, Calendar.APRIL, 2001),
                                    date(9, Calendar.APRIL, 2001))));
        s2.add(new Task("Requirements Analysis",
               new SimpleTimePeriod(date(10, Calendar.APRIL, 2001),
                                    date(15, Calendar.MAY, 2001))));
        s2.add(new Task("Design Phase",
               new SimpleTimePeriod(date(15, Calendar.MAY, 2001),
                                    date(17, Calendar.JUNE, 2001))));
        s2.add(new Task("Design Signoff",
               new SimpleTimePeriod(date(30, Calendar.JUNE, 2001),
                                    date(30, Calendar.JUNE, 2001))));
        s2.add(new Task("Alpha Implementation",
               new SimpleTimePeriod(date(1, Calendar.JULY, 2001),
                                    date(12, Calendar.SEPTEMBER, 2001))));
        s2.add(new Task("Design Review",
               new SimpleTimePeriod(date(12, Calendar.SEPTEMBER, 2001),
                                    date(22, Calendar.SEPTEMBER, 2001))));
        s2.add(new Task("Revised Design Signoff",
               new SimpleTimePeriod(date(25, Calendar.SEPTEMBER, 2001),
                                    date(27, Calendar.SEPTEMBER, 2001))));
        s2.add(new Task("Beta Implementation",
               new SimpleTimePeriod(date(27, Calendar.SEPTEMBER, 2001),
                                    date(30, Calendar.OCTOBER, 2001))));
        s2.add(new Task("Testing",
               new SimpleTimePeriod(date(31, Calendar.OCTOBER, 2001),
                                    date(17, Calendar.NOVEMBER, 2001))));
        s2.add(new Task("Final Implementation",
               new SimpleTimePeriod(date(18, Calendar.NOVEMBER, 2001),
                                    date(5, Calendar.DECEMBER, 2001))));
        s2.add(new Task("Signoff",
               new SimpleTimePeriod(date(10, Calendar.DECEMBER, 2001),
                                    date(11, Calendar.DECEMBER, 2001))));

        TaskSeriesCollection collection = new TaskSeriesCollection();
        collection.add(s1);
        collection.add(s2);

        return collection;
    }

    /**
     * Utility method for creating {@code Date} objects.
     *
     * @param day  the date.
     * @param month  the month.
     * @param year  the year.
     *
     * @return a date.
     */
    private static Date date(int day, int month, int year) {

        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month, day);
        Date result = calendar.getTime();
        return result;

    }    /**
     * A chart change listener.
     *
     */
    static class LocalListener implements ChartChangeListener {

        /** A flag. */
        private boolean flag;

        /**
         * Event handler.
         *
         * @param event  the event.
         */
        @Override
        public void chartChanged(ChartChangeEvent event) {
            this.flag = true;
        }

    }

}
