/* ===========================================================
 * 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.]
 *
 * ------------------
 * GanttRenderer.java
 * ------------------
 * (C) Copyright 2003-present, by David Gilbert.
 *
 * Original Author:  David Gilbert;
 * Contributor(s):   -;
 * 
 */

package org.jfree.chart.renderer.category;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.ui.RectangleEdge;
import org.jfree.chart.util.PaintUtils;
import org.jfree.chart.util.Args;
import org.jfree.chart.util.SerialUtils;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.gantt.GanttCategoryDataset;

/**
 * A renderer for simple Gantt charts.  The example shown
 * here is generated by the {@code GanttDemo1.java} program
 * included in the JFreeChart Demo Collection:
 * <br><br>
 * <img src="doc-files/GanttRendererSample.png" alt="GanttRendererSample.png">
 */
public class GanttRenderer extends IntervalBarRenderer implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -4010349116350119512L;

    /** The paint for displaying the percentage complete. */
    private transient Paint completePaint;

    /** The paint for displaying the incomplete part of a task. */
    private transient Paint incompletePaint;

    /**
     * Controls the starting edge of the progress indicator (expressed as a
     * percentage of the overall bar width).
     */
    private double startPercent;

    /**
     * Controls the ending edge of the progress indicator (expressed as a
     * percentage of the overall bar width).
     */
    private double endPercent;

    /**
     * Creates a new renderer.
     */
    public GanttRenderer() {
        super();
        setIncludeBaseInRange(false);
        this.completePaint = Color.GREEN;
        this.incompletePaint = Color.RED;
        this.startPercent = 0.35;
        this.endPercent = 0.65;
    }

    /**
     * Returns the paint used to show the percentage complete.
     *
     * @return The paint (never {@code null}).
     *
     * @see #setCompletePaint(Paint)
     */
    public Paint getCompletePaint() {
        return this.completePaint;
    }

    /**
     * Sets the paint used to show the percentage complete and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param paint  the paint ({@code null} not permitted).
     *
     * @see #getCompletePaint()
     */
    public void setCompletePaint(Paint paint) {
        Args.nullNotPermitted(paint, "paint");
        this.completePaint = paint;
        fireChangeEvent();
    }

    /**
     * Returns the paint used to show the percentage incomplete.
     *
     * @return The paint (never {@code null}).
     *
     * @see #setCompletePaint(Paint)
     */
    public Paint getIncompletePaint() {
        return this.incompletePaint;
    }

    /**
     * Sets the paint used to show the percentage incomplete and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param paint  the paint ({@code null} not permitted).
     *
     * @see #getIncompletePaint()
     */
    public void setIncompletePaint(Paint paint) {
        Args.nullNotPermitted(paint, "paint");
        this.incompletePaint = paint;
        fireChangeEvent();
    }

    /**
     * Returns the position of the start of the progress indicator, as a
     * percentage of the bar width.
     *
     * @return The start percent.
     *
     * @see #setStartPercent(double)
     */
    public double getStartPercent() {
        return this.startPercent;
    }

    /**
     * Sets the position of the start of the progress indicator, as a
     * percentage of the bar width, and sends a {@link RendererChangeEvent} to
     * all registered listeners.
     *
     * @param percent  the percent.
     *
     * @see #getStartPercent()
     */
    public void setStartPercent(double percent) {
        this.startPercent = percent;
        fireChangeEvent();
    }

    /**
     * Returns the position of the end of the progress indicator, as a
     * percentage of the bar width.
     *
     * @return The end percent.
     *
     * @see #setEndPercent(double)
     */
    public double getEndPercent() {
        return this.endPercent;
    }

    /**
     * Sets the position of the end of the progress indicator, as a percentage
     * of the bar width, and sends a {@link RendererChangeEvent} to all
     * registered listeners.
     *
     * @param percent  the percent.
     *
     * @see #getEndPercent()
     */
    public void setEndPercent(double percent) {
        this.endPercent = percent;
        fireChangeEvent();
    }

    /**
     * Draws the bar for a single (series, category) data item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the data area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * @param pass  the pass index.
     */
    @Override
    public void drawItem(Graphics2D g2, CategoryItemRendererState state,
            Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis,
            ValueAxis rangeAxis, CategoryDataset dataset, int row,
            int column, int pass) {

         if (dataset instanceof GanttCategoryDataset) {
             GanttCategoryDataset gcd = (GanttCategoryDataset) dataset;
             drawTasks(g2, state, dataArea, plot, domainAxis, rangeAxis, gcd,
                     row, column);
         }
         else {  // let the superclass handle it...
             super.drawItem(g2, state, dataArea, plot, domainAxis, rangeAxis,
                     dataset, row, column, pass);
         }

     }

    /**
     * Draws the tasks/subtasks for one item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the data plot area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the data.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    protected void drawTasks(Graphics2D g2,
                             CategoryItemRendererState state,
                             Rectangle2D dataArea,
                             CategoryPlot plot,
                             CategoryAxis domainAxis,
                             ValueAxis rangeAxis,
                             GanttCategoryDataset dataset,
                             int row,
                             int column) {

        int count = dataset.getSubIntervalCount(row, column);
        if (count == 0) {
            drawTask(g2, state, dataArea, plot, domainAxis, rangeAxis,
                    dataset, row, column);
        }

        PlotOrientation orientation = plot.getOrientation();
        for (int subinterval = 0; subinterval < count; subinterval++) {

            RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();

            // value 0
            Number value0 = dataset.getStartValue(row, column, subinterval);
            if (value0 == null) {
                return;
            }
            double translatedValue0 = rangeAxis.valueToJava2D(
                    value0.doubleValue(), dataArea, rangeAxisLocation);

            // value 1
            Number value1 = dataset.getEndValue(row, column, subinterval);
            if (value1 == null) {
                return;
            }
            double translatedValue1 = rangeAxis.valueToJava2D(
                    value1.doubleValue(), dataArea, rangeAxisLocation);

            if (translatedValue1 < translatedValue0) {
                double temp = translatedValue1;
                translatedValue1 = translatedValue0;
                translatedValue0 = temp;
            }

            double rectStart = calculateBarW0(plot, plot.getOrientation(),
                    dataArea, domainAxis, state, row, column);
            double rectLength = Math.abs(translatedValue1 - translatedValue0);
            double rectBreadth = state.getBarWidth();

            // DRAW THE BARS...
            Rectangle2D bar = null;
            RectangleEdge barBase = null;
            if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                bar = new Rectangle2D.Double(translatedValue0, rectStart,
                        rectLength, rectBreadth);
                barBase = RectangleEdge.LEFT;
            }
            else if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                bar = new Rectangle2D.Double(rectStart, translatedValue0,
                        rectBreadth, rectLength);
                barBase = RectangleEdge.BOTTOM;
            }

            Rectangle2D completeBar = null;
            Rectangle2D incompleteBar = null;
            Number percent = dataset.getPercentComplete(row, column,
                    subinterval);
            double start = getStartPercent();
            double end = getEndPercent();
            if (percent != null) {
                double p = percent.doubleValue();
                if (orientation == PlotOrientation.HORIZONTAL) {
                    completeBar = new Rectangle2D.Double(translatedValue0,
                            rectStart + start * rectBreadth, rectLength * p,
                            rectBreadth * (end - start));
                    incompleteBar = new Rectangle2D.Double(translatedValue0
                            + rectLength * p, rectStart + start * rectBreadth,
                            rectLength * (1 - p), rectBreadth * (end - start));
                }
                else if (orientation == PlotOrientation.VERTICAL) {
                    completeBar = new Rectangle2D.Double(rectStart + start
                            * rectBreadth, translatedValue0 + rectLength
                            * (1 - p), rectBreadth * (end - start),
                            rectLength * p);
                    incompleteBar = new Rectangle2D.Double(rectStart + start
                            * rectBreadth, translatedValue0, rectBreadth
                            * (end - start), rectLength * (1 - p));
                }

            }

            if (getShadowsVisible()) {
                getBarPainter().paintBarShadow(g2, this, row, column, bar,
                        barBase, true);
            }
            getBarPainter().paintBar(g2, this, row, column, bar, barBase);

            if (completeBar != null) {
                g2.setPaint(getCompletePaint());
                g2.fill(completeBar);
            }
            if (incompleteBar != null) {
                g2.setPaint(getIncompletePaint());
                g2.fill(incompleteBar);
            }
            if (isDrawBarOutline()
                    && state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
                g2.setStroke(getItemStroke(row, column));
                g2.setPaint(getItemOutlinePaint(row, column));
                g2.draw(bar);
            }

            if (subinterval == count - 1) {
                // submit the current data point as a crosshair candidate
                int datasetIndex = plot.indexOf(dataset);
                Comparable columnKey = dataset.getColumnKey(column);
                Comparable rowKey = dataset.getRowKey(row);
                double xx = domainAxis.getCategorySeriesMiddle(columnKey,
                        rowKey, dataset, getItemMargin(), dataArea,
                        plot.getDomainAxisEdge());
                updateCrosshairValues(state.getCrosshairState(),
                        dataset.getRowKey(row), dataset.getColumnKey(column),
                        value1.doubleValue(), datasetIndex, xx,
                        translatedValue1, orientation);

            }
            // collect entity and tool tip information...
            if (state.getInfo() != null) {
                EntityCollection entities = state.getEntityCollection();
                if (entities != null) {
                    addItemEntity(entities, dataset, row, column, bar);
                }
            }
        }
    }

    /**
     * Draws a single task.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the data plot area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the data.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    protected void drawTask(Graphics2D g2,
                            CategoryItemRendererState state,
                            Rectangle2D dataArea,
                            CategoryPlot plot,
                            CategoryAxis domainAxis,
                            ValueAxis rangeAxis,
                            GanttCategoryDataset dataset,
                            int row,
                            int column) {

        PlotOrientation orientation = plot.getOrientation();
        RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();

        // Y0
        Number value0 = dataset.getEndValue(row, column);
        if (value0 == null) {
            return;
        }
        double java2dValue0 = rangeAxis.valueToJava2D(value0.doubleValue(),
                dataArea, rangeAxisLocation);

        // Y1
        Number value1 = dataset.getStartValue(row, column);
        if (value1 == null) {
            return;
        }
        double java2dValue1 = rangeAxis.valueToJava2D(value1.doubleValue(),
                dataArea, rangeAxisLocation);

        if (java2dValue1 < java2dValue0) {
            double temp = java2dValue1;
            java2dValue1 = java2dValue0;
            java2dValue0 = temp;
            value1 = value0;
        }

        double rectStart = calculateBarW0(plot, orientation, dataArea,
                domainAxis, state, row, column);
        double rectBreadth = state.getBarWidth();
        double rectLength = Math.abs(java2dValue1 - java2dValue0);

        Rectangle2D bar = null;
        RectangleEdge barBase = null;
        if (orientation == PlotOrientation.HORIZONTAL) {
            bar = new Rectangle2D.Double(java2dValue0, rectStart, rectLength,
                    rectBreadth);
            barBase = RectangleEdge.LEFT;
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            bar = new Rectangle2D.Double(rectStart, java2dValue0, rectBreadth,
                    rectLength);
            barBase = RectangleEdge.BOTTOM;
        }

        Rectangle2D completeBar = null;
        Rectangle2D incompleteBar = null;
        Number percent = dataset.getPercentComplete(row, column);
        double start = getStartPercent();
        double end = getEndPercent();
        if (percent != null) {
            double p = percent.doubleValue();
            if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                completeBar = new Rectangle2D.Double(java2dValue0,
                        rectStart + start * rectBreadth, rectLength * p,
                        rectBreadth * (end - start));
                incompleteBar = new Rectangle2D.Double(java2dValue0
                        + rectLength * p, rectStart + start * rectBreadth,
                        rectLength * (1 - p), rectBreadth * (end - start));
            }
            else if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                completeBar = new Rectangle2D.Double(rectStart + start
                        * rectBreadth, java2dValue1 + rectLength * (1 - p),
                        rectBreadth * (end - start), rectLength * p);
                incompleteBar = new Rectangle2D.Double(rectStart + start
                        * rectBreadth, java2dValue1, rectBreadth * (end
                        - start), rectLength * (1 - p));
            }

        }

        if (getShadowsVisible()) {
            getBarPainter().paintBarShadow(g2, this, row, column, bar,
                    barBase, true);
        }
        getBarPainter().paintBar(g2, this, row, column, bar, barBase);

        if (completeBar != null) {
            g2.setPaint(getCompletePaint());
            g2.fill(completeBar);
        }
        if (incompleteBar != null) {
            g2.setPaint(getIncompletePaint());
            g2.fill(incompleteBar);
        }

        // draw the outline...
        if (isDrawBarOutline()
                && state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
            Stroke stroke = getItemOutlineStroke(row, column);
            Paint paint = getItemOutlinePaint(row, column);
            if (stroke != null && paint != null) {
                g2.setStroke(stroke);
                g2.setPaint(paint);
                g2.draw(bar);
            }
        }

        CategoryItemLabelGenerator generator = getItemLabelGenerator(row,
                column);
        if (generator != null && isItemLabelVisible(row, column)) {
            drawItemLabel(g2, dataset, row, column, plot, generator, bar,
                    false);
        }

        // submit the current data point as a crosshair candidate
        int datasetIndex = plot.indexOf(dataset);
        Comparable columnKey = dataset.getColumnKey(column);
        Comparable rowKey = dataset.getRowKey(row);
        double xx = domainAxis.getCategorySeriesMiddle(columnKey, rowKey,
                dataset, getItemMargin(), dataArea, plot.getDomainAxisEdge());
        updateCrosshairValues(state.getCrosshairState(),
                dataset.getRowKey(row), dataset.getColumnKey(column),
                value1.doubleValue(), datasetIndex, xx, java2dValue1,
                orientation);

        // collect entity and tool tip information...
        EntityCollection entities = state.getEntityCollection();
        if (entities != null) {
            addItemEntity(entities, dataset, row, column, bar);
        }
    }

    /**
     * Returns the Java2D coordinate for the middle of the specified data item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the column key.
     * @param dataset  the dataset.
     * @param axis  the axis.
     * @param area  the drawing area.
     * @param edge  the edge along which the axis lies.
     *
     * @return The Java2D coordinate.
     */
    @Override
    public double getItemMiddle(Comparable rowKey, Comparable columnKey,
            CategoryDataset dataset, CategoryAxis axis, Rectangle2D area,
            RectangleEdge edge) {
        return axis.getCategorySeriesMiddle(columnKey, rowKey, dataset,
                getItemMargin(), area, edge);
    }

    /**
     * Tests this renderer for equality with an arbitrary object.
     *
     * @param obj  the object ({@code null} permitted).
     *
     * @return A boolean.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof GanttRenderer)) {
            return false;
        }
        GanttRenderer that = (GanttRenderer) obj;
        if (!PaintUtils.equal(this.completePaint, that.completePaint)) {
            return false;
        }
        if (!PaintUtils.equal(this.incompletePaint, that.incompletePaint)) {
            return false;
        }
        if (this.startPercent != that.startPercent) {
            return false;
        }
        if (this.endPercent != that.endPercent) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtils.writePaint(this.completePaint, stream);
        SerialUtils.writePaint(this.incompletePaint, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.completePaint = SerialUtils.readPaint(stream);
        this.incompletePaint = SerialUtils.readPaint(stream);
    }

}