/* ======================================================
 * JFreeChart : a chart library for the Java(tm) platform
 * ======================================================
 *
 * (C) Copyright 2000-present, by David Gilbert and Contributors.
 *
 * Project Info:  https://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.]
 *
 * ---------------
 * ChartUtils.java
 * ---------------
 * (C) Copyright 2001-present, by David Gilbert and Contributors.
 *
 * Original Author:  David Gilbert;
 * Contributor(s):   Wolfgang Irler;
 *                   Richard Atkinson;
 *                   Xavier Poinsard;
 *
 */

package org.jfree.chart;

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;

import org.jfree.chart.encoders.EncoderUtil;
import org.jfree.chart.encoders.ImageFormat;
import org.jfree.chart.imagemap.ImageMapUtils;
import org.jfree.chart.imagemap.OverLIBToolTipTagFragmentGenerator;
import org.jfree.chart.imagemap.StandardToolTipTagFragmentGenerator;
import org.jfree.chart.imagemap.StandardURLTagFragmentGenerator;
import org.jfree.chart.imagemap.ToolTipTagFragmentGenerator;
import org.jfree.chart.imagemap.URLTagFragmentGenerator;
import org.jfree.chart.util.Args;

/**
 * A collection of utility methods for JFreeChart.  Includes methods for
 * converting charts to image formats (PNG and JPEG) plus creating simple HTML
 * image maps.
 *
 * @see ImageMapUtils
 */
public abstract class ChartUtils {

    private ChartUtils() {
        // no requirement to instantiate
    }

    /**
     * Applies the current theme to the specified chart.  This method is
     * provided for convenience, the theme itself is stored in the
     * {@link ChartFactory} class.
     *
     * @param chart  the chart ({@code null} not permitted).
     */
    public static void applyCurrentTheme(JFreeChart chart) {
        ChartFactory.getChartTheme().apply(chart);
    }

    /**
     * Writes a chart to an output stream in PNG format.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsPNG(OutputStream out, JFreeChart chart,
            int width, int height) throws IOException {

        // defer argument checking...
        writeChartAsPNG(out, chart, width, height, null);

    }

    /**
     * Writes a chart to an output stream in PNG format.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param encodeAlpha  encode alpha?
     * @param compression  the compression level (0-9).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsPNG(OutputStream out, JFreeChart chart,
            int width, int height, boolean encodeAlpha, int compression)
            throws IOException {

        // defer argument checking...
        ChartUtils.writeChartAsPNG(out, chart, width, height, null,
                encodeAlpha, compression);

    }

    /**
     * Writes a chart to an output stream in PNG format.  This method allows
     * you to pass in a {@link ChartRenderingInfo} object, to collect
     * information about the chart dimensions/entities.  You will need this
     * info if you want to create an HTML image map.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info ({@code null} permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsPNG(OutputStream out, JFreeChart chart,
            int width, int height,  ChartRenderingInfo info)
            throws IOException {

        Args.nullNotPermitted(chart, "chart");
        BufferedImage bufferedImage
                = chart.createBufferedImage(width, height, info);
        EncoderUtil.writeBufferedImage(bufferedImage, ImageFormat.PNG, out);
    }

    /**
     * Writes a chart to an output stream in PNG format.  This method allows
     * you to pass in a {@link ChartRenderingInfo} object, to collect
     * information about the chart dimensions/entities.  You will need this
     * info if you want to create an HTML image map.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  carries back chart rendering info ({@code null}
     *              permitted).
     * @param encodeAlpha  encode alpha?
     * @param compression  the PNG compression level (0-9).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsPNG(OutputStream out, JFreeChart chart,
            int width, int height, ChartRenderingInfo info,
            boolean encodeAlpha, int compression) throws IOException {

        Args.nullNotPermitted(out, "out");
        Args.nullNotPermitted(chart, "chart");
        BufferedImage chartImage = chart.createBufferedImage(width, height,
                BufferedImage.TYPE_INT_ARGB, info);
        ChartUtils.writeBufferedImageAsPNG(out, chartImage, encodeAlpha,
                compression);

    }

    /**
     * Writes a scaled version of a chart to an output stream in PNG format.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the unscaled chart width.
     * @param height  the unscaled chart height.
     * @param widthScaleFactor  the horizontal scale factor.
     * @param heightScaleFactor  the vertical scale factor.
     *
     * @throws IOException if there are any I/O problems.
     */
    public static void writeScaledChartAsPNG(OutputStream out,
            JFreeChart chart, int width, int height, int widthScaleFactor,
            int heightScaleFactor) throws IOException {

        Args.nullNotPermitted(out, "out");
        Args.nullNotPermitted(chart, "chart");

        double desiredWidth = width * widthScaleFactor;
        double desiredHeight = height * heightScaleFactor;
        double defaultWidth = width;
        double defaultHeight = height;
        boolean scale = false;

        // get desired width and height from somewhere then...
        if ((widthScaleFactor != 1) || (heightScaleFactor != 1)) {
            scale = true;
        }

        double scaleX = desiredWidth / defaultWidth;
        double scaleY = desiredHeight / defaultHeight;

        BufferedImage image = new BufferedImage((int) desiredWidth,
                (int) desiredHeight, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = image.createGraphics();

        if (scale) {
            AffineTransform saved = g2.getTransform();
            g2.transform(AffineTransform.getScaleInstance(scaleX, scaleY));
            chart.draw(g2, new Rectangle2D.Double(0, 0, defaultWidth,
                    defaultHeight), null, null);
            g2.setTransform(saved);
            g2.dispose();
        }
        else {
            chart.draw(g2, new Rectangle2D.Double(0, 0, defaultWidth,
                    defaultHeight), null, null);
        }
        out.write(encodeAsPNG(image));

    }

    /**
     * Saves a chart to the specified file in PNG format.
     *
     * @param file  the file name ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsPNG(File file, JFreeChart chart,
            int width, int height) throws IOException {

        // defer argument checking...
        saveChartAsPNG(file, chart, width, height, null);

    }

    /**
     * Saves a chart to a file in PNG format.  This method allows you to pass
     * in a {@link ChartRenderingInfo} object, to collect information about the
     * chart dimensions/entities.  You will need this info if you want to
     * create an HTML image map.
     *
     * @param file  the file ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info ({@code null} permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsPNG(File file, JFreeChart chart,
            int width, int height, ChartRenderingInfo info)
        throws IOException {

        Args.nullNotPermitted(file, "file");
        OutputStream out = new BufferedOutputStream(new FileOutputStream(file));
        try {
            ChartUtils.writeChartAsPNG(out, chart, width, height, info);
        }
        finally {
            out.close();
        }
    }

    /**
     * Saves a chart to a file in PNG format.  This method allows you to pass
     * in a {@link ChartRenderingInfo} object, to collect information about the
     * chart dimensions/entities.  You will need this info if you want to
     * create an HTML image map.
     *
     * @param file  the file ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info ({@code null} permitted).
     * @param encodeAlpha  encode alpha?
     * @param compression  the PNG compression level (0-9).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsPNG(File file, JFreeChart chart,
           int width, int height, ChartRenderingInfo info, boolean encodeAlpha,
           int compression) throws IOException {

        Args.nullNotPermitted(file, "file");
        Args.nullNotPermitted(chart, "chart");
        OutputStream out = new BufferedOutputStream(new FileOutputStream(file));
        try {
            writeChartAsPNG(out, chart, width, height, info, encodeAlpha,
                    compression);
        }
        finally {
            out.close();
        }

    }

    /**
     * Writes a chart to an output stream in JPEG format.  Please note that
     * JPEG is a poor format for chart images, use PNG if possible.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsJPEG(OutputStream out,
            JFreeChart chart, int width, int height) throws IOException {

        // defer argument checking...
        writeChartAsJPEG(out, chart, width, height, null);

    }

    /**
     * Writes a chart to an output stream in JPEG format.  Please note that
     * JPEG is a poor format for chart images, use PNG if possible.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param quality  the quality setting.
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsJPEG(OutputStream out, float quality,
            JFreeChart chart, int width, int height) throws IOException {

        // defer argument checking...
        ChartUtils.writeChartAsJPEG(out, quality, chart, width, height,
                null);

    }

    /**
     * Writes a chart to an output stream in JPEG format. This method allows
     * you to pass in a {@link ChartRenderingInfo} object, to collect
     * information about the chart dimensions/entities.  You will need this
     * info if you want to create an HTML image map.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info ({@code null} permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsJPEG(OutputStream out, JFreeChart chart,
            int width, int height, ChartRenderingInfo info)
            throws IOException {

        Args.nullNotPermitted(out, "out");
        Args.nullNotPermitted(chart, "chart");
        BufferedImage image = chart.createBufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB, info);
        EncoderUtil.writeBufferedImage(image, ImageFormat.JPEG, out);

    }

    /**
     * Writes a chart to an output stream in JPEG format.  This method allows
     * you to pass in a {@link ChartRenderingInfo} object, to collect
     * information about the chart dimensions/entities.  You will need this
     * info if you want to create an HTML image map.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param quality  the output quality (0.0f to 1.0f).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info ({@code null} permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsJPEG(OutputStream out, float quality,
            JFreeChart chart, int width, int height, ChartRenderingInfo info)
            throws IOException {

        Args.nullNotPermitted(out, "out");
        Args.nullNotPermitted(chart, "chart");
        BufferedImage image = chart.createBufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB, info);
        EncoderUtil.writeBufferedImage(image, ImageFormat.JPEG, out, quality);

    }

    /**
     * Saves a chart to a file in JPEG format.
     *
     * @param file  the file ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsJPEG(File file, JFreeChart chart,
            int width, int height) throws IOException {

        // defer argument checking...
        saveChartAsJPEG(file, chart, width, height, null);

    }

    /**
     * Saves a chart to a file in JPEG format.
     *
     * @param file  the file ({@code null} not permitted).
     * @param quality  the JPEG quality setting.
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsJPEG(File file, float quality,
            JFreeChart chart, int width, int height) throws IOException {

        // defer argument checking...
        saveChartAsJPEG(file, quality, chart, width, height, null);

    }

    /**
     * Saves a chart to a file in JPEG format.  This method allows you to pass
     * in a {@link ChartRenderingInfo} object, to collect information about the
     * chart dimensions/entities.  You will need this info if you want to
     * create an HTML image map.
     *
     * @param file  the file name ({@code null} not permitted).
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info ({@code null} permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsJPEG(File file, JFreeChart chart,
            int width, int height, ChartRenderingInfo info) throws IOException {

        Args.nullNotPermitted(file, "file");
        Args.nullNotPermitted(chart, "chart");
        OutputStream out = new BufferedOutputStream(new FileOutputStream(file));
        try {
            writeChartAsJPEG(out, chart, width, height, info);
        }
        finally {
            out.close();
        }

    }

    /**
     * Saves a chart to a file in JPEG format.  This method allows you to pass
     * in a {@link ChartRenderingInfo} object, to collect information about the
     * chart dimensions/entities.  You will need this info if you want to
     * create an HTML image map.
     *
     * @param file  the file name ({@code null} not permitted).
     * @param quality  the quality setting.
     * @param chart  the chart ({@code null} not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info ({@code null} permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsJPEG(File file, float quality,
            JFreeChart chart, int width, int height,
            ChartRenderingInfo info) throws IOException {

        Args.nullNotPermitted(file, "file");
        Args.nullNotPermitted(chart, "chart");
        OutputStream out = new BufferedOutputStream(new FileOutputStream(
                file));
        try {
            writeChartAsJPEG(out, quality, chart, width, height, info);
        }
        finally {
            out.close();
        }

    }

    /**
     * Writes a {@link BufferedImage} to an output stream in JPEG format.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param image  the image ({@code null} not permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeBufferedImageAsJPEG(OutputStream out,
            BufferedImage image) throws IOException {

        // defer argument checking...
        writeBufferedImageAsJPEG(out, 0.75f, image);

    }

    /**
     * Writes a {@link BufferedImage} to an output stream in JPEG format.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param quality  the image quality (0.0f to 1.0f).
     * @param image  the image ({@code null} not permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeBufferedImageAsJPEG(OutputStream out, float quality,
            BufferedImage image) throws IOException {

        EncoderUtil.writeBufferedImage(image, ImageFormat.JPEG, out, quality);

    }

    /**
     * Writes a {@link BufferedImage} to an output stream in PNG format.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param image  the image ({@code null} not permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeBufferedImageAsPNG(OutputStream out,
            BufferedImage image) throws IOException {

        EncoderUtil.writeBufferedImage(image, ImageFormat.PNG, out);

    }

    /**
     * Writes a {@link BufferedImage} to an output stream in PNG format.
     *
     * @param out  the output stream ({@code null} not permitted).
     * @param image  the image ({@code null} not permitted).
     * @param encodeAlpha  encode alpha?
     * @param compression  the compression level (0-9).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeBufferedImageAsPNG(OutputStream out,
            BufferedImage image, boolean encodeAlpha, int compression)
            throws IOException {

        EncoderUtil.writeBufferedImage(image, ImageFormat.PNG, out,
                compression, encodeAlpha);
    }

    /**
     * Encodes a {@link BufferedImage} to PNG format.
     *
     * @param image  the image ({@code null} not permitted).
     *
     * @return A byte array in PNG format.
     *
     * @throws IOException if there is an I/O problem.
     */
    public static byte[] encodeAsPNG(BufferedImage image) throws IOException {
        return EncoderUtil.encode(image, ImageFormat.PNG);
    }

    /**
     * Encodes a {@link BufferedImage} to PNG format.
     *
     * @param image  the image ({@code null} not permitted).
     * @param encodeAlpha  encode alpha?
     * @param compression  the PNG compression level (0-9).
     *
     * @return The byte array in PNG format.
     *
     * @throws IOException if there is an I/O problem.
     */
    public static byte[] encodeAsPNG(BufferedImage image, boolean encodeAlpha,
            int compression) throws IOException {
        return EncoderUtil.encode(image, ImageFormat.PNG, compression,
                encodeAlpha);
    }

    /**
     * Writes an image map to an output stream.
     *
     * @param writer  the writer ({@code null} not permitted).
     * @param name  the map name ({@code null} not permitted).
     * @param info  the chart rendering info ({@code null} not permitted).
     * @param useOverLibForToolTips  whether to use OverLIB for tooltips
     *                               (http://www.bosrup.com/web/overlib/).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeImageMap(PrintWriter writer, String name,
            ChartRenderingInfo info, boolean useOverLibForToolTips)
            throws IOException {

        ToolTipTagFragmentGenerator toolTipTagFragmentGenerator;
        if (useOverLibForToolTips) {
            toolTipTagFragmentGenerator
                    = new OverLIBToolTipTagFragmentGenerator();
        }
        else {
            toolTipTagFragmentGenerator
                    = new StandardToolTipTagFragmentGenerator();
        }
        ImageMapUtils.writeImageMap(writer, name, info,
                toolTipTagFragmentGenerator,
                new StandardURLTagFragmentGenerator());

    }

    /**
     * Writes an image map to the specified writer.
     *
     * @param writer  the writer ({@code null} not permitted).
     * @param name  the map name ({@code null} not permitted).
     * @param info  the chart rendering info ({@code null} not permitted).
     * @param toolTipTagFragmentGenerator  a generator for the HTML fragment
     *     that will contain the tooltip text ({@code null} not permitted
     *     if {@code info} contains tooltip information).
     * @param urlTagFragmentGenerator  a generator for the HTML fragment that
     *     will contain the URL reference ({@code null} not permitted if
     *     {@code info} contains URLs).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeImageMap(PrintWriter writer, String name,
            ChartRenderingInfo info,
            ToolTipTagFragmentGenerator toolTipTagFragmentGenerator,
            URLTagFragmentGenerator urlTagFragmentGenerator)
            throws IOException {

        writer.println(ImageMapUtils.getImageMap(name, info,
                toolTipTagFragmentGenerator, urlTagFragmentGenerator));
    }

    /**
     * Creates an HTML image map.  This method maps to
     * {@link ImageMapUtils#getImageMap(String, ChartRenderingInfo,
     * ToolTipTagFragmentGenerator, URLTagFragmentGenerator)}, using default
     * generators.
     *
     * @param name  the map name ({@code null} not permitted).
     * @param info  the chart rendering info ({@code null} not permitted).
     *
     * @return The map tag.
     */
    public static String getImageMap(String name, ChartRenderingInfo info) {
        return ImageMapUtils.getImageMap(name, info,
                new StandardToolTipTagFragmentGenerator(),
                new StandardURLTagFragmentGenerator());
    }

    /**
     * Creates an HTML image map.  This method maps directly to
     * {@link ImageMapUtils#getImageMap(String, ChartRenderingInfo,
     * ToolTipTagFragmentGenerator, URLTagFragmentGenerator)}.
     *
     * @param name  the map name ({@code null} not permitted).
     * @param info  the chart rendering info ({@code null} not permitted).
     * @param toolTipTagFragmentGenerator  a generator for the HTML fragment
     *     that will contain the tooltip text ({@code null} not permitted
     *     if {@code info} contains tooltip information).
     * @param urlTagFragmentGenerator  a generator for the HTML fragment that
     *     will contain the URL reference ({@code null} not permitted if
     *     {@code info} contains URLs).
     *
     * @return The map tag.
     */
    public static String getImageMap(String name, ChartRenderingInfo info,
            ToolTipTagFragmentGenerator toolTipTagFragmentGenerator,
            URLTagFragmentGenerator urlTagFragmentGenerator) {

        return ImageMapUtils.getImageMap(name, info,
                toolTipTagFragmentGenerator, urlTagFragmentGenerator);

    }

}