/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

import java.awt.Color;

import java.awt.EventQueue;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.util.List;

import javax.imageio.ImageIO;

import javax.swing.JEditorPane;

import javax.swing.text.html.HTMLEditorKit;

/**

 * @test

 * @bug 8134256

 * @summary Different "background-position" should produce different pages

 */

public final class BackgroundImagePosition {

    static final List<String> pos = List.of("", "-2", "-1", "1px", "2px", "3px",

                                            "1em", "2em", "3em", "10%", "55%",

                                            "-1em", "-2em", "-3em", "-10%");

    static final int SIZE = 300;

    public static void main(final String[] args) throws Exception {

        // The image which we will place on the page

        final BufferedImage bi = new BufferedImage(50, 50,

                                                   BufferedImage.TYPE_INT_ARGB);

        final Graphics2D g = bi.createGraphics();

        g.setColor(Color.GREEN);

        g.fillRect(0, 0, 50, 50);

        g.dispose();

        final File file = new File("file.png");

        ImageIO.write(bi, "png", file);

        for (final String x : pos) {

            final BufferedImage img1 = test(x, x);

            for (final String y : pos) {

                // Different positions should produce different pages

                if (!x.equals(y)) {

                    compareImages(img1, test(x, y));

                    compareImages(img1, test(y, x));

                }

            }

        }

    }

    /**

     * Throws an exception if the images are the same.

     */

    static void compareImages(final BufferedImage img1,

                              final BufferedImage img2) throws IOException {

        for (int imgX = 0; imgX < SIZE; ++imgX) {

            for (int imgY = 0; imgY < SIZE; ++imgY) {

                if (img1.getRGB(imgX, imgY) != img2.getRGB(imgX, imgY)) {

                    return;

                }

            }

        }

        ImageIO.write(img1, "png", new File("img1.png"));

        ImageIO.write(img2, "png", new File("img2.png"));

        throw new RuntimeException("Same images for different size");

    }

    static BufferedImage test(final String x, final String y) throws Exception {

        final BufferedImage bi = new BufferedImage(SIZE, SIZE,

                                                   BufferedImage.TYPE_INT_ARGB);

        EventQueue.invokeAndWait(() -> {

            try {

                final JEditorPane jep = new JEditorPane();

                final HTMLEditorKit kit = new HTMLEditorKit();

                jep.setEditorKit(kit);

                jep.setText(

                        "<style>body {"

                                + "background-image: url(file:./file.png);"

                                + "background-repeat: no-repeat;"

                                + "background-position: " + x + " " + y + ";"

                                + "background-color: #FF0000;"

                                + "}</style><body></body>");

                jep.setSize(SIZE, SIZE);

                final Graphics2D graphics = bi.createGraphics();

                jep.paint(graphics);

                graphics.dispose();

            } catch (final Exception e) {

                throw new RuntimeException(e);

            }

        });

        return bi;

    }

}