/*
 * IconUtils.java
 *
 * Copyright (c) 2009 JAM Development Team
 *
 * This package is distributed under the Lesser Gnu Public Licence (LGPL)
 *
 */

package jam.util;

import javax.swing.*;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.*;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;


/**
 * @author rambaut
 *         Date: Jul 29, 2004
 *         Time: 10:12:49 AM
 */
public class IconUtils {
    /**
     * @return a named image from file or resource bundle.
     */
    public static Image getImage(String name) {
        return getImage(IconUtils.class, name);
    }

    private static void showWarning(final String message){

        if (EventQueue.isDispatchThread()){
           JOptionPane.showMessageDialog(null, message, "Warning",JOptionPane.WARNING_MESSAGE);
        }
        else {
            // must show message dialog in the event dispatch thread, otherwise can crash
            try {
                EventQueue.invokeAndWait(new Runnable() {
                    public void run() {
                        JOptionPane.showMessageDialog(null, message, "Warning", JOptionPane.WARNING_MESSAGE);

                    }
                });
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
        }

    }
    /**
     * @return a named image from file or resource bundle.
     */
    public static Image getImage(Class resourceClass, String name) {
        java.net.URL url = resourceClass.getResource(name);
        if (url != null) {
            return Toolkit.getDefaultToolkit().createImage(url);
        } else {
            showWarning( "Image " + name + " could not be loaded.");
            return null;
        }
    }

    /**
     * @return a named image from file or resource bundle.
     */
    public static BufferedImage getBufferedImage(String name) {
        return getBufferedImage(IconUtils.class, name);
    }

    /**
     * @return a named image from file or resource bundle.
     */
    public static BufferedImage getBufferedImage(Class resourceClass, String name) {

        java.net.URL url = resourceClass.getResource(name);
        if (url != null) {
            try {
                return ImageIO.read(url);
            } catch (IOException ioe) {
                showWarning("Image " + name + " could not be loaded.");
                return null;
            }
        }

        return null;
    }

    /**
     * @return a named icon from file or resource bundle.
     */
    public static Icon getIcon(String name) {
        return getIcon(IconUtils.class, name);
    }

    /**
     * @return a named icon from file or resource bundle.
     */
    public static Icon getIcon(Class resourceClass, String name) {
        Image image = getImage(resourceClass, name);
        if (image != null) {
            return new ImageIcon(image);
        } else {
            return null;
        }
    }

    /**
     * Returns a slightly brighter version of the icon.
     */
    public static Icon brighten(Icon icon) {
        BufferedImage img = getBufferedImageFromIcon(icon);
        if(img == null)
            return icon;
        BufferedImageOp op = new RescaleOp(1.25f, 0, null);
        return new ImageIcon(op.filter(img, null));
    }

    /**
     * Returns a slightly darker version of the icon.
     */
    public static Icon darken(Icon icon) {
        BufferedImage img = getBufferedImageFromIcon(icon);
        if(img == null)
            return icon;
        BufferedImageOp op = new RescaleOp(0.75f, 0, null);
        return new ImageIcon(op.filter(img, null));
    }

    /**
     * Returns a grayed version of the icon.
     */
    public static Icon gray(Icon icon) {
        BufferedImage img = getBufferedImageFromIcon(icon);
        if(img == null)
            return icon;
        return new ImageIcon(GrayFilter.createDisabledImage(img));
    }

    /**
     * Resizes an icon.
     */
    public static Icon resize(Icon icon, int width, int height) {
        Image image = getImageFromIcon(icon);
        if(image == null)
            return icon;
        image = image.getScaledInstance(width, height, Image.SCALE_SMOOTH);
        return new ImageIcon(image);
    }

    /**
     * Creates an image from an icon.
     */
    public static Image getImageFromIcon(Icon icon) {
        if(icon instanceof ImageIcon) {
            return ((ImageIcon)icon).getImage();
        } else {
            return getBufferedImageFromIcon(icon);
        }
    }

    /**
     * Creates a buffered image from an icon.
     */
    public static BufferedImage getBufferedImageFromIcon(Icon icon) {
        BufferedImage buffer = new BufferedImage(
                icon.getIconWidth(), icon.getIconHeight(),
                BufferedImage.TYPE_INT_ARGB);
        Graphics g = buffer.getGraphics();
        icon.paintIcon(new JLabel(), g, 0,0);
        g.dispose();
        return buffer;
    }
}