package fr.mael.jiwigo.transverse.util;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.FileImageOutputStream;
import javax.swing.ImageIcon;

/**
   Copyright (c) 2010, Mael
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of jiwigo nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   DISCLAIMED. IN NO EVENT SHALL Mael BE LIABLE FOR ANY
   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   
 * @author mael
 *
 */
public class ImagesUtil {
    /**
     * Logger
     */
    public static final org.apache.commons.logging.Log LOG = org.apache.commons.logging.LogFactory
	    .getLog(ImagesUtil.class);

    /**
     * Fonction de rotation d'une image
     * @param image l'image à tourner
     * @param angle l'angle de rotation
     * @return l'image pivotée
     */
    public static BufferedImage rotate(BufferedImage image, double angle) {
	GraphicsConfiguration gc = getDefaultConfiguration();
	double sin = Math.abs(Math.sin(angle)), cos = Math.abs(Math.cos(angle));
	int w = image.getWidth(), h = image.getHeight();
	int neww = (int) Math.floor(w * cos + h * sin), newh = (int) Math.floor(h * cos + w * sin);
	int transparency = image.getColorModel().getTransparency();
	BufferedImage result = gc.createCompatibleImage(neww, newh, transparency);
	Graphics2D g = result.createGraphics();
	g.translate((neww - w) / 2, (newh - h) / 2);
	g.rotate(angle, w / 2, h / 2);
	g.drawRenderedImage(image, null);
	return result;
    }

    /**
     * @return
     */
    public static GraphicsConfiguration getDefaultConfiguration() {
	GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
	GraphicsDevice gd = ge.getDefaultScreenDevice();
	return gd.getDefaultConfiguration();
    }

    /**
     * Ecriture d'une image dans un fichier png
     * @param file le fichier
     * @param bufferedImage l'image
     * @throws IOException
     */
    public static void writeImageToPNG(File file, BufferedImage bufferedImage) throws IOException {
	ImageIO.write(bufferedImage, "png", file);
    }

    /**
     * Mise à l'échelle d'une image
     * @param filePath le chemin vers le fichier de l'image
     * @param tempName le nom du fichier résultat
     * @param width la largeur
     * @param height la hauteur
     * @return true si l'image a effectivement ete redimensionnee
     * @throws Exception
     */
    public static boolean scale(String filePath, String tempName, int width, int height) throws Exception {
	File file = new File(filePath);
	InputStream imageStream = new BufferedInputStream(new FileInputStream(filePath));
	Image image = (Image) ImageIO.read(imageStream);

	double thumbRatio = (double) width / (double) height;
	int imageWidth = image.getWidth(null);
	int imageHeight = image.getHeight(null);
	//on n'agrandit pas l'image
	if (imageWidth < width || imageHeight < height) {
	    return false;
	}
	double imageRatio = (double) imageWidth / (double) imageHeight;
	if (thumbRatio < imageRatio) {
	    height = (int) (width / imageRatio);
	} else {
	    width = (int) (height * imageRatio);
	}
	BufferedImage thumbImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	Graphics2D graphics2D = thumbImage.createGraphics();
	graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
	graphics2D.drawImage(image, 0, 0, width, height, null);

	//	ImageIO.write(thumbImage, "jpg", new FileOutputStream(System.getProperty("java.io.tmpdir") + "/" + tempName));
	saveImage(System.getProperty("java.io.tmpdir") + "/" + tempName, thumbImage);
	return true;

    }

    private static void saveImage(String fileName, BufferedImage img) throws FileNotFoundException, IOException {
	Iterator iter = ImageIO.getImageWritersByFormatName("jpeg");
	ImageWriter writer = (ImageWriter) iter.next();
	ImageWriteParam iwp = writer.getDefaultWriteParam();
	iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
	iwp.setCompressionQuality(1);
	File outputfile = new File(fileName);
	FileImageOutputStream output = new FileImageOutputStream(outputfile);
	writer.setOutput(output);
	IIOImage outimage = new IIOImage(img, null, null);
	writer.write(null, outimage, iwp);
	writer.dispose();
    }

    // This method returns a buffered image with the contents of an image
    public static BufferedImage toBufferedImage(Image image) {
	if (image instanceof BufferedImage) {
	    return (BufferedImage) image;
	}

	// This code ensures that all the pixels in the image are loaded
	image = new ImageIcon(image).getImage();

	// Determine if the image has transparent pixels; for this method's
	// implementation, see Determining If an Image Has Transparent Pixels
	boolean hasAlpha = hasAlpha(image);

	// Create a buffered image with a format that's compatible with the screen
	BufferedImage bimage = null;
	GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
	try {
	    // Determine the type of transparency of the new buffered image
	    int transparency = Transparency.OPAQUE;
	    if (hasAlpha) {
		transparency = Transparency.BITMASK;
	    }

	    // Create the buffered image
	    GraphicsDevice gs = ge.getDefaultScreenDevice();
	    GraphicsConfiguration gc = gs.getDefaultConfiguration();
	    bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency);
	} catch (HeadlessException e) {
	    // The system does not have a screen
	}

	if (bimage == null) {
	    // Create a buffered image using the default color model
	    int type = BufferedImage.TYPE_INT_RGB;
	    if (hasAlpha) {
		type = BufferedImage.TYPE_INT_ARGB;
	    }
	    bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
	}

	// Copy image to buffered image
	Graphics g = bimage.createGraphics();

	// Paint the image onto the buffered image
	g.drawImage(image, 0, 0, null);
	g.dispose();

	return bimage;
    }

    // This method returns true if the specified image has transparent pixels
    public static boolean hasAlpha(Image image) {
	// If buffered image, the color model is readily available
	if (image instanceof BufferedImage) {
	    BufferedImage bimage = (BufferedImage) image;
	    return bimage.getColorModel().hasAlpha();
	}

	// Use a pixel grabber to retrieve the image's color model;
	// grabbing a single pixel is usually sufficient
	PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
	try {
	    pg.grabPixels();
	} catch (InterruptedException e) {
	}

	// Get the image's color model
	ColorModel cm = pg.getColorModel();
	return cm.hasAlpha();
    }

}