package com.net.util;

import java.awt.BasicStroke;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.Shape;

import java.awt.geom.RoundRectangle2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.OutputStream;

import java.util.Hashtable;

import java.util.Random;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.BinaryBitmap;

import com.google.zxing.DecodeHintType;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatReader;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.Result;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.common.HybridBinarizer;

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/********************************************************************************

 * Description: 二维码制作工具类

 * @author zhangdi

 * @version 1.0

 */

public class QRCodeUtil {

    private static final String CHARSET = "utf-8";

    private static final String FORMAT_NAME = "JPG";

    // 二维码尺寸

    private static final int QRCODE_SIZE = 300;

    // LOGO宽度

    private static final int WIDTH = 60;

    // LOGO高度

    private static final int HEIGHT = 60;  

    /**

     * 生成二维码

     * @param content   源内容

     * @param imgPath   生成二维码保存的路径

     * @param needCompress  是否要压缩

     * @return      返回二维码图片

     * @throws Exception

     */

    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {

        Hashtable hints = new Hashtable();

        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);

        hints.put(EncodeHintType.MARGIN, 1);

        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,

                hints);

        int width = bitMatrix.getWidth();

        int height = bitMatrix.getHeight();

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        for (int x = 0; x < width; x++) {

            for (int y = 0; y < height; y++) {

                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);

            }

        }

        if (imgPath == null || "".equals(imgPath)) {

            return image;

        }

        // 插入图片

        QRCodeUtil.insertImage(image, imgPath, needCompress);

        return image;

    }  

    /**

     * 在生成的二维码中插入图片

     * @param source

     * @param imgPath

     * @param needCompress

     * @throws Exception

     */

    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {

        File file = new File(imgPath);

        if (!file.exists()) {

            System.err.println("" + imgPath + "   该文件不存在！");

            return;

        }

        Image src = ImageIO.read(new File(imgPath));

        int width = src.getWidth(null);

        int height = src.getHeight(null);

        if (needCompress) { // 压缩LOGO

            if (width > WIDTH) {

                width = WIDTH;

            }

            if (height > HEIGHT) {

                height = HEIGHT;

            }

            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);

            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

            Graphics g = tag.getGraphics();

            g.drawImage(image, 0, 0, null); // 绘制缩小后的图

            g.dispose();

            src = image;

        }

        // 插入LOGO

        Graphics2D graph = source.createGraphics();

        int x = (QRCODE_SIZE - width) / 2;

        int y = (QRCODE_SIZE - height) / 2;

        graph.drawImage(src, x, y, width, height, null);

        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);

        graph.setStroke(new BasicStroke(3f));

        graph.draw(shape);

        graph.dispose();

    }  

    /**

     * 生成带logo二维码，并保存到磁盘

     * @param content

     * @param imgPath   logo图片

     * @param destPath

     * @param needCompress

     * @throws Exception

     */

    public static String encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {

        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

        mkdirs(destPath);

        String file = new Random().nextInt(99999999) + ".jpg";//生成随机文件名

        ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));

        return file;

    }  

    public static void mkdirs(String destPath) {

        File file = new File(destPath);

        // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir。(mkdir如果父目录不存在则会抛出异常)

        if (!file.exists() && !file.isDirectory()) {

            file.mkdirs();

        }

    }  

    public static void encode(String content, String imgPath, String destPath) throws Exception {

        QRCodeUtil.encode(content, imgPath, destPath, false);

    }  

    public static void encode(String content, String destPath, boolean needCompress) throws Exception {

        QRCodeUtil.encode(content, null, destPath, needCompress);

    }  

    public static void encode(String content, String destPath) throws Exception {

        QRCodeUtil.encode(content, null, destPath, false);

    }  

    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)

            throws Exception {

        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

        ImageIO.write(image, FORMAT_NAME, output);

    }  

    public static void encode(String content, OutputStream output) throws Exception {

        QRCodeUtil.encode(content, null, output, false);

    }  

    /**

     * 从二维码中，解析数据

     * @param file  二维码图片文件

     * @return   返回从二维码中解析到的数据值

     * @throws Exception

     */

    public static String decode(File file) throws Exception {

        BufferedImage image;

        image = ImageIO.read(file);

        if (image == null) {

            return null;

        }

        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);

        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        Result result;

        Hashtable hints = new Hashtable();

        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);

        result = new MultiFormatReader().decode(bitmap, hints);

        String resultStr = result.getText();

        return resultStr;

    }  

    public static String decode(String path) throws Exception {

        return QRCodeUtil.decode(new File(path));

    }

//    try {

////String text = "http://weifeng.nethangzhou.com/wf/weixin/getUserInfoCode";

//String text = "http://www.lechuan100.com/plugin.php?id=haven_article&mod=my&aid=21";

////生成带logo 的二维码

////QRCodeUtil.encode(text, "d:/730.png", "d:/wfqrcode", true);

////生成不带logo 的二维码

//QRCodeUtil.encode(text,"","d:/wfqrcode",true);

//

////指定二维码图片，解析返回数据

////System.out.println(QRCodeUtil.decode("D:/WPS/75040887.jpg"));

//} catch (Exception e) {

//e.printStackTrace();

//}

}