package com.gk.firework.Domain.Utils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import sun.misc.BASE64Encoder;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;

public class MatrixToImageWriter {
    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    private MatrixToImageWriter() {
    }

    private static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }
    private static void writeToFile(BitMatrix matrix, String format, File file)
            throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("Could not write an image of format "
                    + format + " to " + file);
        }
    }
    private static void writeToStream(BitMatrix matrix, String format,
                                      OutputStream stream) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("Could not write an image of format " + format);
        }
    }

    public static String getBase64Img(String text) throws IOException, WriterException {
        // 二维码图片宽度
        int width = 40;
        // 二维码图片高度
        int height = 40;
        // 二维码的图片格式
        String format = "jpg";
        Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
        // 内容所使用字符集编码
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

        BitMatrix bitMatrix = new MultiFormatWriter().encode(text,
                BarcodeFormat.CODE_128, width, height, hints);
        /*BitMatrix bitMatrix = new MultiFormatWriter().encode(text,
                BarcodeFormat.QR_CODE, width, height, hints);*/
        // 生成二维码
        File outputFile = new File("d:" + File.separator + "new.jpg");
        MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);

        ByteArrayOutputStream pngOutputStream = new ByteArrayOutputStream();
        MatrixToImageWriter.writeToStream(bitMatrix, "PNG", pngOutputStream);
        byte[] pngData = pngOutputStream.toByteArray();
        BASE64Encoder encoder = new BASE64Encoder();
        String png_base64 = encoder.encodeBuffer(pngData).trim();
        png_base64 = png_base64.replaceAll("\n", "").replaceAll("\r", "");
        return png_base64;
    }
}