package com.mydataway.common.utils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageConfig;
import com.google.zxing.client.j2se.MatrixToImageWriter;
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.HashMap;
import java.util.Map;

/**
 * 生成二维码
 * Date:     2019/12/2 10:35
 * @author hetao
 */
public class QrCodeUtil {

    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    private static final MatrixToImageConfig DEFAULT_CONFIG = new MatrixToImageConfig();

    /**
     * 生成二维码
     * 经过base64编码
     *
     * @param url
     * @return
     */
    public static String createQrCodeBase64(String url) {
        String base64String = "";
        try {
            Map<EncodeHintType, String> hints = new HashMap<>(4);
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, hints);
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

            BufferedImage bufferedImage = toBufferedImage(bitMatrix);
            ImageIO.write(bufferedImage, "jpg", outputStream);

            BASE64Encoder encoder = new BASE64Encoder();
            base64String = encoder.encode(outputStream.toByteArray());
            System.out.println();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "data:image/jpg;base64," + base64String;
    }

    /**
     * 生成二维码
     * 生成流
     *
     * @param url
     * @return
     */
    public static String createQrCodeStream(String url) {
        String base64String = "";
        try {
            Map<EncodeHintType, String> hints = new HashMap<>(4);
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, hints);
            MatrixToImageWriter.toBufferedImage(bitMatrix, DEFAULT_CONFIG);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return base64String;
    }

    /**
     * 生成二维码
     * 直接生成图片文件
     * @param url
     * @param path
     * @param fileName
     * @return
     */
    public static String createQrCodeFile(String url, String path, String fileName) {
        try {
            Map<EncodeHintType, String> hints = new HashMap<>(4);
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, hints);
            File file = new File(path, fileName);
            boolean isTrue = file.exists() || ((file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile());
            if (isTrue) {
                writeToFile(bitMatrix, "jpg", file);
                System.out.println("成功：" + file);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    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);
        }
    }

    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);
        }
    }

    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;
    }

    public static void main(String[] args) {
        //生成链接
        String url = "https://www.baidu.com";
        //配置生成路径
        String path = "C:users/photo/";
        //生成文件名称
        String fileName = "二维码.png";
        String qrCodeBase64 = createQrCodeBase64(url);
        System.out.println(qrCodeBase64);

    }
}