package utils;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.common.BitMatrix;

import javax.imageio.ImageIO;

import models.utils.EWBase64;

import play.Play;

import sun.misc.BASE64Encoder;

import java.io.File;

import java.io.OutputStream;

import java.io.IOException;

import java.sql.Timestamp;

import java.util.HashMap;

import java.util.Map;

import java.awt.image.BufferedImage;

/**

 * 二维码生成类

 *

 * @author Thierry

 *

 */

public class QrcodeBuilder {

    private static final int BLACK = 0xFF000000;

    private static final int WHITE = 0xFFFFFFFF;

    private QrcodeBuilder() {

    }

    public 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 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);

        }

    }

    public 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);

        }

    }

    /**

     * 生成Qrcode图片

     *

     * @param filePath

     *            图片保存文件夹路径

     * @param content

     *            二维码内容

     * @param username

     *            提交操作的用户名

     * @return

     */

    public static String createQrCode(String filePath, String content, String username) {

        Timestamp timestamp = new Timestamp(System.currentTimeMillis());

        String fileName = EWBase64.encode(username + "_" + timestamp) + ".png";

        try {

            MultiFormatWriter multiFormatWriter = new MultiFormatWriter();

            Map hints = new HashMap();

            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

            BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400, hints);

            File file = new File(filePath, fileName);

            QrcodeBuilder.writeToFile(bitMatrix, "png", file);

        } catch (Exception e) {

            e.printStackTrace();

            return "";

        }

        return fileName + ".png";

    }

}