package vvpkassistant.Tools;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Base64;
import java.util.Hashtable;

public class QRCodeUtil {
    
    public static String generateQRCode(String content, int width, int height)
        throws WriterException, IOException {
        
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        
        BitMatrix matrix = new MultiFormatWriter().encode(
            content, BarcodeFormat.QR_CODE, width, height, hints);
        
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        MatrixToImageWriter.writeToStream(matrix, "PNG", outputStream);

        return Base64.getEncoder().encodeToString(outputStream.toByteArray());   
    }
}