package com.github.binarywang.utils.qrcode;

import com.google.zxing.common.BitMatrix;

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

/**
 * <pre>
 * Created by Binary Wang on 2017-01-05.
 * @author <a href="https://github.com/binarywang">binarywang(Binary Wang)</a>
 * </pre>
 */
public final 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;
  }

  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);
    }
  }

}