import java.awt.image.BufferedImage;
import java.util.Random;

@SuppressWarnings("unused")
public class RandomJitter implements BaseFilter {
    private static final int DEGREE = 4;
    private static final int ITERATIONS = 3;
    private Random rnd;

    public RandomJitter() {
        rnd = new Random();
    }

    @Override
    public BufferedImage process(BufferedImage source) {

        BufferedImage result = clone(source);

        int width = source.getWidth();
        int height = source.getHeight();

        for (int i= 0; i < ITERATIONS; i++) {
            for (int x = 0; x < width; x++)
                for (int y = 0; y < height; y++) {
                    int xDelta = rnd.nextInt(DEGREE + 1) - 2;
                    int yDelta = rnd.nextInt(DEGREE + 1) - 2;

                    if (x + xDelta >= 0 && x + xDelta < width && y + yDelta >= 0 && y + yDelta <height){
                       result.setRGB(x + xDelta, y + yDelta, source.getRGB(x, y));
                    }
                }
        }

        return result;
    }

    private BufferedImage clone(BufferedImage source) {
        int width = source.getWidth();
        int height = source.getHeight();

        BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        for (int i = 0; i < width; i++)
            for (int j = 0; j < height; j++) {
                result.setRGB(i, j, source.getRGB(i, j));
            }

        return result;
    }

}