import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.imageio.ImageIO;

public class Test {

	public static double compareImage(File fileA, File fileB) {

	    double percentage = 0.0;
	    try {
	        // take buffer data from both image files //
	        BufferedImage biA = ImageIO.read(fileA);
	        DataBuffer dbA = biA.getData().getDataBuffer();
	        double sizeA = dbA.getSize();

	        BufferedImage biB = ImageIO.read(fileB);
	        DataBuffer dbB = biB.getData().getDataBuffer();
	        double sizeB = dbB.getSize();

	        double count = 0;

	        // compare data-buffer objects //
	        if (sizeA == sizeB) {

	            for (int i = 0; i < sizeA; i++) {

	                if (dbA.getElem(i) == dbB.getElem(i)) {
	                    count = count + 1;
	                }

	            }


	            percentage = (count * 100) / sizeA;

	        } else {

	        }

	    } catch (Exception e) {
	        System.out.println("Failed to compare image files ... "  ) ;
	        System.out.println(fileB.getPath());
	        e.printStackTrace();
	    }
	    if (percentage >= 25)
	    {

	    	System.out.println("Image file "+ fileB.getPath()+" is similar to reference file" );
	    	System.out.println("These images are "+  percentage + "% similar" );
	    	System.out.println();
	    }
	    return 0;
	}




	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
//		File B = new File("C:\\Users\\Zack\\Desktop\\Project_1_datasets\\2\\40694.jpg");

		File fileA = new File("C:\\Users\\Zack\\Desktop\\Project_1_datasets\\2\\40694.jpg");
		System.out.println("Reference file is: "+ fileA.getPath());
		System.out.println("Start search? (Y/N)");

		try (Stream<Path> filePathStream=Files.walk(Paths.get("C:\\Users\\Zack\\Desktop\\Project_1_datasets\\"))) {
		    filePathStream.forEach(filePath -> {
		        if (Files.isRegularFile(filePath)) {
		        	File fileB = new File(filePath.toString());
		        	compareImage(fileA ,fileB);
		        }
		    });
		System.out.println("Done searching");
		}
	}
}