import javax.swing.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.image.BufferedImage;
import java.awt.Color;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.ArrayList;

public class Main {
    static List<String> hexCodes = new ArrayList<>();
    static int imageWidth = 0;
    static int imageHeight = 0;

    public static void main(String[] args) {
        JFrame frame = new JFrame("Drag and Drop Image");
        frame.setSize(400, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JLabel label = new JLabel("Drop an image file here", SwingConstants.CENTER);
        label.setFont(label.getFont().deriveFont(16f));
        frame.add(label);

        new DropTarget(frame, new DropTargetListener() {
            @Override
            public void dragEnter(DropTargetDragEvent dtde) {}
            @Override
            public void dragOver(DropTargetDragEvent dtde) {}
            @Override
            public void dropActionChanged(DropTargetDragEvent dtde) {}
            @Override
            public void dragExit(DropTargetEvent dte) {}

            @Override
            public void drop(DropTargetDropEvent dtde) {
                try {
                    dtde.acceptDrop(DnDConstants.ACTION_COPY);
                    @SuppressWarnings("unchecked")
                    List<File> files = (List<File>) dtde.getTransferable()
                            .getTransferData(DataFlavor.javaFileListFlavor);
                    for (File file : files) {
                        if (isImageFile(file)) {
                            hexCodes.clear();
                            processImage(file);
                            System.out.println("FINISHED");
                            reconstructImageFromHexCodes();
                            frame.dispose();
                            return;
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private static boolean isImageFile(File f) {
        String[] exts = {"png", "jpg", "jpeg", "bmp", "gif"};
        String name = f.getName().toLowerCase();
        for (String ext : exts) {
            if (name.endsWith(ext)) return true;
        }
        return false;
    }

    private static void processImage(File file) {
        try {
            BufferedImage img = ImageIO.read(file);
            if (img == null) {
                return;
            }
            int w = img.getWidth();
            int h = img.getHeight();
            imageWidth = w;
            imageHeight = h;

            for (int y = 0; y < h; y++) {
                StringBuilder rowHex = new StringBuilder();
                for (int x = 0; x < w; x++) {
                    int pixel = img.getRGB(x, y);
                    int r = (pixel >> 16) & 0xFF;
                    int g = (pixel >> 8) & 0xFF;
                    int b = pixel & 0xFF;
                    String hex = String.format("#%02X%02X%02X", r, g, b);
                    hexCodes.add(hex);
                    rowHex.append(hex).append(" ");
                }
                System.out.println(rowHex.toString().trim());
                System.out.println("NEXT ROW");
            }
        } catch (IOException e) {
        }
    }

    private static void reconstructImageFromHexCodes() {
        if (hexCodes.isEmpty() || imageWidth == 0 || imageHeight == 0) {
            return;
        }

        BufferedImage newImage = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
        int index = 0;
        for (int y = 0; y < imageHeight; y++) {
            for (int x = 0; x < imageWidth; x++) {
                String hex = hexCodes.get(index++);
                int rgb = ColorFromHex(hex);
                newImage.setRGB(x, y, rgb);
            }
        }

        SwingUtilities.invokeLater(() -> {
            JFrame displayFrame = new JFrame("Display");
            displayFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
            displayFrame.setSize(imageWidth, imageHeight);
            JLabel label = new JLabel(new ImageIcon(newImage));
            displayFrame.add(label);
            displayFrame.pack();
            displayFrame.setLocationRelativeTo(null);
            displayFrame.setVisible(true);
        });
    }

    private static int ColorFromHex(String hex) {
        if (hex.startsWith("#")) {
            hex = hex.substring(1);
        }
        int r = Integer.parseInt(hex.substring(0, 2), 16);
        int g = Integer.parseInt(hex.substring(2, 4), 16);
        int b = Integer.parseInt(hex.substring(4, 6), 16);
        return (r << 16) | (g << 8) | b;
    }
}