import java.util.Scanner;

public class FlipImageApp {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int[][] image = { { 1,  34, 23, 23 }, { 3, 4, 345,  23 }, { 5, 6, 234, 34 },
                { 5, 6, 6, 67 }, { 3, 5, 67, 4 } };

        printImage(image);
        String answer = "y";
        while (answer.equals("y")) {

            System.out.println(
                    "Press 1 to swap the image horizontally: \n\nPress 2 to swap the image vertically: \n\nPress 0 to terminate the program: ");
            int decision = scanner.nextInt();
            if (decision == 1) {

                System.out.println("Horizontal swap: \n\n ----------------");
                flipHorizontally(image);
                printImage(image);
            } else if (decision == 2) {

                System.out.println("Vertical swap: \n\n ----------------");
                flipVertically(image);
                printImage(image);
            } else if (decision == 0) {
                System.out.println("Thanks for using this program!");
                return;
            } else {
                System.out.println("Please Pick 1 or 2.");
            }
            System.out.println("Again? (y/n)");
            answer = scanner.next();
            if (!answer.equals("y")) {
                System.out.println("Thanks for using this program!");
            }
        }

    }

    public static void printImage(int[][] image) {
        for (int i = 0; i < image.length; i++) {
            for (int j = 0; j < image[i].length; j++) {
                System.out.print(image[i][j] + "   ");
            }
            System.out.println("\n\n");
        }
        System.out.println("-------------------\n");
    }

    public static void flipHorizontally(int[][] image) {
        int temp;
        for (int i = 0; i < image.length; i++) {
            for (int j = 0; j < image[i].length / 2; j++) {
                temp = image[i][j];
                image[i][j] = image[i][image[i].length - 1 - j];
                image[i][image[i].length - 1 - j] = temp;
            }
        }
    }

    public static void flipVertically(int[][] image) {
        int temp;
        for (int i = 0; i < image.length / 2; i++) {
            for (int j = 0; j < image[i].length; j++) {
                temp = image[i][j];
                image[i][j] = image[image.length - 1 - i][j];
                image[image.length - 1 - i][j] = temp;
            }
        }
    }

}