import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class MenuExample {
    public static void main(String[] args) throws Exception {
        Scanner scanner = new Scanner(System.in);

        // Welcome message
        System.out.println("Welcome to the Food Ordering System!");
        System.out.println("Press any key to continue...");
        System.in.read();

        String[] foods = {"Pizza", "Sandwich", "Shawarma", "Hamburger", "Juice"};
        String[] sizes = {"L", "XL", "XXL"};
        String[] addOns = {"Mayonnaise", "Sauce", "Cheese"};

        while (true) {
            System.out.println("\nMain Menu:");
            for (int i = 0; i < foods.length; i++) {
                System.out.println((i + 1) + ". " + foods[i]);
            }
            System.out.println("6. Exit");
            System.out.print("Select an item (1-6): ");
            int foodChoice = scanner.nextInt();
            scanner.nextLine();
            if (foodChoice == 6) break;
            if (foodChoice < 1 || foodChoice > foods.length) {
                System.out.println("Invalid choice. Please select again.");
                continue;
            }
            String selectedFood = foods[foodChoice - 1];
            String selectedSize = selectSize(scanner, sizes);
            if (selectedSize == null) continue; // Go back if size selection is canceled
            List<String> selectedAddOns = selectAddOns(scanner, addOns);
            if (selectedAddOns == null) {
                selectedSize = selectSize(scanner, sizes); // Go back to size menu if add-on selection is canceled
                if (selectedSize == null) continue; // Ensure size is selected again
                selectedAddOns = selectAddOns(scanner, addOns);
                if (selectedAddOns == null) continue; // Go back if add-on selection is canceled again
            }
            // Summary of the order
            System.out.println("\nYou ordered: " + selectedFood + " - " + selectedSize);
            if (!selectedAddOns.isEmpty()) {
                System.out.println("Add-ons: " + String.join(", ", selectedAddOns));
            } else {
                System.out.println("No add-ons selected.");
            }
            System.out.println("Thank you for your order!");
            break; // Exit the loop after the order is complete
        }
        scanner.close();
    }

    private static String selectSize(Scanner scanner, String[] sizes) {
        while (true) {
            System.out.println("\nSelect Size:");
            for (int i = 0; i < sizes.length; i++) {
                System.out.println((i + 1) + ". " + sizes[i]);
            }
            System.out.println((sizes.length + 1) + ". Go Back");
            System.out.print("Choose a size (1-" + (sizes.length + 1) + "): ");
            int sizeChoice = scanner.nextInt();
            scanner.nextLine();
            if (sizeChoice == sizes.length + 1) return null; // Go back
            if (sizeChoice >= 1 && sizeChoice <= sizes.length) {
                return sizes[sizeChoice - 1]; // Return the selected size
            }
            System.out.println("Invalid choice. Please select again.");
        }
    }

    private static List<String> selectAddOns(Scanner scanner, String[] addOns) {
        List<String> selectedAddOns = new ArrayList<>();
        while (true) {
            System.out.println("\nAdd-ons:");
            for (int i = 0; i < addOns.length; i++) {
                System.out.println((i + 1) + ". " + addOns[i]);
            }
            System.out.println((addOns.length + 1) + ". Done");
            System.out.println((addOns.length + 2) + ". Go Back");
            System.out.print("Choose an add-on (1-" + (addOns.length + 2) + "): ");
            int addOnChoice = scanner.nextInt();
            scanner.nextLine();
            if (addOnChoice == addOns.length + 1) {
                return selectedAddOns; // Finish selection
            } else if (addOnChoice == addOns.length + 2) {
                return null; // Go back to size selection
            } else if (addOnChoice >= 1 && addOnChoice <= addOns.length) {
                selectedAddOns.add(addOns[addOnChoice - 1]); // Add selected add-on
            } else {
                System.out.println("Invalid choice. Please select again.");
            }
        }
    }
}


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