UserManagementSystem.java

import java.util.Scanner;

public class UserManagementSystem {
    private static UserService userService;
    private static Scanner scanner;
    private static User currentUser;
    
    public static void main(String[] args) {
        userService = new UserService();
        scanner = new Scanner(System.in);
        currentUser = null;
        
        System.out.println("=====================================");
        System.out.println("   USER & PROFILE MANAGEMENT SYSTEM   ");
        System.out.println("=====================================");
        
        while (true) {
            displayMainMenu();
            int choice = getIntInput("Enter your choice: ");
            
            switch (choice) {
                case 1:
                    userService.registerUser();
                    break;
                case 2:
                    currentUser = userService.loginUser();
                    break;
                case 3:
                    if (currentUser != null) {
                        userService.updateProfile(currentUser);
                    } else {
                        System.out.println("✗ Please login first!");
                    }
                    break;
                case 4:
                    userService.searchUserByEmail();
                    break;
                case 5:
                    userService.displayAllUsers();
                    break;
                case 6:
                    if (currentUser != null) {
                        System.out.println("✓ Logged out successfully!");
                        currentUser = null;
                    } else {
                        System.out.println("No user is currently logged in.");
                    }
                    break;
                case 7:
                    System.out.println("Thank you for using the system!");
                    System.out.println("Goodbye!");
                    scanner.close();
                    System.exit(0);
                    break;
                default:
                    System.out.println("✗ Invalid choice! Please try again.");
            }
            
            System.out.println("\nPress Enter to continue...");
            scanner.nextLine();
        }
    }
    
    private static void displayMainMenu() {
        System.out.println("\n=====================================");
        if (currentUser != null) {
            System.out.println("   Logged in as: " + currentUser.getName());
        } else {
            System.out.println("   Status: Not Logged In");
        }
        System.out.println("=====================================");
        System.out.println("1. Register New User");
        System.out.println("2. Login");
        System.out.println("3. Update My Profile");
        System.out.println("4. Search User Profile");
        System.out.println("5. View All Users");
        System.out.println("6. Logout");
        System.out.println("7. Exit");
        System.out.println("=====================================");
    }
    
    private static int getIntInput(String prompt) {
        System.out.print(prompt);
        while (!scanner.hasNextInt()) {
            System.out.print("Invalid input! " + prompt);
            scanner.next();
        }
        int choice = scanner.nextInt();
        scanner.nextLine(); // Consume newline
        return choice;
    }
}