Main.java

import java.util.Scanner;

// Main entry point for the Asset Management & Analytics System
// Orchestrates authentication and inventory management
public class Main {
    private PasswordHasher auth;
    private Scanner scanner;
    private String currentUser;
    private InventoryTracker currentInventory;

    public Main() {
        auth = new PasswordHasher();
        scanner = new Scanner(System.in);
        currentUser = null;
        currentInventory = null;
    }

    // Authentication menu - shows until user logs in
    public void authMenu() {
        while (currentUser == null) {
            System.out.println("\n" + "=".repeat(50));
            System.out.println("  Asset Management & Analytics System");
            System.out.println("=".repeat(50));
            System.out.println("  1. Register");
            System.out.println("  2. Login");
            System.out.println("  3. Exit");
            System.out.print("  Choose: ");

            String choice = scanner.nextLine().trim();

            switch (choice) {
                case "1":
                    System.out.print("  Enter username: ");
                    String regUsername = scanner.nextLine().trim();
                    System.out.print("  Enter password: ");
                    String regPassword = scanner.nextLine();
                    if (auth.registerUser(regUsername, regPassword)) {
                        // User registered, stay on auth menu
                    }
                    break;

                case "2":
                    System.out.print("  Enter username: ");
                    String loginUsername = scanner.nextLine().trim();
                    System.out.print("  Enter password: ");
                    String loginPassword = scanner.nextLine();
                    if (auth.loginUser(loginUsername, loginPassword)) {
                        currentUser = loginUsername;
                        currentInventory = new InventoryTracker();
                    }
                    break;

                case "3":
                    System.out.println("\n  Goodbye!");
                    scanner.close();
                    System.exit(0);

                default:
                    System.out.println("  [ERROR] Invalid option!");
            }
        }
    }

    // User dashboard - main menu after login, delegates to InventoryTracker
    public void dashboardMenu() {
        while (currentUser != null) {
            System.out.println("\n" + "=".repeat(50));
            System.out.println("  Dashboard (" + currentUser + ")");
            System.out.println("=".repeat(50));
            System.out.println("  1. View Assets");
            System.out.println("  2. Add Asset");
            System.out.println("  3. Update Asset Quantity");
            System.out.println("  4. Edit Asset");
            System.out.println("  5. View Stats");
            System.out.println("  6. Sort & View Assets");
            System.out.println("  7. Logout");
            System.out.print("  Choose: ");

            String choice = scanner.nextLine().trim();

            switch (choice) {
                case "1":
                    currentInventory.viewAssets();
                    break;

                case "2":
                    currentInventory.addAsset(scanner);
                    break;

                case "3":
                    currentInventory.updateAssetQty(scanner);
                    break;

                case "4":
                    currentInventory.editAsset(scanner);
                    break;

                case "5":
                    currentInventory.showStats();
                    break;

                case "6":
                    currentInventory.sortAndView(scanner);
                    break;

                case "7":
                    System.out.println("  [INFO] Logged out!");
                    currentUser = null;
                    currentInventory = null;
                    break;

                default:
                    System.out.println("  [ERROR] Invalid option!");
            }
        }
    }

    // Main control flow - loop between auth and dashboard menus
    public void run() {
        while (true) {
            authMenu();
            dashboardMenu();
        }
    }

    public static void main(String[] args) {
        Main app = new Main();
        app.run();
    }
}