FoodDeliveryApp.java

package java_assign2;
import java.util.*;

public class FoodDeliveryApp {
    private static List<Restaurant> restaurants = new ArrayList<>();
    private static List<Customer> customers = new ArrayList<>();
    private static List<Order> orders = new ArrayList<>();
    private static int restCounter = 1, menuCounter = 1, custCounter = 1, orderCounter = 1;
    private static Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
        System.out.println("==== Food Delivery Console App ====");
        while (true) {
            System.out.println("\n1. Add Restaurant\n2. Add Menu Item\n3. Add Customer\n4. Create Cart/Add to Cart\n5. Place Order\n6. Update Delivery Status\n7. Display Restaurants & Menus\n8. Exit\nSelect Option:");
            int choice = sc.nextInt(); sc.nextLine();
            switch(choice) {
                case 1: addRestaurant(); break;
                case 2: addMenuItem(); break;
                case 3: addCustomer(); break;
                case 4: addToCart(); break;
                case 5: placeOrder(); break;
                case 6: updateDeliveryStatus(); break;
                case 7: displayRestaurants(); break;
                case 8: System.exit(0);
            }
        }
    }

    private static void addRestaurant() {
        System.out.print("Enter restaurant name: ");
        String name = sc.nextLine();
        Restaurant r = new Restaurant(restCounter++, name);
        restaurants.add(r);
        System.out.println("Restaurant added.");
    }
    private static void addMenuItem() {
        Restaurant r = selectRestaurant();
        if (r == null) return;
        System.out.print("Enter menu item name: ");
        String name = sc.nextLine();
        System.out.print("Enter price: ");
        double price = sc.nextDouble();
        System.out.print("Enter stock: ");
        int stock = sc.nextInt(); sc.nextLine();
        MenuItem mi = new MenuItem(menuCounter++, name, price, true, stock);
        r.addMenuItem(mi);
        System.out.println("Menu item added.");
    }
    private static void addCustomer() {
        System.out.print("Enter customer name: ");
        String name = sc.nextLine();
        Customer c = new Customer(custCounter++, name);
        customers.add(c);
        System.out.println("Customer added.");
    }
    private static void addToCart() {
        Customer cust = selectCustomer();
        Restaurant rest = selectRestaurant();
        if (cust == null || rest == null) return;
        List<MenuItem> menu = rest.getMenu();
        System.out.println("Choose item by number:");
        for (int i = 0; i < menu.size(); i++)
            System.out.println((i+1) + ". " + menu.get(i));
        int itemIdx = sc.nextInt() - 1;
        MenuItem item = menu.get(itemIdx);
        if (!item.isAvailable()) {
            System.out.println("Item not available.");
            return;
        }
        System.out.print("Enter quantity: ");
        int qty = sc.nextInt(); sc.nextLine();
        if (qty > item.getStock()) {
            System.out.println("Insufficient stock.");
            return;
        }
        cust.getCart().addItem(item, qty);
        System.out.println("Item added to cart.");
    }
    private static void placeOrder() {
        Customer cust = selectCustomer();
        Cart cart = cust.getCart();
        double total = cart.getTotal(0.05, 30.0); // 5% tax, 30 INR delivery fee
        Order order = new Order(orderCounter++, cust, cart.getCartItems(), total);
        // Simulate payment
        order.confirmPayment();
        for (CartItem ci : cart.getCartItems()) ci.getItem().updateStock(-ci.getQuantity());
        order.dispatch();
        orders.add(order);
        cart.clear();
        System.out.println(order.getReceipt());
        System.out.println("Delivery timeline: " + order.getDelivery().getTimeline());
    }
    private static void updateDeliveryStatus() {
        System.out.print("Enter order ID: ");
        int oid = sc.nextInt(); sc.nextLine();
        for (Order o : orders) {
            if (o.getReceipt().contains("#" + oid)) {
                Delivery d = o.getDelivery();
                System.out.println("Current status: " + d.getStatus());
                if (d.getStatus() != DeliveryStatus.DELIVERED) {
                    System.out.print("Next status (2=DISPATCHED, 3=PICKED_UP, 4=DELIVERED): ");
                    int sidx = sc.nextInt(); sc.nextLine();
                    d.updateStatus(DeliveryStatus.values()[sidx]);
                }
                System.out.println("Timeline: " + d.getTimeline());
            }
        }
    }
    private static void displayRestaurants() {
        for (Restaurant r : restaurants) {
            System.out.println(r);
            for (MenuItem mi : r.getMenu()) System.out.println("    " + mi);
        }
    }
    private static Restaurant selectRestaurant() {
        if (restaurants.isEmpty()) { System.out.println("No restaurants."); return null; }
        System.out.println("Choose restaurant by number:");
        for (int i = 0; i < restaurants.size(); i++)
            System.out.println((i+1) + ". " + restaurants.get(i).getName());
        int idx = sc.nextInt() - 1; sc.nextLine();
        return (idx >= 0 && idx < restaurants.size()) ? restaurants.get(idx) : null;
    }
    private static Customer selectCustomer() {
        if (customers.isEmpty()) { System.out.println("No customers."); return null; }
        System.out.println("Choose customer by number:");
        for (int i = 0; i < customers.size(); i++)
            System.out.println((i+1) + ". " + customers.get(i).getName());
        int idx = sc.nextInt() - 1; sc.nextLine();
        return (idx >= 0 && idx < customers.size()) ? customers.get(idx) : null;
    }
}