Restaurant_Ordering_System .java

import java.util.*;

class Restaurant_Ordering_System {

    static Scanner ip = new Scanner(System.in);
    static int orderprice = 0;
    static String billItems = "";

    public static void main(String[] args) {

        System.out.println("\n====================================");
        System.out.println("        ONLINE FOOD ORDERING");
        System.out.println("====================================");

        System.out.print("\nEnter Customer Name : ");
        String name = ip.nextLine();

        // Mobile validation
        String mobile;
        while (true) {
            System.out.print("Enter Mobile Number : ");
            mobile = ip.next();

            if (mobile.length() == 10 && mobile.matches("\\d+")) {
                break;
            } else {
                System.out.println("Invalid Mobile Number. Enter exactly 10 digits.");
            }
        }

        // Order type
        System.out.println("\nOrder Type");
        System.out.println("1. Dine-in");
        System.out.println("2. Takeaway");
        System.out.print("Select Option : ");
        int orderType = ip.nextInt();

        int packingCharge = (orderType == 2) ? 30 : 0;

        int billID = (int) (Math.random() * 900000) + 100000;

        // Restaurant list
        System.out.println("\n----------- RESTAURANTS -----------");

        System.out.printf("%-10s %-25s\n", "Hotel No", "Restaurant Name");
        System.out.println("---------------------------------------");

        System.out.printf("%-10d %-25s\n", 1, "Buhari Restaurant");
        System.out.printf("%-10d %-25s\n", 2, "Saravana Bhavan");
        System.out.printf("%-10d %-25s\n", 3, "Aasife Biriyani");

        System.out.print("\nSelect Restaurant : ");
        int hotel = ip.nextInt();

        boolean more = true;

        while (more) {

            int price = 0;
            String itemName = "";
            int itemChoice;

            switch (hotel) {

                case 1 -> {

                    System.out.println("\n------ Buhari Restaurant Menu ------");

                    System.out.printf("%-10s %-20s %-10s\n", "Item No", "Food", "Price");
                    System.out.println("---------------------------------------------");

                    System.out.printf("%-10d %-20s ₹%-10d\n", 1, "Chicken Biryani", 220);
                    System.out.printf("%-10d %-20s ₹%-10d\n", 2, "Mutton Biryani", 320);
                    System.out.printf("%-10d %-20s ₹%-10d\n", 3, "Chicken 65", 180);

                    System.out.print("\nSelect Item : ");
                    itemChoice = ip.nextInt();

                    switch (itemChoice) {
                        case 1 -> {
                            itemName = "Chicken Biryani";
                            price = 220;
                        }
                        case 2 -> {
                            itemName = "Mutton Biryani";
                            price = 320;
                        }
                        case 3 -> {
                            itemName = "Chicken 65";
                            price = 180;
                        }
                        default -> {
                            System.out.println("Invalid Item!");
                            continue;
                        }
                    }
                }

                case 2 -> {

                    System.out.println("\n------ Saravana Bhavan Menu ------");

                    System.out.printf("%-10s %-20s %-10s\n", "Item No", "Food", "Price");
                    System.out.println("---------------------------------------------");

                    System.out.printf("%-10d %-20s ₹%-10d\n", 1, "Ghee Roast", 90);
                    System.out.printf("%-10d %-20s ₹%-10d\n", 2, "Meals", 120);
                    System.out.printf("%-10d %-20s ₹%-10d\n", 3, "Mini Tiffin", 150);

                    System.out.print("\nSelect Item : ");
                    itemChoice = ip.nextInt();

                    switch (itemChoice) {
                        case 1 -> {
                            itemName = "Ghee Roast";
                            price = 90;
                        }
                        case 2 -> {
                            itemName = "Meals";
                            price = 120;
                        }
                        case 3 -> {
                            itemName = "Mini Tiffin";
                            price = 150;
                        }
                        default -> {
                            System.out.println("Invalid Item!");
                            continue;
                        }
                    }
                }

                case 3 -> {

                    System.out.println("\n------ Aasife Biriyani Menu ------");

                    System.out.printf("%-10s %-20s %-10s\n", "Item No", "Food", "Price");
                    System.out.println("---------------------------------------------");

                    System.out.printf("%-10d %-20s ₹%-10d\n", 1, "Egg Biryani", 160);
                    System.out.printf("%-10d %-20s ₹%-10d\n", 2, "Tandoori Full", 450);
                    System.out.printf("%-10d %-20s ₹%-10d\n", 3, "Garlic Naan", 45);

                    System.out.print("\nSelect Item : ");
                    itemChoice = ip.nextInt();

                    switch (itemChoice) {
                        case 1 -> {
                            itemName = "Egg Biryani";
                            price = 160;
                        }
                        case 2 -> {
                            itemName = "Tandoori Full";
                            price = 450;
                        }
                        case 3 -> {
                            itemName = "Garlic Naan";
                            price = 45;
                        }
                        default -> {
                            System.out.println("Invalid Item!");
                            continue;
                        }
                    }
                }

                default -> {
                    System.out.println("Invalid Restaurant!");
                    return;
                }
            }

            // NEW LINE ADDED
            System.out.println("\nOrder Placed : " + itemName + "\n");

            System.out.print("Enter Quantity : ");
            int qty = ip.nextInt();

            int total = price * qty;

            orderprice += total;

            billItems += String.format("%-15s x%d*%-5d ₹%-5d\n", itemName, qty, price, total);

            System.out.print("\nAdd More Items? (1:Yes / 2:No) : ");
            if (ip.nextInt() != 1)
                more = false;
        }

        // Calculations
        double discount = (orderprice > 500) ? orderprice * 0.10 : 0;
        double gst = (orderprice - discount) * 0.05;

        double finalTotal = orderprice - discount + gst + packingCharge;

        // Bill
        System.out.println("\n====================================");
        System.out.println("             FINAL BILL");
        System.out.println("====================================");

        System.out.println("Customer : " + name);
        System.out.println("Mobile   : " + mobile);
        System.out.println("Type     : " + (orderType == 1 ? "Dine-in" : "Takeaway"));

        System.out.println("------------------------------------");

        System.out.printf("%-15s %-12s %-8s\n", "Item Name", "Qty*Price", "Total");

        System.out.println("------------------------------------");

        System.out.print(billItems);

        System.out.println("------------------------------------");

        System.out.printf("Subtotal        : ₹%d\n", orderprice);

        if (discount > 0)
            System.out.printf("Discount (10%%)  : -₹%.2f\n", discount);

        System.out.printf("GST (5%%)        : ₹%.2f\n", gst);

        if (packingCharge > 0)
            System.out.printf("Packing Charge  : ₹%d\n", packingCharge);

        System.out.println("------------------------------------");

        System.out.printf("GRAND TOTAL     : ₹%.2f\n", finalTotal);

        System.out.println("------------------------------------");

        // Payment
        System.out.println("\nSelect Payment Method");
        System.out.println("1. UPI / GPay");
        System.out.println("2. Cash");

        System.out.print("\nEnter Option : ");
        int payment = ip.nextInt();

        try {

            if (payment == 1) {

                System.out.println("\n[SYSTEM] Connecting to Payment Gateway...");
                Thread.sleep(1500);

                System.out.print("Enter Bill ID (" + billID + ") : ");
                int confirm = ip.nextInt();

                if (confirm == billID) {

                    System.out.print("Verifying Payment");

                    for (int i = 0; i < 3; i++) {
                        Thread.sleep(800);
                        System.out.print(".");
                    }

                    int orderID = (int) (Math.random() * 10000);

                    System.out.println("\n\nPayment Successful!");
                    System.out.println("Order ID : ORD" + orderID);
                    System.out.println("Status   : Sent to Kitchen");

                } else {

                    System.out.println("\nVerification Failed.");
                }

            } else {

                int orderID = (int) (Math.random() * 10000);

                System.out.println("\nOrder Registered!\n");
                System.out.println("Order ID : ORD" + orderID + "\n");

                System.out.println("Please pay ₹" + (int) finalTotal + " at counter.");
                System.out.println("\n------------------------------------");
                System.out.println("(: Please proceed to the Cashier Counter");
                System.out.println("   Show Order ID: ORD" + orderID);
                System.out.println("   Pay ₹" + (int) finalTotal + " to confirm your order :)");
                System.out.println("------------------------------------");
            }

            System.out.println("\n====================================");
            System.out.println("THANKS " + name.toUpperCase() + " VISIT AGAIN!");
            System.out.println("====================================\n");

        } catch (InterruptedException e) {

            System.out.println("System Error.");
        }
    }
}