Pizza Ordering System

---

📦 Project Structure

src/
└── main/
    ├── app/         → Contains the main class `PizzaTester`
    ├── model/       → Core classes: `Pizza`, `Order`, `Customer`, `InvalidPizzaException`
    └── enums/       → Enum definitions for all types (Meat, Veggie, etc.)

---

🚀 How to Run the Program

1. Open terminal in src/main/

2. Compile the classes

   javac app/*.java model/*.java enums/*.java

3. Run the main app

   java app/PizzaTester.java

---

🧑‍🍳 How it Works

• You’ll be asked how many pizzas you want to order.
• For each pizza, enter:
  • Number of slices
  • Meat, Veggie, Crust, Size
  • One or more toppings (comma-separated)
• Enter customer name, address, and phone number.
• Choose delivery or pickup.
• Your order is saved to pizza_orders.json and displayed on screen.
• The system auto-loads and shows previous orders every time it starts.

---

📄 File Format

Orders are saved in a human-readable format to pizza_orders.json
Each order includes:

• Order ID and timestamp
• Customer details
• List of pizzas with price breakdown
• Delivery/pickup option
• Grand total with discount if applicable

---

💡 Notes

• Input is case-insensitive, but enum values must match predefined options.
• A 5% discount is applied if you order more than one pizza.
• Invalid entries throw friendly custom exceptions.
• Orders are appended, not overwritten — you’ll always have your order history!