git'n a system-desgin-primer

B4/Solutions/object_oriented_design/food_delivery/features.text

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+Features of this Food Delivery System:
+
+1. Customer Class: Represents a customer with attributes like name, address, and phone number.
+
+2. Restaurant Class: Represents a restaurant with a menu. It allows the system to show available 
+   items and get the price of food.
+
+3. DeliveryPerson Class: Represents a delivery person who is assigned to deliver an order.
+
+4. Order Class: Represents an order with details like the customer, restaurant, and the food 
+    item ordered. It also includes the price of the order.
+    
+5. FoodDeliverySystem Class: This is the core of the system. It manages customers, restaurants, 
+    delivery personnel, and the order placement process. It assigns a delivery person to each order.

B4/Solutions/object_oriented_design/food_delivery/food_delivery.py

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+class Customer:
+    def __init__(self, name, address, phone):
+        self.name = name
+        self.address = address
+        self.phone = phone
+
+    def __str__(self):
+        return f"Customer: {self.name}, Address: {self.address}, Phone: {self.phone}"
+
+
+class Restaurant:
+    def __init__(self, name, menu):
+        self.name = name
+        self.menu = menu  # menu is a dictionary with item names as keys and prices as values
+
+    def show_menu(self):
+        print(f"Menu for {self.name}:")
+        for item, price in self.menu.items():
+            print(f"{item}: ${price:.2f}")
+
+    def get_price(self, item):
+        return self.menu.get(item, None)
+
+    def __str__(self):
+        return f"Restaurant: {self.name}"
+
+
+class DeliveryPerson:
+    def __init__(self, name):
+        self.name = name
+
+    def deliver(self, customer, order):
+        print(f"{self.name} is delivering {order.food_item} to {customer.name} at {customer.address}")
+
+    def __str__(self):
+        return f"Delivery Person: {self.name}"
+
+
+class Order:
+    def __init__(self, customer, restaurant, food_item):
+        self.customer = customer
+        self.restaurant = restaurant
+        self.food_item = food_item
+        self.price = self.restaurant.get_price(food_item)
+
+    def display_order_details(self):
+        print(f"Order Details: \nCustomer: {self.customer.name}\nFood Item: {self.food_item}\n"
+              f"Price: ${self.price:.2f}\nRestaurant: {self.restaurant.name}")
+
+    def __str__(self):
+        return f"Order: {self.food_item} from {self.restaurant.name} for {self.customer.name}"
+
+
+class FoodDeliverySystem:
+    def __init__(self):
+        self.customers = []
+        self.restaurants = []
+        self.delivery_people = []
+
+    def add_customer(self, customer):
+        self.customers.append(customer)
+
+    def add_restaurant(self, restaurant):
+        self.restaurants.append(restaurant)
+
+    def add_delivery_person(self, delivery_person):
+        self.delivery_people.append(delivery_person)
+
+    def place_order(self, customer, restaurant, food_item):
+        if food_item not in restaurant.menu:
+            print(f"Sorry, {food_item} is not available at {restaurant.name}.")
+            return None
+
+        order = Order(customer, restaurant, food_item)
+        order.display_order_details()
+        delivery_person = self.assign_delivery_person()
+        if delivery_person:
+            delivery_person.deliver(customer, order)
+        return order
+
+    def assign_delivery_person(self):
+        if not self.delivery_people:
+            print("No delivery person available at the moment.")
+            return None
+        # Assign the first available delivery person
+        return self.delivery_people[0]
+
+    def show_restaurants(self):
+        for restaurant in self.restaurants:
+            print(restaurant)
+
+    def show_customers(self):
+        for customer in self.customers:
+            print(customer)
+
+
+# Example usage
+if __name__ == "__main__":
+    # Initialize the system
+    delivery_system = FoodDeliverySystem()
+
+    # Create some customers
+    customer1 = Customer("Alice", "123 Main St", "555-1234")
+    customer2 = Customer("Bob", "456 Oak St", "555-5678")
+
+    # Add customers to the system
+    delivery_system.add_customer(customer1)
+    delivery_system.add_customer(customer2)
+
+    # Create some restaurants with menus
+    pizza_place = Restaurant("Pizza Place", {"Pizza": 10.99, "Burger": 7.99, "Pasta": 8.99})
+    sushi_spot = Restaurant("Sushi Spot", {"Sushi Roll": 12.99, "Tempura": 9.99, "Miso Soup": 3.99})
+
+    # Add restaurants to the system
+    delivery_system.add_restaurant(pizza_place)
+    delivery_system.add_restaurant(sushi_spot)
+
+    # Create a delivery person
+    delivery_person1 = DeliveryPerson("John")
+
+    # Add delivery person to the system
+    delivery_system.add_delivery_person(delivery_person1)
+
+    # Display available restaurants
+    print("Available Restaurants:")
+    delivery_system.show_restaurants()
+
+    # Customer places an order
+    print("\nCustomer 1 places an order:")
+    delivery_system.place_order(customer1, pizza_place, "Pizza")
+
+    # Another customer places an order
+    print("\nCustomer 2 places an order:")
+    delivery_system.place_order(customer2, sushi_spot, "Sushi Roll")