HeadFirstDesignPatterns/Ch4PizzaStore/Pizza.cs

namespace Ch4PizzaStore;

public abstract class Pizza(string name, string dough, string sauce, List<string> toppings) {
    public string Name { get; } = name;

    internal void Prepare() {
        Console.WriteLine($"Preparing {Name}");
        Console.WriteLine($"Tossing {dough} dough...");
        Console.WriteLine($"Adding {sauce} sauce...");
        Console.WriteLine("Adding toppings:");
        foreach (var topping in toppings) {
            Console.WriteLine($"\t{topping}");
        }
    }

    // While in Java all methods are by default `virtual`, C# is the same as C++,
    // all methods are final/selaed until explicitly marked as virtual.
    internal virtual void Bake() {
        Console.WriteLine("Bake for 25 minutes at 350");
    }

    internal virtual void Cut() {
        Console.WriteLine("Cutting the pizza into diagonal slices");
    }

    internal virtual void Box() {
        Console.WriteLine("Place pizza in official PizzaStore box");
    }
}

public class NYStyleCheesePizza() : Pizza("NY Style Sauce and Cheese Pizza", "Thin Crust Dough", "Marinara Sauce",
    ["Grated Reggiano Cheese"]);

public class ChicagoStyleCheesePizza() : Pizza("Chicago Style Deep Dish Cheese Pizza", "Extra Thick Crust Dough",
    "Plum Tomato Sauce", ["Shredded Mozzarella Cheese"]) {
    internal override void Cut() {
        Console.WriteLine("Cutting the pizza into square slices");
    }
}

public abstract class PizzaStore {
    protected abstract Pizza CreatePizza(string type);

    public Pizza OrderPizza(string type) {
        var pizza = CreatePizza(type);
        pizza.Prepare();
        pizza.Bake();
        pizza.Cut();
        pizza.Box();
        return pizza;
    }
}

public class NYPizzaStore : PizzaStore {
    protected override Pizza CreatePizza(string type) {
        return type switch {
            "cheese" => new NYStyleCheesePizza(),
            _ => throw new ArgumentOutOfRangeException(nameof(type), type, null)
        };
    }
}

public class ChicagoPizzaStore : PizzaStore {
    protected override Pizza CreatePizza(string type) {
        return type switch {
            "cheese" => new ChicagoStyleCheesePizza(),
            _ => throw new ArgumentOutOfRangeException(nameof(type), type, null)
        };
    }
}