namespace PizzaStore.DB; 

 public record Pizza 
 {
   public int Id {get; set;} 
   public string ? Name { get; set; }
 }

 public class PizzaDB
 {
   private static List<Pizza> _pizzas = new List<Pizza>()
   {
     new Pizza{ Id=1, Name="Cheese" },
     new Pizza{ Id=2, Name="Pepperoni" },
     new Pizza{ Id=3, Name="Pineapple extravaganza"} 
   };

   public static List<Pizza> GetPizzas() 
   {
     return _pizzas;
   } 

   public static Pizza ? GetPizza(int id) 
   {
     return _pizzas.SingleOrDefault(pizza => pizza.Id == id);
   } 

   public static Pizza CreatePizza(Pizza pizza) 
   {
     _pizzas.Add(pizza);
     return pizza;
   }
 
   public static Pizza UpdatePizza(Pizza update) 
   {
     _pizzas = _pizzas.Select(pizza =>
     {
       if (pizza.Id == update.Id)
       {
         pizza.Name = update.Name;
       }
       return pizza;
     }).ToList();
     return update;
   }

   public static void RemovePizza(int id)
   {
     _pizzas = _pizzas.FindAll(pizza => pizza.Id != id).ToList();
   }
 }