using System;

using System.Collections.Generic;

public class Basket

{

    public List<BasketItem> items { get; set; }

   public Basket()

   {

        items = new List<BasketItem>();

   }

    public void AddItem(string productCode, int quantity ) 

    {

        items.Add(new BasketItem(productCode, quantity));

    }

    public void RemoveItem(string productCode, int quantity ) 

    {

        var index = items.FindIndex(i => i.ProductCode == productCode);

        if (index >= 0) {  

            items.RemoveAt(index);

        }

    }

}

​

​

public class BasketItem

{

    public string ProductCode { get; set; }

    public int Quantity { get; set; }

   public BasketItem(string productCode, int quantity)

   {

        ProductCode = productCode;

        Quantity = quantity;

   }

}

​

public class BasketService 

{

    public BasketRepository BasketRepositoryy { get; set; }

   public BasketService()

   {

        BasketRepositoryy = new BasketRepository();

   }

    public void AddItem(string productCode, int quantity ) 

    {

        BasketRepositoryy.AddItem(productCode, quantity);

    }

    public void RemoveItem(string productCode, int quantity ) 

    {

        BasketRepositoryy.RemoveItem(productCode, quantity);

    }

     public List<BasketItem> GetList() 

     {

         return BasketRepositoryy.GetList();

     }

}

​

 public class BasketRepository

    {

    public List<BasketItem> items { get; set; }

   public BasketRepository()

   {

        items = new List<BasketItem>();

   }

    public void AddItem(string productCode, int quantity ) 

    {

        items.Add(new BasketItem(productCode, quantity));

    }

    public void RemoveItem(string productCode, int quantity ) 

    {

        var index = items.FindIndex(i => i.ProductCode == productCode);

        if (index >= 0) {  

            items.RemoveAt(index);

        }

    }

     public List<BasketItem> GetList() 

     {

         return items;

     }

}

​

​

public class Program

{   

    public static void Main()

    {

        Basket bas = new Basket();

        bas.AddItem("Water 100ml", 10);

        bas.AddItem("Mars", 100);

        bas.AddItem("Lays 500g", 100);

        bas.items.ForEach(i => Console.Write("{0}\t", i.ProductCode));

        Console.Write("\n");

        bas.RemoveItem("Mars", 100);

        bas.items.ForEach(i => Console.Write("{0}\t", i.ProductCode));

         Console.Write("||||||||||||||||||||||||||||||||||||||");

        Console.Write("\n");

        BasketService basService = new BasketService();

        basService.AddItem("Water 100ml", 10);

        basService.AddItem("Mars", 100);

        basService.AddItem("Lays 500g", 100);

        basService.GetList().ForEach(i => Console.Write("{0}\t", i.ProductCode));

        Console.Write("\n");

        basService.RemoveItem("Mars", 100);

        basService.GetList().ForEach(i => Console.Write("{0}\t", i.ProductCode));

    }

}