​

​

​

using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please add the product details.");

        Basket basket = new Basket();

        Boolean _continue = true;

        while (_continue)

        {

            Console.WriteLine("Enter product Name");

            var productCode = Console.ReadLine();

            Console.WriteLine("Enter product category A or B or C");

            var itemType = Console.ReadLine();

            Console.WriteLine("Enter product quantity");

            int productQuantity = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter product price");

            int price = Convert.ToInt32(Console.ReadLine());

            basket.AddItem(productCode, itemType.ToString(), productQuantity, price);

            Console.WriteLine("Do you want to add more products? Y/ N");

            _continue = Console.ReadLine().ToUpper() == "Y";

        }

​

        Console.WriteLine(string.Format("Total payable amount including tax:{0}", basket.GoodsTotal));

        Console.ReadLine();

    }

}

​

public class Product

{

    public Product(string name, decimal price, Catgory category)

    {

        Price = price;

        CategoryType = category;

        Name = Name;

    }

​

    public Catgory CategoryType

    {

        get;

        set;

    }

​

    public decimal Price

    {

        get;

        set;

    }

​

    public string Name

    {

        get;

        set;

    }

}

​

public class Basket

{

    public List<BasketItem> BasketItems

    {

        get;

        set;

    }

​

    public Basket()

    {

        BasketItems = new List<BasketItem>();

    }

​

    public decimal GoodsTotal

    {

        get

        {

            return BasketItems.Sum(x => x.LineTotal);

        }

    }

​

    public void AddItem(string productCode, string itemType, int quantity, decimal price)

    {

        var basketItem = GetItem(productCode, itemType, quantity, price);

        if (basketItem != null)

        {

            BasketItems.Add(basketItem);

        }

    }

​

    private BasketItem GetItem(string productCode, string itemType, int quantity, decimal price)

    {

        Catgory catgory = null;

        if (itemType.ToUpper() == "A")

        {

            catgory = new CategoryA();

        }

        else if (itemType.ToUpper() == "B")

        {

            catgory = new CategoryB();

        }

        else if (itemType.ToUpper() == "C")

        {

            catgory = new CategoryC();

        }

        else

        {

            return null;

        }

​

        var product = new Product(productCode, price, catgory);

        return new BasketItem(quantity, product);

    }

}

​

public class BasketItem

{

    public Product Product

    {

        get;

        set;

    }

​

    public BasketItem(int quantity, Product product)

    {

        Product = product;

        Quantity = quantity;

    }

​

    public decimal Price

    {

        get

        {

            return Product.Price;

        }

    }

​

    public int Quantity

    {

        get;

        private set;

    }

​

    public decimal ItemTax

    {

        get

        {

            return (Price * (Product.CategoryType.TaxPercentage / 100));

        }

    }

​

    public decimal TaxTotal

    {

        get

        {

            return ItemTax * Quantity;

        }

    }

​

    public decimal LineTotal

    {

        get

        {

            return ((Quantity * Price) + TaxTotal);

        }

    }

}

​

public class CategoryA : Catgory

{

    private const decimal _TaxPercentage = 10M;

    private const decimal _Price = 100M;

    private const string _ItemType = "CategoryA";

    public CategoryA(): base (_TaxPercentage, _ItemType)

    {

    }

}

​

public class CategoryB : Catgory

{

    private const decimal _TaxPercentage = 20M;

    private const string _ItemType = "CategoryB";

    public CategoryB(): base (_TaxPercentage, _ItemType)

    {

    }

}

​

public class CategoryC : Catgory

{

    private const decimal _TaxPercentage = 0M;

    private const string _ItemType = "CategoryC";

    public CategoryC(): base (_TaxPercentage, _ItemType)

    {

    }

}

​

public class Catgory

{

    public Catgory(decimal taxPercentage, string catgeoryType)

    {

        TaxPercentage = taxPercentage;

        CategoryType = catgeoryType;

    }

​

    public decimal TaxPercentage

    {

        get;

        set;

    }

​

    public string CategoryType

    {

        get;

        set;

    }

}