using System;

public class SundaeShop

{

    public static void Main()

    {

        MakeTurtleSundae();

        MakeCaramelCashewSundae();

    }

    private static void MakeTurtleSundae()

    {

        //Build the sundae

        Pecans turtleSundae = new Pecans(new HotFudge(new Caramel(new Vanilla(new Icecream()))));

        Console.WriteLine("Turtle Sundae:");

        Console.WriteLine(string.Format("    {0} {1}", turtleSundae.GetName(), String.Format("{0:C}", turtleSundae.GetPrice())));       

    }

    private static void MakeCaramelCashewSundae()

    {

        //Build the sundae

        SeniorDiscount caramelCashewSundae = new SeniorDiscount(new SalesTax(new Cashews(new Caramel(new Vanilla(new Icecream())))));

        Console.WriteLine("Caramel Cashew Sundae:");

        Console.WriteLine(string.Format("    {0} {1}", caramelCashewSundae.GetName(), String.Format("{0:C}", caramelCashewSundae.GetPrice())));     

    }

​

}

​

public abstract class Component

{

    public abstract string GetName();

    public abstract double GetPrice();

}

public class Icecream : Component

{

    private string m_Name = "Icecream";

    private double m_Price = 2.0;

    public override string GetName()

    {

        return m_Name;

    }

    public override double GetPrice()

    {

        return m_Price;

    }

}      

​

///Decorators 

public abstract class Decorator : Component

{

    protected Component m_component;

    protected string m_Name = "Undefined Decorator";

    protected double m_Price = 0.0;

    protected Decorator(Component component)

    {

        m_component = component;

    }

    public override string GetName()

    {

        return string.Format("{0}, {1}", m_component.GetName(), m_Name);

    }

    public override double GetPrice()

    {

        return m_Price + m_component.GetPrice();

    }

}

public class Vanilla : Decorator

{

    public Vanilla(Component component)

        : base(component)

        {

            this.m_Name = "Vanilla";

            this.m_Price = 0.0;

        }

}

​

public class Chocolate : Decorator

{

    public Chocolate(Component component)

        : base(component)

        {

            this.m_Name = "Chocolate";

            this.m_Price = 0.0;

        }

}

​

public class Cream : Decorator

{

    public Cream(Component component)

        : base(component)

        {

            this.m_Name = "Cream";

            this.m_Price = 1.0;

        }

}

​

public class Cashews : Decorator

{

    public Cashews(Component component)

        : base(component)

        {

            this.m_Name = "Cashews";

            this.m_Price = 0.25;

        }

}

​

public class Pecans : Decorator

{

    public Pecans(Component component)

        : base(component)

        {

            this.m_Name = "Pecans";

            this.m_Price = 0.45;

        }

}

​

public class Caramel : Decorator

{

    public Caramel(Component component)

        : base(component)

        {

            this.m_Name = "Caramel";

            this.m_Price = 0.25;

        }

}

​

public class HotFudge : Decorator

{

    public HotFudge(Component component)

        : base(component)

        {

            this.m_Name = "Hot Fudge";

            this.m_Price = 0.15;

        }

}

​

public class SalesTax : Decorator

{

    public SalesTax(Component component)

        : base(component)

        {

            this.m_Name = "Sales Tax";

            this.m_Price = 0.055;

        }

    public override double GetPrice()

    {

        return base.GetPrice() * ( 1 + m_Price);

    }

}

​

public class SeniorDiscount : Decorator

{

    public SeniorDiscount(Component component)

        : base(component)

        {

            this.m_Name = "Senior Discount";

            this.m_Price = 0.1;

        }

    public override double GetPrice()

    {

        return base.GetPrice() - ( base.GetPrice() * m_Price);

    }

}