using System;

public class Program

{

    public static void Main()

    {

        Beverage beverage = new DarkRoast();

        Console.WriteLine($"Cost of Dark Roast alone: {beverage.Cost()}");

        Console.WriteLine($"Description of Dark Roast alone: {beverage.GetDescription()}");

        Console.WriteLine($"Size of Dark Roast : {beverage.Size}\r\n");

        beverage = new Mocha(beverage);

        Console.WriteLine($"Cost of Dark Roast & Mocha: {beverage.Cost()}");

        Console.WriteLine($"Description of Dark Roast & Mocha: {beverage.GetDescription()}\r\n");

        beverage = new Soy(beverage);

        Console.WriteLine($"Cost of Dark Roast, Mocha & Soy: {beverage.Cost()}");

        Console.WriteLine($"Description of Dark Roast, Mocha & Soy: {beverage.GetDescription()}\r\n");

        Beverage beverageGrande = new DarkRoast();

        // Change cost of Mocha by changing size of beverage

        // Note that default value assigned to beverage.Size is the first defined element of enum BeverageSize i.e. TALL

        beverageGrande.Size = BeverageSize.GRANDE;

        beverageGrande = new Mocha(beverageGrande);

        beverageGrande = new Soy(beverageGrande);

        Console.WriteLine($"Cost of Dark Roast, Mocha & Soy: {beverageGrande.Cost()}");

        Console.WriteLine($"Description of Dark Roast, Mocha & Soy: {beverageGrande.GetDescription()}");

​

    }

    /*

    * Component class

    */

    public abstract class Beverage

    {

        private BeverageSize size;

​

        public virtual string GetDescription()

        {

            return "Unknown Beverage";

        }

​

        public BeverageSize Size

        {

            get

            {

                return size;

            }

            set

            {

                size = value;

            }

        }

​

        public abstract double Cost();

    }

    /*

    * Concrete Component class

    */

    public class DarkRoast : Beverage

    {

        public DarkRoast()

        {}

​

        public override double Cost()

        {

            return .99;

        }

​

        public override string GetDescription()

        {

            return "Dark Roast Coffee";

        }

​

    }

    /*

    * Decorator classes

    */

    public abstract class CondimentDecorator : Beverage

    {

        public CondimentDecorator()

        {}

    }

    /*

    * Concrete Decorator class

    */

    public class Mocha : CondimentDecorator

    {

        Beverage beverage;

        public Mocha(Beverage beverage)

        {

            this.beverage = beverage;

        }

​

        public override string GetDescription()

        {

            return beverage.GetDescription() + ", Mocha";

        }

​

        public override double Cost()

        {

            Console.WriteLine($"Debug beverage.Size value: {beverage.Size}");

            return GetSize(beverage.Size);

        }

​

        private double GetSize(BeverageSize size)

        {

            switch(size)

            {

                case BeverageSize.TALL:

                    return Convert.ToDouble(".10") +

                        beverage.Cost();

                case BeverageSize.GRANDE:

                    return Convert.ToDouble(".15") +

                        beverage.Cost();

                case BeverageSize.VENTI:

                    return Convert.ToDouble(".20") +

                        beverage.Cost();

                default:

                    return .20;

​

            }

        }

    }

    public class Soy : CondimentDecorator

    {

        Beverage beverage;

        public Soy(Beverage beverage)

        {

            this.beverage = beverage;

        }

​

        public override string GetDescription()

        {

            return beverage.GetDescription() + ", Soy";

        }

​

        public override double Cost()

        {

            return .25 + beverage.Cost();

        }

    }

    public enum BeverageSize

    {

        TALL,

        GRANDE,

        VENTI

    }

}