PatternDecorator

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Events
{
    delegate void PongYou();
    delegate bool Comparer(int a, int b);
    class Program
    {
        static void Main(string[] args)
        {
            Beverage beverage1 = new Espresso();
            Console.WriteLine(beverage1.GetDescription() + " $" + beverage1.Cost());
            Console.WriteLine();

            Beverage beverage11 = new Espresso();
            beverage11.SetSize(3);
            Console.WriteLine(beverage11.GetDescription() + " $" + beverage11.Cost());
            Console.WriteLine();

            Beverage beverage2 = new DarkRoast();
            beverage2 = new Mocha(beverage2);
            beverage2 = new Mocha(beverage2);
            beverage2 = new Whip(beverage2);
            Console.WriteLine(beverage2.GetDescription() + " $" + beverage2.Cost());
            Console.WriteLine();

            Beverage beverage22 = new DarkRoast();
            beverage22.SetSize(2);
            beverage22 = new Mocha(beverage22);
            beverage22 = new Mocha(beverage22);
            beverage22 = new Whip(beverage22);
            Console.WriteLine(beverage22.GetDescription() + " $" + beverage22.Cost());
            Console.WriteLine();

            Beverage beverage3 = new HouseBlend();
            beverage3 = new Soy(beverage3);
            beverage3 = new Mocha(beverage3);
            beverage3 = new Whip(beverage3);
            Console.WriteLine(beverage3.GetDescription() + " $" + beverage3.Cost());
            Console.WriteLine();

            Beverage beverage33 = new HouseBlend();
            beverage33.SetSize(1);
            beverage33 = new Soy(beverage33);
            beverage33 = new Mocha(beverage33);
            beverage33 = new Whip(beverage33);
            Console.WriteLine(beverage33.GetDescription() + " $" + beverage33.Cost());
            Console.WriteLine();
            Console.ReadKey();
        }
    }

    class Whip : CondimentDecorator
    {
        private Beverage _beverage;
        public Whip(Beverage beverage)
        {
            _beverage = beverage;
        }

        public override float Cost()
        {
            float cost = _beverage.Cost();
            switch (GetSize())
            {
                case 1:
                    cost += 0.02f;
                    break;
                case 2:
                    cost += 0.05f;
                    break;
                case 3:
                    cost += 0.10f;
                    break;
            }
            return cost;
        }

        public override int GetSize()
        {
            return _beverage.GetSize();
        }

        public override string GetDescription()
        {
            return _beverage.GetDescription() + " + Взбитые сливки";
        }
    }

    class Soy : CondimentDecorator
    {
        private Beverage _beverage;
        public Soy(Beverage beverage)
        {
            _beverage = beverage;
        }

        public override float Cost()
        {
            float cost = _beverage.Cost();
            switch (GetSize())
            {
                case 1:
                    cost += 0.02f;
                    break;
                case 2:
                    cost += 0.08f;
                    break;
                case 3:
                    cost += 0.15f;
                    break;
            }
            return cost;
        }

        public override int GetSize()
        {
            return _beverage.GetSize();
        }

        public override string GetDescription()
        {
            return _beverage.GetDescription() + " + Соя";
        }
    }

    class Mocha : CondimentDecorator
    {
        private Beverage _beverage;
        public Mocha(Beverage beverage)
        {
            _beverage = beverage;
        }

        public override float Cost()
        {
            float cost = _beverage.Cost();
            switch (GetSize())
            {
                case 1:
                    cost += 0.05f;
                    break;
                case 2:
                    cost += 0.10f;
                    break;
                case 3:
                    cost += 0.20f;
                    break;
            }
            return cost;
        }

        public override int GetSize()
        {
            return _beverage.GetSize();
        }

        public override string GetDescription()
        {
            return _beverage.GetDescription() + " + Шоколад";
        }
    }

    class Decaf : Beverage
    {
        public Decaf()
        {
            _description = "Без кофеина";
        }

        public override float Cost()
        {
            switch (GetSize())
            {
                case 1:
                    return 0.35f;
                case 2:
                    return 0.65f;
                case 3:
                    return 0.99f;
                default:
                    return 0f;
            }
        }
    }

    class DarkRoast : Beverage
    {
        public DarkRoast()
        {
            _description = "Темная обжарка";
        }

        public override float Cost()
        {
            switch (GetSize())
            {
                case 1:
                    return 0.35f;
                case 2:
                    return 0.65f;
                case 3:
                    return 0.99f;
                default:
                    return 0f;
            }
        }
    }

    class HouseBlend : Beverage
    {
        public HouseBlend()
        {
            _description = "Домашняя обжарка";
        }

        public override float Cost()
        {
            switch (GetSize())
            {
                case 1:
                    return 0.25f;
                case 2:
                    return 0.55f;
                case 3:
                    return 0.89f;
                default:
                    return 0f;
            }
        }
    }

    class Espresso : Beverage
    {
        public Espresso()
        {
            _description = "Обычный эспрессо";
        }

        public override float Cost()
        {
            switch(GetSize())
            {
                case 1:
                    return 1.00f;
                case 2:
                    return 1.55f;
                case 3:
                    return 1.99f;
                default:
                    return 0f;
            }
        }
    }

    abstract class Beverage
    {
        protected string _description = "Какое-то определение";
        private int _size = 1;

        public virtual string GetDescription()
        {
            return _description;
        }

        public virtual void SetSize(int size)
        {
            switch (size)
            {
                case 1:
                    _size = 1;
                    break;
                case 2:
                    _size = 2;
                    break;
                case 3:
                    _size = 3;
                    break;
            }
        }

        public virtual int GetSize()
        {
            return _size;
        }

        public abstract float Cost();
    }

    abstract class CondimentDecorator : Beverage
    {
        public abstract override string GetDescription();
    }
}