using System;

using System.Collections.Generic;

using System.Threading.Tasks;

​

namespace AsyncBreakfast

{

    class Program

    {

        static async Task Main(string[] args)

        {

            Coffee cup = PourCoffee();

            Console.WriteLine("coffee is ready");

​

            var eggsTask = FryEggsAsync(2);

            var baconTask = FryBaconAsync(3);

            var toastTask = MakeToastWithButterAndJamAsync(2);

​

            var breakfastTasks = new List<Task> { eggsTask, baconTask, toastTask };

            while (breakfastTasks.Count > 0)

            {

                Task finishedTask = await Task.WhenAny(breakfastTasks);

                if (finishedTask == eggsTask)

                {

                    Console.WriteLine("eggs are ready");

                }

                else if (finishedTask == baconTask)

                {

                    Console.WriteLine("bacon is ready");

                }

                else if (finishedTask == toastTask)

                {

                    Console.WriteLine("toast is ready");

                }

                breakfastTasks.Remove(finishedTask);

            }

​

            Juice oj = PourOJ();

            Console.WriteLine("oj is ready");

            Console.WriteLine("Breakfast is ready!");

        }

​

        class Coffee{}

        class Toast{}

        class Juice{}

        class Bacon{}

        class Egg{}

        static async Task<Toast> MakeToastWithButterAndJamAsync(int number)

        {

            var toast = await ToastBreadAsync(number);

            ApplyButter(toast);

            ApplyJam(toast);

​

            return toast;

        }

​

        private static Juice PourOJ()

        {

            Console.WriteLine("Pouring orange juice");

            return new Juice();

        }

​

        private static void ApplyJam(Toast toast) =>

            Console.WriteLine("Putting jam on the toast");

​

        private static void ApplyButter(Toast toast) =>

            Console.WriteLine("Putting butter on the toast");

​

        private static async Task<Toast> ToastBreadAsync(int slices)

        {

            for (int slice = 0; slice < slices; slice++)

            {

                Console.WriteLine("Putting a slice of bread in the toaster");

            }

            Console.WriteLine("Start toasting...");

            await Task.Delay(3000);

            Console.WriteLine("Remove toast from toaster");

​

            return new Toast();

        }

​

        private static async Task<Bacon> FryBaconAsync(int slices)

        {

            Console.WriteLine($"putting {slices} slices of bacon in the pan");

            Console.WriteLine("cooking first side of bacon...");

            await Task.Delay(3000);

            for (int slice = 0; slice < slices; slice++)

            {

                Console.WriteLine("flipping a slice of bacon");

            }

            Console.WriteLine("cooking the second side of bacon...");

            await Task.Delay(3000);

            Console.WriteLine("Put bacon on plate");

​

            return new Bacon();

        }

​

        private static async Task<Egg> FryEggsAsync(int howMany)

        {

            Console.WriteLine("Warming the egg pan...");

            await Task.Delay(3000);

            Console.WriteLine($"cracking {howMany} eggs");

            Console.WriteLine("cooking the eggs ...");

            await Task.Delay(3000);

            Console.WriteLine("Put eggs on plate");

            return new Egg();

        }

​

        private static Coffee PourCoffee()

        {

            Console.WriteLine("Pouring coffee");

            return new Coffee();

        }

    }

}