using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp4
{
    class Program
    {
        const int BALLS_COUNT = 19;
        
        static void Main(string[] args)
        {
            Console.CursorVisible = false;
            int balls = 0;
            int selected = 0;
            int bucketNumber = 1;
            int count = BALLS_COUNT;
            ConsoleKeyInfo key;
            do
            {
                Console.SetCursorPosition(0, 0);
                Console.WriteLine($"Bucket #{bucketNumber}:");
                PrintBalls(balls, selected);
                key = Console.ReadKey(true);
                switch (key.Key)
                {
                    case ConsoleKey.Enter when count > 0:
                        balls = TakeBall(balls, selected);
                        bucketNumber++;
                        count--;
                        if (selected >= count) selected = count - 1;
                        break;
                    case ConsoleKey.UpArrow when selected > 0:
                        selected--;
                        break;
                    case ConsoleKey.DownArrow when selected < count - 1:
                        selected++;
                        break;
                }

            } while (key.Key != ConsoleKey.Escape && count > 0);
            Console.Clear();
            Console.WriteLine($"Press any key to contine...");
            Console.ReadKey(true);
        }

        static void PrintBalls(int balls, int selectedIndex)
        {
            var ballsEnum = GetBalls(balls);
            int index = 0;
            foreach (var ballIndex in ballsEnum)
            {
                if (index == selectedIndex)
                {
                    Console.BackgroundColor = ConsoleColor.Green;
                    Console.ForegroundColor = ConsoleColor.Black;
                }
                Console.WriteLine($"\t{ballIndex + 1}\t");
                Console.ForegroundColor = ConsoleColor.Gray;
                Console.BackgroundColor = ConsoleColor.Black;
                index++;
            }
            Console.WriteLine($"\t\t");
        }

        static int TakeBall(int balls, int selectedIndex)
        {
            var realIndex = GetBalls(balls).Skip(selectedIndex).Take(1).First();
            return balls | 1 << realIndex;
        }

        static IEnumerable<int> GetBalls(int balls)
        {
            for(int index = 0; index < BALLS_COUNT; index++)
            {
                var value = balls >> index & 1;
                if (value == 0)
                {
                    yield return index;
                }
            }
        }        
    }
}