SnakeFood1a

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

namespace Snake1a
{

    struct Point
    {
        public int x, y;
        public Point(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
    }

    class Program
    {
        public enum Direction { Up, Down, Left, Right };

        static void Main(string[] args)
        {
//            Point a = new Point(10,10);

//            Point b = a;
//            b.x = 15;
//            b.y = 20;
//            Console.WriteLine("a point has x = {0} y = {1}", a.x, a.y);
//            Console.WriteLine("b point has x = {0} y = {1}", b.x, b.y);
//            return;

            ConsoleKeyInfo cki;
            int positionX = 0;
            int positionY = 0;

            Queue<Point> snake = new Queue<Point>();

            for (var i = 0; i < 5; i++) {
                snake.Enqueue(new Point(i, 0));
            }

            // or
            // Point[] snake = new Point[100];

//            int position1X = 0;
//            int position1Y = 1;

            Direction direction = Direction.Right;
            char symbol = '>';

            Point segment, head, newHead = new Point(0,0), food;

            Random randomNumber = new Random();

            food = new Point(
                randomNumber.Next(0, Console.WindowWidth - 1),
                randomNumber.Next(0, Console.WindowHeight - 1));



            do
            {
                //1. the endles llop of the life
                while (!Console.KeyAvailable)
                {
                    head = snake.Last();
                    // my world!!! is here
                    switch (direction)
                    {
                        case Direction.Down:
                            // if (positionY < Console.WindowHeight) positionY++;
                            // if (positionY == Console.WindowHeight - 1) positionY = 0;
                            // positionY++;
                            if (head.y == Console.WindowHeight - 1) newHead = new Point(head.x, 0);
                            else newHead = new Point(head.x, head.y + 1);
                            symbol = 'V';
                            break;
                        case Direction.Up:
                            // if (positionY > 0) positionY--;
                            // if (positionY == 0) positionY = Console.WindowHeight - 1;
                            // positionY--;
                            if (head.y == 0) newHead = new Point(head.x, Console.WindowHeight - 1);
                            else newHead = new Point(head.x, head.y - 1);
                            symbol = '^';
                            break;
                        case Direction.Left:
                            // if (positionX > 0) positionX--;
                            // if (positionX == 0) positionX = Console.WindowWidth - 1;
                            // positionX--;
                            if (head.x == 0) newHead = new Point(Console.WindowWidth - 1, head.y);
                            else newHead = new Point(head.x - 1, head.y);
                            symbol = '<';
                            break;
                        case Direction.Right:
                            // if (positionX < Console.WindowWidth - 1) positionX++;
                            // if (positionX == Console.WindowWidth - 1) positionX = 0;
                            // positionX++;
                            if (head.x == Console.WindowWidth - 1) newHead = new Point(0, head.y);
                            else newHead = new Point(head.x + 1, head.y);
                            symbol = '>';
                            break;
                    }
                    Console.Clear();
                    snake.Enqueue(newHead);

                    if (food.x == newHead.x && food.y == newHead.y) {
                        do {
                            food = new Point(
                                 randomNumber.Next(0, Console.WindowWidth - 1),
                                 randomNumber.Next(0, Console.WindowHeight - 1));
                        } while(snake.Contains(food));
                    }
                    else
                    {
                        snake.Dequeue();
                    }

                    Console.ForegroundColor = ConsoleColor.Yellow;
                    Console.SetCursorPosition(food.x, food.y);
                    Console.Write("@");

//                    Console.SetCursorPosition(positionX, positionY);
                    Console.ForegroundColor = ConsoleColor.Green;
                    // Console.BackgroundColor = ConsoleColor.Blue;
//                    Console.Write(symbol);
                    for (var i = 0; i < snake.Count; i++) {
                        segment = snake.ElementAt(i);
                        Console.SetCursorPosition(segment.x, segment.y);
                        if (i == snake.Count - 1)
                        {
                            Console.Write(symbol);
                        }
                        else
                        {
                            Console.Write("*");
                        }
                    }

                        // Console.WriteLine("Endless loop!");
                        System.Threading.Thread.Sleep(150);
                }
                // If I am out of my loop there was an Event
                // Take care of the event
                cki = Console.ReadKey(true);
                switch (cki.Key) {
                    case ConsoleKey.RightArrow :
                        // if (positionX < Console.WindowWidth -1) positionX++;
                        direction = Direction.Right;
                        break;
                    case ConsoleKey.LeftArrow:
                        // if (positionX > 0) positionX--;
                        direction = Direction.Left;
                        break;
                    case ConsoleKey.UpArrow:
                        // if (positionY > 0) positionY--;
                        direction = Direction.Up;
                        break;
                    case ConsoleKey.DownArrow:
                        // if (positionY < Console.WindowHeight) positionY++;
                        direction = Direction.Down;
                        break;
                }


            } while (cki.Key != ConsoleKey.Escape);
        }
    }
}