JustSnakeGame

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

namespace JustSnake
{
    struct Position
    {
    public int row;
    public int col;
    public Position(int row, int col)
        {
            this.row = row;
            this.col = col;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Position[] directions = new Position[]
            {
                new Position(0, 1),      // right
                new Position(0, -1),     // left
                new Position(1, 0),     // down
                new Position(-1, 0),     // top

            };
            int sleepTime = 100;
            int direction = 0; // 0
            Random randomnumbersGenerator = new Random();
            Console.BufferHeight = Console.WindowHeight;
            Position food = new Position(randomnumbersGenerator.Next(0, Console.WindowHeight), randomnumbersGenerator.Next(0, Console.WindowWidth));


            Queue<Position> snakeElements = new Queue<Position>();
            for (int i = 0; i <= 5; i++)
            {
                snakeElements.Enqueue(new Position(0, i));
            }

            while (true)
            {
                if (Console.KeyAvailable)
                {
                    ConsoleKeyInfo userInput = Console.ReadKey();
                    if (userInput.Key == ConsoleKey.LeftArrow)
                    {
                        direction = 1;
                    }
                    if (userInput.Key == ConsoleKey.RightArrow)
                    {
                        direction = 0;
                    }
                    if (userInput.Key == ConsoleKey.UpArrow)
                    {
                        direction = 3;
                    }
                    if (userInput.Key == ConsoleKey.DownArrow)
                    {
                        direction = 2;
                    }
                    // 0,1,2,3 индексирани от масива
                }

                Position snakeHead = snakeElements.Last();
                Position nextDirection = directions[direction];
                Position snakeNewHead = new Position(snakeHead.row + nextDirection.row, snakeHead.col + nextDirection.col);
                if (snakeNewHead.row < 0 ||
                    snakeNewHead.col < 0 ||
                    snakeNewHead.row >= Console.WindowHeight ||
                    snakeNewHead.col >= Console.WindowWidth ||
                    snakeElements.Contains(snakeNewHead))
                {
                    Console.SetCursorPosition(0, 0);
                    Console.WriteLine("Game over");
                    Console.WriteLine("Your points are: {0}", ((snakeElements.Count-6) * 100));
                    return; // приключва изпълнението на текущата функция - ще свърши програмата
                }

                snakeElements.Enqueue(snakeNewHead);
                if (snakeNewHead.col == food.col && snakeNewHead.row == food.row)
                {
                    // feeding snake - може да забързваме тук змията
                    food = new Position(randomnumbersGenerator.Next(0, Console.WindowHeight), randomnumbersGenerator.Next(0, Console.WindowWidth));
                    sleepTime--;

                }
                else
                {
                    // moving ...
                    snakeElements.Dequeue();
                }

                Console.Clear();
                foreach (Position position in snakeElements)
                {
                    Console.SetCursorPosition(position.col, position.row);
                    Console.WriteLine("*");
                }

                Console.SetCursorPosition(food.col, food.row);
                Console.WriteLine("@");

                Thread.Sleep(sleepTime);
            }
        }
    }
}