using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Threading;

///█ ■

////https://www.youtube.com/watch?v=SGZgvMwjq2U

namespace Snake

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WindowHeight = 16;

            Console.WindowWidth = 32;

            int screenwidth = Console.WindowWidth;

            int screenheight = Console.WindowHeight;

            Random randomnummer = new Random();

            int score = 5;

            int gameover = 0;

            pixel hoofd = new pixel();

            hoofd.xpos = screenwidth/2;

            hoofd.ypos = screenheight/2;

            hoofd.schermkleur = ConsoleColor.Red;

            string movement = "RIGHT";

            List<int> xposlijf = new List<int>();

            List<int> yposlijf = new List<int>();

            int berryx = randomnummer.Next(0, screenwidth);

            int berryy = randomnummer.Next(0, screenheight);

            DateTime tijd = DateTime.Now;

            DateTime tijd2 = DateTime.Now;

            string buttonpressed = "no";

            while (true)

            {

                Console.Clear();

                if (hoofd.xpos == screenwidth-1 || hoofd.xpos == 0 ||hoofd.ypos == screenheight-1 || hoofd.ypos == 0)

                { 

                    gameover = 1;

                }

                for (int i = 0;i< screenwidth; i++)

                {

                    Console.SetCursorPosition(i, 0);

                    Console.Write("■");

                }

                for (int i = 0; i < screenwidth; i++)

                {

                    Console.SetCursorPosition(i, screenheight -1);

                    Console.Write("■");

                }

                for (int i = 0; i < screenheight; i++)

                {

                    Console.SetCursorPosition(0, i);

                    Console.Write("■");

                }

                for (int i = 0; i < screenheight; i++)

                {

                    Console.SetCursorPosition(screenwidth - 1, i);

                    Console.Write("■");

                }

                Console.ForegroundColor = ConsoleColor.Green;

                if (berryx == hoofd.xpos && berryy == hoofd.ypos)

                {

                    score++;

                    berryx = randomnummer.Next(1, screenwidth-2);

                    berryy = randomnummer.Next(1, screenheight-2);

                } 

                for (int i = 0; i < xposlijf.Count(); i++)

                {

                    Console.SetCursorPosition(xposlijf[i], yposlijf[i]);

                    Console.Write("■");

                    if (xposlijf[i] == hoofd.xpos && yposlijf[i] == hoofd.ypos)

                    {

                        gameover = 1;

                    }

                }

                if (gameover == 1)

                {

                    break;

                }

                Console.SetCursorPosition(hoofd.xpos, hoofd.ypos);

                Console.ForegroundColor = hoofd.schermkleur;

                Console.Write("■");

                Console.SetCursorPosition(berryx, berryy);

                Console.ForegroundColor = ConsoleColor.Cyan;

                Console.Write("■");

                tijd = DateTime.Now;

                buttonpressed = "no";

                while (true)

                {

                    tijd2 = DateTime.Now;

                    if (tijd2.Subtract(tijd).TotalMilliseconds > 500) { break; }

                    if (Console.KeyAvailable)

                    {

                        ConsoleKeyInfo toets = Console.ReadKey(true);

                        //Console.WriteLine(toets.Key.ToString());

                        if (toets.Key.Equals(ConsoleKey.UpArrow) && movement != "DOWN" && buttonpressed == "no")

                        {

                            movement = "UP";

                            buttonpressed = "yes";

                        }

                        if (toets.Key.Equals(ConsoleKey.DownArrow) && movement != "UP" && buttonpressed == "no")

                        {

                            movement = "DOWN";

                            buttonpressed = "yes";

                        }

                        if (toets.Key.Equals(ConsoleKey.LeftArrow) && movement != "RIGHT" && buttonpressed == "no")

                        {

                            movement = "LEFT";

                            buttonpressed = "yes";

                        }

                        if (toets.Key.Equals(ConsoleKey.RightArrow) && movement != "LEFT" && buttonpressed == "no")

                        {

                            movement = "RIGHT";

                            buttonpressed = "yes";

                        }

                    }

                }

                xposlijf.Add(hoofd.xpos);

                yposlijf.Add(hoofd.ypos);

                switch (movement)

                {

                    case "UP":

                        hoofd.ypos--;

                        break;

                    case "DOWN":

                        hoofd.ypos++;

                        break;

                    case "LEFT":

                        hoofd.xpos--;

                        break;

                    case "RIGHT":

                        hoofd.xpos++;

                        break;

                }

                if (xposlijf.Count() > score)

                {

                    xposlijf.RemoveAt(0);

                    yposlijf.RemoveAt(0);

                }

            }

            Console.SetCursorPosition(screenwidth / 5, screenheight / 2);

            Console.WriteLine("Game over, Score: "+ score);

            Console.SetCursorPosition(screenwidth / 5, screenheight / 2 +1);

        }

        class pixel

        {

            public int xpos { get; set; }

            public int ypos { get; set; }

            public ConsoleColor schermkleur { get; set; }

        }

    }

}

//¦