namespace Lesson18_多线程练习
{
    enum E_Direction
    {
        Up,
        Down,
        Left,
        Right
    }
    struct Position
    {
        public int X;
        public int Y;
    }
    interface IDraw
    {
        public void Draw();
    }
    class Snake : IDraw
    {
        public E_Direction Direction;
        Position Position;
        public Snake()
        {
            Position.X = 15;
            Position.Y = 5;
            Direction = E_Direction.Right;
        }

        public void Move()
        {
            switch (this.Direction)
            {
                case E_Direction.Up:
                    Position.Y -= 1;
                    break;
                case E_Direction.Down:
                    Position.Y += 1;
                    break;
                case E_Direction.Left:
                    Position.X -= 2;
                    break;
                case E_Direction.Right:
                    Position.X += 2;
                    break;
                default:
                    break;
            }
        }
        public void Draw()
        {
            Console.SetCursorPosition(Position.X, Position.Y);
            Console.Write("■");
        }
        public void Clean()
        {
            Console.SetCursorPosition(Position.X, Position.Y);
            Console.Write(" ");
        }
        public void ChangeDirection(E_Direction direction)
        {
            this.Direction = direction;
        }
    }
    class Program
    {
        static Snake snake;
        static void Main(string[] args)
        {
            snake = new Snake();
            Console.CursorVisible = false;
            Thread inputThread = new Thread(input);
            inputThread.Start();
            while (true)
            {
                Thread.Sleep(500);
                snake.Clean();
                snake.Move();
                snake.Draw();
            }
            
        }
        static void input()
        {
            while (true)
            {
                switch(Console.ReadKey(true).Key)
                {
                    case ConsoleKey.UpArrow:
                        snake.ChangeDirection(E_Direction.Up);
                        break;
                    case ConsoleKey.DownArrow:
                        snake.ChangeDirection(E_Direction.Down);
                        break;
                    case ConsoleKey.LeftArrow:
                        snake.ChangeDirection(E_Direction.Left);
                        break;
                    case ConsoleKey.RightArrow:
                        snake.ChangeDirection(E_Direction.Right);
                        break;
                    default:
                        break;
                }
            }
        }
    }
}