using System;
using System.Threading;

namespace sorting
{
    class MainClass
    {
        static int[,] inventory = new int[3, 3];
        static int cursor_x = 0, cursor_y = 0;

        public static void Main ( string [] args )
        {
            Console.CursorVisible = false;
            while ( true )
            {
                DrawInventory ();
                Input ();
            }
        }

        public static void Input ()
        {
            ConsoleKeyInfo keyInfo = Console.ReadKey ( true );

            if ( keyInfo.Key == ConsoleKey.UpArrow )
            {
                cursor_y = Clamp ( cursor_y - 1, 0, inventory.GetLength ( 1 ) - 1 );
            }
            else if ( keyInfo.Key == ConsoleKey.DownArrow )
            {
                cursor_y = Clamp ( cursor_y + 1, 0, inventory.GetLength ( 1 ) - 1 );
            }
            else if ( keyInfo.Key == ConsoleKey.LeftArrow )
            {
                cursor_x = Clamp ( cursor_x - 1, 0, inventory.GetLength ( 0 ) - 1 );
            }
            else if ( keyInfo.Key == ConsoleKey.RightArrow )
            {
                cursor_x = Clamp ( cursor_x + 1, 0, inventory.GetLength ( 0 ) - 1 );
            }

        }

        public static void DrawInventory ( int padding = 2 )
        {
            Console.BackgroundColor = ConsoleColor.Black;
            int lastSize = CanculateSize ( padding-1 );

            for ( int x = 0 ; x < inventory.GetLength ( 0 ) ; x++ )
            {
                for ( int y = 0 ; y < inventory.GetLength ( 1 ) ; y++ )
                {
                    if ( x == cursor_x && y == cursor_y )
                    {
                        Console.BackgroundColor = ConsoleColor.Red;
                    }
                    DrawBox ( x * lastSize, y * lastSize, padding, inventory [x, y].ToString () );
                    Console.BackgroundColor = ConsoleColor.Black;
                }
            }
        }

        public static int Clamp ( int value, int min, int max )
        {
            return value < min ? min : ( value > max ) ? max : value;
        }


        public static int CanculateSize ( int padding )
        {
            return 3 + padding + 2;
        }

        public static void DrawBox ( int _x, int _y, int padding, string number )
        {
            int size = CanculateSize ( padding );
            for ( int x = 0 ; x < size ; x++ )
            {
                for ( int y = 0 ; y < size ; y++ )
                {
                    if ( x == 0 || y == 0 || x == size - 1 || y == size - 1 )
                    {
                        Console.SetCursorPosition ( x + _x, y + _y );
                        Console.Write ( '#' );
                    }
                }
            }

            Console.SetCursorPosition ( ( _x + size / 2 ) - number.Length / 2, _y + size / 2 );
            Console.Write ( number );
        }
    }
}