using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace Kalender
{
    internal class day9_part1
    {
        static string file = "../../../Kalender/files/day9.txt";
        static string[] lines = File.ReadAllLines(file);

        static int rows = 20;
        static int column = 20;
        static string[,] field = new string[rows, column];
        
        
        static public void create2DArray()
        {


            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < column; j++)
                {
                    field[i, j] = "[ ]";
                }
            }
        }

        static public void fieldPrint()
        {
            //Start
            int counter = 0;
            for (int i = 0; i < rows; i++)
            {
                for (var j = 0; j < column; j++)
                {
                    Console.Write(field[i, j]);
                    if (field[i, j] == "[#]")
                    {
                        counter++;
                    }
                }
                Console.Write("\n");
            }
            Console.WriteLine($"Tails {counter}");
        }
        static public void moveTail(int xx, int yy, char direction, int steps)
        {
            int x = xx;
            int y = yy;

            field[x, y] = "[#]";
            for (int i = 0; i < steps; i++)
            {
                switch (direction)
                {
                    case 'R':
                        y ++;
                        break;
                    case 'L':
                        y --;
                        break;
                    case 'U':
                        x--;
                        break;
                    case 'D':
                        x++;
                        break;
                }
                field[x, y] = "[#]";
            }


        }
        static public void day9_01()
        {
            create2DArray();
            int currentPosx = rows /2;
            int currentPosy = column / 2;
            int tailx = 0;
            int taily = 0;
            int step = 0;
            field[currentPosx, currentPosy] = "[S]";
            foreach (var line in lines)
            {
                step = Convert.ToInt16(line.Substring(2));
                moveTail(currentPosx, currentPosy, line[0], step);
                int headx = 0;
                int heady = 0;
                switch (line[0]) { 
                    case 'R':
                        heady = step;
                        currentPosy += heady;
                        break;
                    case 'L':
                        heady = step;
                        currentPosy -= heady;
                        break;
                    case 'U':
                        headx = step;
                        currentPosx -= headx;
                        break;
                    case 'D':
                        headx = step;
                        currentPosx += headx;
                        break;
                
                }
                field[currentPosx, currentPosy] = "[H]";
                
            }

            fieldPrint();
        }
             
    }

    class day9_part2
    {

    }
}