using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace _2018_02
{
    class Program
    {
        static void Main(string[] args)
        {
            int twos = 0, threes = 0;

            Dictionary<string, int> resCheck = new Dictionary<string, int>();
            string indata = File.ReadAllText(@"I:\Adventofcode_181201\data181202.txt");
            //string indata = "abcdef\r\nbababc\r\nabbcde\r\nabcccd\r\naabcdd\r\nabcdee\r\nababab\r\n";

            string[] resTab = indata.Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);

            foreach (var boxId in resTab)
            {
                char[] characters = boxId.ToArray();
                Array.Sort(characters);
                analyseString(characters, ref twos, ref threes);


            }

            System.Console.WriteLine($"twos: {twos} threes: {threes}  checksum: {twos * threes} ");

            SecondAnalyse(resTab);


        }


        private static void analyseString(char[] characters, ref int twos, ref int threes)
        {
            int locTwos = 0, locthrees = 0;
            char lastChar = ' ';
            byte cnt = 0;
            foreach (var tkn in characters)
            {
                if (tkn == lastChar)
                {
                    cnt++;
                }
                else
                {
                    if (cnt == 2)
                    {
                        if (locTwos == 0)
                            locTwos++;
                    }
                    if (cnt == 3)
                    {
                        if (locthrees == 0)
                        {
                            locthrees++;
                        }
                    }
                    lastChar = tkn;
                    cnt = 1;
                }
            }
            if (cnt == 2)
            {
                if (locTwos == 0)
                    locTwos++;
            }
            if (cnt == 3)
            {
                if (locthrees == 0)
                {
                    locthrees++;
                }
            }

            twos += locTwos;
            threes += locthrees;
        }

        private static void SecondAnalyse(string[] restab)
        {
            bool ready = false;
            var xlen = restab[0].Length;

            foreach (var str in restab)
            {
                for (int i = 0; i < xlen; i++)
                {
                    foreach (var str2 in restab)
                    {
                        if (str2 == str) { }
                        else
                        {
                            string stx = "", sty = "";
                            var st0 = stringUtanPos(str, i, out stx);
                            var st1 = stringUtanPos(str2, i, out sty);
                            if (st0 == st1)
                            {
                                System.Console.WriteLine($"box 1: {str},\r\nbox 2: {str2} diff chars {stx} , {sty}\r\n{st0}\r\n{st1}");
                                ready = true;
                                break;
                            }


                        }
                        if (ready) break;
                    }
                    if (ready) break;
                }
                if (ready) break;
            }



        }

        private static string stringUtanPos(string str, int i, out string stx)
        {
            string tmp = str;
            stx = str.Substring(i, 1);
            if (i > 0)
            {
                tmp = str.Substring(0, i) + str.Substring(i + 1);
            }
            else
            {
                tmp = str.Substring(i+1);
            }

            return tmp;
        }
    }
}