AoC_2016_DayTwelve

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

namespace AdventOfCode_Solutions
{
    class DayTwelve_2
    {
        public static List<Register> registers;

        internal static void Run()
        {
            string[] fileLines = File.ReadAllLines(Path.Combine(Directory.GetCurrentDirectory(), "DayTwelve_Instructions.txt"));
            List<List<string>> instructions = new List<List<string>>();
            foreach (string line in fileLines)
            {
                instructions.Add(new List<string>());
                foreach (string part in line.Split(' '))
                {
                    instructions[instructions.Count - 1].Add(part);
                }
            }

            registers = new List<Register>();

            registers.Add(new Register('a'));
            registers.Add(new Register('b'));
            registers.Add(new Register('c'));
            registers.Add(new Register('d'));

            int index = 0;
            while (index < instructions.Count)
            {
                switch (instructions[index][0])
                {
                    case "cpy":
                        int holder;
                        if (int.TryParse(instructions[index][1], out holder))
                        {
                            Register.FindByID(instructions[index][2][0]).Set(holder);
                        }
                        else
                        {
                            Register.FindByID(instructions[index][2][0]).Set(Register.FindByID(instructions[index][1][0]).value);
                        }
                        index++;
                        break;

                    case "jnz":
                        int holder2;
                        if (int.TryParse(instructions[index][1], out holder2))
                        {
                            if (holder2 != 0)
                            {
                                index += int.Parse(instructions[index][2]);
                            }
                            else
                            {
                                index++;
                            }
                        }
                        else
                        {
                            if (Register.FindByID(instructions[index][1][0]).value != 0)
                            {
                                index += int.Parse(instructions[index][2]);
                            }
                            else
                            {
                                index++;
                            }
                        }

                        break;

                    case "inc":
                        Register.FindByID(instructions[index][1][0]).value++;
                        index++;
                        break;

                    case "dec":
                        Register.FindByID(instructions[index][1][0]).value--;
                        index++;
                        break;
                }
                Console.WriteLine("a:" + Register.FindByID('a').value + " b:" + Register.FindByID('b').value + " c:" + Register.FindByID('c').value + " d:" + Register.FindByID('d').value);
            }
            Console.WriteLine(Register.FindByID('a').value);
        }

        public class Register
        {
            public char id;
            public int value;

            public Register(char id)
            {
                this.id = id;
                if (id == 'c')
                {
                    value = 1;
                }
                else
                {
                    value = 0;
                }
            }

            public void Increment()
            {
                value++;
            }

            public void Set(int value)
            {
                this.value = value;
            }

            public static Register FindByID(char id)
            {
                foreach (Register register in registers)
                {
                    if (register.id == id)
                    {
                        return register;
                    }
                }
                return null;
            }
        }
    }
}