Adv2016/D21.2/Program.cs

using D21._1;
using static D21._1.Program;
using System;
using System.IO;
using System.Linq;

namespace D21._2
{
    class Program
    {
        static void Main(string[] args)
        {
            var scrambling = "fbgdceah".ToCharArray();

            using (var f = new R(File.OpenText(args[0]).BaseStream))
            {
                var file = f.ReadToEnd().Split(new [] { "\n", "\r\n" }, StringSplitOptions.RemoveEmptyEntries).Reverse();
                foreach (string line in file)
                {
                    if (line.StartsWith("swap position "))
                    {
                        var i = int.Parse(line.Split(" ")[2]);
                        var j = int.Parse(line.Split(" ")[5]);
                        scrambling = Swap(scrambling, i, j);
                    }
                    else if (line.StartsWith("swap letter "))
                    {
                        var i = line.Split(" ")[2][0];
                        var j = line.Split(" ")[5][0];
                        scrambling = Swap(scrambling, i, j);
                    }
                    else if (line.StartsWith("rotate right "))
                    {
                        var i = int.Parse(line.Split(" ")[2]);
                        scrambling = RotateLeft(scrambling, i);
                    }
                    else if (line.StartsWith("rotate left "))
                    {
                        var i = int.Parse(line.Split(" ")[2]);
                        scrambling = RotateRight(scrambling, i);
                    }
                    else if (line.StartsWith("rotate based on position of letter "))
                    {
                        var index = IndexOf(scrambling, line.Last());
                        if (index == -1) throw new Exception();
                        var scramblingS = scrambling.Clone() as char[];
                        while (Rotate(scrambling, line.Last()).SequenceEqual(scramblingS) == false)
                            scrambling = RotateLeft(scrambling, 1);
                    }
                    else if (line.StartsWith("reverse positions "))
                    {
                        var i = int.Parse(line.Split(" ")[2]);
                        var j = int.Parse(line.Split(" ")[4]);
                        scrambling = Reverse(scrambling, i, j);
                    }
                    else if (line.StartsWith("move position "))
                    {
                        var i = int.Parse(line.Split(" ")[2]);
                        var j = int.Parse(line.Split(" ")[5]);
                        scrambling = Move(scrambling, j, i);
                    }
                }
            }

            Console.WriteLine(scrambling);
        }
    }
}