using System;
using System.IO;

namespace Day02CSharp
{
    internal class Program
    {
        enum Hand
        {
            Rock = 1, Paper = 2, Scissors = 3
        }

        static Hand GetHand(int i)
        {
            switch (i)
            {
                case 1:
                    return Hand.Rock;
                case 2:
                    return Hand.Paper;
                case 3:
                    return Hand.Scissors;
                default:
                    throw new ArgumentOutOfRangeException();
            }
        }

        static int GetScore(Hand left, Hand right)
        {
            if (left == right) return 3;

            if (    left == Hand.Rock && right == Hand.Paper
                ||  left == Hand.Paper && right == Hand.Scissors
                ||  left == Hand.Scissors && right == Hand.Rock
                ) { return 6; }

            return 0;
        }

        static int GetBeater(Hand h)
        {
            switch (h)
            {
                case Hand.Rock: return (int)Hand.Paper;
                case Hand.Scissors: return (int)Hand.Rock;
                case Hand.Paper: return (int)Hand.Scissors;
                default: throw new ArgumentOutOfRangeException();
            }
        }

        static int GetLoser(Hand h)
        {
            switch (h)
            {
                case Hand.Rock: return (int)Hand.Scissors;
                case Hand.Scissors: return (int)Hand.Paper;
                case Hand.Paper: return (int)Hand.Rock;
                default: throw new ArgumentOutOfRangeException();
            }
        }

        static void Main(string[] args)
        {
            Part01();
            Part02();
        }

        private static void Part01()
        {
            var fileName = @"data\input.txt";
            int currentScore = 0;

            using (StreamReader reader = File.OpenText(fileName))
            {
                while (!reader.EndOfStream)
                {
                    string line = reader.ReadLine();
                    var split = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
                    if (split.Length == 2)
                    {
                        int enemy = split[0][0] - 'A' + 1;
                        int yours = split[1][0] - 'X' + 1;

                        // Add in selected shape
                        currentScore += yours;
                        currentScore += GetScore(GetHand(enemy), GetHand(yours));
                    }
                }
            }

            Console.WriteLine(currentScore);
        }

        private static void Part02()
        {
            var fileName = @"data\input.txt";
            int currentScore = 0;

            using (StreamReader reader = File.OpenText(fileName))
            {
                while (!reader.EndOfStream)
                {
                    string line = reader.ReadLine();
                    var split = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
                    if (split.Length == 2)
                    {
                        int enemy = split[0][0] - 'A' + 1;
                        int yours = split[1][0];                        

                        switch (yours)
                        {
                            case 'X': // lose
                                currentScore += GetLoser(GetHand(enemy));
                                break;
                            case 'Y': // draw
                                currentScore += enemy + 3;
                                break;
                            case 'Z': // win
                                currentScore += GetBeater(GetHand(enemy)) + 6;
                                break;
                            default:
                                throw new ArgumentOutOfRangeException();

                        }

                    }
                }
            }

            Console.WriteLine(currentScore);
        }
    }
}