AdventOfCode2022/Handlers/Day02.cs

namespace AdventOfCode2022.Handlers
{
    public class Day02
    {
        public enum GameResult
        {
            Loss = 0,
            Draw = 3,
            Win = 6
        }

        public enum Choice
        {
            Rock = 1,
            Paper = 2,
            Scissors = 3
        }

        string[] rounds;

        public Day02()
        {
            rounds = System.IO.File.ReadAllText(@"./days/02/input").Trim().Split("\n");
            PartA();
            // PartB();
        }

        private Choice ParseChoice(string input)
        {
            switch (input)
            {
                case "A":
                case "X":
                    return Choice.Rock;

                case "B":
                case "Y":
                    return Choice.Paper;

                case "C":
                case "Z":
                    return Choice.Scissors;

                default:
                    throw new Exception($"Invalid choice: {input}");
            }
        }

        private GameResult GetGameResult(Choice opponent, Choice you)
        {
            if (you == opponent)
            {
                return GameResult.Draw;
            }

            if (you == Choice.Rock && opponent == Choice.Scissors)
            {
                return GameResult.Win;
            }

            if (you == Choice.Paper && opponent == Choice.Rock)
            {
                return GameResult.Win;
            }

            if (you == Choice.Scissors && opponent == Choice.Paper)
            {
                return GameResult.Win;
            }

            return GameResult.Loss;
        }

        public void PartA()
        {
            var totalPoints = 0;

            foreach (var line in rounds)
            {
                var parts = line.Split(" ");
                var opponent = ParseChoice(parts[0]);
                var you = ParseChoice(parts[1]);
                var result = GetGameResult(opponent, you);

                var points = (int)you + (int)result;
                totalPoints += points;
                Console.WriteLine($"Opponent: {opponent}, You: {you}, Result: {result}, Points: {points}");
            }

            Console.WriteLine($"Total points: {totalPoints}");
        }

        public void PartB()
        {
            throw new NotImplementedException();
        }
    }
}