Adv2015/D16.2/Program.cs

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

namespace D16._2
{
    public class Sue
    {
        public int Id { get; }

        public Dictionary<string, int> Things = new Dictionary<string, int>();

        public Sue(int id) => Id = id;

        public override bool Equals(object obj) => obj is Sue sue && Id == sue.Id;

        public override int GetHashCode() => HashCode.Combine(Id);
    }
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length < 1) throw new ArgumentException();
            if (File.Exists(args[0]) == false) throw new FileNotFoundException();

            List<Sue> sues = new List<Sue>();
            Dictionary<string, (int, string)> thingInLetter = new Dictionary<string, (int, string)>
            {
                { "children", (3, "eq") },
                { "cats", (7, "gt") },
                { "samoyeds", (2, "eq") },
                { "pomeranians", (3, "lt") },
                { "akitas", (0, "eq") },
                { "vizslas", (0, "eq") },
                { "goldfish", (5, "lt") },
                { "trees", (3, "gt") },
                { "cars", (2, "eq") },
                { "perfumes", (1, "eq") }
            };

            ParseFile(args[0], sues);

            HashSet<Sue> possibleSues = new HashSet<Sue>();

            FindSue(sues, thingInLetter, possibleSues);

            if (possibleSues.Count > 1) throw new Exception();

            Console.WriteLine($"I may send my card to Aunt Sue {possibleSues.First().Id}");
        }

        private static void FindSue(List<Sue> sues, Dictionary<string, (int, string)> thingInLetter, HashSet<Sue> possibleSues)
        {
            foreach (var sue in sues)
            {
                bool mayBeThatSue = true;
                foreach ((string key, (int value, string op) thing) in thingInLetter)
                {
                    if (sue.Things.ContainsKey(key) == false)
                        continue;

                    if ((thing.op == "gt" && sue.Things[key] <= thing.value) ||
                        (thing.op == "lt" && sue.Things[key] >= thing.value) ||
                        (thing.op == "eq" && sue.Things[key] != thing.value))
                    {
                        mayBeThatSue = false;
                        break;
                    }
                }

                if (mayBeThatSue) possibleSues.Add(sue);
            }
        }

        private static void ParseFile(string arg, List<Sue> sues)
        {
            using (var file = File.OpenText(arg))
            {
                while (true)
                {
                    var line = file.ReadLine();
                    if (line == null) break;

                    var lr = line.Split(": ", 2);
                    var id = int.Parse(lr[0].Substring("Sue ".Length));
                    var sue = new Sue(id);

                    foreach (var thing in lr[1].Split(", "))
                    {
                        var thinglr = thing.Split(": ");
                        int qt = int.Parse(thinglr[1]);
                        sue.Things.Add(thinglr[0], qt);
                    }

                    sues.Add(sue);
                }
            }
        }
    }
}