AdventOfCode23/Day19/Data.cs

namespace Day19;

public record Data(IDictionary<string, Rule> Rules, IList<Part> Parts)
{
    public int Process()
    {
        var sum = 0;
        foreach (var part in Parts)
        {
            Console.WriteLine(part);
            var next = "in";
            while (next != "A" && next != "R")
            {
                var rule = Rules[next];
                next = rule.Apply(part);
            }

            if (next == "A")
            {
                sum += part.Total;
                Console.WriteLine("ACCEPTED");
            }
            else
            {
                Console.WriteLine("REJECTED");
            }
        }

        return sum;
    }

    public long ComputePermutations()
    {
        var sum = 0L;
        var queue = new Queue<RuleResultRange>();
        queue.Enqueue(new RuleResultRange(new PartRange(), "in"));
        
        while (queue.Count > 0)
        {
            var current = queue.Dequeue();
            Console.WriteLine($"Applying {current.Next} to {current.Part}");

            var next = current.Next!;
            if (next == "A")
            {
                sum += current.Part.Total();
                Console.WriteLine("ACCEPTED");
            }
            else if (next == "R")
            {
                Console.WriteLine("REJECTED");
            }
            else
            {
                var rule = Rules[next];

                foreach (var r in rule.Apply(current.Part))
                {
                    queue.Enqueue(r);
                }
            }
        }

        return sum;
    }
}