AdventOfCode23/Day19/PartRange.cs

namespace Day19;

public class PartRange
{
    private readonly IDictionary<string, Range> _dict;
    
    public PartRange()
    {
        _dict = new Dictionary<string, Range>
        {
            ["x"] = new Range(1, 4000),
            ["m"] = new Range(1, 4000),
            ["a"] = new Range(1, 4000),
            ["s"] = new Range(1, 4000),
        };
    }
    
    private PartRange(PartRange original)
    {
        _dict = new Dictionary<string, Range>(original._dict);
    }

    public Range Get(string property)
    {
        return _dict[property];
    }

    public PartRange Update(string property, Range range)
    {
        var copy = new PartRange(this);
        copy._dict[property] = range;
        return copy;
    }

    public long Total()
    {
        return Get("x").Size
               * Get("m").Size
               * Get("a").Size
               * Get("s").Size;
    }

    public override string ToString()
    {
        return $"x = {Get("x")}, m = {Get("m")}, a = {Get("a")}, s = {Get("s")}, ";
    }
}