using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Emit;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;

namespace Advent24
{
    internal class Day3
    {
        public Day3()
        {
            string fileData = System.IO.File.ReadAllText(@"..\..\..\inputd3.txt");

            string pattern = @"((mul\((?<Multiplicand>\d+),(?<Multiplier>\d+)\))|(do\(\))|(don't\(\)))";

            Regex r = new(pattern, RegexOptions.None, TimeSpan.FromMilliseconds(150));

            Match m = r.Match(fileData);

            Int32 productSum = 0;

            Boolean mulAlwaysEnabled = false;

            Boolean mulEnabled = true;

            while (m.Success)
            {
                // do() matched
                if (m.Groups[3].Success)
                {
                    mulEnabled = true;
                    Console.WriteLine("mulEnabled = {0:s}", mulEnabled);
                }
                // don't() matched
                else if (m.Groups[4].Success)
                {
                    mulEnabled = false;
                    Console.WriteLine("mulEnabled = {0:s}", mulEnabled);
                }
                // neither do() nor don't() matched
                else
                {
                    if (mulEnabled || mulAlwaysEnabled)
                    {
                        productSum += System.Convert.ToInt32(m.Groups["Multiplicand"].Value) * System.Convert.ToInt32(m.Groups["Multiplier"].Value);
                        Console.WriteLine("{0:s} * {1:s}", m.Groups["Multiplicand"].Value, m.Groups["Multiplier"].Value);
                    }
                }
                // look at the next match
                m = m.NextMatch();
            }

            Console.WriteLine("productSum = {0:d}", productSum);

            // to keep the console window from closing
            Console.ReadKey();
        }
    }
}