import { readFile } from "fs/promises";

if (process.argv.length <= 2) {
	console.error(`Needs more args >:(`).
	process.exit(0);
}

const fileToRead = process.argv[2];
const file = await readFile(fileToRead, `utf-8`);

const pattern = /(?<cmd>mul|do|don't)\(((?<a>\d{1,3}),(?<b>\d{1,3}))?\)/g;

const commands = file.matchAll(pattern);

let part1Sum = 0;
let part2Sum = 0;
let enabled = true
for (const command of commands) {
	const { cmd, a, b } = command.groups;

	switch (cmd) {
		case "do": enabled = true; break
		case "don't": enabled = false; break
		case "mul": {
			part1Sum += a * b;
			if (enabled) {
				part2Sum += a * b;
			}
			break;
		}
	}
};

console.log(`Part 1 Answer: ${part1Sum}`);
console.log(`Part 2 Answer: ${part2Sum}`);