import path from "path";
import os from "os";

const getFilesTrace = () => {
	const regex =
		os.platform() === "win32"
			? /[A-Z]:(\\|\/).*\.(m?)js/gm
			: /(?<=file:\/\/).*\.(m?)js/gm;

	return new Error().stack?.match(regex);
};

const getDayData = () => {
	const dirs = getFilesTrace()?.map(file =>
		path.parse(file).dir.split(/\\|\//),
	);

	const dayDir = dirs?.find(chunks =>
		/^day\d\d$/.test(chunks[chunks.length - 1]),
	);

	if (!dayDir) {
		return {
			year: null,
			day: null,
			inputFile: null,
		};
	}

	const distPos = dayDir?.lastIndexOf("dist");

	if (distPos !== -1) {
		dayDir[distPos] = "src";
	}

	return {
		year: Number(dayDir[dayDir.length - 2]),
		day: Number(dayDir[dayDir.length - 1].slice(-2)),
		inputFile: [...dayDir, "input.txt"].join(path.sep),
	};
};

export default getDayData;