import chalk from "chalk";
import fs from "fs";
import json5 from "json5";

export interface ErrorWithCode {
	code: string;
}

export const convertCamelToUpperSnakeCase = (str: string) =>
	str.replace(/[A-Z]/g, (letter) => `_${letter}`).toUpperCase();

export const getTime = () => {
	const now = new Date(),
		tzo = -now.getTimezoneOffset(),
		dif = tzo >= 0 ? "+" : "-",
		pad = (num: number) => {
			const norm = Math.floor(Math.abs(num));
			return `${norm < 10 ? "0" : ""}${norm}`;
		};
	return [
		now.getFullYear(),
		"-",
		pad(now.getMonth() + 1),
		"-",
		pad(now.getDate()),
		"T",
		pad(now.getHours()),
		":",
		pad(now.getMinutes()),
		":",
		pad(now.getSeconds()),
		dif,
		pad(tzo / 60),
		":",
		pad(tzo % 60),
	].join("");
};

export const log = (...msg: unknown[]) =>
	console.log(`${chalk.grey(`${getTime()}:`)} ${msg}`);

export const readJsonIfExists = (filePath: string | URL) => {
	try {
		return json5.parse(fs.readFileSync(filePath, { encoding: "utf8" }));
	} catch (err) {
		// if no file, return empty object
		if ((err as ErrorWithCode)?.code === "ENOENT") return {};
		throw err;
	}
};