import { appendFileSync, existsSync } from 'fs';

const filename = 'logs.csv',
	fileExist = existsSync(filename);

console.log(filename, fileExist);

if (!fileExist) appendFileSync(filename, ['Date', 'Method', 'Domain', 'Path', 'Status'].join(',') + '\n', 'utf8');

export const log = (method: string, response: Response) => {
	const { url, status } = response,
		{ host, pathname } = new URL(url);
	appendFileSync(filename, [isoDateInTimeZone(), method, host, pathname, status].join(',') + '\n', 'utf8');
};

function isoDateInTimeZone(timeZone = 'America/Buenos_Aires', date = new Date()) {
	const parts = new Intl.DateTimeFormat("en-CA", {
		timeZone,
		year: "numeric",
		month: "2-digit",
		day: "2-digit",
		hour: "2-digit",
		minute: "2-digit",
		second: "2-digit",
		fractionalSecondDigits: 3,
		hour12: false,
		timeZoneName: "shortOffset",
	}).formatToParts(date),
		map = Object.fromEntries(parts.map(p => [p.type, p.value])),
		offset = map.timeZoneName.replace("GMT", "");

	return `${map.year}-${map.month}-${map.day}T` +
		`${map.hour}:${map.minute}:${map.second}.` +
		`${map.fractionalSecond}${offset}`;
}