import { DateTime } from "luxon";

export function timestampToReadable(timestamp?: number): string {
	const date: Date =
		timestamp && !isNaN(timestamp) ? new Date(timestamp) : new Date();
	if (isNaN(date.getTime())) return "Invalid Date";
	return date.toISOString().replace("T", " ").replace("Z", "");
}

export function isUUID(uuid: string): boolean {
	const regex: RegExp =
		/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/;

	return regex.test(uuid);
}

export function getNewTimeUTC(
	durationStr: string,
	from: DateTime = DateTime.utc(),
): string | null {
	const duration: DurationObject = parseDuration(durationStr);

	const newTime: DateTime = from.plus({
		years: duration.years,
		months: duration.months,
		weeks: duration.weeks,
		days: duration.days,
		hours: duration.hours,
		minutes: duration.minutes,
		seconds: duration.seconds,
	});

	return newTime.toSQL({ includeOffset: false });
}

export function parseDuration(input: string): DurationObject {
	const regex: RegExp = /(\d+)(y|mo|w|d|h|m|s)/g;
	const matches: RegExpMatchArray[] = [...input.matchAll(regex)];

	const duration: DurationObject = {
		years: 0,
		months: 0,
		weeks: 0,
		days: 0,
		hours: 0,
		minutes: 0,
		seconds: 0,
	};

	for (const match of matches) {
		const value: number = parseInt(match[1], 10);
		const unit: string = match[2];

		switch (unit) {
			case "y":
				duration.years = value;
				break;
			case "mo":
				duration.months = value;
				break;
			case "w":
				duration.weeks = value;
				break;
			case "d":
				duration.days = value;
				break;
			case "h":
				duration.hours = value;
				break;
			case "m":
				duration.minutes = value;
				break;
			case "s":
				duration.seconds = value;
				break;
		}
	}

	return duration;
}

export function isValidTimezone(timezone: string): boolean {
	return DateTime.local().setZone(timezone).isValid;
}

export function generateRandomString(length?: number): string {
	if (!length) {
		length = length || Math.floor(Math.random() * 10) + 5;
	}

	const characters: string =
		"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
	let result: string = "";

	for (let i: number = 0; i < length; i++) {
		result += characters.charAt(
			Math.floor(Math.random() * characters.length),
		);
	}

	return result;
}