export function relativeTime(date: Date | string, now: number) {
	const elapsed = Math.max(0, Math.floor((now - new Date(date).getTime()) / 1000));
	if (elapsed < 5) return 'just now';
	const units: [number, string][] = [
		[31_536_000, 'year'],
		[2_592_000, 'month'],
		[604_800, 'week'],
		[86_400, 'day'],
		[3_600, 'hour'],
		[60, 'minute'],
		[1, 'second']
	];
	for (const [seconds, unit] of units) {
		if (elapsed >= seconds) {
			const count = Math.floor(elapsed / seconds);
			return `${count === 1 ? (unit === 'hour' ? 'an' : 'a') : count} ${unit}${count === 1 ? '' : 's'} ago`;
		}
	}
	return 'just now';
}

const dateFormatter = new Intl.DateTimeFormat('en', { dateStyle: 'long', timeZone: 'UTC' });

export function calendarDate(date: Date | string) {
	return dateFormatter.format(new Date(date));
}