import dayjs from 'dayjs';
import relativeTime from 'dayjs/esm/plugin/relativeTime';
import localizedFormat from 'dayjs/plugin/localizedFormat';
import updateLocale from 'dayjs/plugin/updateLocale';
import isToday from 'dayjs/plugin/isToday';
import utc from 'dayjs/plugin/utc';
import timezone from 'dayjs/plugin/timezone';

dayjs.extend(updateLocale);
dayjs.extend(relativeTime);
dayjs.extend(localizedFormat);
dayjs.extend(isToday);
dayjs.extend(utc);
dayjs.extend(timezone);

dayjs.shortFormating = (s, ago = false) => {
	if (s === 'now' || s === 'now ago') {
		return 'now';
	}

	const prefix = s.split(' ')[0];
	const posfix = s.split(' ')[1];
	const isPast = s.includes('ago');
	let newPostfix = '';
	switch (posfix) {
		case 'minute':
			newPostfix = 'm';
			break;
		case 'minutes':
			newPostfix = 'm';
			break;
		case 'hour':
			newPostfix = 'h';
			break;
		case 'hours':
			newPostfix = 'h';
			break;
		case 'day':
			newPostfix = 'd';
			break;
		case 'days':
			newPostfix = 'd';
			break;
		case 'month':
			newPostfix = 'M';
			break;
		case 'months':
			newPostfix = 'M';
			break;
		case 'year':
			newPostfix = 'Y';
			break;
		case 'years':
			newPostfix = 'Y';
			break;
	}
	return `${['a', 'an'].includes(prefix) ? '1' : prefix} ${newPostfix}${
		isPast ? (ago ? ' ago' : '') : ''
	}`;
};

export function dayjsLocal(dateTimeString) {
	let localTimezone = dayjs.tz.guess();
	// dates are stored in Asia/Calcutta timezone on the server
	return dayjs.tz(dateTimeString, 'Asia/Calcutta').tz(localTimezone);
}

export function dayjsIST(dateTimeString) {
	return dayjs(dateTimeString).tz('Asia/Calcutta');
}

export default dayjs;