/**
 * WordPress dependencies
 */
import { dateI18n, getSettings } from '@safe-wordpress/date';

/**
 * External dependencies
 */
import moment, { Moment } from 'moment';

export {
	date,
	format,
	getDate,
	getSettings,
	isInTheFuture,
} from '@safe-wordpress/date';

export function formatI18nDate( d: string | Date | Moment ): string {
	const settings = getSettings();
	return dateI18n( settings.formats.date, d );
}

export function formatI18nDatetime( d: string | Date ): string {
	const settings = getSettings();
	return dateI18n( settings.formats.datetimeAbbreviated, d );
}

export function getLocale(): string {
	const settings = getSettings();
	return settings.l10n.locale;
}

export function formatDateToUtc( d: string ): string {
	if ( d.endsWith( 'Z' ) ) {
		return d;
	}

	if ( /[+-][0-9]{2}:?[0-9]{2}$/.test( d ) ) {
		return moment( d ).toISOString();
	}

	const settings = getSettings();
	const offset = fixTimezoneOffsetForMoment(
		Number.parseFloat( `${ settings.timezone.offset }` )
	);
	return moment( d + offset ).toISOString();
}

// =======
// HELPERS
// =======

function fixTimezoneOffsetForMoment( offset: number ) {
	const hours = Math.floor( Math.abs( offset ) );
	const decs = Math.abs( offset ) - hours;
	const mins = Math.round( 60 * decs );
	const strHours = `${ hours }`.padStart( 2, '0' );
	const strMins = `${ mins }`.padStart( 2, '0' );
	const sign = 0 <= offset ? '+' : '-';
	return `${ sign }${ strHours }${ strMins }`;
}