import moment from 'moment';
import 'moment/dist/locale/th';
import { i18n } from 'src/boot/i18n';
import { Lang } from './ui';

moment.locale('en');

export function setLocale(locale: string) {
  moment.locale(locale);
}

export function dateFormatJS(opts: {
  date: string | Date | null;
  locale?: string;
  dayStyle?: 'numeric' | '2-digit';
  monthStyle?: 'numeric' | '2-digit' | 'long' | 'short';
  timeStyle?: 'full' | 'long' | 'medium' | 'short';
  timeOnly?: boolean;
  noDay?: boolean;
  noMonth?: boolean;
  noYear?: boolean;
  withTime?: boolean;
}): string {
  const dt = opts.date ? new Date(opts.date) : new Date();

  const { locale } = i18n.global;

  if (!opts.locale) {
    opts.locale = locale.value === Lang.Thai ? 'th-TH' : 'en-US';
  }

  if (opts.timeOnly) {
    opts.noDay = true;
    opts.noMonth = true;
    opts.noYear = true;
    opts.timeStyle = opts.timeStyle || 'short';
  }

  let timeText = opts.withTime
    ? ' ' +
      dateFormatJS({
        date: opts.date,
        timeOnly: true,
        timeStyle: opts.timeStyle,
      })
    : '';

  if (timeText) opts.timeStyle = undefined;

  let formatted = new Intl.DateTimeFormat(opts.locale, {
    day: opts.noDay ? undefined : opts.dayStyle || 'numeric',
    month: opts.noMonth ? undefined : opts.monthStyle || 'short',
    timeStyle: opts.timeStyle,
    year: opts.noYear ? undefined : 'numeric',
  }).format(dt);

  switch (opts.locale) {
    case Lang.Thai:
    case 'th-TH':
    case 'th-Th':
      return (
        formatted.replace(/(\d{4})/, (year) =>
          (parseInt(year) - 543).toString(),
        ) + timeText
      );
    default:
      return formatted + timeText;
  }
}

/**
 * @deprecated use dateFormatJS instead.
 */
export function dateFormat(
  date?: string | Date | null,
  fullmonth = false,
  time = false,
  number = false,
  days = false,
) {
  const m = moment(date);

  if (!m.isValid()) return '';

  if (time) return m.format('HH:mm');
  if (number) return m.format('L');

  const monthFormat = fullmonth ? 'MMMM' : 'MMM';
  const formattedDate = m.format(
    ` ${days ? '' : 'DD'}  ${monthFormat} YYYY ${time ? ' HH:mm' : ''}`,
  );

  return formattedDate;
}

function pad(n: number) {
  return `${Math.floor(Math.abs(n))}`.padStart(2, '0');
}

function getTimezoneOffset(date: Date) {
  const tzOffset = -date.getTimezoneOffset();
  const diff = tzOffset >= 0 ? '+' : '-';
  return diff + pad(tzOffset / 60) + ':' + pad(tzOffset % 60);
}

export function toISOStringWithTimezone(date: Date) {
  return (
    date.getFullYear() +
    '-' +
    pad(date.getMonth() + 1) +
    '-' +
    pad(date.getDate()) +
    'T' +
    pad(date.getHours()) +
    ':' +
    pad(date.getMinutes()) +
    ':' +
    pad(date.getSeconds()) +
    getTimezoneOffset(date)
  );
}

export function calculateAge(dt: Date | null | string): string;
export function calculateAge(
  dt: Date | null | string,
  only: 'year' | 'months' | 'days',
): number;
export function calculateAge(
  dt: Date | null | string,
  only?: 'year' | 'months' | 'days',
) {
  if (!dt) return null;

  const diff = Date.now() - new Date(dt).getTime();
  const offset = new Date(diff);
  const years = offset.getUTCFullYear() - 1970;
  const months = offset.getUTCMonth();
  const days = offset.getUTCDate() - 1;

  switch (only) {
    case 'year':
      return years;
    case 'months':
      return months;
    case 'days':
      return days;
    default:
  }

  switch (i18n.global.locale.value) {
    case Lang.Thai:
      return `${years} ปี ${months !== 0 ? months + ' เดือน' : ''}  ${days !== 0 ? days + ' วัน' : ''}`;
    default:
      return `${years} years ${months !== 0 ? months + ' months' : ''}  ${days !== 0 ? days + ' days' : ''} `;
  }
}

export function disabledAfterToday(date: Date) {
  const today = new Date();
  today.setHours(0, 0, 0, 0);
  return date > today;
}

/**
 * This function accept date format from dd/MMM/YYYY and convert into date object
 */
export function parseAndFormatDate(value: string | number | undefined) {
  if (!value) return;

  if (value && value.toString().length === 10) {
    const [date, month, year] = value.toString().split('/');
    return new Date(`${year}-${month}-${date}T00:00:00.000Z`);
  }
  return null;
}