import dayjs, { extend } from 'dayjs';
import localizedFormat from 'dayjs/plugin/localizedFormat';

/** @see https://day.js.org/docs/en/display/format#localized-formats */
extend(localizedFormat);

export interface TimeStringsObject {
  years: number;
  months: number;
  days: number;
  hours: number;
  minutes: number;
  seconds: number;
  firstDateWasLater: boolean;
  displaySeconds?: boolean;
}

const useTimeHelper = (t: any) => {
  const buildStringFromValues = (payload: TimeStringsObject) => {
    const {
      years,
      months,
      days,
      hours,
      minutes,
      seconds,
      firstDateWasLater,
      displaySeconds,
    } = payload;
    const result = [];

    if (years) { result.push(t('year', years)); }
    if (months) { result.push(t('month', months)); }
    if (days) { result.push(t('day', days)); }
    if (hours) { result.push(t('hour', hours)); }
    if (minutes) { result.push(t('minute', minutes)); }
    if (seconds && ((!years && !months && !days && !hours && !minutes) || displaySeconds)) { result.push(t('second', seconds)); }
    if (firstDateWasLater) { result.push(t('ago')); }
    return result.join(' ');
  };

  const formatDate = (date: number): string => dayjs(date).format('llll');

  /**
 * Original meat and potatos from:
 * @version: 1.0.1
 * @author: huangjinlin
 * @repo: https://github.com/huangjinlin/dayjs-precise-range
 */
  const buildValueObject = (
    yDiff: number,
    mDiff: number,
    dDiff: number,
    hourDiff: number,
    minDiff: number,
    secDiff: number,
    firstDateWasLater: boolean
  ): TimeStringsObject => ({
    years: yDiff,
    months: mDiff,
    days: dDiff,
    hours: hourDiff,
    minutes: minDiff,
    seconds: secDiff,
    firstDateWasLater,
  });

  const preciseDateDiff = (d1: dayjs.Dayjs, d2: dayjs.Dayjs): TimeStringsObject => {
    let m1 = dayjs(d1);
    let m2 = dayjs(d2);
    let firstDateWasLater;

    if (m1.isSame(m2)) {
      return buildValueObject(0, 0, 0, 0, 0, 0, false);
    }
    if (m1.isAfter(m2)) {
      const tmp = m1;
      m1 = m2;
      m2 = tmp;
      firstDateWasLater = true;
    } else {
      firstDateWasLater = false;
    }

    let yDiff = m2.year() - m1.year();
    let mDiff = m2.month() - m1.month();
    let dDiff = m2.date() - m1.date();
    let hourDiff = m2.hour() - m1.hour();
    let minDiff = m2.minute() - m1.minute();
    let secDiff = m2.second() - m1.second();

    if (secDiff < 0) {
      secDiff = 60 + secDiff;
      minDiff -= 1;
    }
    if (minDiff < 0) {
      minDiff = 60 + minDiff;
      hourDiff -= 1;
    }
    if (hourDiff < 0) {
      hourDiff = 24 + hourDiff;
      dDiff -= 1;
    }
    if (dDiff < 0) {
      const daysInLastFullMonth = dayjs(`${m2.year()}-${m2.month() + 1}`).subtract(1, 'M').daysInMonth();
      if (daysInLastFullMonth < m1.date()) { // 31/01 -> 2/03
        dDiff = daysInLastFullMonth + dDiff + (m1.date() - daysInLastFullMonth);
      } else {
        dDiff = daysInLastFullMonth + dDiff;
      }
      mDiff -= 1;
    }
    if (mDiff < 0) {
      mDiff = 12 + mDiff;
      yDiff -= 1;
    }

    return buildValueObject(yDiff, mDiff, dDiff, hourDiff, minDiff, secDiff, firstDateWasLater);
  };

  const readableDifference = (a = '', b = '') => {
    try {
      const x = a ? dayjs(parseInt(a, 10)) : dayjs();
      const y = b ? dayjs(parseInt(b, 10)) : dayjs();
      return preciseDateDiff(x, y);
    } catch (error) {
      throw new Error('Couldn\'t calculate date difference');
    }
  };

  const dateDiff = (time: string, countUp: boolean) => countUp ? readableDifference(time, '') : readableDifference('', time);

  return {
    buildStringFromValues,
    dateDiff,
    formatDate,
  };
};

export default useTimeHelper;