import { i18next } from '@tencentcloud/uikit-base-component-react';
import {
  format,
  isSameWeek,
  isThisYear,
  isToday,
  isYesterday,
} from 'date-fns';
import { zhCN, ja, ko, zhTW, enUS } from 'date-fns/locale';

function getTimeStamp(time: number, language = 'en-US') {
  const locales: any = {
    'zh-CN': zhCN,
    'zh-TW': zhTW,
    'en-US': enUS,
    'ja-JP': ja,
    'ko-KR': ko,
  };
  const isZh = language.startsWith('zh');
  const locale = locales[language] || locales['en-US'];
  const timeFormat = 'HH:mm';

  if (!time) {
    return '';
  }

  if (isToday(time)) {
    return format(time, timeFormat, { locale });
  }

  if (isYesterday(time)) {
    const yesterdayText = i18next.t('TUIChat.Yesterday', { defaultValue: 'Yesterday' });
    return `${yesterdayText} ${format(time, timeFormat, { locale })}`;
  }

  if (isSameWeek(time, new Date(), { weekStartsOn: 1 })) {
    return `${format(time, 'EEEE', { locale })} ${format(time, timeFormat, { locale })}`;
  }

  if (isThisYear(time)) {
    if (isZh) {
      return format(time, 'M月d日 HH:mm', { locale });
    }
    return format(time, 'MMMM d HH:mm', { locale });
  }

  if (isZh) {
    return format(time, 'yyyy年M月d日 HH:mm', { locale });
  }
  return format(time, 'yyyy/MM/dd HH:mm', { locale });
}

const birthdayToAge = (birthday: number) => {
  const today = new Date();
  const birthDate = new Date(
    Math.floor(birthday / 10000),
    Math.floor((birthday % 10000) / 100) - 1,
    birthday % 100,
  );
  let age = today.getFullYear() - birthDate.getFullYear();
  const monthDiff = today.getMonth() - birthDate.getMonth();
  if (monthDiff < 0 || (monthDiff === 0 && today.getDate() < birthDate.getDate())) {
    age -= 1;
  }
  return age;
};

const ageToBirthday = (age: number | undefined) => {
  if (!age) {
    return undefined;
  }
  const today = new Date();
  const year = today.getFullYear() - age;
  return year * 10000 + (today.getMonth() + 1) * 100 + today.getDate();
};

export {
  getTimeStamp,
  birthdayToAge,
  ageToBirthday,
};