import React, { type JSX } from 'react';
import Link from 'next/link';
import type { IUserHasId } from '@growi/core';
import { type IUser, isPopulated, type Ref } from '@growi/core';
import { pagePathUtils } from '@growi/core/dist/utils';
import { UserPicture } from '@growi/ui/dist/components';
import { format } from 'date-fns/format';
import { useTranslation } from 'next-i18next';

import styles from './AuthorInfo.module.scss';

const UserLabel = ({
  user,
}: {
  user: IUserHasId | Ref<IUser>;
}): JSX.Element => {
  if (isPopulated(user)) {
    return (
      <Link href={pagePathUtils.userHomepagePath(user)} prefetch={false}>
        {user.name}
      </Link>
    );
  }

  return <i>(anyone)</i>;
};

type AuthorInfoProps = {
  date: Date;
  user?: IUserHasId | Ref<IUser>;
  mode: 'create' | 'update';
  locate: 'pageSide' | 'footer';
};

export const AuthorInfo = (props: AuthorInfoProps): JSX.Element => {
  const { t } = useTranslation();
  const { date, user, mode = 'create', locate = 'pageSide' } = props;

  const formatType = 'yyyy/MM/dd HH:mm';

  const infoLabelForPageSide =
    mode === 'create'
      ? t('author_info.created_by')
      : t('author_info.updated_by');
  const nullinfoLabelForFooter =
    mode === 'create' ? 'Created by' : 'Updated by';
  const infoLabelForFooter =
    mode === 'create'
      ? t('author_info.created_at')
      : t('author_info.last_revision_posted_at');
  const userLabel = user != null ? <UserLabel user={user} /> : <i>Unknown</i>;

  if (locate === 'footer') {
    try {
      return (
        <p>
          {infoLabelForFooter} {format(new Date(date), formatType)} by{' '}
          <UserPicture user={user} size="sm" /> {userLabel}
        </p>
      );
    } catch (err) {
      if (err instanceof RangeError) {
        return (
          <p>
            {nullinfoLabelForFooter} <UserPicture user={user} size="sm" />{' '}
            {userLabel}
          </p>
        );
      }
      return <></>;
    }
  }

  const renderParsedDate = () => {
    try {
      return format(new Date(date), formatType);
    } catch (err) {
      return '';
    }
  };

  return (
    <div
      className={`grw-author-info ${styles['grw-author-info']} d-flex align-items-center mb-2`}
    >
      <div className="me-2 d-none d-lg-block">
        <UserPicture user={user} size="sm" />
      </div>
      <div>
        <div className="text-secondary mb-1">
          {infoLabelForPageSide} <br className="d-lg-none" />
          {userLabel}
        </div>
        <div className="text-secondary text-date" data-vrt-blackout-datetime>
          {renderParsedDate()}
        </div>
      </div>
    </div>
  );
};