format-date.tsx

import type { Locale } from 'date-fns';
import { format, formatRelative, isSameDay, isToday, isYesterday, subDays } from 'date-fns';
import { fr } from 'date-fns/locale';
import { isNaN } from 'lodash';

const formatRelativeLocale = {
  lastWeek: 'eeee \'dernier,\' HH:mm',
  yesterday: '\'Hier,\' HH:mm',
  today: '\'Aujourd\'hui,\' HH:mm',
  tomorrow: '\'Demain,\' HH:mm',
  nextWeek: 'eeee\',\' HH:mm',
  other: '',

};

const locale = {
  ...fr,
  formatRelative: token => formatRelativeLocale[token],
} satisfies Pick<Locale, keyof Locale>;

export function formatDate(dateString: string | undefined): string {
  if (!dateString) {
    return '-';
  }

  const date = new Date(dateString);
  if (isNaN(date.getTime())) {
    return '-';
  }

  const now = new Date();

  if (isSameDay(date, subDays(now, 2))) {
    return `Avant-hier, ${format(date, 'HH:mm')}`;
  }

  if (!isToday(date) && !isYesterday(date) && date < now) {
    if (date.getFullYear() === now.getFullYear()) {
      return format(date, 'd MMMM\',\' HH:mm', { locale: fr });
    }
    return format(date, 'd MMMM yyyy\',\' HH:mm', { locale: fr });
  }

  return formatRelative(date, now, { locale });
}