import { format, parseISO } from 'date-fns';
import { fr } from 'date-fns/locale';

/**
 * Extract the week number from an ISO week string like "2026-W12".
 * Returns the numeric string (e.g. "12") or the raw input if parsing fails.
 */
export function extractWeekNumber(week: string): string {
  const match = week.match(/-W(\d{1,2})$/);
  return match ? match[1] : week;
}

/**
 * Format an ISO date string (e.g. "2026-03-21T10:00:00Z") as "21 mars 2026".
 */
export function formatDate(isoDate: string): string {
  try {
    return format(parseISO(isoDate), 'dd MMM yyyy', { locale: fr });
  } catch {
    return isoDate;
  }
}

/**
 * Format an ISO date string as "21 mars 2026" (full month name).
 */
export function formatDateLong(isoDate: string): string {
  try {
    return format(parseISO(isoDate), 'dd MMMM yyyy', { locale: fr });
  } catch {
    return isoDate;
  }
}