feat: KitchenStock light UI, Gemma 31B AI, supermarket store filters & 130+ vegan products

src/lib/formatting/date.ts

@@ -0,0 +1,53 @@
+import { format, parseISO, differenceInCalendarDays, isValid } from 'date-fns';
+import { de } from 'date-fns/locale';
+import type { ExpirationWarningStatus } from '@/types/domain';
+
+export function formatDateGerman(dateStr: string | Date | null | undefined): string {
+  if (!dateStr) return '-';
+  const date = typeof dateStr === 'string' ? parseISO(dateStr) : dateStr;
+  if (!isValid(date)) return '-';
+  return format(date, 'dd.MM.yyyy', { locale: de });
+}
+
+export function formatDateTimeGerman(dateStr: string | Date | null | undefined): string {
+  if (!dateStr) return '-';
+  const date = typeof dateStr === 'string' ? parseISO(dateStr) : dateStr;
+  if (!isValid(date)) return '-';
+  return format(date, 'dd.MM.yyyy HH:mm', { locale: de });
+}
+
+export function getExpirationStatus(expirationDateStr: string | null | undefined): ExpirationWarningStatus {
+  if (!expirationDateStr) {
+    return { status: 'OK', label: 'Kein Ablaufdatum', daysRemaining: null };
+  }
+
+  const expDate = parseISO(expirationDateStr);
+  if (!isValid(expDate)) {
+    return { status: 'OK', label: 'Kein Ablaufdatum', daysRemaining: null };
+  }
+
+  const today = new Date();
+  const daysDiff = differenceInCalendarDays(expDate, today);
+
+  if (daysDiff < 0) {
+    return {
+      status: 'EXPIRED',
+      label: `Abgelaufen (${Math.abs(daysDiff)} Tag${Math.abs(daysDiff) === 1 ? '' : 'e'})`,
+      daysRemaining: daysDiff,
+    };
+  }
+  if (daysDiff === 0) {
+    return { status: 'TODAY', label: 'Läuft heute ab', daysRemaining: 0 };
+  }
+  if (daysDiff <= 3) {
+    return { status: 'IN_3_DAYS', label: `Läuft in ${daysDiff} Tagen ab`, daysRemaining: daysDiff };
+  }
+  if (daysDiff <= 7) {
+    return { status: 'IN_7_DAYS', label: `Läuft in ${daysDiff} Tagen ab`, daysRemaining: daysDiff };
+  }
+  if (daysDiff <= 14) {
+    return { status: 'IN_14_DAYS', label: `Läuft in ${daysDiff} Tagen ab`, daysRemaining: daysDiff };
+  }
+
+  return { status: 'OK', label: `Haltbar bis ${formatDateGerman(expDate)}`, daysRemaining: daysDiff };
+}