// SRC-06: statische Facettendimensionen-Whitelist, gespiegelt aus
// mail/internal/search/fields.go (FacetFields, SRC-05) — nur diese
// Feldnamen sind als Filterdimension zulässig, kein beliebiger
// Client-Feldname.
export const FACET_FIELDS = ["sender", "mailbox", "attachment_type", "tag"] as const;
export type FacetField = (typeof FACET_FIELDS)[number];

export function isFacetField(value: string): value is FacetField {
  return (FACET_FIELDS as readonly string[]).includes(value);
}

export const FACET_FIELD_LABELS: Record<FacetField, string> = {
  sender: "Absender",
  mailbox: "Postfach",
  attachment_type: "Anhangstyp",
  tag: "Tag",
};