import type { EmploymentStatus } from "./supabase/types";

// Langzeitabwesenheit.
//
// The database still stores the employment status as 'Karenz' — renaming an
// enum value would mean rewriting every stored function that spells it, for
// a label change (see supabase/migrations/*_absence_type.sql). So the value
// is mapped to its display name here, in the one place the UI reads it from.

export const ABSENCE_TYPES = [
  "Wochenhilfe (Mutterschutz)",
  "Elternkarenz (inkl. Väterkarenz)",
  "Papamonat",
  "Bildungskarenz",
  "Bildungsteilzeit",
  "Präsenzdienst",
  "Zivildienst",
  "Langer Krankenstand",
  "Wiedereingliederungsteilzeit",
  "Pflegekarenz",
  "Pflegeteilzeit",
  "Familienhospizkarenz",
  "Sabbatical",
] as const;

export type AbsenceType = (typeof ABSENCE_TYPES)[number];

export function isAbsenceType(value: string | null | undefined): value is AbsenceType {
  return ABSENCE_TYPES.includes(value as AbsenceType);
}

/** Display names for the stored status values. */
const STATUS_LABELS: Record<EmploymentStatus, string> = {
  Aktiv: "Aktiv",
  Karenz: "Langzeitabwesenheit",
  Geplant: "Geplant",
  Ausgetreten: "Ausgetreten",
};

export function statusLabel(status: EmploymentStatus): string {
  return STATUS_LABELS[status] ?? status;
}

/**
 * The chip and the detail header show the specific kind when it is known —
 * "Bildungskarenz" says more than "Langzeitabwesenheit". Absences recorded
 * before the type existed have none, and fall back to the generic name
 * rather than to a guess.
 */
export function absenceLabel(status: EmploymentStatus, absenceType: string | null | undefined): string {
  if (status !== "Karenz") return statusLabel(status);
  return isAbsenceType(absenceType) ? absenceType : STATUS_LABELS.Karenz;
}