/**
 * Single source of truth for rendering a `Rejection` (§3.5 — a backend
 * `message_key` + opaque `data` bag, same idiom as `Tip`/`PlanWarning`) in
 * the caller's active locale.
 *
 * Every rejection `message_key` `POST /api/plan/apply` and
 * `POST /api/plan/sync` (`app/services/planning_service.py`) can return,
 * including `insufficientVacationBalance`
 * (`data: {parent_personal_data_uuid, year, needed, remaining}`).
 *
 * Previously duplicated between `PlanFold.tsx` and
 * `frontend/src/components/planning/PlanResults.tsx` (the latter scheduled
 * for deletion, and missing `insufficientVacationBalance` entirely). Moved
 * here so there is exactly one copy, and so the `/api/plan/sync` toast
 * (`Calendar.tsx`) can render rejections too:
 *
 *   import { renderRejection } from '@/utils/rejectionMessages'
 *   renderRejection(rejection, t, members)
 *
 * where `t` is `useTranslation()`'s translate function and `members` is the
 * workspace's `PersonalData[]` (e.g. from `useWorkspaceMembers`).
 */
import type { PersonalData, Rejection } from '@/types'
import { toTranslationParams, type TranslationKey, type TranslationParams } from '@/i18n'
import { nameResolver } from '@/utils/parentNames'

export type Translate = (key: TranslationKey, params?: TranslationParams) => string

const REJECTION_KEYS: Record<string, TranslationKey> = {
  'planApply.rejection.invalidDayType': 'planResults.rejectionInvalidDayType',
  'planApply.rejection.conflictingDuplicate': 'planResults.rejectionConflictingDuplicate',
  'planApply.rejection.collisionsNeedReplace': 'planResults.rejectionCollisionsNeedReplace',
  'planApply.rejection.dubbeldagWindowExceeded': 'planResults.rejectionDubbeldagWindowExceeded',
  'planApply.rejection.dubbeldagQuotaReached': 'planResults.rejectionDubbeldagQuotaReached',
  'planApply.rejection.dubbeldagInvalid': 'planResults.rejectionDubbeldagInvalid',
  'planApply.rejection.dubbeldagBatchQuotaExceeded': 'planResults.rejectionDubbeldagBatchQuotaExceeded',
  'planApply.rejection.outsideEligibleWindow': 'planResults.rejectionOutsideEligibleWindow',
  'planApply.rejection.insufficientBalance': 'planResults.rejectionInsufficientBalance',
  'planApply.rejection.insufficientVacationBalance': 'planResults.rejectionInsufficientVacationBalance',
}

/** Renders one rejection, never leaking `data.parent_personal_data_uuid` as
 * a raw uuid: whenever that field is present, it's resolved to a display
 * name via `members` (falling back to `planResults.unknownParent` rather
 * than the uuid itself, e.g. while members are still loading or for a
 * removed member) and added to the template params as `parent_name`. An
 * unrecognised `messageKey` falls back to showing the raw key, same idiom
 * as `TipCard.tsx`'s `TIP_TRANSLATION_KEYS`.
 */
export function renderRejection(rejection: Rejection, t: Translate, members: PersonalData[]): string {
  const key = REJECTION_KEYS[rejection.messageKey]
  if (!key) return rejection.messageKey
  const params = toTranslationParams(rejection.data)
  const uuid = rejection.data.parent_personal_data_uuid
  if (typeof uuid === 'string') {
    const resolve = nameResolver(members)
    const name = resolve(uuid)
    params.parent_name = name === uuid ? t('planResults.unknownParent') : name
  }
  return t(key, params)
}