// Copyright: © 2026 TWWIM UG. All rights reserved. (www.twwim.com)
/**
 * TanStack Query hook for the operator's own availability state.
 *
 * - useOperatorAvailability(): query for the current persisted flag, fetched
 *   once on mount (no polling — the user is the only writer).
 * - useSetOperatorAvailability(): mutation that PATCHes the new value and
 *   refreshes the query plus the members list (other dashboards in the same
 *   tenant see the change next time they re-render).
 *
 * Limitation: ADMIN/MANAGER/WORKER hit a 403 from the API and the query
 * surfaces as `error`. The toggle component renders a neutral pill in that
 * case — useful for tenants where the chat operator role isn't yet assigned.
 */

import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { operatorAvailabilityApi } from '@/infrastructure/http/api/operator-availability/api';
import type {
  OperatorAvailabilityRequest,
  OperatorAvailabilityResponse,
} from '@archer/api-interface';

const KEY = ['operator', 'availability'] as const;

export function useOperatorAvailability() {
  return useQuery<OperatorAvailabilityResponse>({
    queryKey: KEY,
    queryFn: () => operatorAvailabilityApi.get(),
    // No automatic refetch — the operator is the only writer of this flag.
    // Tab focus refetch still applies (a colleague who toggled in another
    // browser tab will be picked up when this tab regains focus).
    refetchOnWindowFocus: true,
    staleTime: 30_000,
    retry: (failureCount, err: any) => {
      // 403 = caller is not an OPERATOR — don't pound the endpoint.
      const status = err?.status ?? err?.response?.status;
      if (status === 403 || status === 401) return false;
      return failureCount < 2;
    },
  });
}

export function useSetOperatorAvailability() {
  const qc = useQueryClient();
  return useMutation<OperatorAvailabilityResponse, Error, OperatorAvailabilityRequest>({
    mutationFn: (payload) => operatorAvailabilityApi.set(payload),
    onSuccess: (snapshot) => {
      qc.setQueryData(KEY, snapshot);
      // Teammates list shows availability dots — invalidate so a fresh fetch
      // brings the new state in. Keys live under ['company', 'members', …]
      // and we want any variant to refresh.
      qc.invalidateQueries({ queryKey: ['company', 'members'] });
    },
  });
}