import { useMutation } from '@tanstack/react-query';
import { payoutsApi } from '../apis';
import type { PayoutBatchPreview } from '../types';

/**
 * The eligibility dry-run for a window — a **mutation**, not an auto-fetching query: it runs only when the
 * admin explicitly asks to preview (never on mount), and its result (the eligible/skipped breakdown + the
 * server's holiday-shifted processing date) is read from the mutation's `data`. The client renders it; it
 * never computes eligibility or the shifted date.
 */
export function usePreviewPayoutBatch() {
  return useMutation<PayoutBatchPreview, unknown, { periodStart: string; periodEnd: string }>({
    mutationFn: ({ periodStart, periodEnd }) => payoutsApi.previewPayoutBatch(periodStart, periodEnd),
  });
}