/**
 * Merge `/users/:id` embedded `partner_groups` with `GET /users/:id/partner-groups` cache.
 * After a partner accepts (or the other side's client refetches), `user.partner_groups` updates
 * first while `partner-groups` may still hold a pre-link `[]` — prefer non-empty user payload.
 */
export function resolvedPartnerGroups(user, groupsQueryData) {
  const fromUser = Array.isArray(user?.partner_groups) ? user.partner_groups : null;
  const fromApi = Array.isArray(groupsQueryData?.items) ? groupsQueryData.items : null;
  if (fromUser?.length) return fromUser;
  if (fromApi?.length) return fromApi;
  return fromUser || fromApi || [];
}

export function preferredPartnerGroupId(groups, currentId = "") {
  const list = Array.isArray(groups) ? groups : [];
  if (!list.length) return "";
  if (currentId && list.some((g) => g?.id === currentId)) return currentId;
  const withPartner = list.find((g) => (g?.member_ids || []).filter(Boolean).length > 0);
  return (withPartner || list[0])?.id || "";
}