/**
 * One source of truth for "is this PL24 node a parts leaf or a group to drill?".
 *
 * WHY THIS FILE EXISTS (plv2.md, findings p5core-02 / psa-05 / consumers_jobs-01):
 * the same question was answered by four independent heuristics —
 * `categories.service` (twice), `catalog.service` and the prefetch worker — and
 * they disagreed. Two failure modes shipped repeatedly:
 *
 *  1. `linkWid.includes("group")` as the "is a group" test. Live P5 PSA's second
 *     level has wid `illusTable`, Volvo's and Subaru's `illustrationsTable` —
 *     none contain "group", so those nodes fell through to the parts fetcher,
 *     which asked an *illustration list* for parts, got records with no partno,
 *     and rendered a silent empty panel (`parts: []`, no error). This is the same
 *     class of bug as the 2026-06 `isPsaParent` incident.
 *  2. Case-sensitive `includes("/bomdetails")` while p5psa and p5volvo spell the
 *     endpoint `/details/vin/bomDetails` — so those leaves were queued as groups,
 *     `getChildren` returned [] and their parts were never prefetched (live today
 *     for Mitsubishi 99.9% / Fiat 80% / Renault 70% of bomDetails leaves).
 *
 * The reliable cross-brand marker is the response's own `link.wid`: `bomlist`
 * (and the service-parts/partinfo variants) means parts, anything else means
 * drill. Path matching stays as a fallback for stored rows without a wid.
 */

/** `link.wid` values that identify a parts (BOM) node across every P5 backend. */
const LEAF_WIDS = new Set(["bomlist", "bomoverviewlist", "servicepartsitemstable", "partinfo"]);

/** `link.wid` values that identify a drillable group node. */
const GROUP_WID_PATTERN =
  /(group|scope|illus|illustration|catalog|model|vpages|msppages|chemicals|category|categories)/i;

/**
 * Path fragments that only ever appear on a parts endpoint. `image-board` has no
 * leading slash on purpose: the legacy PSA leaf is `vin-image-board.action`.
 */
const LEAF_PATH_PATTERN =
  /\/(bom|bomdetails|partinfo|vin_items|mdl_items|vin_bomdetails)\b|\/bom\/|\/details\/vin\/bomdetails|\/servicepart\/vin_items|image-board/i;

/** True when this node yields parts (never children). */
export function isPl24LeafNode(opts: {
  linkPath?: string | null;
  linkWid?: string | null;
  hasSubgroups?: boolean | null;
}): boolean {
  const wid = opts.linkWid?.toLowerCase().trim();
  if (wid) {
    if (LEAF_WIDS.has(wid)) return true;
    if (GROUP_WID_PATTERN.test(wid)) return false;
  }
  // Explicit DB hint wins over path guessing when there is no usable wid.
  if (opts.hasSubgroups === true) return false;
  const lp = opts.linkPath?.toLowerCase() ?? "";
  if (!lp) return false;
  return LEAF_PATH_PATTERN.test(lp);
}

/** True when this node should be drilled for children. */
export function isPl24GroupNode(opts: {
  linkPath?: string | null;
  linkWid?: string | null;
  hasSubgroups?: boolean | null;
}): boolean {
  if (!opts.linkPath && !opts.linkWid) return false;
  return !isPl24LeafNode(opts);
}