/**
 * v5.6 C added the OST (Output-Style Validation) scanner — a 14th orchestrated
 * scanner. The frozen v5.0.0 byte-equal baselines predate it (13 scanners), so
 * this strips the additive OST scanner entry before comparison, the same way
 * strip-hotspot-load-pattern.mjs handles B2's additive hotspot fields. Stripping
 * (rather than re-seeding the frozen snapshots) keeps the strongest invariant:
 * the ORIGINAL 13 scanners still emit byte-identical output, and the frozen
 * snapshots stay free of post-v5.0.0 drift (the hotspot triple, ancestor token
 * counts) that re-seeding would bake in.
 *
 * Removing a zero-finding scanner entry only moves `aggregate.scanners_ok`
 * (OST is always status 'ok' and emits nothing on the deterministic fixture, so
 * total_findings / counts / risk_score / verdict are unchanged). The strip
 * decrements scanners_ok to match.
 *
 * Mutates in place and returns the payload for chaining inside a normalizer:
 *   return stripAddedScanners(stripHotspotLoadPattern(out));
 */

const ADDED_SCANNERS = new Set(['OST', 'OPT']);

function stripFromEnvelope(env) {
  if (!env || typeof env !== 'object' || !Array.isArray(env.scanners)) return;
  let removedOk = 0;
  const kept = [];
  for (const s of env.scanners) {
    if (ADDED_SCANNERS.has(s.scanner)) {
      if (s.status === 'ok') removedOk++;
      continue;
    }
    kept.push(s);
  }
  env.scanners = kept;
  if (env.aggregate && typeof env.aggregate.scanners_ok === 'number') {
    env.aggregate.scanners_ok -= removedOk;
  }
}

/**
 * Strip added (post-v5.0.0) scanner entries from a CLI payload / envelope —
 * both top-level (`scanners`) and nested (`scannerEnvelope.scanners`).
 * @template T
 * @param {T} payload
 * @returns {T}
 */
export function stripAddedScanners(payload) {
  if (!payload || typeof payload !== 'object') return payload;
  stripFromEnvelope(payload);
  if (payload.scannerEnvelope) stripFromEnvelope(payload.scannerEnvelope);
  return payload;
}

/**
 * Remove `[OST] …` per-scanner progress lines from a captured stderr scorecard,
 * so a 14-scanner live run matches the frozen 13-scanner stderr snapshot.
 * @param {string} text
 * @returns {string}
 */
export function stripAddedScannerStderr(text) {
  if (typeof text !== 'string') return text;
  return text.replace(/^[ \t]*\[(OST|OPT)\][^\n]*\n/gm, '');
}