/**
 * Post-v5.0.0 additive scanners that the frozen v5.0.0 byte-equal baselines
 * predate: OST (Output-Style Validation, v5.6 C), OPT (Optimization Lens, v5.7),
 * and AGT (Agent-Listing Budget, v5.9 B1). The baselines froze the original
 * scanner set, so this strips these additive scanner entries 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 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', 'AGT']);

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]*\[(OST|OPT|AGT)\][^\n]*\n/gm, '');
}