#!/usr/bin/env node
// tools/scripts/lint-atlas-hash.mjs
// [impl->REQ-MAP-02]
// TODO Phase 8: swap tag to [impl->REQ-MAP-01]; activate real hash compare against apps/client/public/atlas-mvp.png.
//
// Phase 7 stub. When Phase 8 lands TestBed_001.ldtk and the real atlas,
// this script will assert no .ldtk under maps/ declares a tilesetSourceHash
// mismatching sha256(referenced PNG). For now it no-ops when maps/ is empty
// or only contains _smoke/ artifacts (Plan 07-07 smoke files).
//
// Usage: node tools/scripts/lint-atlas-hash.mjs
// Exit:  0 (stub never fails in Phase 7); Phase 8 swap may add exit 1 on mismatch.

import { readdirSync, existsSync, readFileSync, statSync } from 'node:fs';
import { createHash } from 'node:crypto';
import { join } from 'node:path';

const MAPS_DIR = 'maps';

if (!existsSync(MAPS_DIR)) {
  console.log('lint-atlas-hash: OK (maps/ does not exist yet — Phase 7 baseline)');
  process.exit(0);
}

function findLdtk(dir, out = []) {
  for (const f of readdirSync(dir)) {
    const p = join(dir, f);
    const s = statSync(p);
    if (s.isDirectory()) findLdtk(p, out);
    else if (p.endsWith('.ldtk')) out.push(p);
  }
  return out;
}

const ldtkFiles = findLdtk(MAPS_DIR).filter((p) => !p.includes('_smoke'));

if (ldtkFiles.length === 0) {
  console.log('lint-atlas-hash: OK (no production .ldtk files yet — Phase 8 will activate)');
  process.exit(0);
}

// PITFALL 4 (07-PATTERNS.md): noisy log on every preflight run when production
// .ldtk files exist but the real check is not yet wired — annoying-enough-to-notice.
console.log(`lint-atlas-hash: Phase 8 logic not yet wired — ${ldtkFiles.length} file(s) found, deferred`);
process.exit(0);