loadBaseline method

Future<StressReport?> loadBaseline(String modelId)

Loads the most recent baseline for a given model.

Implementation

Future<StressReport?> loadBaseline(String modelId) async {
  await _ensureDirectory();
  final dir = Directory(baselineDirectory);
  final files = await dir
      .list()
      .where((entity) =>
          entity is File &&
          entity.path.contains('baseline_${modelId}_') &&
          entity.path.endsWith('.json'))
      .toList();

  if (files.isEmpty) {
    return null;
  }

  // ⚡ Bolt: Cache file modification times to avoid O(N log N) synchronous disk I/O
  // statSync() in a sort comparator causes repeated disk access.
  // Instead, we stat asynchronously once per file and sort the cached results.
  final filesWithStats = await Future.wait(files.map((file) async {
    final stat = await file.stat();
    return MapEntry(file as File, stat.modified);
  }));

  // Get the most recent file
  filesWithStats.sort((a, b) => a.value.compareTo(b.value));

  final latestFile = filesWithStats.last.key;
  final content = await latestFile.readAsString();
  final json = jsonDecode(content) as Map<String, dynamic>;
  return StressReport.fromJson(json);
}