getPersonalRating method

Implementation

Future<double?> getPersonalRating(Movie movie) async {
  // First check cache.

  if (_cachedRatings != null &&
      _cachedRatings!.containsKey(movie.id.toString())) {
    return _cachedRatings![movie.id.toString()];
  }

  // Try to read file - on first read after app restart, _moviesWithFiles will be empty.
  // But we should still try to read existing files.

  final movieData = await _readMovieFile(movie);
  if (movieData != null && movieData['rating'] != null) {
    final rating = movieData['rating'] as double?;
    if (rating != null) {
      // Cache the result and mark as having a file.

      _cachedRatings ??= {};
      _cachedRatings![movie.id.toString()] = rating;
      _moviesWithFiles.add(movie.id);
      return rating;
    }
  }

  // No rating found - don't cache null values, just return null.

  return null;
}