downloadFileHelper function

Future<DownloadResult?> downloadFileHelper(String url)

Implementation

Future<DownloadResult?> downloadFileHelper(String url) async {
  try {
    final dir = await getApplicationDocumentsDirectory();
    final fileName = Uri.parse(url).pathSegments.last;
    final filePath = '${dir.path}/$fileName';

    // ✅ Check if the cached file exists and is still valid
    if (await _isCacheValid(filePath)) {
      debugPrint('Using cached file: $filePath');
      return (file: XFile(filePath), progress: Stream.value(100.0));
    }

    // 🔽 Create a StreamController to emit progress updates
    final StreamController<double> progressController = StreamController<double>();

    debugPrint('Downloading new file...');
    await Dio().download(
      url,
      filePath,
      onReceiveProgress: (count, total) {
        double progress = (count / total) * 100;
        progressController.add(progress);
      },
    );

    // ✅ Save the timestamp of this download
    await _saveCacheTimestamp(filePath);

    // Close the stream after download completion
    progressController.close();

    return (file: File(filePath).existsSync() ? XFile(filePath) : null, progress: progressController.stream);
  } catch (e) {
    debugPrint('Error downloading file: $e');
    return null;
  }
}