mileograph_flutter/lib/utils/download_helper.dart

import 'dart:typed_data';

import 'package:file_selector/file_selector.dart';

class SaveResult {
  final String? path;
  final bool canceled;

  const SaveResult({this.path, required this.canceled});
}

Future<SaveResult> saveBytes(
  Uint8List bytes,
  String filename, {
  String? mimeType,
}) async {
  final safeName = filename.trim().isEmpty ? 'export.bin' : filename.trim();
  final location = await getSaveLocation(suggestedName: safeName);
  if (location == null) {
    return const SaveResult(canceled: true);
  }
  final file = XFile.fromData(
    bytes,
    mimeType: mimeType ?? 'application/octet-stream',
    name: safeName,
  );
  await file.saveTo(location.path);
  return SaveResult(path: location.path, canceled: false);
}