import '../lib/utils/protocol_helper.dart';

// Simulated environment for verification
class MockDatabase {
  final List<Map<String, dynamic>> savedFragments = [];
  Future<void> saveFragment(String phone, String msgId, int index, int total, String body) async {
    savedFragments.add({
      'phone': phone,
      'msgId': msgId,
      'index': index,
      'total': total,
      'body': body,
    });
    print('   [MockDB] Saved fragment $index/$total for $msgId');
  }
}

void main() async {
  print('Verifying Background Message Handling Logic...');

  final mockDb = MockDatabase();
  final phone = '09123456789';
  
  // Test Case 1: Standard Symmetric Message
  print('\nCase 1: Standard Symmetric Message');
  final body1 = '@S:SYM|h1:payload';
  final parsed1 = ProtocolHelper.parseMessage(body1);
  assert(parsed1['type'] == 'sym');
  assert(parsed1['payload'] == 'h1:payload');
  print('✅ Logic: Show "Secure Message Received" notification');

  // Test Case 2: Fragment Message
  print('\nCase 2: Fragment Message');
  final body2 = '@S:SFRA|msg123|1|3|chunk1';
  final parsed2 = ProtocolHelper.parseMessage(body2);
  assert(parsed2['type'] == 'sfra');
  
  // Real logic would be: if (type == 'sfra') { await db.saveFragment(...) }
  if (parsed2['type'] == 'sfra') {
    await mockDb.saveFragment(
        phone, parsed2['packetId'], parsed2['partNo'], parsed2['totalParts'], parsed2['chunk']);
  }
  
  assert(mockDb.savedFragments.length == 1);
  assert(mockDb.savedFragments[0]['msgId'] == 'msg123');
  assert(mockDb.savedFragments[0]['index'] == 1);
  print('✅ Logic: Save fragment to DB and show "Receiving part 1/3" notification');

  print('\nAll background logic checks passed! 🚀');
}