import 'dart:async';
import 'package:flutter/services.dart';

class ScanResult {
  final String barcode;
  final String codeType;

  ScanResult({required this.barcode, required this.codeType});
}

class ScannerService {
  static const _eventChannel =
      EventChannel('com.example.pad_scanner/scan');

  Stream<ScanResult>? _scanStream;

  Stream<ScanResult> get scanResults {
    _scanStream ??= _eventChannel
        .receiveBroadcastStream()
        .map((event) => event as Map)
        .map((event) => ScanResult(
              barcode: event['barcode'] as String? ?? '',
              codeType: event['codeType'] as String? ?? 'UNKNOWN',
            ));
    return _scanStream!;
  }
}