import 'dart:async';
import 'package:uvok_epaper_badge/control/scanner_controller.dart';
import 'package:meta/meta.dart';
import 'package:uvok_epaper_badge/model/device/device.dart';

import 'package:rxdart/rxdart.dart';

/// Helper class which provides the setStatus method.
abstract class ScannerControllerImpl extends ScannerController {
  final BehaviorSubject<ScanStatus> _scanStatusController =
      BehaviorSubject<ScanStatus>();
  final BehaviorSubject<List<Device>> _deviceContoller =
      BehaviorSubject<List<Device>>();
  final BehaviorSubject<ScanAvailability> _availabilityController =
      BehaviorSubject<ScanAvailability>();

  @override
  Stream<ScanStatus> get statusStream => _scanStatusController.stream;

  @override
  Stream<List<Device>> get scanResultsStream => _deviceContoller.stream;

  @override
  Stream<ScanAvailability> get availabilityStream =>
      _availabilityController.stream;

  @protected
  void setStatus(ScanStatus newStatus) {
    if (_scanStatusController.isClosed) return;

    _scanStatusController.add(newStatus);
  }

  @protected
  void setDevices(List<Device> devices) {
    if (_deviceContoller.isClosed) return;

    _deviceContoller.add(devices);
  }

  @protected
  void setAvailability(ScanAvailability available) {
    _availabilityController.add(available);
  }

  @override
  void dispose() {
    _scanStatusController.close();
    _deviceContoller.close();
    _availabilityController.close();
  }
}