firebase_service_utility.dart

import 'package:google_api_availability/google_api_availability.dart';

enum ServicesAvailability {
  success,
  serviceMissing,
  serviceUpdating,
  serviceVersionUpdateRequired,
  serviceDisabled,
  serviceInvalid,
  notAvailableOnPlatform,
  unknown,
}

abstract class FirebaseServiceUtility {
  Future<ServicesAvailability> checkServiceAvailability();
}

/// How to use:
/// final firebaseServiceUtility = GoogleFirebaseServiceUtility(..)
/// final result = await firebaseServiceUtility.checkServiceAvailability();
/// switch (result) {
///   case ServicesAvailability.success:
///   case ServicesAvailability.serviceUpdating:
///   case ServicesAvailability.serviceVersionUpdateRequired:
///     yield* _processCheckNewVersionUpdate();
///     break;
///   default:
///     // Support cases
///     // - ServicesAvailability.serviceMissing
///     // - ServicesAvailability.serviceInvalid
///     // - ServicesAvailability.notAvailableOnPlatform
/// }
class GoogleFirebaseServiceUtility implements FirebaseServiceUtility {
  final GoogleApiAvailability _googleApiAvailability;

  GoogleFirebaseServiceUtility(this._googleApiAvailability);

  @override
  Future<ServicesAvailability> checkServiceAvailability() async {
    try {
      final result = await _googleApiAvailability
          .checkGooglePlayServicesAvailability(false);
      switch (result) {
        case GooglePlayServicesAvailability.success:
          return ServicesAvailability.success;
        case GooglePlayServicesAvailability.serviceMissing:
          return ServicesAvailability.serviceMissing;
        case GooglePlayServicesAvailability.serviceUpdating:
          return ServicesAvailability.serviceUpdating;
        case GooglePlayServicesAvailability.serviceVersionUpdateRequired:
          return ServicesAvailability.serviceVersionUpdateRequired;
        case GooglePlayServicesAvailability.serviceDisabled:
          return ServicesAvailability.serviceDisabled;
        case GooglePlayServicesAvailability.serviceInvalid:
          return ServicesAvailability.serviceInvalid;
        case GooglePlayServicesAvailability.notAvailableOnPlatform:
          // TODO Note that on iOS this will always return notAvailableOnPlatform!
          return ServicesAvailability.notAvailableOnPlatform;
        default:
          return ServicesAvailability.unknown;
      }
    } catch (e) {
      return ServicesAvailability.unknown;
    }
  }
}