import 'cloud_reconciliation_service.dart';
import '../../database/database.dart';
import '../auth/auth_service.dart';

class CloudRestoreResult {
  final CloudReconciliationResult metadata;
  final int telemetryPending;

  const CloudRestoreResult({
    required this.metadata,
    this.telemetryPending = 0,
  });
}

/// Additive, resumable MotorCloud restore coordinator.
///
/// Metadata is restored first. Telemetry is intentionally not fabricated or
/// marked complete until the authenticated R2 download operation exists.
/// Existing local rides are never deleted or overwritten.
class CloudRestoreService {
  final AuthService _authService;
  final CloudReconciliationService _metadata;

  CloudRestoreService({
    required AppDatabase db,
    required AuthService authService,
    CloudReconciliationService? metadata,
  })  : _authService = authService,
        _metadata = metadata ?? CloudReconciliationService(db: db, authService: authService);

  Future<CloudRestoreResult> restore() async {
    final user = _authService.currentUser;
    if (user == null || user.isAnonymous) {
      throw StateError('Authentication is required to restore MotorCloud data.');
    }

    final metadataResult = await _metadata.reconcileMetadata();
    return CloudRestoreResult(
      metadata: metadataResult,
      // This remains zero until the authenticated R2 download Worker contract
      // is implemented. Metadata restore is still fully useful on its own.
      telemetryPending: 0,
    );
  }
}