// Events
abstract class BranchEvent extends Equatable {}

class LoadBranch extends BranchEvent {}
class CreateBranch extends BranchEvent {}
class UpdateBranch extends BranchEvent {}
class DeleteBranch extends BranchEvent {}

// States
abstract class BranchState extends Equatable {}

class BranchInitial extends BranchState {}
class BranchLoading extends BranchState {}
class BranchLoaded extends BranchState {}
class BranchError extends BranchState {}

// BLoC
class BranchBloc extends Bloc<BranchEvent, BranchState> {
  final BranchRepository _repository;
  
  BranchBloc({required BranchRepository repository})
      : _repository = repository,
        super(BranchInitial()) {
    on<LoadBranch>(_onLoad);
    on<CreateBranch>(_onCreate);
    on<UpdateBranch>(_onUpdate);
    on<DeleteBranch>(_onDelete);
  }
  
  Future<void> _onLoad(
    LoadBranch event,
    Emitter<BranchState> emit,
  ) async {
    emit(BranchLoading());
    
    final result = await _repository.getBranchs();
    
    result.fold(
      (failure) => emit(BranchError(failure.message)),
      (data) => emit(BranchLoaded(data)),
    );
  }
}

abstract class BranchRepository {
  Future<Either<Failure, List<Branch>>> getBranchs();
  Future<Either<Failure, Branch>> getBranchById(String id);
  Future<Either<Failure, Branch>> createBranch(Branch data);
  Future<Either<Failure, Branch>> updateBranch(String id, Branch data);
  Future<Either<Failure, void>> deleteBranch(String id);
}

class BranchRepositoryImpl implements BranchRepository {
  final BranchApi _api;
  final BranchLocalRepository _localRepo;
  
  @override
  Future<Either<Failure, List<Branch>>> getBranchs() async {
    try {
      // Try local first (offline-first)
      final local = await _localRepo.getBranchs();
      
      // Sync with API in background
      final result = await _api.getBranchs();
      result.fold(
        (failure) => null,
        (data) => _localRepo.saveBranchs(data),
      );
      
      return Right(local.isNotEmpty ? local : result.getOrElse(() => []));
    } catch (e) {
      return Left(UnexpectedFailure(e.toString()));
    }
  }
}

GET /api/v1/branches/*
Authorization: Bearer {access_token}

{
  "success": true,
  "data": [
    {
      "id": "123",
      "name": "Example",
      "created_at": "2024-10-14T10:00:00Z"
    }
  ],
  "pagination": {
    "page": 1,
    "limit": 20,
    "total": 100
  }
}

@collection
class BranchLocal {
  Id id = Isar.autoIncrement;
  
  @Index()
  String? branchId;
  
  String? name;
  DateTime? createdAt;
  DateTime? updatedAt;
  DateTime? syncedAt;
  
  bool? isSynced;
  bool? isDeleted;
}

// Get all
final items = await isar.branchLocals.where().findAll();

// Get by ID
final item = await isar.branchLocals
    .filter()
    .branchIdEqualTo(id)
    .findFirst();

// Search
final results = await isar.branchLocals
    .filter()
    .nameContains(query, caseSensitive: false)
    .findAll();

// Get unsynced
final unsynced = await isar.branchLocals
    .filter()
    .isSyncedEqualTo(false)
    .findAll();

class BranchPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (context) => getIt<BranchBloc>()..add(LoadBranch()),
      child: Scaffold(
        appBar: AppBar(title: Text('Branch Management')),
        body: BlocBuilder<BranchBloc, BranchState>(
          builder: (context, state) {
            if (state is BranchLoading) {
              return Center(child: CircularProgressIndicator());
            }
            
            if (state is BranchError) {
              return ErrorWidget(message: state.message);
            }
            
            if (state is BranchLoaded) {
              return BranchListView(items: state.items);
            }
            
            return SizedBox.shrink();
          },
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () => _navigateToCreate(context),
          child: Icon(Icons.add),
        ),
      ),
    );
  }
}

void main() {
  group('BranchBloc', () {
    late BranchBloc bloc;
    late MockBranchRepository mockRepository;

    setUp(() {
      mockRepository = MockBranchRepository();
      bloc = BranchBloc(repository: mockRepository);
    });

    tearDown(() {
      bloc.close();
    });

    test('initial state is BranchInitial', () {
      expect(bloc.state, equals(BranchInitial()));
    });

    blocTest<BranchBloc, BranchState>(
      'emits [Loading, Loaded] when Load succeeds',
      build: () {
        when(() => mockRepository.getBranchs()).thenAnswer(
          (_) async => Right([Branch(id: '1', name: 'Test')]),
        );
        return bloc;
      },
      act: (bloc) => bloc.add(LoadBranch()),
      expect: () => [
        BranchLoading(),
        isA<BranchLoaded>(),
      ],
    );
  });
}