import 'package:bloc_test/bloc_test.dart';
import 'package:dio/dio.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:mockito/annotations.dart';
import 'package:mockito/mockito.dart';
import 'package:unionflow_mobile_apps/core/config/environment.dart';
import 'package:unionflow_mobile_apps/features/notifications/data/models/notification_model.dart';
import 'package:unionflow_mobile_apps/features/notifications/data/repositories/notification_repository.dart';
import 'package:unionflow_mobile_apps/features/notifications/presentation/bloc/notifications_bloc.dart';

@GenerateMocks([NotificationRepository])
import 'notifications_bloc_test.mocks.dart';

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

NotificationModel _makeNotification({
  String id = 'notif-1',
  String type = 'SYSTEME',
  bool read = false,
  String? statut,
}) =>
    NotificationModel(
      id: id,
      typeNotification: type,
      sujet: 'Sujet $id',
      corps: 'Corps de la notification',
      statut: statut ?? (read ? 'LUE' : 'NON_LUE'),
      dateLecture: read ? DateTime(2026, 1, 1) : null,
    );

DioException _makeDioException({int? statusCode, DioExceptionType? type}) =>
    DioException(
      requestOptions: RequestOptions(path: '/notifications'),
      response: statusCode != null
          ? Response(
              requestOptions: RequestOptions(path: '/notifications'),
              statusCode: statusCode,
            )
          : null,
      type: type ?? DioExceptionType.connectionError,
    );

// ---------------------------------------------------------------------------

void main() {
  late MockNotificationRepository mockRepository;

  setUpAll(() {
    try {
      AppConfig.initialize();
    } catch (_) {
      // Already initialized.
    }
  });

  NotificationsBloc buildBloc() => NotificationsBloc(mockRepository);

  setUp(() {
    mockRepository = MockNotificationRepository();
  });

  // ─── Initial state ────────────────────────────────────────────────────────

  group('initial state', () {
    test('is NotificationsInitial', () {
      expect(buildBloc().state, const NotificationsInitial());
    });
  });

  // ─── LoadNotifications ────────────────────────────────────────────────────

  group('LoadNotifications', () {
    final notifs = [
      _makeNotification(),
      _makeNotification(id: 'notif-2', read: true),
    ];

    blocTest<NotificationsBloc, NotificationsState>(
      'calls getMesNotifications when membreId is null',
      build: buildBloc,
      setUp: () =>
          when(mockRepository.getMesNotifications()).thenAnswer((_) async => notifs),
      act: (b) => b.add(const LoadNotifications()),
      verify: (_) {
        verify(mockRepository.getMesNotifications()).called(1);
        verifyNever(mockRepository.getNotificationsByMembre(any));
      },
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'calls getMesNotifications when membreId is empty string',
      build: buildBloc,
      setUp: () =>
          when(mockRepository.getMesNotifications()).thenAnswer((_) async => notifs),
      act: (b) => b.add(const LoadNotifications(membreId: '')),
      verify: (_) {
        verify(mockRepository.getMesNotifications()).called(1);
      },
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'calls getNotificationsByMembre when membreId is provided',
      build: buildBloc,
      setUp: () => when(mockRepository.getNotificationsByMembre('membre-42'))
          .thenAnswer((_) async => notifs),
      act: (b) => b.add(const LoadNotifications(membreId: 'membre-42')),
      verify: (_) {
        verify(mockRepository.getNotificationsByMembre('membre-42')).called(1);
        verifyNever(mockRepository.getMesNotifications());
      },
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'emits [Loading, Loaded] with correct nonLuesCount',
      build: buildBloc,
      setUp: () =>
          when(mockRepository.getMesNotifications()).thenAnswer((_) async => notifs),
      act: (b) => b.add(const LoadNotifications()),
      expect: () => [
        const NotificationsLoading(),
        isA<NotificationsLoaded>()
            .having((s) => s.notifications.length, 'count', 2)
            .having((s) => s.nonLuesCount, 'nonLues', 1),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'emits [Loading, Loaded(empty)] when no notifications',
      build: buildBloc,
      setUp: () =>
          when(mockRepository.getMesNotifications()).thenAnswer((_) async => []),
      act: (b) => b.add(const LoadNotifications()),
      expect: () => [
        const NotificationsLoading(),
        const NotificationsLoaded(notifications: [], nonLuesCount: 0),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'emits [Loading, Error] with 401 message on DioException 401',
      build: buildBloc,
      setUp: () => when(mockRepository.getMesNotifications())
          .thenThrow(_makeDioException(statusCode: 401)),
      act: (b) => b.add(const LoadNotifications()),
      expect: () => [
        const NotificationsLoading(),
        isA<NotificationsError>()
            .having((e) => e.message, 'message', 'Non autorisé.'),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'emits [Loading, Error] with 403 message on DioException 403',
      build: buildBloc,
      setUp: () => when(mockRepository.getMesNotifications())
          .thenThrow(_makeDioException(statusCode: 403)),
      act: (b) => b.add(const LoadNotifications()),
      expect: () => [
        const NotificationsLoading(),
        isA<NotificationsError>()
            .having((e) => e.message, 'message', 'Accès refusé.'),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'emits [Loading, Error] with server error on DioException 500',
      build: buildBloc,
      setUp: () => when(mockRepository.getMesNotifications())
          .thenThrow(_makeDioException(statusCode: 500)),
      act: (b) => b.add(const LoadNotifications()),
      expect: () => [
        const NotificationsLoading(),
        isA<NotificationsError>()
            .having((e) => e.message, 'message', 'Erreur serveur.'),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'emits [Loading, Error] with network error on connection error',
      build: buildBloc,
      setUp: () => when(mockRepository.getMesNotifications())
          .thenThrow(_makeDioException()),
      act: (b) => b.add(const LoadNotifications()),
      expect: () => [
        const NotificationsLoading(),
        isA<NotificationsError>()
            .having((e) => e.message, 'message', contains('réseau')),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'emits [Loading, Error] on generic exception',
      build: buildBloc,
      setUp: () =>
          when(mockRepository.getMesNotifications()).thenThrow(Exception('unexpected')),
      act: (b) => b.add(const LoadNotifications()),
      expect: () => [
        const NotificationsLoading(),
        isA<NotificationsError>()
            .having((e) => e.message, 'message', contains('chargement')),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'swallows DioException.cancel (no error emitted)',
      build: buildBloc,
      setUp: () => when(mockRepository.getMesNotifications()).thenThrow(
        _makeDioException(type: DioExceptionType.cancel),
      ),
      act: (b) => b.add(const LoadNotifications()),
      expect: () => [const NotificationsLoading()],
    );
  });

  // ─── MarkNotificationAsRead ───────────────────────────────────────────────

  group('MarkNotificationAsRead', () {
    final unread = _makeNotification(id: 'notif-1');
    final read = _makeNotification(id: 'notif-2', read: true);
    final loadedState = NotificationsLoaded(
      notifications: [unread, read],
      nonLuesCount: 1,
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'emits NotificationMarkedAsRead with updated list and decremented count',
      build: buildBloc,
      seed: () => loadedState,
      setUp: () =>
          when(mockRepository.marquerCommeLue('notif-1')).thenAnswer((_) async {}),
      act: (b) => b.add(const MarkNotificationAsRead('notif-1')),
      expect: () => [
        isA<NotificationMarkedAsRead>()
            .having((s) => s.nonLuesCount, 'nonLues', 0)
            .having(
              (s) => s.notifications.firstWhere((n) => n.id == 'notif-1').statut,
              'statut',
              'LUE',
            ),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'does nothing when state is not NotificationsLoaded',
      build: buildBloc,
      act: (b) => b.add(const MarkNotificationAsRead('notif-1')),
      expect: () => [],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'emits Error when marquerCommeLue throws',
      build: buildBloc,
      seed: () => loadedState,
      setUp: () =>
          when(mockRepository.marquerCommeLue(any)).thenThrow(Exception('fail')),
      act: (b) => b.add(const MarkNotificationAsRead('notif-1')),
      expect: () => [
        isA<NotificationsError>()
            .having((e) => e.message, 'message', contains('marquer')),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'swallows DioException.cancel in markAsRead',
      build: buildBloc,
      seed: () => loadedState,
      setUp: () => when(mockRepository.marquerCommeLue(any)).thenThrow(
        _makeDioException(type: DioExceptionType.cancel),
      ),
      act: (b) => b.add(const MarkNotificationAsRead('notif-1')),
      expect: () => [],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'notification not in list is left unchanged',
      build: buildBloc,
      seed: () => loadedState,
      setUp: () =>
          when(mockRepository.marquerCommeLue('unknown')).thenAnswer((_) async {}),
      act: (b) => b.add(const MarkNotificationAsRead('unknown')),
      expect: () => [
        isA<NotificationMarkedAsRead>()
            .having((s) => s.nonLuesCount, 'nonLues', 1), // unchanged
      ],
    );
  });

  // ─── RefreshNotifications ─────────────────────────────────────────────────

  group('RefreshNotifications', () {
    final notifs = [_makeNotification()];

    blocTest<NotificationsBloc, NotificationsState>(
      'triggers LoadNotifications with null membreId',
      build: buildBloc,
      setUp: () =>
          when(mockRepository.getMesNotifications()).thenAnswer((_) async => notifs),
      act: (b) => b.add(const RefreshNotifications()),
      expect: () => [
        const NotificationsLoading(),
        isA<NotificationsLoaded>(),
      ],
    );

    blocTest<NotificationsBloc, NotificationsState>(
      'triggers LoadNotifications with given membreId',
      build: buildBloc,
      setUp: () => when(mockRepository.getNotificationsByMembre('m-99'))
          .thenAnswer((_) async => notifs),
      act: (b) => b.add(const RefreshNotifications('m-99')),
      expect: () => [
        const NotificationsLoading(),
        isA<NotificationsLoaded>(),
      ],
      verify: (_) {
        verify(mockRepository.getNotificationsByMembre('m-99')).called(1);
      },
    );
  });

  // ─── NotificationModel helpers ────────────────────────────────────────────

  group('NotificationModel', () {
    test('estLue is true when statut == LUE', () {
      final n = _makeNotification(statut: 'LUE');
      expect(n.estLue, true);
    });

    test('estLue is true when dateLecture is set', () {
      final n = NotificationModel(
        id: 'x',
        typeNotification: 'SYSTEME',
        dateLecture: DateTime.now(),
      );
      expect(n.estLue, true);
    });

    test('estLue is false when neither statut nor dateLecture', () {
      final n = _makeNotification();
      expect(n.estLue, false);
    });

    test('typeAffichage returns correct labels', () {
      expect(
        NotificationModel(id: 'x', typeNotification: 'EVENEMENT').typeAffichage,
        'Événements',
      );
      expect(
        NotificationModel(id: 'x', typeNotification: 'COTISATION').typeAffichage,
        'Cotisations',
      );
      expect(
        NotificationModel(id: 'x', typeNotification: 'UNKNOWN').typeAffichage,
        'Système',
      );
    });
  });
}