eatvio_app/lib/features/notifications/presentation/notifications_cubit/notifications_cubit.dart

import 'dart:async';
import 'dart:convert';
import 'dart:developer';

import 'package:eatvio_app/core/websockets/ws_manager.dart';
import 'package:eatvio_app/features/notifications/models/notification_model.dart';
import 'package:eatvio_app/features/notifications/presentation/notifications_cubit/notifications_state.dart';
import 'package:eatvio_app/features/notifications/repository/notifications_repository.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class NotificationsCubit extends Cubit<NotificationsState> {
  final List<BaseNotificationModel> _notifications = [];
  final WsManager wsManager;
  final NotificationsRepository notificationsRepository;
  StreamSubscription? _newNotificationsSubscription;
  NotificationsCubit({
    required this.wsManager,
    required this.notificationsRepository,
  }) : super(const NotificationsState.empty());

  Future<void> connectToWebSocket() async {
    await _newNotificationsSubscription?.cancel();
    _newNotificationsSubscription = wsManager.newNotificationsStream?.listen((event) {
      _handleNotification(event.data);
    });
  }

  BaseNotificationModel _parseNotification(Map<String, dynamic> notificationJson, NotificationType type) {
    try {
      return switch (type) {
        NotificationType.planSubscriptionStartedToAuthor => PlanSubscriptionStartedToAuthorNotification.fromJson(notificationJson, type),
        NotificationType.planSubscriptionCanceledToAuthor => PlanSubscriptionCanceledToAuthorNotification.fromJson(notificationJson, type),
        NotificationType.chosenPlanStartedToClientNotification => ChosenPlanStartedToClientNotification.fromJson(notificationJson, type),
        NotificationType.chosenPlanTomorrowReminderToClientNotification => ChosenPlanTomorrowReminderToClientNotification.fromJson(notificationJson, type),
        NotificationType.diaryReminderNotification => DiaryReminderNotification.fromJson(notificationJson, type),
        NotificationType.consultantLeftComment => ConsultantLeftCommentNotification.fromJson(notificationJson, type),
        NotificationType.personalizedDietIsDefined => PersonalizedDietIsDefinedNotification.fromJson(notificationJson, type),
        NotificationType.chosenPlanFinishedToClient => ChosenPlanFinishedToClientNotification.fromJson(notificationJson, type),
        NotificationType.planSubscriptionCanceledToCustomer => PlanSubscriptionCanceledToAuthorNotification.fromJson(notificationJson, type),
        NotificationType.chosenPlanStartedToConsultantNotification => ChosenPlanStartedToConsultantNotification.fromJson(notificationJson, type),
        NotificationType.chosenPlanTomorrowReminderToConsultantNotification =>
          ChosenPlanTomorrowReminderToConsultantNotification.fromJson(notificationJson, type),
        NotificationType.planSubscriptionPaidToAuthor => PlanSubscriptionPaidToAuthorNotification.fromJson(notificationJson, type),
        NotificationType.chosenPlanFinishedToConsultant => ChosenPlanFinishedToConsultantNotification.fromJson(notificationJson, type),
        NotificationType.chosenPlanLastDayFinishedForUser => ChosenPlanLastDayFinishedForUser.fromJson(notificationJson, type),
        NotificationType.unknown => UnknownNotification(type: type),
      };
    } catch (e) {
      return UnknownNotification(type: NotificationType.unknown);
    }
  }

  void _handleNotification(String notificationData) {
    final json = jsonDecode(notificationData) as Map<String, dynamic>;
    final stringifiedType = json['notification_class_name'];
    final type = NotificationType.getTypeFromString(stringifiedType);
    final notification = _parseNotification(json, type);
    _notifications.insert(0, notification);
    emit(
      NotificationsState.loaded(
        notifications: _notifications,
        notificationsCount: _notifications.length,
        hasUnreadNotifications: true,
      ),
    );
  }

  Future<void> getNotifications() async {
    try {
      final notifications = await notificationsRepository.getNotifications(page: 1);
      _notifications.clear();
      _notifications.addAll(notifications ?? []);
      emit(
        NotificationsState.loaded(
          notifications: _notifications,
          notificationsCount: _notifications.length,
          hasUnreadNotifications: (notifications ?? []).where((elem) => elem.isRead == false).isNotEmpty,
        ),
      );
    } catch (e, st) {
      log(e.toString(), stackTrace: st);
    }
  }

  Future<void> markNotificationsAsRead() async {
    final currentState = state;
    if (currentState is NotificationsStateLoaded) {
      try {
        emit(currentState.copyWith(isLoading: true));
        await notificationsRepository.markNotificationsAsRead();
        await getNotifications();
        emit(currentState.copyWith(isLoading: false, hasUnreadNotifications: false));
      } catch (e, st) {
        log(e.toString(), stackTrace: st);
        emit(currentState.copyWith(isLoading: false));
      }
    }
  }
}