import 'package:flutter_bloc/flutter_bloc.dart';
import 'dart:developer' as dev;
import '../../domain/usecase/get_notifications_usecase.dart';
import '../event/notifications_event.dart';
import '../state/notifications_state.dart';

class NotificationsBloc extends Bloc<NotificationsEvent, NotificationsState> {
  final GetNotificationsUsecase _getNotificationsUsecase;

  NotificationsBloc(this._getNotificationsUsecase) : super(const NotificationsState()) {
    on<NotificationsFetchRequested>(_onFetchRequested);
    on<NotificationsLoadMoreRequested>(_onLoadMoreRequested);
  }

  Future<void> _onFetchRequested(
      NotificationsFetchRequested event,
      Emitter<NotificationsState> emit,
      ) async {
    if (event.page == 1) {
      emit(state.copyWith(status: NotificationsStatus.loading));
    }

    try {
      final result = await _getNotificationsUsecase(
        page: event.page,
        pageSize: 100,
      );

      final newNotifications = event.page == 1
          ? result.notifications
          : [...state.notifications, ...result.notifications];

      emit(state.copyWith(
        status: NotificationsStatus.success,
        notifications: newNotifications,
        currentPage: result.pagination.currentPage,
        totalPages: result.pagination.lastPage,
        hasMore: result.pagination.currentPage < result.pagination.lastPage,
        isLoadingMore: false,
      ));
    } catch (e) {
      dev.log('NotificationsBloc: Ошибка загрузки: $e');
      emit(state.copyWith(
        status: event.page == 1 ? NotificationsStatus.failure : NotificationsStatus.success,
        errorMessage: event.page == 1 ? e.toString() : null,
        isLoadingMore: false,
      ));
    }
  }

  Future<void> _onLoadMoreRequested(
      NotificationsLoadMoreRequested event,
      Emitter<NotificationsState> emit,
      ) async {
    if (!state.hasMore || state.isLoadingMore) return;

    emit(state.copyWith(isLoadingMore: true));
    final nextPage = state.currentPage + 1;
    add(NotificationsFetchRequested(page: nextPage));
  }
}