109 lines
3.3 KiB
Dart
109 lines
3.3 KiB
Dart
import 'dart:async';
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import 'package:flutter_bloc/flutter_bloc.dart';
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import 'package:finlytic_app/features/news/repositories/news_repository.dart';
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import 'news_event.dart';
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import 'news_state.dart';
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class NewsBloc extends Bloc<NewsEvent, NewsState> {
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final NewsRepository repository;
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static const int pageSize = 20;
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StreamSubscription? _liveNewsSubscription;
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NewsBloc({required this.repository}) : super(NewsInitial()) {
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on<FetchNews>(_onFetchNews);
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on<LoadMoreNews>(_onLoadMoreNews);
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on<ReceiveLiveNews>(_onReceiveLiveNews);
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// Subscribe to live news from SignalR
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_liveNewsSubscription = repository.liveNewsStream.listen((article) {
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add(ReceiveLiveNews(article));
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});
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// Connect to SignalR
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repository.connectToLiveFeed();
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}
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Future<void> _onFetchNews(FetchNews event, Emitter<NewsState> emit) async {
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try {
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emit(NewsLoading());
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final articles = await repository.fetchNews(
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page: 1,
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pageSize: pageSize,
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symbol: event.symbol,
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isin: event.isin,
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date: event.date,
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);
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emit(NewsLoaded(
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articles: articles,
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hasReachedMax: articles.length < pageSize,
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currentPage: 1,
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symbol: event.symbol,
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isin: event.isin,
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date: event.date,
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));
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} catch (e) {
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emit(NewsError("Failed to fetch news. Please try again."));
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}
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}
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Future<void> _onLoadMoreNews(LoadMoreNews event, Emitter<NewsState> emit) async {
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if (state is NewsLoaded) {
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final currentState = state as NewsLoaded;
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if (currentState.hasReachedMax) return;
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try {
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final nextPage = currentState.currentPage + 1;
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final articles = await repository.fetchNews(
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page: nextPage,
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pageSize: pageSize,
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symbol: currentState.symbol,
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isin: currentState.isin,
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date: currentState.date,
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);
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if (articles.isEmpty) {
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emit(currentState.copyWith(hasReachedMax: true));
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} else {
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emit(NewsLoaded(
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articles: currentState.articles + articles,
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hasReachedMax: articles.length < pageSize,
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currentPage: nextPage,
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symbol: currentState.symbol,
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isin: currentState.isin,
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date: currentState.date,
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));
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}
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} catch (e) {
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emit(NewsError("Failed to load more news."));
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}
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}
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}
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void _onReceiveLiveNews(ReceiveLiveNews event, Emitter<NewsState> emit) {
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if (state is NewsLoaded) {
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final currentState = state as NewsLoaded;
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// Check if the article matches current filters before prepending
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bool matchesFilter = true;
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if (currentState.symbol != null || currentState.isin != null) {
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// Needs proper matching logic if needed, but for now we prepend if there's no filter or if it matches
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// Assuming we prepend it regardless for live feed, or we could filter based on MatchedAssets if added to model.
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}
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if (matchesFilter) {
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// Prepend new article to the top of the list!
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final updatedArticles = [event.article, ...currentState.articles];
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emit(currentState.copyWith(articles: updatedArticles));
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}
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}
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}
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@override
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Future<void> close() {
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_liveNewsSubscription?.cancel();
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repository.dispose();
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return super.close();
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}
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}
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