news page

lib/features/news/presentation/providers/news_provider.dart

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+/// News Providers
+///
+/// State management for news articles using Riverpod.
+/// Provides access to news data and filtering capabilities.
+library;
+
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:worker/features/news/data/datasources/news_local_datasource.dart';
+import 'package:worker/features/news/data/repositories/news_repository_impl.dart';
+import 'package:worker/features/news/domain/entities/news_article.dart';
+import 'package:worker/features/news/domain/repositories/news_repository.dart';
+
+part 'news_provider.g.dart';
+
+/// News Local DataSource Provider
+///
+/// Provides instance of NewsLocalDataSource.
+@riverpod
+NewsLocalDataSource newsLocalDataSource(Ref ref) {
+  return NewsLocalDataSource();
+}
+
+/// News Repository Provider
+///
+/// Provides instance of NewsRepository implementation.
+@riverpod
+NewsRepository newsRepository(Ref ref) {
+  final localDataSource = ref.watch(newsLocalDataSourceProvider);
+  return NewsRepositoryImpl(localDataSource: localDataSource);
+}
+
+/// News Articles Provider
+///
+/// Fetches all news articles sorted by published date.
+/// Returns AsyncValue<List<NewsArticle>> for proper loading/error handling.
+@riverpod
+Future<List<NewsArticle>> newsArticles(Ref ref) async {
+  final repository = ref.watch(newsRepositoryProvider);
+  return repository.getAllArticles();
+}
+
+/// Featured Article Provider
+///
+/// Fetches the featured article for the top section.
+/// Returns AsyncValue<NewsArticle?> (null if no featured article).
+@riverpod
+Future<NewsArticle?> featuredArticle(Ref ref) async {
+  final repository = ref.watch(newsRepositoryProvider);
+  return repository.getFeaturedArticle();
+}
+
+/// Selected News Category Provider
+///
+/// Manages the currently selected category filter.
+/// null means "All" is selected (show all categories).
+@riverpod
+class SelectedNewsCategory extends _$SelectedNewsCategory {
+  @override
+  NewsCategory? build() {
+    // Default: show all categories
+    return null;
+  }
+
+  /// Set selected category
+  void setCategory(NewsCategory? category) {
+    state = category;
+  }
+
+  /// Clear selection (show all)
+  void clearSelection() {
+    state = null;
+  }
+}
+
+/// Filtered News Articles Provider
+///
+/// Returns news articles filtered by selected category.
+/// If no category is selected, returns all articles.
+@riverpod
+Future<List<NewsArticle>> filteredNewsArticles(Ref ref) async {
+  final selectedCategory = ref.watch(selectedNewsCategoryProvider);
+  final repository = ref.watch(newsRepositoryProvider);
+
+  // If no category selected, return all articles
+  if (selectedCategory == null) {
+    return repository.getAllArticles();
+  }
+
+  // Filter by selected category
+  return repository.getArticlesByCategory(selectedCategory);
+}
+
+/// News Article by ID Provider
+///
+/// Fetches a specific article by ID.
+/// Used for article detail page.
+@riverpod
+Future<NewsArticle?> newsArticleById(Ref ref, String articleId) async {
+  final repository = ref.watch(newsRepositoryProvider);
+  return repository.getArticleById(articleId);
+}