feat(content_management): add shared data loading functionality

- Implement loading of countries and languages in ContentManagementBloc
- Add SharedDataRequested event
- Extend ContentManagementState to include countries and languages data
- Implement fetchAll helper function for efficient data retrieval
- Add error handling for data loading operations

Author: fulleni

lib/content_management/bloc/content_management_bloc.dart

@@ -24,10 +24,15 @@ class ContentManagementBloc
     required DataRepository<Headline> headlinesRepository,
     required DataRepository<Topic> topicsRepository,
     required DataRepository<Source> sourcesRepository,
-  }) : _headlinesRepository = headlinesRepository,
-       _topicsRepository = topicsRepository,
-       _sourcesRepository = sourcesRepository,
-       super(const ContentManagementState()) {
+    required DataRepository<Country> countriesRepository,
+    required DataRepository<Language> languagesRepository,
+  })  : _headlinesRepository = headlinesRepository,
+        _topicsRepository = topicsRepository,
+        _sourcesRepository = sourcesRepository,
+        _countriesRepository = countriesRepository,
+        _languagesRepository = languagesRepository,
+        super(const ContentManagementState()) {
+    on<SharedDataRequested>(_onSharedDataRequested);
     on<ContentManagementTabChanged>(_onContentManagementTabChanged);
     on<LoadHeadlinesRequested>(_onLoadHeadlinesRequested);
     on<HeadlineUpdated>(_onHeadlineUpdated);
@@ -43,6 +48,94 @@ class ContentManagementBloc
   final DataRepository<Headline> _headlinesRepository;
   final DataRepository<Topic> _topicsRepository;
   final DataRepository<Source> _sourcesRepository;
+  final DataRepository<Country> _countriesRepository;
+  final DataRepository<Language> _languagesRepository;
+
+  Future<void> _onSharedDataRequested(
+    SharedDataRequested event,
+    Emitter<ContentManagementState> emit,
+  ) async {
+    // Helper function to fetch all items of a given type.
+    Future<List<T>> fetchAll<T>({
+      required DataRepository<T> repository,
+      required List<SortOption> sort,
+    }) async {
+      final allItems = <T>[];
+      String? cursor;
+      bool hasMore;
+
+      do {
+        final response = await repository.readAll(
+          sort: sort,
+          pagination: PaginationOptions(cursor: cursor),
+          filter: {'status': ContentStatus.active.name},
+        );
+        allItems.addAll(response.items);
+        cursor = response.cursor;
+        hasMore = response.hasMore;
+      } while (hasMore);
+
+      return allItems;
+    }
+
+    // Check if data is already loaded or is currently loading to prevent
+    // redundant fetches.
+    if (state.allCountriesStatus == ContentManagementStatus.success &&
+        state.allLanguagesStatus == ContentManagementStatus.success) {
+      return;
+    }
+
+    // Set loading status for both lists.
+    emit(
+      state.copyWith(
+        allCountriesStatus: ContentManagementStatus.loading,
+        allLanguagesStatus: ContentManagementStatus.loading,
+      ),
+    );
+
+    try {
+      // Fetch both lists in parallel.
+      final results = await Future.wait([
+        fetchAll<Country>(
+          repository: _countriesRepository,
+          sort: [const SortOption('name', SortOrder.asc)],
+        ),
+        fetchAll<Language>(
+          repository: _languagesRepository,
+          sort: [const SortOption('name', SortOrder.asc)],
+        ),
+      ]);
+
+      final countries = results[0] as List<Country>;
+      final languages = results[1] as List<Language>;
+
+      // Update the state with the complete lists.
+      emit(
+        state.copyWith(
+          allCountries: countries,
+          allCountriesStatus: ContentManagementStatus.success,
+          allLanguages: languages,
+          allLanguagesStatus: ContentManagementStatus.success,
+        ),
+      );
+    } on HttpException catch (e) {
+      emit(
+        state.copyWith(
+          allCountriesStatus: ContentManagementStatus.failure,
+          allLanguagesStatus: ContentManagementStatus.failure,
+          exception: e,
+        ),
+      );
+    } catch (e) {
+      emit(
+        state.copyWith(
+          allCountriesStatus: ContentManagementStatus.failure,
+          allLanguagesStatus: ContentManagementStatus.failure,
+          exception: UnknownException('An unexpected error occurred: $e'),
+        ),
+      );
+    }
+  }
 
   void _onContentManagementTabChanged(
     ContentManagementTabChanged event,

lib/content_management/bloc/content_management_event.dart

@@ -155,3 +155,12 @@ final class SourceUpdated extends ContentManagementEvent {
   @override
   List<Object?> get props => [source];
 }
+
+/// {@template shared_data_requested}
+/// Event to request loading of shared data like countries and languages.
+/// This should be dispatched once when the content management section is loaded.
+/// {@endtemplate}
+final class SharedDataRequested extends ContentManagementEvent {
+  /// {@macro shared_data_requested}
+  const SharedDataRequested();
+}

lib/content_management/bloc/content_management_state.dart

@@ -32,6 +32,10 @@ class ContentManagementState extends Equatable {
     this.sources = const [],
     this.sourcesCursor,
     this.sourcesHasMore = false,
+    this.allCountriesStatus = ContentManagementStatus.initial,
+    this.allCountries = const [],
+    this.allLanguagesStatus = ContentManagementStatus.initial,
+    this.allLanguages = const [],
     this.exception,
   });
 
@@ -74,6 +78,18 @@ class ContentManagementState extends Equatable {
   /// Indicates if there are more sources to load.
   final bool sourcesHasMore;
 
+  /// Status of all countries data operations.
+  final ContentManagementStatus allCountriesStatus;
+
+  /// Cached list of all countries.
+  final List<Country> allCountries;
+
+  /// Status of all languages data operations.
+  final ContentManagementStatus allLanguagesStatus;
+
+  /// Cached list of all languages.
+  final List<Language> allLanguages;
+
   /// The error describing an operation failure, if any.
   final HttpException? exception;
 
@@ -92,6 +108,10 @@ class ContentManagementState extends Equatable {
     List<Source>? sources,
     String? sourcesCursor,
     bool? sourcesHasMore,
+    ContentManagementStatus? allCountriesStatus,
+    List<Country>? allCountries,
+    ContentManagementStatus? allLanguagesStatus,
+    List<Language>? allLanguages,
     HttpException? exception,
   }) {
     return ContentManagementState(
@@ -108,6 +128,10 @@ class ContentManagementState extends Equatable {
       sources: sources ?? this.sources,
       sourcesCursor: sourcesCursor ?? this.sourcesCursor,
       sourcesHasMore: sourcesHasMore ?? this.sourcesHasMore,
+      allCountriesStatus: allCountriesStatus ?? this.allCountriesStatus,
+      allCountries: allCountries ?? this.allCountries,
+      allLanguagesStatus: allLanguagesStatus ?? this.allLanguagesStatus,
+      allLanguages: allLanguages ?? this.allLanguages,
       exception: exception ?? this.exception,
     );
   }
@@ -127,6 +151,10 @@ class ContentManagementState extends Equatable {
     sources,
     sourcesCursor,
     sourcesHasMore,
+    allCountriesStatus,
+    allCountries,
+    allLanguagesStatus,
+    allLanguages,
     exception,
   ];
 }