add price policy

lib/features/price_policy/data/repositories/price_policy_repository_impl.dart

@@ -0,0 +1,134 @@
+/// Repository Implementation: Price Policy Repository
+///
+/// Concrete implementation of the PricePolicyRepository interface.
+/// Coordinates between local and remote data sources to provide price policy data.
+///
+/// Currently uses mock data from local datasource.
+/// Will implement offline-first strategy when backend API is available.
+library;
+
+import 'package:worker/features/price_policy/data/datasources/price_policy_local_datasource.dart';
+import 'package:worker/features/price_policy/domain/entities/price_document.dart';
+import 'package:worker/features/price_policy/domain/repositories/price_policy_repository.dart';
+
+/// Price Policy Repository Implementation
+///
+/// Responsibilities:
+/// - Coordinate between local cache and remote API (when available)
+/// - Convert data models to domain entities
+/// - Handle errors gracefully
+/// - Manage cache invalidation
+class PricePolicyRepositoryImpl implements PricePolicyRepository {
+  /// Local data source
+  final PricePolicyLocalDataSource localDataSource;
+
+  /// Remote data source (API) - TODO: Add when API is ready
+  // final PricePolicyRemoteDataSource remoteDataSource;
+
+  /// Constructor
+  PricePolicyRepositoryImpl({
+    required this.localDataSource,
+    // required this.remoteDataSource, // TODO: Add when API ready
+  });
+
+  @override
+  Future<List<PriceDocument>> getAllDocuments() async {
+    try {
+      // TODO: Implement offline-first strategy
+      // 1. Check if cache is valid
+      // 2. Return cached data if valid
+      // 3. If cache invalid, fetch from remote
+
+      // For now, get from local datasource (mock data)
+      final models = await localDataSource.getAllDocuments();
+
+      // Convert models to entities
+      final entities = models.map((model) => model.toEntity()).toList();
+
+      // Sort by published date (newest first)
+      entities.sort((a, b) => b.publishedDate.compareTo(a.publishedDate));
+
+      return entities;
+    } catch (e) {
+      // Log error and return empty list
+      // In production, this should throw proper domain failures
+      print('[PricePolicyRepository] Error getting documents: $e');
+      return [];
+    }
+  }
+
+  @override
+  Future<List<PriceDocument>> getDocumentsByCategory(
+    DocumentCategory category,
+  ) async {
+    try {
+      // Convert category to string for datasource
+      final categoryString = _categoryToString(category);
+
+      // Get documents from local datasource
+      final models = await localDataSource.getDocumentsByCategory(
+        categoryString,
+      );
+
+      // Convert models to entities
+      final entities = models.map((model) => model.toEntity()).toList();
+
+      // Sort by published date (newest first)
+      entities.sort((a, b) => b.publishedDate.compareTo(a.publishedDate));
+
+      return entities;
+    } catch (e) {
+      print('[PricePolicyRepository] Error getting documents by category: $e');
+      return [];
+    }
+  }
+
+  @override
+  Future<PriceDocument?> getDocumentById(String documentId) async {
+    try {
+      // Get document from local datasource
+      final model = await localDataSource.getDocumentById(documentId);
+
+      // Convert model to entity
+      return model?.toEntity();
+    } catch (e) {
+      print('[PricePolicyRepository] Error getting document by id: $e');
+      return null;
+    }
+  }
+
+  @override
+  Future<List<PriceDocument>> refreshDocuments() async {
+    try {
+      // TODO: Implement remote fetch when API is available
+      // 1. Fetch from remote API
+      // 2. Cache the results locally
+      // 3. Return fresh data
+
+      // For now, just clear and refetch from local
+      await localDataSource.clearCache();
+      final models = await localDataSource.getAllDocuments();
+
+      // Convert models to entities
+      final entities = models.map((model) => model.toEntity()).toList();
+
+      // Sort by published date (newest first)
+      entities.sort((a, b) => b.publishedDate.compareTo(a.publishedDate));
+
+      return entities;
+    } catch (e) {
+      print('[PricePolicyRepository] Error refreshing documents: $e');
+      return [];
+    }
+  }
+
+  /// Helper method to convert category enum to string
+  String _categoryToString(DocumentCategory category) {
+    switch (category) {
+      case DocumentCategory.policy:
+        return 'policy';
+      case DocumentCategory.priceList:
+        return 'priceList';
+    }
+  }
+}