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lib/core/di/providers.dart

@@ -5,6 +5,7 @@ import '../../features/auth/data/repositories/auth_repository_impl.dart';
 import '../../features/auth/domain/repositories/auth_repository.dart';
 import '../../features/auth/domain/usecases/login_usecase.dart';
 import '../../features/auth/presentation/providers/auth_provider.dart';
+import '../../features/products/data/datasources/products_local_datasource.dart';
 import '../../features/products/data/datasources/products_remote_datasource.dart';
 import '../../features/products/data/repositories/products_repository_impl.dart';
 import '../../features/products/domain/entities/product_stage_entity.dart';
@@ -256,6 +257,12 @@ final warehouseErrorProvider = Provider<String?>((ref) {
 
 // Data Layer
 
+/// Products local data source provider
+/// Handles local storage operations for products using Hive
+final productsLocalDataSourceProvider = Provider<ProductsLocalDataSource>((ref) {
+  return ProductsLocalDataSourceImpl();
+});
+
 /// Products remote data source provider
 /// Handles API calls for products
 final productsRemoteDataSourceProvider =
@@ -266,9 +273,14 @@ final productsRemoteDataSourceProvider =
 
 /// Products repository provider
 /// Implements domain repository interface
+/// Coordinates between local and remote data sources
 final productsRepositoryProvider = Provider<ProductsRepository>((ref) {
   final remoteDataSource = ref.watch(productsRemoteDataSourceProvider);
-  return ProductsRepositoryImpl(remoteDataSource);
+  final localDataSource = ref.watch(productsLocalDataSourceProvider);
+  return ProductsRepositoryImpl(
+    remoteDataSource: remoteDataSource,
+    localDataSource: localDataSource,
+  );
 });
 
 // Domain Layer

lib/core/utils/text_utils.dart

@@ -0,0 +1,86 @@
+/// Utility functions for text processing
+class TextUtils {
+  /// Convert Vietnamese characters to English (non-accented) characters
+  /// Example: "Tuấn" -> "tuan", "Hồ Chí Minh" -> "ho chi minh"
+  static String removeVietnameseAccents(String text) {
+    if (text.isEmpty) return text;
+
+    // Convert to lowercase for consistent comparison
+    String result = text.toLowerCase();
+
+    // Map of Vietnamese characters to their non-accented equivalents
+    const vietnameseMap = {
+      // a with accents
+      'á': 'a', 'à': 'a', 'ả': 'a', 'ã': 'a', 'ạ': 'a',
+      'ă': 'a', 'ắ': 'a', 'ằ': 'a', 'ẳ': 'a', 'ẵ': 'a', 'ặ': 'a',
+      'â': 'a', 'ấ': 'a', 'ầ': 'a', 'ẩ': 'a', 'ẫ': 'a', 'ậ': 'a',
+
+      // e with accents
+      'é': 'e', 'è': 'e', 'ẻ': 'e', 'ẽ': 'e', 'ẹ': 'e',
+      'ê': 'e', 'ế': 'e', 'ề': 'e', 'ể': 'e', 'ễ': 'e', 'ệ': 'e',
+
+      // i with accents
+      'í': 'i', 'ì': 'i', 'ỉ': 'i', 'ĩ': 'i', 'ị': 'i',
+
+      // o with accents
+      'ó': 'o', 'ò': 'o', 'ỏ': 'o', 'õ': 'o', 'ọ': 'o',
+      'ô': 'o', 'ố': 'o', 'ồ': 'o', 'ổ': 'o', 'ỗ': 'o', 'ộ': 'o',
+      'ơ': 'o', 'ớ': 'o', 'ờ': 'o', 'ở': 'o', 'ỡ': 'o', 'ợ': 'o',
+
+      // u with accents
+      'ú': 'u', 'ù': 'u', 'ủ': 'u', 'ũ': 'u', 'ụ': 'u',
+      'ư': 'u', 'ứ': 'u', 'ừ': 'u', 'ử': 'u', 'ữ': 'u', 'ự': 'u',
+
+      // y with accents
+      'ý': 'y', 'ỳ': 'y', 'ỷ': 'y', 'ỹ': 'y', 'ỵ': 'y',
+
+      // d with stroke
+      'đ': 'd',
+    };
+
+    // Replace each Vietnamese character with its non-accented equivalent
+    vietnameseMap.forEach((vietnamese, english) {
+      result = result.replaceAll(vietnamese, english);
+    });
+
+    return result;
+  }
+
+  /// Normalize text for search (lowercase + remove accents)
+  static String normalizeForSearch(String text) {
+    return removeVietnameseAccents(text.toLowerCase().trim());
+  }
+
+  /// Check if a text contains a search term (Vietnamese-aware, case-insensitive)
+  ///
+  /// Example:
+  /// ```dart
+  /// containsVietnameseSearch("Nguyễn Văn Tuấn", "tuan") // returns true
+  /// containsVietnameseSearch("tuan@example.com", "TUAN") // returns true
+  /// ```
+  static bool containsVietnameseSearch(String text, String searchTerm) {
+    if (searchTerm.isEmpty) return true;
+    if (text.isEmpty) return false;
+
+    final normalizedText = normalizeForSearch(text);
+    final normalizedSearch = normalizeForSearch(searchTerm);
+
+    return normalizedText.contains(normalizedSearch);
+  }
+
+  /// Check if any of the provided texts contains the search term
+  static bool containsVietnameseSearchInAny(
+    List<String> texts,
+    String searchTerm,
+  ) {
+    if (searchTerm.isEmpty) return true;
+
+    for (final text in texts) {
+      if (containsVietnameseSearch(text, searchTerm)) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+}