add detail, fetch products, categories

lib/features/categories/data/datasources/category_remote_datasource.dart

@@ -0,0 +1,51 @@
+import '../models/category_model.dart';
+import '../../../../core/network/dio_client.dart';
+import '../../../../core/constants/api_constants.dart';
+import '../../../../core/errors/exceptions.dart';
+
+/// Category remote data source using API
+abstract class CategoryRemoteDataSource {
+  Future<List<CategoryModel>> getAllCategories();
+  Future<CategoryModel> getCategoryById(String id);
+}
+
+class CategoryRemoteDataSourceImpl implements CategoryRemoteDataSource {
+  final DioClient client;
+
+  CategoryRemoteDataSourceImpl(this.client);
+
+  @override
+  Future<List<CategoryModel>> getAllCategories() async {
+    try {
+      final response = await client.get(ApiConstants.categories);
+
+      // API returns: { success: true, data: [...categories...] }
+      if (response.data['success'] == true) {
+        final List<dynamic> data = response.data['data'] ?? [];
+        return data.map((json) => CategoryModel.fromJson(json)).toList();
+      } else {
+        throw ServerException(response.data['message'] ?? 'Failed to fetch categories');
+      }
+    } catch (e) {
+      if (e is ServerException) rethrow;
+      throw ServerException('Failed to fetch categories: $e');
+    }
+  }
+
+  @override
+  Future<CategoryModel> getCategoryById(String id) async {
+    try {
+      final response = await client.get(ApiConstants.categoryById(id));
+
+      // API returns: { success: true, data: {...category...} }
+      if (response.data['success'] == true) {
+        return CategoryModel.fromJson(response.data['data']);
+      } else {
+        throw ServerException(response.data['message'] ?? 'Category not found');
+      }
+    } catch (e) {
+      if (e is ServerException) rethrow;
+      throw ServerException('Failed to fetch category: $e');
+    }
+  }
+}