first commit

lib/api/category_api.dart

@@ -0,0 +1,34 @@
+import 'package:dio/dio.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../core/network/api_exception.dart';
+import '../core/network/dio_client.dart';
+import '../models/category.dart';
+
+final categoryApiProvider = Provider<CategoryApi>((ref) => CategoryApi(ref.watch(dioProvider)));
+
+class CategoryApi {
+  final Dio _dio;
+
+  CategoryApi(this._dio);
+
+  /// 获取分类列表，type: 1=支出 2=收入（后端可能返回裸数组或 {code,data}）
+  Future<List<Category>> getCategories(int type) async {
+    try {
+      final res = await _dio.get('/categories', queryParameters: {'type': type});
+      return _parseList(res.data)
+          .whereType<Map<String, dynamic>>()
+          .map(Category.fromJson)
+          .toList();
+    } on DioException catch (e) {
+      final err = e.error;
+      throw err is ApiException ? err : ApiException(-1, '请求失败');
+    }
+  }
+
+  List<dynamic> _parseList(Object? data) {
+    if (data is List) return data;
+    if (data is Map && data['data'] is List) return data['data'] as List;
+    throw ApiException(-1, '分类响应格式异常');
+  }
+}