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');
  }
}