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/account.dart';

final accountApiProvider = Provider<AccountApi>((ref) => AccountApi(ref.watch(dioProvider)));

/// 账户接口（后端每个用户只有一个默认账户）
class AccountApi {
  final Dio _dio;

  AccountApi(this._dio);

  /// 账户信息：余额、总收入、总支出（收支为全部账单汇总，只读）
  Future<AccountInfo> getAccount() async {
    try {
      final res = await _dio.get('/accounts');
      return AccountInfo.fromJson(_parseObject(res.data));
    } on DioException catch (e) {
      throw _unwrap(e);
    }
  }

  /// 更新余额。
  ///
  /// 注意：后端这个接口写入的是**期初余额**，传入前需用
  /// `initialBalanceFor()` 把目标余额换算成期初余额。
  Future<AccountInfo> updateBalance(double initialBalance) async {
    try {
      final res = await _dio.put('/accounts/balance', data: {
        'initialBalance': initialBalance,
      });
      return AccountInfo.fromJson(_parseObject(res.data));
    } on DioException catch (e) {
      throw _unwrap(e);
    }
  }

  Map<String, dynamic> _parseObject(Object? data) {
    if (data is Map<String, dynamic>) return data;
    if (data is Map && data['data'] is Map) {
      return Map<String, dynamic>.from(data['data'] as Map);
    }
    throw ApiException(-1, '账户响应格式异常');
  }

  Never _unwrap(DioException e) {
    final err = e.error;
    if (err is ApiException) throw err;
    throw ApiException(-1, '账户操作失败');
  }
}