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/auth_response.dart';

final authApiProvider = Provider<AuthApi>((ref) => AuthApi(ref.watch(dioProvider)));

class AuthApi {
  final Dio _dio;

  AuthApi(this._dio);

  /// 登录 → {token, username, nickname}
  Future<AuthResponse> login(String username, String password) async {
    try {
      final res = await _dio.post('/auth/login', data: {
        'username': username,
        'password': password,
      });
      return AuthResponse.fromJson(_map(res.data));
    } on DioException catch (e) {
      throw _unwrap(e);
    }
  }

  /// 注册 → {token, username, nickname}
  Future<AuthResponse> register(String username, String password, String nickname) async {
    try {
      final res = await _dio.post('/auth/register', data: {
        'username': username,
        'password': password,
        'nickname': nickname,
      });
      return AuthResponse.fromJson(_map(res.data));
    } on DioException catch (e) {
      throw _unwrap(e);
    }
  }

  Map<String, dynamic> _map(Object? data) {
    if (data is Map<String, dynamic>) return data;
    throw ApiException(-1, '响应格式异常');
  }

  Never _unwrap(DioException e) {
    final err = e.error;
    if (err is ApiException) throw err;
    throw ApiException(-1, '请求失败');
  }
}