import 'dart:typed_data';
import 'package:dio/dio.dart';
import '../../core/constants/api_endpoints.dart';
import '../../core/network/api_response.dart';
import '../../core/network/dio_client.dart';
import '../models/user.dart';

/// 用戶服務
class UserService {
  final DioClient _client;

  UserService(this._client);

  /// 用戶登錄
  Future<ApiResponse<Map<String, dynamic>>> login(
    String username,
    String password,
  ) async {
    return _client.post<Map<String, dynamic>>(
      ApiEndpoints.login,
      data: {'username': username, 'password': password},
    );
  }

  /// 用戶註冊（multipart：含身份證圖片和可選推廣碼）
  Future<ApiResponse<Map<String, dynamic>>> register(
    String username,
    String password, {
    String? referralCode,
    required Uint8List frontBytes,
    required Uint8List backBytes,
  }) async {
    final formData = FormData.fromMap({
      'username': username,
      'password': password,
      if (referralCode != null && referralCode.isNotEmpty) 'referralCode': referralCode,
      'front': MultipartFile.fromBytes(frontBytes, filename: 'front.jpg'),
      'back': MultipartFile.fromBytes(backBytes, filename: 'back.jpg'),
    });
    return _client.upload<Map<String, dynamic>>(
      ApiEndpoints.register,
      formData: formData,
    );
  }

  /// 獲取用戶信息
  Future<ApiResponse<User>> getUserInfo() async {
    return _client.get<User>(
      ApiEndpoints.userInfo,
      fromJson: (data) => User.fromJson(data as Map<String, dynamic>),
    );
  }

  /// 上傳 KYC 資料（身份證正反面圖片字節）
  /// 使用 fromBytes 以兼容 Web 和移動端
  Future<ApiResponse<void>> uploadKyc(
    Uint8List frontBytes,
    Uint8List backBytes,
  ) async {
    final formData = FormData.fromMap({
      'front': MultipartFile.fromBytes(frontBytes, filename: 'front.jpg'),
      'back': MultipartFile.fromBytes(backBytes, filename: 'back.jpg'),
    });
    return _client.upload<void>(
      ApiEndpoints.kyc,
      formData: formData,
    );
  }

  /// 退出登錄
  Future<ApiResponse<void>> logout() async {
    return _client.post<void>(ApiEndpoints.logout);
  }
}