import 'package:dio/dio.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';

// Callback set by AuthNotifier so the API client can trigger logout on 401
void Function()? onUnauthorized;

const String _kBaseUrl = String.fromEnvironment(
  'BASE_URL',
  defaultValue: 'https://jarvis.goteku.com/api/v1',
);

class ApiClient {
  static ApiClient? _instance;
  late final Dio dio;
  final FlutterSecureStorage _storage = const FlutterSecureStorage();

  ApiClient._() {
    dio = Dio(BaseOptions(
      baseUrl: _kBaseUrl,
      connectTimeout: const Duration(seconds: 30),
      receiveTimeout: const Duration(seconds: 300), // Gemini needs 300s
      headers: {'Content-Type': 'application/json'},
    ));

    dio.interceptors.add(InterceptorsWrapper(
      onRequest: (options, handler) async {
        final token = await _storage.read(key: 'jwt_token');
        if (token != null) {
          options.headers['Authorization'] = 'Bearer $token';
        }
        handler.next(options);
      },
      onError: (error, handler) {
        if (error.response?.statusCode == 401) {
          _storage.deleteAll();
          onUnauthorized?.call();
        }
        handler.next(error);
      },
    ));
  }

  static ApiClient get instance => _instance ??= ApiClient._();
  Dio get client => dio;
}

// Convenience getter
Dio get apiDio => ApiClient.instance.client;

class ApiException implements Exception {
  final int statusCode;
  final String message;
  ApiException(this.statusCode, this.message);

  @override
  String toString() => message;

  static ApiException fromDioError(DioException e) {
    final data = e.response?.data;
    String msg = 'Terjadi kesalahan. Coba lagi.';
    if (data is Map && data['detail'] != null) {
      final detail = data['detail'];
      if (detail is String) msg = detail;
      else if (detail is List && detail.isNotEmpty) {
        msg = detail.map((d) => d['msg'] ?? '').join(', ');
      }
    }
    return ApiException(e.response?.statusCode ?? 0, msg);
  }
}