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

class ApiClient {
  late final Dio dio;
  final FlutterSecureStorage _storage = const FlutterSecureStorage();
  VoidCallback? onForceLogout;

  ApiClient() {
    dio = Dio(BaseOptions(
      connectTimeout: const Duration(seconds: 15),
      receiveTimeout: const Duration(seconds: 30),
    ));

    dio.interceptors.add(InterceptorsWrapper(
      onRequest: (options, handler) async {
        final token = await _storage.read(key: 'access_token');
        if (token != null) {
          options.headers['Authorization'] = 'Bearer $token';
        }
        handler.next(options);
      },
      onError: (error, handler) async {
        if (error.response?.statusCode == 401) {
          final refreshed = await _tryRefreshToken();
          if (refreshed) {
            final opts = error.requestOptions;
            final token = await _storage.read(key: 'access_token');
            opts.headers['Authorization'] = 'Bearer $token';
            try {
              final response = await dio.fetch(opts);
              return handler.resolve(response);
            } catch (e) {
              return handler.next(error);
            }
          } else {
            onForceLogout?.call();
          }
        }
        handler.next(error);
      },
    ));
  }

  Future<void> setBaseUrl(String serverUrl) async {
    final url = serverUrl.endsWith('/')
        ? serverUrl.substring(0, serverUrl.length - 1)
        : serverUrl;
    dio.options.baseUrl = '$url/wp-json/twilio-mobile/v1';
    await _storage.write(key: 'server_url', value: url);
  }

  Future<void> restoreBaseUrl() async {
    final url = await _storage.read(key: 'server_url');
    if (url != null) {
      dio.options.baseUrl = '$url/wp-json/twilio-mobile/v1';
    }
  }

  Future<bool> _tryRefreshToken() async {
    try {
      final refreshToken = await _storage.read(key: 'refresh_token');
      if (refreshToken == null) return false;

      final response = await dio.post(
        '/auth/refresh',
        data: {'refresh_token': refreshToken},
        options: Options(headers: {'Authorization': ''}),
      );

      if (response.statusCode == 200 && response.data['success'] == true) {
        await _storage.write(
            key: 'access_token', value: response.data['access_token']);
        if (response.data['refresh_token'] != null) {
          await _storage.write(
              key: 'refresh_token', value: response.data['refresh_token']);
        }
        return true;
      }
    } catch (_) {}
    return false;
  }
}

typedef VoidCallback = void Function();