import 'package:dio/dio.dart';
import 'package:real_estate_mobile/config/app_config.dart';
import 'package:real_estate_mobile/core/network/api_exceptions.dart';
import 'package:real_estate_mobile/core/storage/secure_storage.dart';

class ApiClient {
  static ApiClient? _instance;
  late final Dio _dio;

  ApiClient._() {
    _dio = Dio(
      BaseOptions(
        baseUrl: AppConfig.apiBaseUrl,
        connectTimeout: const Duration(seconds: 30),
        receiveTimeout: const Duration(seconds: 30),
        headers: {
          'Content-Type': 'application/json',
          'Accept': 'application/json',
        },
      ),
    );

    _dio.interceptors.addAll([
      _authInterceptor(),
      _errorInterceptor(),
    ]);
  }

  static ApiClient get instance {
    _instance ??= ApiClient._();
    return _instance!;
  }

  Dio get dio => _dio;

  InterceptorsWrapper _authInterceptor() {
    return InterceptorsWrapper(
      onRequest: (options, handler) async {
        final token = await SecureStorage.getAccessToken();
        if (token != null) {
          options.headers['Authorization'] = 'Bearer $token';
        }
        handler.next(options);
      },
    );
  }

  InterceptorsWrapper _errorInterceptor() {
    return InterceptorsWrapper(
      onError: (error, handler) {
        final response = error.response;
        if (response != null) {
          final data = response.data;
          if (data is Map<String, dynamic>) {
            final message = data['message'] is List
                ? (data['message'] as List).join(', ')
                : data['message']?.toString() ?? 'An error occurred';

            final errors = (data['errors'] as List<dynamic>?)
                    ?.map((e) => FieldError.fromJson(e as Map<String, dynamic>))
                    .toList() ??
                [];

            handler.reject(
              DioException(
                requestOptions: error.requestOptions,
                response: error.response,
                error: ApiException(
                  message: message,
                  statusCode: response.statusCode,
                  fieldErrors: errors,
                ),
              ),
            );
            return;
          }
        }

        handler.reject(
          DioException(
            requestOptions: error.requestOptions,
            response: error.response,
            error: ApiException(
              message: error.message ?? 'Network error occurred',
              statusCode: response?.statusCode,
            ),
          ),
        );
      },
    );
  }
}