import 'dart:async';
import 'package:dio/dio.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../core/config/app_config.dart';

final connectivityProvider =
    StateNotifierProvider<ConnectivityNotifier, bool>((ref) {
  return ConnectivityNotifier();
});

class ConnectivityNotifier extends StateNotifier<bool> {
  ConnectivityNotifier() : super(true) {
    _check(); // immediate first check
    _timer = Timer.periodic(const Duration(seconds: 30), (_) => _check());
  }

  Timer? _timer;

  // Dedicated lightweight Dio — short timeouts, no interceptors
  final _dio = Dio(BaseOptions(
    connectTimeout: const Duration(seconds: 3),
    receiveTimeout: const Duration(seconds: 3),
  ));

  /// 立即触发一次检测（供外部调用，如 API 请求失败时）
  Future<void> forceCheck() => _check();

  Future<void> _check() async {
    try {
      await _dio.get(AppConfig.healthUrl);
      if (!state) state = true;
    } catch (_) {
      if (state) state = false;
    }
  }

  @override
  void dispose() {
    _timer?.cancel();
    _dio.close(force: true);
    super.dispose();
  }
}