import 'package:flutter/services.dart';

typedef OnNetWorkChanged = void Function(ConnectivityResult);

List<OnNetWorkChanged> _notifyList = [];

ConnectivityResult _getNetwork(String network) {
  if (network == "1") {
    return ConnectivityResult.mobile;
  } else if (network == "2") {
    return ConnectivityResult.wifi;
  } else {
    return ConnectivityResult.none;
  }
}

class Connectivity {
  static Connectivity? _singleton;

  static final NetWorkMethodChannel _netWorkMethodChannel =
      NetWorkMethodChannel("com.yeshi.video/network");

  Connectivity._();

  factory Connectivity() {
    _singleton ??= Connectivity._();
    return _singleton!;
  }

  Future<ConnectivityResult> checkConnectivity() async {
    String network =
        await _netWorkMethodChannel.invokeMethod("getCurrentNetwork");
    print("当前网络状态$network");
    return _getNetwork(network);
  }

  OnNetWorkChanged listen(OnNetWorkChanged changed) {
    _notifyList.add(changed);
    return changed;
  }

  remove(OnNetWorkChanged changed) {
    _notifyList.remove(changed);
  }
}

class NetWorkMethodChannel extends MethodChannel {
  NetWorkMethodChannel(String name) : super(name) {
    setMethodCallHandler((call) {
      switch (call.method) {
        case "onNetworkChanged":
          {
            print("网络连接状态改变${call.arguments}");
            String network = call.arguments;
            _notifyList.forEach((element) {
              element(_getNetwork(network));
            });
          }
      }
      return Future.value();
    });
  }
}

enum ConnectivityResult {
  /// WiFi: Device connected via Wi-Fi
  wifi,

  /// Mobile: Device connected to cellular network
  mobile,

  /// None: Device not connected to any network
  none
}