// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// ignore_for_file: public_member_api_docs

import 'dart:async';
import 'dart:io';

import 'package:connectivity/connectivity.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

// Sets a platform override for desktop to avoid exceptions. See
// https://flutter.dev/desktop#target-platform-override for more info.
void _enablePlatformOverrideForDesktop() {
  if (!kIsWeb && (Platform.isWindows || Platform.isLinux)) {
    debugDefaultTargetPlatformOverride = TargetPlatform.fuchsia;
  }
}

void main() {
  _enablePlatformOverrideForDesktop();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  String _connectionStatus = 'Unknown';
  final Connectivity _connectivity = Connectivity();
  StreamSubscription<ConnectivityResult> _connectivitySubscription;

  @override
  void initState() {
    super.initState();
    initConnectivity();
    _connectivitySubscription =
        _connectivity.onConnectivityChanged.listen(_updateConnectionStatus);
  }

  @override
  void dispose() {
    _connectivitySubscription.cancel();
    super.dispose();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initConnectivity() async {
    ConnectivityResult result;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      result = await _connectivity.checkConnectivity();
    } on PlatformException catch (e) {
      print(e.toString());
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) {
      return Future.value(null);
    }

    return _updateConnectionStatus(result);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Connectivity example app'),
      ),
      body: Center(child: Text('Connection Status: $_connectionStatus')),
    );
  }

  Future<void> _updateConnectionStatus(ConnectivityResult result) async {
    switch (result) {
      case ConnectivityResult.wifi:
        String wifiName, wifiBSSID, wifiIP;

        try {
          if (!kIsWeb && Platform.isIOS) {
            LocationAuthorizationStatus status =
                await _connectivity.getLocationServiceAuthorization();
            if (status == LocationAuthorizationStatus.notDetermined) {
              status =
                  await _connectivity.requestLocationServiceAuthorization();
            }
            if (status == LocationAuthorizationStatus.authorizedAlways ||
                status == LocationAuthorizationStatus.authorizedWhenInUse) {
              wifiName = await _connectivity.getWifiName();
            } else {
              wifiName = await _connectivity.getWifiName();
            }
          } else {
            wifiName = await _connectivity.getWifiName();
          }
        } on PlatformException catch (e) {
          print(e.toString());
          wifiName = "Failed to get Wifi Name";
        }

        try {
          if (!kIsWeb && Platform.isIOS) {
            LocationAuthorizationStatus status =
                await _connectivity.getLocationServiceAuthorization();
            if (status == LocationAuthorizationStatus.notDetermined) {
              status =
                  await _connectivity.requestLocationServiceAuthorization();
            }
            if (status == LocationAuthorizationStatus.authorizedAlways ||
                status == LocationAuthorizationStatus.authorizedWhenInUse) {
              wifiBSSID = await _connectivity.getWifiBSSID();
            } else {
              wifiBSSID = await _connectivity.getWifiBSSID();
            }
          } else {
            wifiBSSID = await _connectivity.getWifiBSSID();
          }
        } on PlatformException catch (e) {
          print(e.toString());
          wifiBSSID = "Failed to get Wifi BSSID";
        }

        try {
          wifiIP = await _connectivity.getWifiIP();
        } on PlatformException catch (e) {
          print(e.toString());
          wifiIP = "Failed to get Wifi IP";
        }

        setState(() {
          _connectionStatus = '$result\n'
              'Wifi Name: $wifiName\n'
              'Wifi BSSID: $wifiBSSID\n'
              'Wifi IP: $wifiIP\n';
        });
        break;
      case ConnectivityResult.mobile:
      case ConnectivityResult.none:
        setState(() => _connectionStatus = result.toString());
        break;
      default:
        setState(() => _connectionStatus = 'Failed to get connectivity.');
        break;
    }
  }
}