import 'dart:async';
import 'dart:html';
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:amap_flutter_location/amap_flutter_location.dart';
import 'package:amap_flutter_location/amap_location_option.dart';
import 'package:flutter/scheduler.dart';
import 'package:permission_handler/permission_handler.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  Map<String, Object?>? _locationResult;

  StreamSubscription<Map<String, Object?>>? _locationListener;

  AMapFlutterLocation _locationPlugin = new AMapFlutterLocation();

  @override
  void initState() {
    super.initState();

    /// 设置是否已经包含高德隐私政策并弹窗展示显示用户查看，如果未包含或者没有弹窗展示，高德定位SDK将不会工作
    ///
    /// 高德SDK合规使用方案请参考官网地址：https://lbs.amap.com/news/sdkhgsy
    /// <b>必须保证在调用定位功能之前调用， 建议首次启动App时弹出《隐私政策》并取得用户同意</b>
    ///
    /// 高德SDK合规使用方案请参考官网地址：https://lbs.amap.com/news/sdkhgsy
    ///
    /// [hasContains] 隐私声明中是否包含高德隐私政策说明
    ///
    /// [hasShow] 隐私权政策是否弹窗展示告知用户
    AMapFlutterLocation.updatePrivacyShow(true, true);

    /// 设置是否已经取得用户同意，如果未取得用户同意，高德定位SDK将不会工作
    ///
    /// 高德SDK合规使用方案请参考官网地址：https://lbs.amap.com/news/sdkhgsy
    ///
    /// <b>必须保证在调用定位功能之前调用, 建议首次启动App时弹出《隐私政策》并取得用户同意</b>
    ///
    /// [hasAgree] 隐私权政策是否已经取得用户同意
    AMapFlutterLocation.updatePrivacyAgree(true);

    /// 动态申请定位权限
    // requestPermission();

    ///设置Android和iOS的apiKey<br>
    ///key的申请请参考高德开放平台官网说明<br>
    ///Android: https://lbs.amap.com/api/android-location-sdk/guide/create-project/get-key
    ///iOS: https://lbs.amap.com/api/ios-location-sdk/guide/create-project/get-key
    /// ios key使用的是承运司机iOS
    SchedulerBinding.instance.addPostFrameCallback((_) {
      AMapFlutterLocation.setApiKey(
          "1dbf56e2e8a4d0e4cdc2df9efd36bc71",
          "125a8a531a3a740654c9e75bbefa7beb",
          "f759e608583c169bb23d7817ed05583d");
    });

    ///iOS 获取native精度类型
    // if (Platform.isIOS) {
    //   requestAccuracyAuthorization();
    // }

    ///注册定位结果监听
    _locationListener = _locationPlugin
        .onLocationChanged()
        .listen((Map<String, Object?> result) {
      setState(() {
        _locationResult = result;
      });
    });
  }

  @override
  void dispose() {
    super.dispose();

    ///移除定位监听
    if (null != _locationListener) {
      _locationListener?.cancel();
    }

    ///销毁定位
    _locationPlugin.destroy();
  }

  ///设置定位参数
  void _setLocationOption() {
    AMapLocationOption locationOption = new AMapLocationOption();

    ///是否单次定位
    locationOption.onceLocation = false;

    ///是否需要返回逆地理信息
    locationOption.needAddress = true;

    ///逆地理信息的语言类型
    locationOption.geoLanguage = GeoLanguage.DEFAULT;

    locationOption.desiredLocationAccuracyAuthorizationMode =
        AMapLocationAccuracyAuthorizationMode.ReduceAccuracy;

    locationOption.fullAccuracyPurposeKey = "AMapLocationScene";

    ///设置Android端连续定位的定位间隔
    locationOption.locationInterval = 2000;

    ///设置Android端的定位模式<br>
    ///可选值：<br>
    ///<li>[AMapLocationMode.Battery_Saving]</li>
    ///<li>[AMapLocationMode.Device_Sensors]</li>
    ///<li>[AMapLocationMode.Hight_Accuracy]</li>
    locationOption.locationMode = AMapLocationMode.Hight_Accuracy;

    ///设置iOS端的定位最小更新距离<br>
    locationOption.distanceFilter = -1;

    ///设置iOS端期望的定位精度
    /// 可选值：<br>
    /// <li>[DesiredAccuracy.Best] 最高精度</li>
    /// <li>[DesiredAccuracy.BestForNavigation] 适用于导航场景的高精度 </li>
    /// <li>[DesiredAccuracy.NearestTenMeters] 10米 </li>
    /// <li>[DesiredAccuracy.Kilometer] 1000米</li>
    /// <li>[DesiredAccuracy.ThreeKilometers] 3000米</li>
    locationOption.desiredAccuracy = DesiredAccuracy.Best;

    ///设置iOS端是否允许系统暂停定位
    locationOption.pausesLocationUpdatesAutomatically = false;

    ///将定位参数设置给定位插件
    _locationPlugin.setLocationOption(locationOption);
  }

  ///开始定位
  void _startLocation() {
    ///开始定位之前设置定位参数
    _setLocationOption();
    _locationPlugin.startLocation();
  }

  ///停止定位
  void _stopLocation() {
    _locationPlugin.stopLocation();
  }

  Container _createButtonContainer() {
    return new Container(
        alignment: Alignment.center,
        child: new Row(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            new ElevatedButton(
              onPressed: _startLocation,
              child: new Text('开始定位'),
              style: ButtonStyle(
                backgroundColor: MaterialStateProperty.all(Colors.blue),
                foregroundColor: MaterialStateProperty.all(Colors.white),
              ),
            ),
            new Container(width: 20.0),
            new ElevatedButton(
              onPressed: _stopLocation,
              child: new Text('停止定位'),
              style: ButtonStyle(
                backgroundColor: MaterialStateProperty.all(Colors.blue),
                foregroundColor: MaterialStateProperty.all(Colors.white),
              ),
            )
          ],
        ));
  }

  Widget _resultWidget(key, value) {
    return new Container(
      child: new Row(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: <Widget>[
          new Container(
            alignment: Alignment.centerRight,
            width: 100.0,
            child: new Text('$key :'),
          ),
          new Container(width: 5.0),
          new Flexible(child: new Text('$value', softWrap: true)),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    List<Widget> widgets = <Widget>[];
    widgets.add(_createButtonContainer());

    if (_locationResult != null) {
      _locationResult?.forEach((key, value) {
        widgets.add(_resultWidget(key, value));
      });
    }

    return new MaterialApp(
        home: new Scaffold(
      appBar: new AppBar(
        title: new Text('AMap Location plugin example app'),
      ),
      body: new Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisSize: MainAxisSize.min,
        children: widgets,
      ),
    ));
  }

  ///获取iOS native的accuracyAuthorization类型
  void requestAccuracyAuthorization() async {
    AMapAccuracyAuthorization currentAccuracyAuthorization =
        await _locationPlugin.getSystemAccuracyAuthorization();
    if (currentAccuracyAuthorization ==
        AMapAccuracyAuthorization.AMapAccuracyAuthorizationFullAccuracy) {
      print("精确定位类型");
    } else if (currentAccuracyAuthorization ==
        AMapAccuracyAuthorization.AMapAccuracyAuthorizationReducedAccuracy) {
      print("模糊定位类型");
    } else {
      print("未知定位类型");
    }
  }

  /// 动态申请定位权限
  void requestPermission() async {
    // 申请权限
    bool hasLocationPermission = await requestLocationPermission();
    if (hasLocationPermission) {
      print("定位权限申请通过");
    } else {
      print("定位权限申请不通过");
    }
  }

  /// 申请定位权限
  /// 授予定位权限返回true， 否则返回false
  Future<bool> requestLocationPermission() async {
    //获取当前的权限
    var status = await Permission.location.status;
    if (status == PermissionStatus.granted) {
      //已经授权
      return true;
    } else {
      //未授权则发起一次申请
      status = await Permission.location.request();
      if (status == PermissionStatus.granted) {
        return true;
      } else {
        return false;
      }
    }
  }
}