import 'dart:async';
import 'package:flutter/services.dart';
import 'package:permission_handler/permission_handler.dart';
import 'messages.dart' as msg;

class Sensor {
  static final msg.SensorApi api = msg.SensorApi();
  static const  _eventChannelLocation = EventChannel("com.beswell.sensor.event/location");
  static const  _eventChannelOrientation = EventChannel("com.beswell.sensor.event/orientation");
  static const  _eventChannelHRM = EventChannel("com.beswell.sensor.event/HRM");
  /// 类型List<Map<String, dynamic>>，每个Map中包括
  ///   String address;
  ///   String name;
  ///   int  rssi;
  static const  _eventChannelSportWearScanResult = EventChannel("com.beswell.sensor.event/SportWearScanResult");
  /// 类型List<Map<String, dynamic>>，每个Map中包括
  ///   String address;
  ///   String name;
  ///   int  rssi;
  static const  _eventChannelSportWearConnected = EventChannel("com.beswell.sensor.event/SportWearConnected");

  static Stream<dynamic>? _locationStream;
  static Stream<Position> get locationStream {
    _locationStream ??= _eventChannelLocation.receiveBroadcastStream();

    return  _locationStream!.map((event) {
      final p0 = msg.Position.decode(event);

      return Position()
        ..longitude=p0.longitude??0
        ..latitude=p0.latitude??0
        ..altitude=p0.altitude??0
        ..speed=p0.speed??0
        ..accuracy=p0.accuracy??0
        ..bearing=p0.bearing??0
        ..tsMs=p0.timeMs??0
      ;
    } );
  }

  static Stream<dynamic>? _orientationStream;
  static Stream<Orientation> get orientationStream {
    _orientationStream??=_eventChannelOrientation.receiveBroadcastStream();

    return  _orientationStream!.map((event) {
      final r = msg.Orientation.decode(event);

      return Orientation()
          ..x = r.x ?? 0
          ..y = r.y ?? 0
          ..z = r.z ?? 0;
    } );
  }

  static Future<Position> getCurrentPosition({bool force = false}) async {
    final r = await api.getCurrentPosition(force);
    return Position()
      ..longitude = r.longitude ?? 0
      ..latitude = r.latitude ?? 0
      ..altitude = r.altitude ?? 0;
  }
  static Future<bool> isLocationServiceOpen()async {
    return api.isLocationServiceOpen();
  }

  static Stream<List<SportWear>> get sportWearScanResultStream {
    return _eventChannelSportWearScanResult.receiveBroadcastStream().map((event) {
      final l = event as List<dynamic>;
      return l.map((e){
        final m = e as Map<dynamic, dynamic>;

        return SportWear()
          ..name=m['name']
          ..address=m['address']
          ..rssi=m['rssi']
        ;
      }
      ).toList();
    } );
  }

  static Future<void> sportWearScanStart() async{
    var status = await Permission.bluetoothScan.status ;
    if (status.isDenied){
       if(await Permission.bluetoothScan.request().isDenied){
         throw Exception('无扫描权限');
       }
    }
    status = await Permission.bluetooth.status ;
    if (status.isDenied){
      if(await Permission.bluetooth.request().isDenied){
        throw Exception('无蓝牙权限');
      }
    }
    status = await Permission.bluetoothConnect.status ;
    if (status.isDenied){
      if(await Permission.bluetoothConnect.request().isDenied){
        throw Exception('无蓝牙权限');
      }
    }
    status = await Permission.location.status ;
    if (status.isDenied){
      if(await Permission.location.request().isDenied){
        throw Exception('无定位权限');
      }
    }
    if (await api.askEnableBluetooth()){
      api.sportWearScanStart();
    }else{
      throw Exception('未开启蓝牙');
    }
  }
  static Future<void> sportWearScanStop() async{
    await api.sportWearScanStop();
  }
  static Future<void> sportWearConnect(SportWear wear)async{
    await api.sportWearConnect(msg.SportWear()..address=wear.address);
  }
  static Future<void> sportWearDisconnect(SportWear wear)async{
    await api.sportWearDisconnect(msg.SportWear()..address=wear.address);
  }

  static Stream<List<SportWear>> get sportWearConnectedStream {
    return _eventChannelSportWearConnected.receiveBroadcastStream().map((event) {
      final l = event as List<dynamic>;
      return l.map((e){
        final m = e as Map<dynamic, dynamic>;

        return SportWear()
          ..name=m.containsKey('name')?m['name']:''
          ..address=m['address']
          ..rssi=m.containsKey('rssi')?m['rssi']:0
        ;
      }
      ).toList();
    });
  }

  static Stream<HeartRateMeasurement> get sportWearHeartRateMeasurementStream {
    return  _eventChannelHRM.receiveBroadcastStream().map((event) {
      try{
        final e = msg.HeartRateMeasurement.decode(event);

        return HeartRateMeasurement()
          ..sportWearAddress=e.deviceMac ??''
          ..heartRate=e.heartRate??0
          ..contactDetected=e.contactDetected??true
          ..rrIntervals=e.rrIntervals?.map((rr) => rr??0).toList()??List.empty()
          ..timestamp= DateTime.fromMillisecondsSinceEpoch(
              e.timestampMill?? DateTime.now().millisecondsSinceEpoch);
      }catch(e){
        print('心率接收错误：$e');
        return HeartRateMeasurement();
      }

    } );
  }
  static Future<void> locationStart(Duration minTime, double minDistanceM) async {
    var status = await Permission.location.status ;
    if (status.isDenied){
      if(await Permission.location.request().isDenied){
        throw Exception('无定位权限');
      }
    }
    await api.locationStart(minTime.inMilliseconds, minDistanceM);
  }
}

class Orientation {
  double x = 0;
  double y = 0;
  double z = 0;
}

class Position {
  double latitude = 0;
  double longitude = 0;
  double altitude = 0;
  double speed=0;
  double accuracy=0;
  double bearing=0;
  int tsMs=0;
}
class SportWear{
  String address='';
  String name='';
  int    rssi=0;
}

class HeartRateMeasurement{
  String sportWearAddress='';
  int heartRate=0;
  /// 是否已检测到传感器接触信息
  bool contactDetected=false;
  /// RR间隔的可选列表，每个间隔为1/1024秒
  List<int> rrIntervals=List.empty();
  DateTime   timestamp=DateTime.now();
}