import android.Manifest
import android.annotation.SuppressLint
import android.content.pm.PackageManager
import android.os.Bundle
import android.os.Looper
import android.view.View
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.google.android.gms.location.*

/*

В манифест добавить разрешеня на геолокацию

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
*/
class MainActivity : AppCompatActivity() {
    private lateinit var fusedLocationClient: FusedLocationProviderClient
    private lateinit var mLocationRequest: LocationRequest

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
        checkPermission()
    }

    private fun checkPermission(){
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
            ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
        {
            // нет разрешений
            val permissions = arrayOf(
                Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION
            )
            ActivityCompat.requestPermissions(this, permissions, 0)
        } else {
            mLocationRequest = LocationRequest()
            mLocationRequest.interval = 10000
            mLocationRequest.fastestInterval = 1000
            mLocationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY

            fusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper())
        }
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>,
                                            grantResults: IntArray) {
        when (requestCode) {
            1 -> {
                if (!grantResults.isEmpty() && grantResults[0] ==
                    PackageManager.PERMISSION_GRANTED) 
                {
                    if ((ContextCompat.checkSelfPermission(this@MainActivity, Manifest.permission.ACCESS_FINE_LOCATION) === PackageManager.PERMISSION_GRANTED))
                    {
                        // получили разрешение - снова запускаем запрос разрешений, чтобы попасть в цикл опроса геолокации
                        checkPermission()
                    }
                } else {
                    Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show()
                }
                return
            }
        }
    }

    private var mLocationCallback: LocationCallback = object : LocationCallback() {
        override fun onLocationResult(locationResult: LocationResult) {
            if (!locationResult.locations.isEmpty()) {
                val locIndex = locationResult.locations.size - 1
                val lon = locationResult.locations[locIndex].longitude
                val lat = locationResult.locations[locIndex].latitude

                onGetCoordinates(lat, lon)
            }
        }
    }

    fun onGetCoordinates(lat: Double, lon: Double){
        // завершаем цикл опроса
        fusedLocationClient.removeLocationUpdates(mLocationCallback)

        // тут делаем что хотели с координатами
        Toast.makeText(this, "${lat}, ${lon}", Toast.LENGTH_LONG).show()
    }
}