meili-epfl/Meili

package com.github.epfl.meili.util

import android.Manifest
import android.annotation.SuppressLint
import android.app.Activity
import android.app.AlertDialog
import android.content.Context
import android.content.Intent
import android.content.pm.PackageManager
import android.location.LocationListener
import android.location.LocationManager
import android.provider.Settings
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.github.epfl.meili.BuildConfig

object LocationService {
    private const val REQUEST_CODE = 10100
    var getLocationManager: (Context?) -> LocationManager = { context ->
        context!!.getSystemService(Context.LOCATION_SERVICE) as LocationManager
    }

    fun isLocationPermissionGranted(activity: Activity): Boolean {
        return ContextCompat.checkSelfPermission(
                activity.applicationContext,
                Manifest.permission.ACCESS_FINE_LOCATION
        ) == PackageManager.PERMISSION_GRANTED
    }

    fun requestLocationPermission(activity: Activity) {
        if (BuildConfig.DEBUG && isLocationPermissionGranted(activity)) {
            error("Assertion failed")
        }

        ActivityCompat.requestPermissions(activity, arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), REQUEST_CODE)
    }

    @SuppressLint("MissingPermission")
    fun listenToLocationChanges(context: Context?, locationListener: LocationListener) {
        getLocationManager(context).requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0L, 0F, locationListener)
    }

    fun isLocationEnabled(context: Context?): Boolean {
        val lm = getLocationManager(context)
        return lm.isProviderEnabled(LocationManager.GPS_PROVIDER) &&
                lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)
    }

    fun requestLocation(context: Context, positiveListener: () -> Unit, negativeListener: () -> Unit) {
        if (BuildConfig.DEBUG && isLocationEnabled(context)) {
            error("Assertion failed")
        }
        AlertDialog.Builder(context)
                .setMessage("Location Disabled")
                .setPositiveButton("Turn on location") { _, _ ->
                    context.startActivity(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS))
                    positiveListener()
                }
                .setNegativeButton(android.R.string.cancel) { _, _ -> negativeListener() }
                .show()
    }
}