LocationFix.swift

//
//  LocationManager.swift
//  NotesOnEarth
//
//  Created by Onur Geneş on 11.02.2020.
//  Copyright © 2020 Onur Geneş. All rights reserved.
//

import UIKit
import CoreLocation

final class LocationManager: NSObject, Locatable {
    weak var delegate: LocatableOutputProtocol?
    
    var locationManager: CLLocationManager
    
    override init() {
        locationManager = CLLocationManager()
        super.init()
        
        NotificationCenter.default.addObserver(self, selector: #selector(applicationDidEnterBackgroundActive(_:)), name: UIApplication.didEnterBackgroundNotification, object: nil)

        NotificationCenter.default.addObserver(self, selector: #selector(applicationWillEnterForegroundActive(_:)), name: UIApplication.willEnterForegroundNotification, object: nil)

        
        if CLLocationManager.locationServicesEnabled() {
            requestPermission()
            locationManager.delegate = self
        } else {
            // TODO: Show user warning
        }
    }
    
    func getCurrentLocation() {
        locationManager.startUpdatingLocation()
    }
    
    func startTrackSignificantChanges() {
        locationManager.startMonitoringSignificantLocationChanges()
    }
    
    func requestPermission() {
        locationManager.requestAlwaysAuthorization()
    }
    
    @objc private func applicationDidEnterBackgroundActive (_ notification: Notification) {
            self.locationManager.startMonitoringSignificantLocationChanges()
    }

    @objc private func applicationWillEnterForegroundActive (_ notification: Notification) {
        self.locationManager.startUpdatingLocation()
    }
}

extension LocationManager: CLLocationManagerDelegate {
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let coordinates = locations.first?.coordinate {
            self.delegate?.didGetCurrentLocation(latitude: coordinates.latitude, longitude: coordinates.longitude)
        }
    }
    
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        self.delegate?.failedGetCurrentLocation(error: error)
    }
    
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        print("status changed")
        if (status == .authorizedAlways || status == .authorizedWhenInUse) {
            print("we got permission")
            locationManager.startUpdatingLocation()
            locationManager.allowsBackgroundLocationUpdates = true
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.distanceFilter = 200
        } else {
            print("NO PERMISSION FOR LOCATION")
        }
    }
}