ViewController.swift

//
//  ViewController.swift
//  Trailer
//
//  Created by Cody Lopez on 1/18/18.
//  Copyright © 2018 Cody Lopez. All rights reserved.
//

import UIKit
import Mapbox
import CoreLocation
import RxSwift


class ViewController: UIViewController, CLLocationManagerDelegate, MGLMapViewDelegate {
    let locationManager = CLLocationManager()
    let disposeBag = DisposeBag()

    let coordinates$: PublishSubject<Array<Double>> = PublishSubject<Array<Double>>()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        
        // Do something
        enableBasicLocationServices()
        
        let mapView = MGLMapView(frame: view.bounds, styleURL: MGLStyle.outdoorsStyleURL())
        mapView.delegate = self
        mapView.showsUserLocation = true
        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        
        let subscription = coordinates$.subscribe(onNext: { coordinates in
            mapView.setCenter(CLLocationCoordinate2D(latitude: coordinates[0], longitude: coordinates[1]), zoomLevel: 9, animated: false)
            self.view.addSubview(mapView)
            print("\(coordinates)")
        })
        subscription.disposed(by: disposeBag)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func enableBasicLocationServices() {
        locationManager.delegate = self
        
        switch CLLocationManager.authorizationStatus() {
        case .notDetermined:
            // Request when-in-use authorization initially
            locationManager.requestWhenInUseAuthorization()
            break
            
        case .restricted, .denied:
            // Disable location features
            disableMyLocationBasedFeatures()
            break
            
        case .authorizedWhenInUse, .authorizedAlways:
            // Enable location features
            enableMyWhenInUseFeatures()
            break
        }
    }
    
    func locationManager(_ manager: CLLocationManager,
                         didChangeAuthorization status: CLAuthorizationStatus) {
        switch status {
        case .restricted, .denied:
            disableMyLocationBasedFeatures()
            break
            
        case .authorizedWhenInUse:
            enableMyWhenInUseFeatures()
            break
            
        case .notDetermined, .authorizedAlways:
            break
        }
    }
    
    func disableMyLocationBasedFeatures(){
        print("disableMyLocationBasedFeatures")
    }
    
    func enableMyWhenInUseFeatures(){
        print("enableMyWhenInUseFeaatures")
        locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters
        locationManager.distanceFilter = 2.5  // In meters.
        locationManager.startUpdatingLocation()
    }
    
    func locationManager(_ manager: CLLocationManager,  didUpdateLocations locations: [CLLocation]) {
        let coordinates = locations.last!.coordinate
        
        coordinates$.onNext([coordinates.latitude, coordinates.longitude])
        
    }

}