// Setup API Key
GMSServices.provideAPIKey("Your-API-Key")

// Setup GMSMapview from Interface Builder
@IBOutlet weak var mapView: GMSMapView!

// Setup GMSMapview
let mapView = GMSMapView(frame: self.view.bounds)
self.view.addSubview(mapView)

// Camera position

mapView.rx.didChangePosition.asDriver()
    .drive(onNext: { print("Did change camera position: \($0)") })
    .addDisposableTo(disposeBag)

// Marker tapped

mapView.rx.didTapMarker.asDriver()
    .drive(onNext: { print("Did tap marker: \($0)") })
    .addDisposableTo(disposeBag)

// Update marker icon without storing selection status

let s0 = mapView.rx.selectedMarker.asObservable()
let s1 = s0.skip(1)

Observable.zip(s0, s1) { $0 }
    .subscribe(onNext: { (prev, cur) in
        if let marker = prev { marker.icon = #imageLiteral(resourceName: "marker_normal") }
        if let marker = cur { marker.icon = #imageLiteral(resourceName: "marker_selected") }
    })
    .addDisposableTo(disposeBag)
                

// Properties

button.rx.tap
    .map { false }
    .bindTo(mapView.rx.trafficEnabled.asObserver())
    .addDisposableTo(disposeBag)

// Camera animations

button.rx.tap
    .map { 14 }
    .bindTo(mapView.rx.zoomToAnimate)
    .addDisposableTo(disposeBag)
            
button.rx.tap
    .map { GMSCameraPosition.camera(withLatitude: latitude, longitude: longitude, zoom: 8, bearing: 10, viewingAngle: 30) }
    .bindTo(mapView.rx.cameraToAnimate)
    .addDisposableTo(disposeBag)
    
// Selected marker

button.rx.tap
    .map { myMarker }
    .bindTo(mapView.rx.selectedMarker.asObserver())
    .addDisposableTo(disposeBag)
    
// GMSMarker or GMSOverlay properties

button.rx.tap
    .map{ 180.0 }
    .bindTo(marker.rx.rotation.asObserver())
    .addDisposableTo(disposeBag)

button.rx.tap
    .map{ UIColor.red }
    .bindTo(circle.rx.fillColor.asObserver())
    .addDisposableTo(disposeBag)
    

// func mapView(_ mapView: GMSMapView, didTap marker: GMSMarker) -> Bool

mapView.rx.handleTapMarker { false }

// func mapView(_ mapView: GMSMapView, markerInfoWindow marker: GMSMarker) -> UIView?

mapView.rx.handleMarkerInfoWindow { marker in
    let label = UILabel(frame: CGRect(x: 0, y: 0, width: 180, height: 60))
    label.textAlignment = .center
    label.textColor = UIColor.brown
    label.font = UIFont.boldSystemFont(ofSize: 16)
    label.backgroundColor = UIColor.yellow
    label.text = marker.title
    return label
}