import Mapbox
import MapboxDirections
import MapboxCoreNavigation
import MapboxNavigation

class ViewController: UIViewController {
    var navigationView: NavigationMapView?
    
    // Keep `RouteController` in memory (class scope),
    // otherwise location updates won't be triggered
    public var mapboxRouteController: RouteController?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let navigationView = NavigationMapView(
            frame: .zero,
            // Tile loading can take a while
            styleURL: URL(string: "your style URL here"),
            config: MNConfig())
        self.navigationView = navigationView
        view.addSubview(navigationView)
        navigationView.translatesAutoresizingMaskIntoConstraints = false
        navigationView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        navigationView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        navigationView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        navigationView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        
        let waypoints = [
            CLLocation(latitude: 52.032407, longitude: 5.580310),
            CLLocation(latitude: 51.768686, longitude: 4.6827956)
        ].map { Waypoint(location: $0) }
        
        let options = NavigationRouteOptions(waypoints: waypoints, profileIdentifier: .automobileAvoidingTraffic)
        options.shapeFormat = .polyline6
        options.distanceMeasurementSystem = .metric
        options.attributeOptions = []
        
        print("[\(type(of:self))] Calculating routes with URL: \(Directions.shared.url(forCalculating: options))")
        
        /// URL is based on the base URL in the Info.plist called `MGLMapboxAPIBaseURL`
        /// - Note: Your routing provider could be strict about the user-agent of this app before allowing the call to work
        Directions.shared.calculate(options) { (waypoints, routes, error) in
            guard let route = routes?.first else { return }
            
            let simulatedLocationManager = SimulatedLocationManager(route: route)
            simulatedLocationManager.speedMultiplier = 20
            
            let mapboxRouteController = RouteController(
                along: route,
                directions: Directions.shared,
                locationManager: simulatedLocationManager)
            self.mapboxRouteController = mapboxRouteController
            mapboxRouteController.delegate = self
            mapboxRouteController.resume()
            
            NotificationCenter.default.addObserver(self, selector: #selector(self.didPassVisualInstructionPoint(notification:)), name: .routeControllerDidPassVisualInstructionPoint, object: nil)
            NotificationCenter.default.addObserver(self, selector: #selector(self.didPassSpokenInstructionPoint(notification:)), name: .routeControllerDidPassSpokenInstructionPoint, object: nil)
            
            navigationView.showRoutes([route], legIndex: 0)
        }
    }
}

// MARK: - RouteControllerDelegate

extension ViewController: RouteControllerDelegate {
    @objc public func routeController(_ routeController: RouteController, didUpdate locations: [CLLocation]) {
        let camera = MGLMapCamera(
            lookingAtCenter: locations.first!.coordinate,
            acrossDistance: 500,
            pitch: 0,
            heading: 0
        )
        
        navigationView?.setCamera(camera, animated: true)
    }
    
    @objc func didPassVisualInstructionPoint(notification: NSNotification) {
        guard let currentVisualInstruction = currentStepProgress(from: notification)?.currentVisualInstruction else { return }
        
        print(String(
            format: "didPassVisualInstructionPoint primary text: %@ and secondary text: %@",
            String(describing: currentVisualInstruction.primaryInstruction.text),
            String(describing: currentVisualInstruction.secondaryInstruction?.text)))
    }
    
    @objc func didPassSpokenInstructionPoint(notification: NSNotification) {
        guard let currentSpokenInstruction = currentStepProgress(from: notification)?.currentSpokenInstruction else { return }
        
        print("didPassSpokenInstructionPoint text: \(currentSpokenInstruction.text)")
    }
    
    private func currentStepProgress(from notification: NSNotification) -> RouteStepProgress? {
        let routeProgress = notification.userInfo?[RouteControllerNotificationUserInfoKey.routeProgressKey] as? RouteProgress
        return routeProgress?.currentLegProgress.currentStepProgress
    }
}