// Copyright 2020 Google LLC. All rights reserved.
//
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License. You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under
// the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
// ANY KIND, either express or implied. See the License for the specific language governing
// permissions and limitations under the License.

import GoogleMaps
import UIKit

final class GroundOverlayViewController: UIViewController {
  override func loadView() {
    let southWest = CLLocationCoordinate2D(latitude: 40.712216, longitude: -74.22655)
    let northEast = CLLocationCoordinate2D(latitude: 40.773941, longitude: -74.12544)
    let overlayBounds = GMSCoordinateBounds(coordinate: southWest, coordinate: northEast)

    // Choose the midpoint of the coordinate to focus the camera on.
    let newark = GMSGeometryInterpolate(southWest, northEast, 0.5)
    let cameraPosition = GMSCameraPosition(target: newark, zoom: 12, bearing: 0, viewingAngle: 45)
    let mapView = GMSMapView(frame: .zero, camera: cameraPosition)
    mapView.delegate = self
    view = mapView

    // Add the ground overlay, centered in Newark, NJ
    let groundOverlay = GMSGroundOverlay()
    // Image from http://www.lib.utexas.edu/maps/historical/newark_nj_1922.jpg
    groundOverlay.icon = UIImage(named: "newark_nj_1922.jpg")
    groundOverlay.isTappable = true
    groundOverlay.position = newark
    groundOverlay.bounds = overlayBounds
    groundOverlay.map = mapView
  }
}

extension GroundOverlayViewController: GMSMapViewDelegate {
  func mapView(_ mapView: GMSMapView, didTap overlay: GMSOverlay) {
    guard let groundOverlay = overlay as? GMSGroundOverlay else { return }
    groundOverlay.opacity = Float.random(in: 0.5..<1)
  }
}