// 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

class PanoramaViewController: UIViewController {

  private let markerLocation = CLLocationCoordinate2D(latitude: 40.761455, longitude: -73.977814)
  private var panoramaView = GMSPanoramaView(frame: .zero)
  private var statusLabel = UILabel(frame: .zero)
  private var configured = false

  override func loadView() {
    navigationController?.navigationBar.isTranslucent = false
    panoramaView.moveNearCoordinate(.newYork)
    panoramaView.backgroundColor = .gray
    panoramaView.delegate = self
    view = panoramaView

    statusLabel.alpha = 0.0
    statusLabel.backgroundColor = .blue
    statusLabel.textColor = .white
    statusLabel.textAlignment = .center
    view.addSubview(statusLabel)
    statusLabel.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      statusLabel.topAnchor.constraint(equalTo: view.topAnchor),
      statusLabel.heightAnchor.constraint(equalToConstant: 30),
      statusLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor),
      statusLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor),
    ])
  }
}

extension PanoramaViewController: GMSPanoramaViewDelegate {
  func panoramaView(_ panoramaView: GMSPanoramaView, didMove camera: GMSPanoramaCamera) {
    print("Camera:\(camera.orientation.heading), \(camera.orientation.pitch), \(camera.zoom)")
  }

  func panoramaView(_ view: GMSPanoramaView, didMoveTo panorama: GMSPanorama?) {
    if configured { return }
    let marker = GMSMarker(position: markerLocation)
    marker.icon = GMSMarker.markerImage(with: .purple)
    marker.panoramaView = panoramaView
    let heading = GMSGeometryHeading(.newYork, markerLocation)
    panoramaView.camera = GMSPanoramaCamera(heading: heading, pitch: 0, zoom: 1)
    configured = true
  }

  func panoramaViewDidStartRendering(_ panoramaView: GMSPanoramaView) {
    statusLabel.alpha = 0.8
    statusLabel.text = "Rendering"
  }

  func panoramaViewDidFinishRendering(_ panoramaView: GMSPanoramaView) {
    statusLabel.alpha = 0
  }
}