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import SwiftUI
import PlaygroundSupport

struct PhotoPickerDisplayer: View {

  @State var presentation: Bool = false
  @State var selectedImage: UIImage? = nil

  var body: some View {
    NavigationView{
      VStack{
        if selectedImage != nil {
          Image(uiImage: selectedImage!)
          .resizable()
            .aspectRatio(nil, contentMode: .fit)
        } else {
          Text("Tap the top photo button to select an image to display")
            .font(.footnote)
            .foregroundColor(Color.black.opacity(0.6))
        }

      }.navigationBarTitle("Photo Selection")
        .navigationBarItems(trailing: Button(action: {
          self.presentation = true
        }) {
          Image(systemName: "photo")
        }).sheet(isPresented: $presentation, content: {
          PhotoPickerModal(isPresented: self.$presentation,
                           selectedImage: self.$selectedImage)
        })
    }
  }
}

struct PhotoPickerModal: UIViewControllerRepresentable {

  class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    var isPresented: Binding<Bool>
    let selectedImage: Binding<UIImage?>

    init(isPresented: Binding<Bool>, selectedImage: Binding<UIImage?>) {
      self.isPresented = isPresented
      self.selectedImage = selectedImage
    }

    func imagePickerController(
      _ picker: UIImagePickerController,
      didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
      defer {
        picker.dismiss(animated: true, completion: nil)
      }
      if let editedImage = info[.editedImage] as? UIImage {
        self.selectedImage.wrappedValue = editedImage
        return
      } else if let originalImage = info[.originalImage] as? UIImage {
        self.selectedImage.wrappedValue = originalImage
        return
      }
    }

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
      isPresented.wrappedValue = false
    }
  }

  let isPresented: Binding<Bool>
  let selectedImage: Binding<UIImage?>

  func makeCoordinator() -> PhotoPickerModal.Coordinator {
    return Coordinator(isPresented: self.isPresented, selectedImage: self.selectedImage)
  }

  func makeUIViewController(context: UIViewControllerRepresentableContext<PhotoPickerModal>) -> UIImagePickerController {
    print(isPresented)
    let vc = UIImagePickerController()
    vc.delegate = context.coordinator
    return vc
  }

  func updateUIViewController(_ uiViewController: UIImagePickerController, context: UIViewControllerRepresentableContext<PhotoPickerModal>) {

  }
}


let viewController = UIHostingController(rootView:
  PhotoPickerDisplayer()
)
PlaygroundPage.current.liveView = viewController

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