enter code here

@IBOutlet weak var profileImageView: UIImageView!
@IBOutlet weak var tapToChangeProfileButton: UIButton!

var continueButton:RoundedWhiteButton!
var imagePicker:UIImagePickerController!

override func viewDidLoad() {
    super.viewDidLoad()

      continueButton.addTarget(self, action: #selector(handleSignUp), for:
      .touchUpInside)
    let imageTap = UITapGestureRecognizer(target: self, action:
    #selector(openImagePicker))
    profileImageView.isUserInteractionEnabled = true
    profileImageView.addGestureRecognizer(imageTap)
    profileImageView.layer.cornerRadius = profileImageView.bounds.height / 2
    profileImageView.clipsToBounds = true

    imagePicker = UIImagePickerController()
    imagePicker.allowsEditing = true
    imagePicker.sourceType = .photoLibrary
    imagePicker.delegate = self
}

@objc func openImagePicker(_ sender:Any) {
    self.present(imagePicker, animated: true, completion: nil)
}

@objc func handleSignUp() {
    guard let image = profileImageView.image else { return }


    Auth.auth().createUser(withEmail: email, password: pass) { user, error in
        if error == nil && user != nil {
            print("User created!")


            // 1. Upload the profile image to Firebase Storage

            self.uploadProfileImage(image) { url in

                if url != nil {
                    let changeRequest = Auth.auth().currentUser?.createProfileChangeRequest()
                    changeRequest?.displayName = username
                    changeRequest?.photoURL = url

                    changeRequest?.commitChanges { error in
                        if error == nil {
                            print("User display name changed!")

                            self.saveProfile(username: username, profileImageURL: url!) { success in
                                if success {
                                    self.dismiss(animated: true, completion: nil)
                                } else {
                                    self.resetForm()
                                }
                            }

                        } else {
                            print("Error: (error!.localizedDescription)")
                            self.resetForm()
                        }
                    }
                } else {
                    self.resetForm()
                }

            }

        } else {
            self.resetForm()
        }
    }
}

func resetForm() {
    let alert = UIAlertController(title: "Error signing up", message: nil, preferredStyle: .alert)
    alert.addAction(UIAlertAction(title: "Okay", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)

    setContinueButton(enabled: true)
    continueButton.setTitle("Continue", for: .normal)
    activityView.stopAnimating()
}

func uploadProfileImage(_ image:UIImage, completion: @escaping ((_ url:URL?)->())) {
    guard let uid = Auth.auth().currentUser?.uid else { return }
    let storageRef = Storage.storage().reference().child("user/(uid)")

    guard let imageData = UIImageJPEGRepresentation(image, 0.75) else { return }

    let metaData = StorageMetadata()
    metaData.contentType = "image/jpg"

    storageRef.putData(imageData, metadata: metaData) { metaData, error in
        if error == nil, metaData != nil {
            if let url = metaData?.downloadURL() {
                completion(url)
            } else {
                completion(nil)
            }
            // success!
        } else {
            // failed
            completion(nil)
        }
    }
}

func saveProfile(username:String, profileImageURL:URL, completion: @escaping ((_ success:Bool)->())) {
    guard let uid = Auth.auth().currentUser?.uid else { return }
    let databaseRef = Database.database().reference().child("users/profile/(uid)")

    let userObject = [
        "username": username,
        "photoURL": profileImageURL.absoluteString
    ] as [String:Any]

    databaseRef.setValue(userObject) { error, ref in
        completion(error == nil)
    }
}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    picker.dismiss(animated: true, completion: nil)
}


func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

    if let pickedImage = info[UIImagePickerControllerEditedImage] as? UIImage {
        self.profileImageView.image = pickedImage
    }

    picker.dismiss(animated: true, completion: nil)
}