import UIKit
    import Firebase

    class LoginViewController: UIViewController {

         var ref: DatabaseReference!

        override func viewDidLoad() {
            super.viewDidLoad()
        }

        @IBOutlet weak var emailTextOutlet: UITextField!
        @IBOutlet weak var passwordTextOutlet: UITextField!


        @IBAction func loginAction(_ sender: UIButton) {
            guard let email = emailTextOutlet.text, let password = passwordTextOutlet.text else { return }

            Auth.auth().signIn(withEmail: email, password: password) { (user, error) in
                if error != nil {
                    print(error?.localizedDescription ?? "")
                } else {
                    self.performSegue(withIdentifier: "loginToNotes", sender: self)
                }
            }

        }

        @IBAction func registerAction(_ sender: UIButton) {
            guard let userName = emailTextOutlet.text, let userPassWord = passwordTextOutlet.text else {return}

            Auth.auth().createUser(withEmail: userName, password: userPassWord) { (user, error) in
                if error != nil {
                    print(error?.localizedDescription ?? "")
                } else {

                    guard let uid = Auth.auth().currentUser?.uid, let lowerBound = userName.range(of: "@")?.lowerBound else {return}
                    let loweredUsername = userName.substring(to: lowerBound)

                    let value = ["name": loweredUsername] as [String : Any]
                    self.ref = Database.database().reference()
                    self.ref.child("userAccounts").child(uid).setValue(value, withCompletionBlock: { (error, dataRef) in
                        if error != nil {
                            print(error?.localizedDescription as Any)
                        } else {

                            print("User is successfully registered with an email of \(user?.email ?? "") and name of \(loweredUsername)")
                        }

                    })

                }
            }
        }


        override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

            if segue.identifier == "loginToNotes", let username = emailTextOutlet.text, let destination = segue.destination as? NotesTableViewController  {
                guard let lowerBound = username.range(of: "@")?.lowerBound else{ return}
                    let justUsername = username.substring(to: lowerBound)

                    destination.currentUserName = justUsername
                }
            }

    }