@IBAction func signInButton(_ sender: Any) {

    self.view.endEditing(true)
    let email = emailText.text!.lowercased()
    let finalEmail = email.trimmingCharacters(in: .whitespacesAndNewlines)
    let password = passwordText.text!

    if finalEmail.isEmpty || password.isEmpty {

        let alertController = UIAlertController(title: "Error!", message: "Please fill in all the fields.", preferredStyle: .alert)
        alertController.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
        present(alertController, animated: true, completion: nil)

    }else {
      SVProgressHUD.show()

        Auth.auth().signIn(withEmail: email, password: password) { (user, error) in

            if error == nil {
                if let user = user {
                    print("(user.displayName!) has been signed in")

                   SVProgressHUD.dismiss()

        //            self.enter()
             self.performSegue(withIdentifier: "signInHome", sender: nil)

                }else{
                     SVProgressHUD.dismiss()
                   print("error")
                    let alertController = UIAlertController(title: "Low Blow!", message: "incorrect credentials", preferredStyle: .alert)
                    alertController.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
                    self.present(alertController, animated: true, completion: nil)


                    print(error?.localizedDescription as Any)
                }
            }
        }
    }

}