class TaskOneTwo: UIViewController {

    @IBOutlet weak var usernameTextField: UITextField!
    @IBOutlet weak var passwordTextField: UITextField!
    @IBOutlet weak var loginButtonPressed: UIButton!
    @IBOutlet weak var logoutButtonPressed: UIButton!
    @IBOutlet weak var registerButtonPressed: UIButton!
    @IBOutlet weak var messageLabel: UILabel!


    @IBAction func loginFunction(_ sender: UIButton) {

        if let username = usernameTextField.text, let password = passwordTextField.text {
            if UserDefaults.standard.value(forKey: username) as? String == password {
                messageLabel.text = "You have logged in successfully!"
                UserDefaults.standard.set(true, forKey: "isUserLogged")
                logoutButtonPressed.isHidden = false;
                loginButtonPressed.isHidden = true
                registerButtonPressed.isHidden = true
            } else {
                messageLabel.text = "Invalid credentials!"
            }
        }

    }

    @IBAction func registerFunction(_ sender: UIButton) {

        if let username = usernameTextField.text, let password = passwordTextField.text {
            if !username.isEmpty && !password.isEmpty {
                UserDefaults.standard.set(password, forKey: username)
                messageLabel.text = "You have registered successfully"
            }
        }
    }

    @IBAction func logoutFunction(_ sender: UIButton) {
        UserDefaults.standard.set(false, forKey: "isUserLogged")
        loginButtonPressed.isHidden = false
        registerButtonPressed.isHidden = false
        logoutButtonPressed.isHidden = true
        messageLabel.text = "You have logged out successfully!"
    }

    func loggedUserView() {

        loginButtonPressed.isHidden = false
        registerButtonPressed.isHidden = false
        logoutButtonPressed.isHidden = true
    }

    override func viewDidLoad() {

        if UserDefaults.standard.bool(forKey: "isUserLogged") {
            loggedUserView()
        }

    }


    class TaskOneTwo: UIViewController {

    @IBOutlet weak var usernameTextField: UITextField!
    @IBOutlet weak var passwordTextField: UITextField!
    @IBOutlet weak var loginButtonPressed: UIButton!
    @IBOutlet weak var logoutButtonPressed: UIButton!
    @IBOutlet weak var registerButtonPressed: UIButton!
    @IBOutlet weak var messageLabel: UILabel!


    @IBAction func loginFunction(_ sender: UIButton) {

        if let username = usernameTextField.text, let password = passwordTextField.text {
            if UserDefaults.standard.value(forKey: username) as? String == password {
                messageLabel.text = "You have logged in successfully!"
                UserDefaults.standard.set(true, forKey: "isUserLogged")
                logoutButtonPressed.isHidden = false;
                loginButtonPressed.isHidden = true
                registerButtonPressed.isHidden = true
            } else {
                messageLabel.text = "Invalid credentials!"
            }
        }

    }

    @IBAction func registerFunction(_ sender: UIButton) {

        if let username = usernameTextField.text, let password = passwordTextField.text {
            if !username.isEmpty && !password.isEmpty {
                UserDefaults.standard.set(password, forKey: username)
                messageLabel.text = "You have registered successfully"
            }
        }
    }

    @IBAction func logoutFunction(_ sender: UIButton) {
        UserDefaults.standard.set(false, forKey: "isUserLogged")
        loginButtonPressed.isHidden = false
        registerButtonPressed.isHidden = false
        logoutButtonPressed.isHidden = true
        messageLabel.text = "You have logged out successfully!"
    }

    func loggedUserView() {

        loginButtonPressed.isHidden = false
        registerButtonPressed.isHidden = false
        logoutButtonPressed.isHidden = true
    }

    override func viewDidLoad() {

        if UserDefaults.standard.bool(forKey: "isUserLogged") {
            loggedUserView()
        }

    }
}