class EmailSignInViewModel : GuestRxViewModel(), EmailSignInContract.ViewModel {

    override fun onEmailUpdate(input: Editable) {
        val email = input.toString()
        if (InputUtils.isValidEmail(email)) {
            emailError.set("")
        } else {
            emailError.set(getApplicationString(R.string.auth_error_invalid_email))
        }
        emailSubject.onNext(email)
    }

    override fun onPasswordUpdate(input: Editable) {
        val password = input.toString()
        if (InputUtils.isValidPassword(password)) {
            passwordError.set("")
        } else {
            passwordError.set(getApplicationString(R.string.auth_error_invalid_password))
        }
        passwordSubject.onNext(password)
    }

    override val emailError: ObservableField<String> = ObservableField("")
    override val passwordError: ObservableField<String> = ObservableField("")

    override val submitEnable = ObservableField<Boolean>(false)

    override fun email(): String = emailSubject.value
    override fun password(): String = passwordSubject.value

    protected val emailSubject: BehaviorSubject<String> = BehaviorSubject.create()
    protected val passwordSubject: BehaviorSubject<String> = BehaviorSubject.create()

    open fun init() {
        addDisposables(
                Observable
                        .combineLatest(emailSubject, passwordSubject, BiFunction<String, String, Pair<String, String>> { email, password -> return@BiFunction Pair(email, password) })
                        .subscribe({
                            (email, password) ->
                            submitEnable.set(InputUtils.isValidEmail(email) && InputUtils.isValidPassword(password))
                        })
        )
    }
}