SocialSignIn.kt

sealed class SocialSignIn {
   sealed class SignIn: SocialSignIn() {
       class Success : SignIn()
       sealed class TwoFactor : SignIn() {
           class Success : TwoFactor()
           class RetryTwoFactor : TwoFactor()
           class Fail : TwoFactor()
           class RetrySocial : TwoFactor()
       }
       class Fail : SignIn()
       class RetrySocial : SignIn()
   }
   sealed class Link: SocialSignIn() {
       class Success : Link()
       sealed class TwoFactor : Link() {
           class Success : TwoFactor()
           class RetryTwoFactor : TwoFactor()
           class Fail : TwoFactor()
           class RetrySocial : TwoFactor()
       }
       class Fail : Link()
       class RetrySocial : Link()
   }
   sealed class Register : SocialSignIn() {
       class Success : Register()
       class Fail : Register()
       class RetrySocial : Register()
   }
   class Error : SocialSignIn()
}