interface Repository  {
    fun firebaseAuthWithGoogle(idToken: String,callback: AuthCallback)
}

interface AuthCallback {
    fun onSuccess()

    fun onError(error: String)
}

class RepositoryImpl(auth: FirebaseAuth) : Repository {

    override fun firebaseAuthWithGoogle(idToken: String,callback: AuthCallback) {
        auth.singInWithCredential().addOnCompleteListener() { task ->
            if (task.isSuccessful) {
                callback.onSuccess()
            } else {
                callback.onError(error: String)
            }
        }
    }

}

interface Interactor {
   fun firebaseAuthWithGoogle(idToken: String,callback: AuthCallback)

}

class InteractorImpl(private val repository: Repository) : Interactor {

    override fun firebaseAuthWithGoogle(idToken: String,callback: AuthCallback) {
        repository. firebaseAuthWithGoogle(idToken,callback)
    }
}


class MainViewModel(private val interactor: Interactor) {

    fun firebaseAuthWithGoogle(idToken: String,callback: AuthCallback) {
        interactor.firebaseAuthWithGoogle(idToken,callback)
    }

}

class MainActivity {

    mainViewModel. firebaseAuthWithGoogle("token",object : AuthCalback {

        override fun onSuccess() {
            toast.show()
        }

        override fun onError() {
            toast.show()
        }
    })
}