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data class Identifier(val rawValue: UUID)

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data class Team(val id: UUID, val size: Int)

data class TeamMember(val id: String, val name: String)

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sealed class AuthenticationState
data class SignedIn(val userGuid: UUID) : AuthenticationState()
data class StoredCredentials(val credentials: Credentials) : AuthenticationState()
object SignedOut : AuthenticationState()

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sealed class AnalyticsEvent {
    object AccountCreated : AnalyticsEvent()
    data class MessageSent(val conversation: Conversation) : AnalyticsEvent()
    data class ProfileOpened(val participant: Participant) : AnalyticsEvent()

    fun parameters(): Map<Parameter, String> = when (this) {
        AccountCreated -> mapOf()
        is MessageSent -> mapOf(
            Parameter.PARTICIPANT_COUNT to conversation.participants.size.toString(),
            Parameter.IS_ARCHIVED to conversation.isArchived.toString()

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fun renderViewState(viewState: ViewState) = when (viewState) {
  LoadingState -> showLoadingViews()
  is PresentingState -> showPresentingViews(viewState.viewData)
  is ErrorState -> showErrorViews(viewState.message)
}

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sealed class ViewState
object LoadingState : ViewState()
data class PresentingState(val viewData: ContactsViewData) : ViewState()
data class ErrorState(val message: String) : ViewState()

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fun onAuthenticationStateChanged(newState: AuthenticationState) = when (newState) {
  is AuthenticationState.SignedIn -> showSignedIn(newState.userGuid)
  is AuthenticationState.StoredCredentials -> showSignedIn(newState.credentials)
  AuthenticationState.SignedOut -> showSignedOut()
}

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sealed class AuthenticationState {
  data class SignedIn(val userGuid: UUID) : AuthenticationState()
  data class StoredCredentials(val credentials: Credentials) : AuthenticationState()
  object SignedOut : AuthenticationState()
}

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fun <ViewT : View> Activity.bindView(@IdRes idRes: Int): Lazy<ViewT> {
  return lazyUnsychronized {
    findViewById<ViewT>(idRes)
  }
}

class PlanningActivity : AppCompatActivity() {
  private val planningText by bindView<TextView>(R.id.planning_text)
  // or
  private val planningText: TextView by bindView(R.id.planning_text)

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import kotlinx.android.synthetic.main.activity_planning.*

class PlanningActivity : AppCompatActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    setContentView(R.layout.activity_planning)
    planning_text.text = "Hello"
  }
}