Main activity setup

MainActivity.kt

@AndroidEntryPoint
class MainActivity : BaseActivity() {

    // The model to run authentication and content visibility
    private val model: MainScreenModel by viewModels

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

        MainContent(model) {
            LaunchedEffect(key1 = Unit) {
                finish()
            }
        }
    }
}

@Composable
private fun MainContent(model: MainScreenModel, onTerminate: @Composable () -> Unit) {
    // Create the nav-controller here (see below)
    val navController = rememberNavController(bottomSheetNavigator)
    // Observer the content-wrapping state
    val viewState by model.state.observeAsState(MainScreenUiState.Loading())

    val onGesture: (MainScreenGesture) -> Unit = model::update
    val onBack = { onGesture(MainScreenGesture.Back) }

    @Composable
    fun MainScreenView(viewState: MainScreenUiState) = when(viewState) {
        is MainScreenUiState.Loading -> {
            SplashScreen(viewState.message, onBack)
        }
        MainScreenUiState.Content -> {
            // Content state ruled by navigation graph
            NavigationGraph(navController = navController)
        }
        is MainScreenUiState.Error -> ErrorScreen(
            error = viewState.error,
            onBack = onBack,
            onAction = { onGesture(MainScreenGesture.DismissError) }
        )
        is MainScreenUiState.Login -> CodeLoginScreen(
            viewState = viewState.loginState,
            onGesture = { onGesture(MainScreenGesture.Login(it)) },
        )
        MainScreenUiState.Terminated -> onTerminate()
    }
}