class MainActivity : AppCompatActivity() {

    lateinit var bottomNavView: BottomNavigationView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // later probably in Application class
        setContentView(R.layout.activity_main)
        setupBottomNavigation()
    }

    private fun setupBottomNavigation() {
        val navController = findNavController(R.id.fragment_navigation_host)
        val navGraph = navController.navInflater.inflate(R.navigation.bottom_navigation_graph)
        bottomNavView = findViewById(R.id.bottom_navigation_view)
        bottomNavView.setupWithNavController(navController)
        // Pass the IDs of top-level destinations to AppBarConfiguration to hide back button in the main screens
        val appBarConfiguration = AppBarConfiguration(
            topLevelDestinationIds = setOf(
                R.id.fragment1,
                R.id.fragment2,
                R.id.fragment3,
                R.id.fragment4
            )
        )
        navController.addOnDestinationChangedListener { _, destination, _ ->
            var showNavigationElements = true
            var screenOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
            when (destination.id) {
                R.id.fragment6 -> {
                    showNavigationElements = false
                }
                R.id.fragment2 -> {
                    if (navGraph.startDestination != R.id.fragment2) {
                        navGraph.startDestination = R.id.fragment2
                        navController.graph = navGraph
                    }
                }
                R.id.fragment5 -> {
                    showNavigationElements = false
                    screenOrientation = ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR
                }
            }
            showNavigationUiElements(showNavigationElements)
            requestedOrientation = screenOrientation
        }
    }

    private fun showNavigationUiElements(shouldShow: Boolean) {
        if (shouldShow) {
            bottomNavView.visibility = View.VISIBLE
            supportActionBar?.show()
        } else {
            bottomNavView.visibility = View.GONE
            supportActionBar?.hide()
        }
    }
}

class Fragment12 : BaseFragment() {
    private val args: ModuleOverviewFragmentArgs by navArgs()
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {

        (requireActivity() as AppCompatActivity).supportActionBar?.hide()
        return ComposeView(requireContext()).apply {
            setContent {
                12Navigation(
                    externalNavigation = findNavController(),
                )
            }
        }
    }
}

@Composable
fun 12Navigation(
    externalNavigation: NavController
) {
    val navHostController = NavigationHostController()

    AppTheme {
        NavHost(
            navController = navHostController,
            startDestination = "startingDest"
        ) {
            composable("startingDest") {
                12Introduction(externalNavigation)
            }
        }
    }
}