@Module
abstract class TestRiskLevelCalculationFragmentModule {
    @Binds
    @IntoMap
    @VDCKey(TestRiskLevelCalculationFragmentVDC::class)
    abstract fun testRiskLevelFragment(factory: TestRiskLevelCalculationFragmentVDC.Factory): VDCFactory<out VDC>
}

    @Inject lateinit var vdcSource: VDCSource.Factory
    private val vdc: TestRiskLevelCalculationFragmentVDC by vdcsAssisted(
        { vdcSource },
        { factory, handle ->
            factory as TestRiskLevelCalculationFragmentVDC.Factory
            factory.create(handle, navArgs.exampleArgument)
        }
    )

class TestRiskLevelCalculationFragmentVDC @AssistedInject constructor(
    @Assisted private val handle: SavedStateHandle,
    @Assisted private val exampleArg: String?,
    private val context: Context, // App context injected
) : VDC() {

    init {
        Timber.d("VDC: %s", this)
        Timber.d("SavedStateHandle: %s", handle)
        Timber.d("Example arg: %s", exampleArg)
    }

    @AssistedInject.Factory
    interface Factory : VDCFactory<TestRiskLevelCalculationFragmentVDC> {
        fun create(
            handle: SavedStateHandle,
            exampleArg: String?
        ): TestRiskLevelCalculationFragmentVDC
    }
}

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        binding.buttonResetRiskLevel.setOnClickListener { vdc.resetRiskLevel() }
        vdc.riskLevelResetEvent.observe2(this) {
            Toast.makeText(
                requireContext(), "Reset done, please fetch diagnosis keys from server again",
                Toast.LENGTH_SHORT
            ).show()
        }
    }