object AnyFragmentScreenInjector {

    private var component: AnyComponent? = null

    fun create(): Fragment = if (component == null) {
        val anyComponent = AnyComponent()
        component = anyComponent
        FragmentDestroyObserver(fragment) {
            component = null
        }
        anyComponent.createFragment()
    } else {
        component.createFragment()
    }

    fun inject(fragment: Fragment) {
        if (component == null) {
            component = AnyComponent() // create component
            component.inject(fragment) // inject
            FragmentDestroyObserver(fragment) {
                component = null
            }
        }
    }

    private class FragmentDestroyObserver(
        private val fragment: Fragment,
        private val onDestroy: () -> Unit
    ) : LifecycleObserver {

        init {
            fragment.lifecycle.addObserver(this)
        }

        @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
        private fun onDestroy() = with(fragment) {
            val activity = requireActivity()

            val isRealDestroy = when {
                activity.isChangingConfigurations -> false
                activity.isFinishing              -> true
                else                              -> isRealRemoving
            }

            if (isRealDestroy) {
                onDestroy()
            }
        }

        private val Fragment.isRealRemoving: Boolean
            get() = isRemoving || isAnyParentRemoving()

        private tailrec fun Fragment.isAnyParentRemoving(): Boolean {
            val parent = parentFragment
            return when {
                parent == null    -> false
                parent.isRemoving -> true
                else              -> parent.isAnyParentRemoving()
            }
        }
    }
}