interface FragmentInjectable

@SuppressLint("Registered")
open class DiActivity : AppCompatActivity(), HasSupportFragmentInjector {

    @Inject
    internal lateinit var fragmentInjector: DispatchingAndroidInjector<Fragment>
    
    override fun supportFragmentInjector() = fragmentInjector

}

fun Application.autoInject() {

    this.registerActivityLifecycleCallbacks(object : Application.ActivityLifecycleCallbacks {
        override fun onActivityCreated(activity: Activity?, p1: Bundle?) {
            activity?.also {
                if (it is HasSupportFragmentInjector) AndroidInjection.inject(it)

                if (it is FragmentActivity) {
                    it.supportFragmentManager.registerFragmentLifecycleCallbacks(
                            object : FragmentManager.FragmentLifecycleCallbacks() {
                                override fun onFragmentCreated(fm: FragmentManager?,
                                                               f: Fragment,
                                                               savedInstanceState: Bundle?) {
                                    if (f is FragmentInjectable) AndroidSupportInjection.inject(f)
                                }

                            }, true)
                }
            }
        }

        override fun onActivityPaused(activity: Activity?) {}
        override fun onActivityResumed(activity: Activity?) {}
        override fun onActivityStarted(activity: Activity?) {}
        override fun onActivityDestroyed(activity: Activity?) {}
        override fun onActivitySaveInstanceState(activity: Activity?, outState: Bundle?) {}
        override fun onActivityStopped(activity: Activity?) {}
    })
    
}