import kotlin.reflect.KClass

interface Singleton
interface IView : Singleton
interface IFragment
interface IUIComponent
abstract class UIComponent : IUIComponent
abstract class View : IView, UIComponent()
abstract class Fragment : IFragment, UIComponent()

val injectionContext = mutableMapOf<KClass<out Singleton>, Singleton>()

fun <T : Singleton> findSingleton(type: KClass<T>): T {
    if (!injectionContext.containsKey(type))
        injectionContext[type] = type.java.newInstance()
    return injectionContext[type] as T
}

fun <T : IFragment> findFragment(type: KClass<T>): T = type.java.newInstance()

inline fun <reified T> findUIComponent(type: KClass<T>): T where T : IView, T : IFragment {
    if (T::class is IView) return findSingleton<T>(type)
    if (T::class is IFragment) return findFragment<T>(type)
    throw RuntimeException("Unknown UIComponent sub type")
}