package com.github.salomonbrys.kodein.bindings

import com.github.salomonbrys.kodein.*
import kotlinx.coroutines.experimental.Deferred
import kotlinx.coroutines.experimental.async
import kotlin.coroutines.experimental.CoroutineContext

inline fun <reified T: Any> Kodein.Builder.deferredSingleton(
		coroutineContext: CoroutineContext,
		noinline creator: NoArgBindingKodein.() -> T
) =
		EagerSingletonBinding(this, generic(), { async(coroutineContext) { creator() } })

inline fun <reified T : Any> KodeinInjectedBase.awaitInstance(tag: Any? = null) = injector.AwaitInstance<T>(generic(), tag)

fun <T : Any> KodeinInjector.AwaitInstance(type: TypeToken<out T>, tag: Any? = null): InjectedProperty<T> = _register(InjectedInstanceProperty(Kodein.Bind(type, tag)))

class InjectedInstanceProperty<out T : Any, D: Deferred<T>>(bind: Kodein.Bind<D>) : InjectedProperty<T>(Kodein.Key(bind, UnitToken)) {
	@Suppress("UNCHECKED_CAST")
	override fun _getInjection(container: KodeinContainer) = container.nonNullProvider(key.bind).invoke() as T
	override val _type = "instance"
}