package nova.monadic_sfx.util.reactive

import scala.concurrent.Future

import monix.execution.Ack
import monix.execution.Cancelable
import monix.reactive.Observable
import monix.reactive.Observer
import monix.reactive.observers.Subscriber

object MonixProSubject {
  def from[I, O](
      observer: Observer[I],
      observable: Observable[O]
  ): MonixProSubject[I, O] =
    new Observable[O] with Observer[I] {
      override def onNext(elem: I): Future[Ack] = observer.onNext(elem)
      override def onError(ex: Throwable): Unit = observer.onError(ex)
      override def onComplete(): Unit = observer.onComplete()
      override def unsafeSubscribeFn(subscriber: Subscriber[O]): Cancelable =
        observable.unsafeSubscribeFn(subscriber)
    }
}