jmonkey-test/src/main/scala/wow/doge/mygame/game/GameApp.scala

package wow.doge.mygame.game

import com.jme3.app.SimpleApplication

import com.jme3.app.state.AppState
import monix.execution.{CancelablePromise => Promise}
import monix.execution.CancelableFuture
import monix.bio.Task
import monix.execution.Scheduler
import wow.doge.mygame.executors.GUIExecutorService
import monix.reactive.subjects.ConcurrentSubject
import monix.reactive.MulticastStrategy
import monix.reactive.Observable
import monix.execution.atomic.Atomic
import scala.collection.immutable.Queue

class GameApp(
    // actorSystem: ActorSystem[SpawnProtocol.Command],
    appStates: AppState*
) extends SimpleApplication(appStates: _*) {
  import GameApp._
  // implicit val timeout = Timeout(10.seconds)
  // implicit val scheduler = actorSystem.scheduler

  // private lazy val taskQueueS = new ConcurrentLinkedQueue[MyTask[_]]()
  private lazy val taskQueue2 = Atomic(Queue.empty[MyTask[_]])

  private val tickSubject =
    ConcurrentSubject[Float](multicast = MulticastStrategy.publish)(
      monix.execution.Scheduler.Implicits.global
    )
  // (scheduler)

  override def simpleInitApp(): Unit = {

    println("gameapp" + Thread.currentThread().getName())

    // val ship = ed.createEntity()
    // val mbState = stateManager().state[EntityDataState]().map(_.getEntityData())
    // val mbState = Try(
    //   stateManager()
    //     .state[TestAppState]()
    //     .entity
    // ).toOption.flatten.toRight(println("empty"))
    // // .flatMap(_.entity)
    // val x = mbState.flatMap(
    //   _.query
    //     .filter[TestComponent]("name", new Object())
    //     // .filterOr[TestEntity](
    //     //   Filters
    //     //     .fieldEquals(classOf[TestEntity], "", null)
    //     // )
    //     .component[Tag]()
    //     .component[TestComponent]()
    //     .result
    //     .toRight(println("failed"))
    // )

    // rootNode
    //   .child(geom)
    //   .child(geom)
    //   .child(geom)
    //   .child(geom)
    //   .child(geom)
    //   .child(geom)
    //   .child(geom)
    //   .child(geom)
    // Future(println("hello"))(jmeEC(this))
    // val wbActor: Future[ActorRef[Greeter.Greet]] = actorSystem.ask(
    //   SpawnProtocol.Spawn(
    //     behavior = Greeter(),
    //     name = "listener",
    //     DispatcherSelector.fromConfig("jme-dispatcher"),
    //     _
    //   )
    // )

    // wbActor.map(a => a.ask(Greeter.Greet("hello", _)).map(println))

  }

  def tickObservable: Observable[Float] = tickSubject

  override def simpleUpdate(tpf: Float): Unit = {
    // val rot2 = rot.fromAngleAxis(FastMath.PI, new Vector3f(0, 0, 1))
    // val rotation = geom.getLocalRotation()
    // rotation.add(rot2)
    // geom.rotate(rot2)

    // geom.updateModelBound()
    // geom.updateGeometricState()
    tickSubject.onNext(tpf)
  }

  override def stop(): Unit = {
    tickSubject.onComplete()
    super.stop()
  }

  def enqueueScala[T](cb: () => T): CancelableFuture[T] = {
    val p = Promise[T]()
    // p.success(cb())
    // taskQueueS.add(MyTask(p, cb))
    taskQueue2.transform(_ :+ MyTask(p, cb))
    p.future
  }
// taskQueue2.transform(_ :+ MyTask(p, cb))
//   p
  def enqueueL[T](cb: () => T): Task[T] =
    // Task(Promise[T]()).flatMap { p =>
    //   Task(taskQueue2.transform(_ :+ MyTask(p, cb))) >>
    //     Task.fromCancelablePromise(p)
    // }
    // Task.fromCancelablePromise {
    //   val p = Promise[T]()
    //   taskQueue2.transform(_ :+ MyTask(p, cb))
    //   p
    // }
    Task.deferFuture(enqueueScala(cb))

  // taskQueueS.add(MyTask(p, cb))

  override protected def runQueuedTasks(): Unit = {
    // Option(taskQueueS.poll()).foreach {
    //   case MyTask(p, cb) =>
    //     p.success(cb())
    // }
    taskQueue2.transform { current =>
      current.dequeueOption.fold(current) {
        case (MyTask(p, cb), updated) =>
          p.success(cb())
          updated
      }
    }

    super.runQueuedTasks()
  }

  object JMEExecutorService extends GUIExecutorService {
    override def execute(command: Runnable) =
      enqueue(command)
    // new SingleThreadEventExecutor()
    // sys.addShutdownHook(JMEExecutorService.shutdown())
  }

  lazy val scheduler = Scheduler(JMEExecutorService)
}
object GameApp {
  private[game] case class MyTask[T](p: Promise[T], cb: () => T)
}