package outwatchapp.util
import scala.concurrent.Future

import typings.paralleljs.ParallelOptions
import typings.paralleljs.mod.{^ => Parallel}

import scalajs.js
import scalajs.js.|

object ParallelDemo {
  val p =
    new Parallel(js.Array(1, 2, 3, 4, 5), ParallelOptions().setMaxWorkers(2))
  // val pr = new js.Promise()

  // p.map((_: Int) * 2)

  def toFuture[A](p: Parallel[A]): Future[A] = {
    val p2 = scala.concurrent.Promise[A]()
    p.`then`(
      { (v: A) =>
        p2.success(v)
        (): Unit | js.Thenable[Unit]
      },
      { (e: typings.std.Error) =>
        p2.failure(e match {
          case th: Throwable => th
          case _             => js.JavaScriptException(e)
        })
        (): Unit | js.Thenable[Unit]
      }
    )
    p2.future
  }
}