Wrapped login screen code in Task

src/main/scala/nova/monadic_sfx/Main.scala

@@ -30,6 +30,7 @@ import io.odin.syntax._
 // import io.odin._
 import io.odin.monix._
 import nova.monadic_sfx.pages.HomePage
+import monix.execution.Callback
 
 object Main extends JFXApp with MainModule {
 
@@ -60,9 +61,10 @@ object Main extends JFXApp with MainModule {
       stage = appStage
     }
     // wait 2 seconds before showing home screen
-    d <- deps
-    fib1 <- d.send().start
+    // d <- deps
+    // fib1 <- d.send().start
     _ <- Task.sleep(2.seconds)
+    loginScene <- LoginPage(appStage, backend, actorSystem)
     _ <- Task {
       // appStage.maximized = true
       appStage.height = 800
@@ -70,24 +72,28 @@ object Main extends JFXApp with MainModule {
       appStage
         .scene()
         .setRoot(
-          LoginPage(appStage, backend, actorSystem)
+          loginScene
         )
     }
     // _ <- fib1.join
   } yield ()
-  application.timed.runToFuture
-    .onComplete(res =>
-      res match {
-        case Failure(exception) => {
-          println("Application start failed. Reason -")
-          exception.printStackTrace()
-        }
-        case Success((duration, _)) =>
-          println(
-            s"Application started successfully in ${duration.toSeconds} seconds"
-          )
+  application.timed.runAsync(
+    new Callback[Throwable, (FiniteDuration, Unit)] {
+
+      override def onSuccess(value: (FiniteDuration, Unit)): Unit = {
+        val (duration, _) = value
+        println(
+          s"Application started successfully in ${duration.toSeconds} seconds"
+        )
       }
-    )
+
+      override def onError(e: Throwable): Unit = {
+        println("Application start failed. Reason -")
+        e.printStackTrace()
+      }
+
+    }
+  )
 
   // Task
   //   .suspend {

src/main/scala/nova/monadic_sfx/pages/LoginPage.scala

@@ -7,6 +7,9 @@ import scalafx.scene.Node
 import scalafx.Includes._
 import scalafx.scene.Parent
 import scalafx.application.JFXApp.PrimaryStage
+import nova.monadic_sfx.http.requests.DummyRequest
+import monix.eval.Task
+import monix.execution.Scheduler
 // import io.odin.syntax._
 // import _root_.monix.eval.Task
 // import io.odin.monix._
@@ -18,33 +21,75 @@ class LoginPage(
     system: akka.actor.ActorSystem
 ) {
 
+  val dummyRequester = new DummyRequest(backend)
+
   //pure function callbacks, but with side effects still
-  private def onLogout(stage: PrimaryStage) = {
-    println("logging out")
-    stage.scene().setRoot(render)
-  }
-  private def onLogin(stage: PrimaryStage) = {
-    println("logging in")
-    stage
-      .scene()
-      .setRoot(HomePage(backend, system, () => onLogout(appStage)))
-  }
-  private lazy val root = new VBox {
-    children = Seq(
-      new TextField {
-        text = "username"
-        editable = true
-      },
-      new TextField {
-        text = "password"
-      },
-      new Button {
-        text = "Login"
-        onAction = () => onLogin(appStage)
+  private def onLogout(stage: PrimaryStage) =
+    for {
+      _ <- Task { println("logging out") }
+      root <- render
+      _ <- Task(stage.scene().setRoot(root))
+    } yield ()
+
+  private def onLogin(stage: PrimaryStage) =
+    Task.deferAction { implicit Scheduler =>
+      for {
+        _ <- Task(println("logging in"))
+        root <- Task {
+          stage
+            .scene()
+            .setRoot(
+              HomePage(
+                backend,
+                system,
+                () => runFxTask(onLogout(appStage))
+              )
+            )
+        }
+      } yield ()
+    }
+
+  private lazy val root = Task.deferAction(implicit scheduler =>
+    Task {
+      new VBox {
+        children = Seq(
+          new Label {
+            text = "username"
+          },
+          new TextField(),
+          new Label {
+            text = "password"
+          },
+          new TextField(),
+          new Button {
+            text = "Login"
+            onAction = () =>
+              runFxTask {
+                Task
+                  .parZip2(
+                    dummyRequester
+                      .send(),
+                    // .executeOn(Scheduler.global)
+                    onLogin(appStage)
+                  )
+              }
+          }
+        )
       }
-    )
+    }
+  )
+  def render: Task[Parent] = root
+
+  /**
+    * Implicitly runs monix task as fire and forget. \
+    * For use in ScalaFX callbacks.
+    *
+    * @param task
+    * @param s
+    */
+  def runFxTask[T](task: => Task[T])(implicit s: Scheduler) = {
+    task.runAsyncAndForget
   }
-  def render: Parent = root
 
 }