package nova.monadic_sfx.ui.components.todo

import scala.concurrent.duration.FiniteDuration

import cats.effect.concurrent.Deferred
import io.odin.Logger
import monix.bio.Task
import monix.catnap.ConcurrentChannel
import monix.catnap.ConsumerF
import monix.execution.Scheduler
import monix.reactive.Observer
import nova.monadic_sfx.util.controls.FontIcon
import nova.monadic_sfx.util.controls.IconLiteral
import nova.monadic_sfx.util.controls.JFXListView
import nova.monadic_sfx.util.reactive.store._
import scalafx.Includes._
import scalafx.beans.property.StringProperty
import scalafx.collections.ObservableBuffer
import scalafx.scene.control.ContextMenu
import scalafx.scene.control.ListCell
import scalafx.scene.control.MenuItem
import scalafx.scene.control.SelectionMode
import scalafx.scene.layout.HBox
import scalafx.scene.text.Text

class TodoListViewOld(
    val listView: JFXListView[Todo] = TodoListViewOld.defaultListView,
    val lvObs: ObservableBuffer[Todo] = ObservableBuffer.empty
) {
  listView.items = lvObs
}

object TodoListViewOld {
  def defaultListView =
    new JFXListView[Todo] {
      contextMenu = new ContextMenu {
        items ++= Seq(
          new MenuItem {
            text = "delete"
          },
          new MenuItem {
            text = "edit"
          }
        )
      }
    }

  implicit class Operations[A](val sink: Observer[A]) extends AnyVal {}

  def defaultListView2(
      store: MonixProSubject[
        TodoListComponentOld.Command,
        (TodoListComponentOld.Command, Vector[Todo])
      ]
  ): Task[JFXListView[Todo]] =
    Task.deferAction(implicit s =>
      Task {
        val todos = store.map { case (_, items) => items }

        val listView = new JFXListView[Todo] { lv =>
          def selectedItems = lv.selectionModel().selectedItems.view
          // items = todos
          // items <-- todos
          // .map(ObservableBuffer.from(_))
          cellFactory = _ =>
            new ListCell[Todo] {
              val _text = StringProperty("")
              val _graphic = new HBox {
                children = Seq(
                  new FontIcon {
                    iconSize = 10
                    iconLiteral = IconLiteral.Gmi10k
                  },
                  new Text {
                    text <== _text
                  }
                )
              }
              item.onChange((_, _, todo) => {
                println("called")
                if (todo != null) {
                  _text() = s"${todo.id} - ${todo.content}"
                  graphic = _graphic
                } else {
                  _text() = ""
                  graphic = null
                }
              })

            }
          selectionModel().selectionMode = SelectionMode.Multiple
          contextMenu = new ContextMenu {
            items ++= Seq(
              new MenuItem {
                text = "Add"
                onAction = _ =>
                  store.sink
                    .onNext(TodoListComponentOld.Add(Todo(1, "blah3")))
              },
              new MenuItem {
                text = "Delete"
                // onAction = _ =>
                //   for {
                //     items <- Option(lv.selectionModel().selectedItems)
                //     _ <- Some(items.foreach(item => deleteSub.onNext(item)))
                //   } yield ()
                onAction = _ =>
                  selectedItems
                    .map(todo => TodoListComponentOld.Delete(todo.id))
                    .foreach(store.sink.onNext)
              },
              new MenuItem {
                text = "Edit"
                // onAction = _ =>
                //   Option(lv.selectionModel().selectedItems).foreach(items =>
                //     items.foreach(item => editSub.onNext(item))
                //   )
              }
            )
          }
        }

        listView
      }
    )

}

private[todo] class TodoListComponentImpure(
    todoListView: TodoListViewOld
) {
  def add(todo: Todo) = todoListView.lvObs += todo
  def find(id: Int) = todoListView.lvObs.find(_.id == id)
  def edit(id: Int, content: String) =
    find(id)
      .map(todo =>
        todoListView.lvObs.replaceAll(
          todo,
          Todo(id, content)
        )
      )
      .getOrElse(false)
}

class TodoListOps private (
    props: TodoListOps.Props
) {
  import props._
//   lazy val internal = new TodoListComponentImpure(todoListView)

//   def add(todo: Todo) = Task(internal.add(todo))
  def add(todo: Todo) = Task(todoListView.lvObs += todo).executeOn(fxScheduler)
  def find(id: Int) =
    Task(todoListView.lvObs.find(_.id == id)).executeOn(fxScheduler)
  def delete(id: Int) =
    (for {
      mbTodo <- find(id)
      _ <- logger.debug(mbTodo.toString())
      res <- Task(
        mbTodo.map(todo => todoListView.lvObs.removeAll(todo))
      )
      _ <- logger.debug(todoListView.lvObs.toString())
    } yield res.getOrElse(false)).executeOn(fxScheduler)
  def edit(id: Int, content: String) =
    (for {
      mbTodo <- find(id)
      res <- Task(
        mbTodo.map(todo =>
          todoListView.lvObs.replaceAll(
            todo,
            Todo(id, content)
          )
        )
      )
    } yield res.getOrElse(false)).executeOn(fxScheduler)
}

object TodoListOps {
  class Props(
      val todoListView: TodoListViewOld,
      val fxScheduler: Scheduler,
      val logger: Logger[Task]
  ) {
    def create = Task(new TodoListOps(this))
  }
}

object TodoListComponentOld {
  sealed trait Complete
  object Complete extends Complete

  sealed trait Command
  // sealed trait Tell extends Command
  // sealed abstract class Ask extends Command

  case class Add(todo: Todo) extends Command
  case class Find(id: Int, result: Deferred[Task, Option[Todo]]) extends Command
  case class Edit(id: Int, content: String) extends Command
  case class Delete(id: Int) extends Command
  // private case class FindInternal(id: Int, result: Deferred[Task, Todo])
  //     extends Ask

  def reducer(
      state: Vector[Todo],
      action: TodoListComponentOld.Command
  ) =
    action match {
      case Add(todo) => state :+ todo
      // case Find(id, result) =>
      case Edit(id, content) => state
      case Delete(id) =>
        state.filterNot(_.id == id)
      case _ => state
    }

  // val store =
  //   Store
  //     .createL[TodoListComponentOld.Command, Vector[Todo]](
  //       TodoListComponentOld.Delete(0),
  //       Vector.empty[Todo],
  //       (s: Vector[Todo], a: TodoListComponentOld.Command) =>
  //         reducer(s, a) -> Observable.empty
  //     )

  class Props(
      val todoListView: TodoListViewOld,
      val fxScheduler: Scheduler,
      val channel: ConcurrentChannel[
        Task,
        TodoListComponentOld.Complete,
        TodoListComponentOld.Command
      ],
      val logger: Logger[Task]
  ) {

    def create =
      for {
        todoListOps <-
          new TodoListOps.Props(todoListView, fxScheduler, logger).create
        consumer = channel.consume.use(ref => todoConsumer(ref, todoListOps))
        _ <- consumer.startAndForget
      } yield (new TodoListComponentOld(this))

    private def todoConsumer(
        consumer: ConsumerF[Task, Complete, Command],
        ops: TodoListOps
    ): Task[Unit] =
      consumer.pull
        .flatMap {
          case Left(complete) => logger.info("Received `Complete` event")
          case Right(command) =>
            logger.debug(s"Received command $command") >>
              (command match {
                // case t: Tell =>
                //   t match {
                //     case Add(todo) => ops.add(todo)
                //     case _         => Task.unit
                //   }
                case Add(todo) => ops.add(todo)
                // case Find(id) =>
                //   for {
                //     p <- Deferred[Task, Todo]
                //     _ <- channel.push(FindInternal(id, p))
                //     res <- p.get
                //   } yield (res)
                case Find(id, result) =>
                  for {
                    mbTodo <- ops.find(id)
                  } yield result.complete(mbTodo)
                // case _ => Task.unit

                case Delete(id) => ops.delete(id)

                case Edit(id, content) => ops.edit(id, content)
              })
        }
        .flatMap(_ => todoConsumer(consumer, ops))

  }

}

class TodoListComponentOld(props: TodoListComponentOld.Props) {
  import props._
  import TodoListComponentOld._

  def send(command: Command) = channel.push(command)

  def ask[T](
      commandBuilder: Deferred[Task, T] => Command
  )(implicit timeout: FiniteDuration) =
    for {
      p <- Deferred[Task, T]
      _ <- channel.push(commandBuilder(p))
      res <- p.get.timeout(timeout)
    } yield res

  def stop = channel.halt(Complete)

  // import scala.concurrent.duration._
  // val x = ask(FindInternal(0, _))(2.seconds)

}

// object TodoListComponent {
//   sealed trait Complete
//   object Complete extends Complete

//   sealed trait Command

//   class Props(
//       val todoListView: TodoListView,
//       val fxScheduler: Scheduler,
//       val channel: ConcurrentChannel[
//         Task,
//         TodoListComponent.Complete,
//         TodoListComponent.Command
//       ]
//   ) {
//     def create = Task(new TodoListComponent(this))
//   }
// }

// class TodoListComponent(props: TodoListComponent.Props) {
//   import props._
//   import TodoListComponent._
//   def init =
//     for {
//       todoListOps <- new TodoListOps.Props(todoListView, fxScheduler).create
//       consumer = channel.consume.use(ref => todoConsumer(ref, todoListOps))
//       _ <- consumer.startAndForget
//     } yield ()

//   def send(command: Command) = channel.push(command)

//   def todoConsumer(
//       consumer: ConsumerF[Task, Complete, Command],
//       ops: TodoListOps
//   ) =
//     consumer.pull.flatMap {
//       case Left(value)  => Task.unit
//       case Right(value) => Task.unit
//     }
// }

// def askHandler(
//     channel: ConcurrentChannel[
//       Task,
//       TodoListComponent.Complete,
//       TodoListComponent.Command
//     ],
//     consumer: ConsumerF[Task, Complete, Command],
//     ops: TodoListOps
// ) =
//   consumer.pull.flatMap {
//     case Left(complete) => Task.unit
//     case Right(command) =>
//       command match {
//         case a: Ask =>
//           a match {
//             case Find(id) =>
//               for {
//                 p <- Deferred[Task, Todo]
//                 _ <- channel.push(FindInternal(id, p))
//                 res <- p.get
//               } yield (res)
//             case FindInternal(id, result) =>
//               for {
//                 mb <- ops.find(id)
//               } yield result.complete(mb.get)
//             case _ => Task.unit
//           }
//         case _ => Task.unit
//       }
//   }