package wow.doge.mygame

import com.jme3.app.SimpleApplication
import com.jme3.app.state.AppStateManager
import scala.reflect.ClassTag
import com.jme3.app.state.AppState
import com.jme3.scene.Node
import com.jme3.scene.Spatial
import com.simsilica.es.EntityData
import com.simsilica.es.EntityComponent
import com.simsilica.es.EntityId
import akka.actor.typed.ActorRef
import akka.util.Timeout
import akka.actor.typed.Scheduler
import monix.bio.Task
import com.jme3.input.InputManager
import com.jme3.input.controls.Trigger
import com.jme3.input.controls.InputListener
import com.jme3.math.Vector3f
import wow.doge.mygame.math.ImVector3f
import com.jme3.scene.Geometry
import wow.doge.mygame.state.CardinalDirection
import wow.doge.mygame.subsystems.movement.CanMove
import com.jme3.renderer.Camera
import scala.jdk.CollectionConverters._
import wow.doge.mygame.utils.JFXConsoleStreamable
import com.jme3.app.Application
import com.jme3.scene.SceneGraphVisitor
import monix.reactive.Observable
import com.jme3.asset.AssetManager
import com.jme3.asset.AssetLocator
import com.jme3.input.controls.ActionListener
import monix.reactive.OverflowStrategy
import monix.execution.Ack
import monix.execution.Cancelable
import monix.execution.cancelables.SingleAssignCancelable
import com.jme3.input.Action
import com.jme3.bullet.PhysicsSpace
import com.jme3.bullet.collision.PhysicsCollisionListener
import com.jme3.bullet.collision.PhysicsCollisionEvent
import com.jme3.bullet.PhysicsTickListener
import monix.reactive.observers.Subscriber
import monix.execution.Ack.Continue
import monix.execution.Ack.Stop
import com.jme3.bullet.BulletAppState
import wow.doge.mygame.state.MyBaseState
import monix.bio.UIO
import com.jme3.bullet.control.BetterCharacterControl
import com.jme3.scene.control.AbstractControl
import com.jme3.scene.CameraNode
import com.jme3.scene.control.CameraControl.ControlDirection
import com.jme3.bullet.control.AbstractPhysicsControl
import com.jme3.scene.control.Control
import com.typesafe.scalalogging.Logger
import com.typesafe.scalalogging.LazyLogging
import com.jme3.input.controls.AnalogListener
import com.jme3.math.Quaternion
import com.jme3.math.FastMath
import wow.doge.mygame.subsystems.movement.RotateDir

case class ActionEvent(binding: Action, value: Boolean, tpf: Float)
case class AnalogEvent(binding: Action, value: Float, tpf: Float)
case class PhysicsTickEvent(space: PhysicsSpace, tpf: Float)

package object implicits {
  type PrePhysicsTickEvent = PhysicsTickEvent
  type PhysicsTickObservable =
    Observable[Either[PrePhysicsTickEvent, PhysicsTickEvent]]

  implicit class JMEAppExt(private val app: Application) extends AnyVal {

    // /**
    //   * Blocking task. Execute on a thread pool meant for blocking operations.
    //   * Prefer [[wow.doge.mygame.implicits.JMEAppExt#enqueueT]] instead.
    //   *
    //   * @param cb
    //   * @param ec
    //   * @return
    //   */
    // def enqueueF[T](cb: () => T)(implicit ec: ExecutionContext): Future[T] =
    //   Future {
    //     app
    //       .enqueue(new Callable[T]() {
    //         override def call(): T = cb()
    //       })
    //       .get()
    //   }

    // /**
    //   * Blocking task. Execute on a thread pool meant for blocking operations.
    //   * Same as enqueue, but returns a Monix Task instead of Future
    //   * @param cb
    //   * @param ec
    //   * @return
    //   */
    // def enqueueL[T](cb: () => T): Task[T] =
    //   Task
    //     .deferFutureAction(implicit s => enqueueF(cb))

    def enqueueF[T](cb: => T) =
      app.enqueue(new Runnable {
        override def run() = cb
      })

    def enqueueT(cb: => Unit) =
      Task(enqueueF(cb))
  }
  implicit class StateManagerExt(private val sm: AppStateManager)
      extends AnyVal {
    def state[S <: AppState]()(implicit c: ClassTag[S]): S =
      sm.getState(c.runtimeClass.asInstanceOf[Class[S]])

  }

  implicit class SimpleApplicationExt[T <: SimpleApplication](private val sa: T)
      extends AnyVal {
    def stateManager: AppStateManager = sa.getStateManager()
    def inputManager: InputManager = sa.getInputManager()
    def assetManager: AssetManager = sa.getAssetManager()
    def guiNode = sa.getGuiNode()
    def flyCam = Option(sa.getFlyByCamera())
    def camera = sa.getCamera()
    def viewPort = sa.getViewPort()
    def rootNode = sa.getRootNode()

    def observableTick: Observable[Float] =
      Observable.create(OverflowStrategy.Unbounded) { sub =>
        val c = SingleAssignCancelable()
        val as = new MyBaseState {

          override def init(): Unit = {}

          override def update(tpf: Float) = {
            if (sub.onNext(tpf) == Ack.Stop)
              c.cancel()
          }

          override def stop(): Unit = {}

          override def onEnable() = {}
          override def onDisable() = {}
        }
        sa.stateManager.attach(as)
        c := Cancelable(() => sa.stateManager.detach(as))
        c
      }
  }

  implicit class NodeExt[T <: Node](private val n: T) extends AnyVal {

    /**
      * Attaches the given child
      *
      * @param s
      * @return
      */
    def withChild(s: Spatial): Node = {
      n.attachChild(s)
      n
    }

    /**
      * Gets the list of children as a monix observable
      *
      * @return
      */
    // def children = n.getChildren().asScala.toSeq
    def observableChildren =
      Observable.fromIterable(n.getChildren().asScala)

    def children = LazyList.from(n.getChildren().asScala)

    /**
      * Attach given children
      *
      * @param lst
      */
    def withChildren(lst: Spatial*): Node = {
      for (c <- lst) n.withChild(c)
      n
    }

    def +=(spatial: Spatial) = n.attachChild(spatial)

    def depthFirst(cb: Spatial => Unit) =
      n.depthFirstTraversal(new SceneGraphVisitor() {
        override def visit(s: Spatial) = cb(s)
      })

    def observableDepthFirst(): Observable[Spatial] = {
      def loop(
          subscriber: Subscriber[Spatial],
          spatial: Spatial
      ): Task[Unit] = {
        //spatial can be either a node or a geometry, but it's not a sealed trait
        spatial match {

          case node: Node =>
            Task.deferFuture(subscriber.onNext(node)).flatMap {
              case Ack.Continue => {
                //modifying a node's children list is forbidden
                val children = node.children
                if (!children.isEmpty) {
                  Task.sequence(
                    children.map(c => loop(subscriber, c))
                  ) >> Task.unit
                } else {
                  Task.unit
                }

              }
              case Ack.Stop => Task.unit

            }
          //geomtries do not/cannot have children
          case g: Geometry =>
            Task.deferFuture(subscriber.onNext(g)) >> Task.unit
          case _ => Task.unit
        }
      }

      Observable.create(OverflowStrategy.Unbounded) { sub =>
        implicit val sched = sub.scheduler
        loop(sub, n).runToFuture
      }
    }

    def breadthFirst(cb: Spatial => Unit) =
      n.breadthFirstTraversal(new SceneGraphVisitor() {
        override def visit(s: Spatial) = cb(s)
      })

    def observableBreadthFirst(): Observable[Spatial] = {
      def loop(
          subscriber: Subscriber[Spatial],
          spatials: LazyList[Spatial]
      ): Task[Unit] =
        spatials match {
          // spatial can be either a node or a geometry, but it's not a sealed trait
          case head #:: tail =>
            head match {
              case g: Geometry =>
                Task.deferFuture(subscriber.onNext(g)).flatMap {
                  case Continue =>
                    loop(subscriber, tail)
                  case Stop => Task.unit
                }
              case node: Node =>
                val children = node.children
                Task.deferFuture(subscriber.onNext(node)).flatMap {
                  case Continue =>
                    loop(subscriber, tail #::: children)
                  case Stop => Task.unit
                }
              // case _ => loop(subscriber, tail)
            }
          case LazyList() => Task.unit
        }

      Observable.create(OverflowStrategy.Unbounded) { sub =>
        implicit val sched = sub.scheduler
        loop(sub, LazyList(n)).runToFuture
      }
    }

    def withControl[C <: Control](ctrl: C) = {
      n.addControl(ctrl)
      n
    }

    def withLocalTranslation(dir: ImVector3f) = {
      n.setLocalTranslation(dir.mutable)
      n
    }

    def withRotate(xAngle: Float, yAngle: Float, zAngle: Float) = {
      n.rotate(xAngle, yAngle, zAngle)
      n
    }

    def localRotation = n.getLocalRotation()

    def localTranslation = n.getLocalTranslation()

  }

  implicit class CameraNodeExt(private val cn: CameraNode) {
    def withControlDir(controlDir: ControlDirection) = {
      cn.setControlDir(controlDir)
      cn
    }

    def withLookAt(position: ImVector3f, upVector: ImVector3f) = {
      cn.lookAt(position.mutable, upVector.mutable)
      cn
    }
  }

  implicit class EntityDataExt(private val ed: EntityData) extends AnyVal {

    def query = new EntityQuery(ed)

    // def entities[T <: EntityComponent](entities: Seq[T])
  }

  implicit class EntityExt(private val e: EntityId) extends AnyVal {
    def withComponents(classes: EntityComponent*)(implicit
        ed: EntityData
    ): EntityId = {
      ed.setComponents(e, classes: _*)
      e
    }
  }

  implicit class ActorRefExt[Req](private val a: ActorRef[Req]) extends AnyVal {
    import akka.actor.typed.scaladsl.AskPattern._

    /**
      * @param replyTo
      * @param timeout
      * @param scheduler
      * @return
      */
    def askL[Res](
        replyTo: ActorRef[Res] => Req
    )(implicit timeout: Timeout, scheduler: Scheduler): Task[Res] = {
      Task.deferFuture(a.ask(replyTo)(timeout, scheduler))
    }
    def ??[Res](
        replyTo: ActorRef[Res] => Req
    )(implicit timeout: Timeout, scheduler: Scheduler): Task[Res] =
      askL(replyTo)

    /**
      * Same as [[tell]], but wrapped in a Task
      *
      * @param msg
      * @return
      */
    def tellL(msg: Req) = UIO(a.tell(msg))
    def !!(msg: Req) = tellL(msg)

  }
  // def ?[Res](replyTo: ActorRef[Res] => Req)(implicit timeout: Timeout, scheduler: Scheduler): Future[Res] = {
  //     ask(replyTo)(timeout, scheduler)
  //   }

  implicit class InputManagerExt(private val inputManager: InputManager)
      extends AnyVal {
    def withMapping(mapping: String, triggers: Trigger*): InputManager = {
      inputManager.addMapping(mapping, triggers: _*)
      inputManager
    }

    def withListener(listener: InputListener, mappings: String*) = {
      inputManager.addListener(listener, mappings: _*)
      inputManager
    }

    def observableAction(mappingNames: String*): Observable[ActionEvent] = {

      Observable.create(OverflowStrategy.DropOld(10)) { sub =>
        val c = SingleAssignCancelable()
        val al = new ActionListener {
          override def onAction(
              binding: String,
              value: Boolean,
              tpf: Float
          ): Unit = {
            if (
              sub.onNext(ActionEvent(Action(binding), value, tpf)) == Ack.Stop
            )
              c.cancel()
          }
        }

        inputManager.addListener(al, mappingNames: _*)

        c := Cancelable(() => inputManager.removeListener(al))
        c
      }
    }
    def analogObservable(mappingNames: String*): Observable[AnalogEvent] = {

      Observable.create(OverflowStrategy.DropOld(100)) { sub =>
        val c = SingleAssignCancelable()
        val al = new AnalogListener {
          override def onAnalog(
              binding: String,
              value: Float,
              tpf: Float
          ): Unit = {
            if (
              sub.onNext(AnalogEvent(Action(binding), value, tpf)) == Ack.Stop
            )
              c.cancel()
          }
        }

        inputManager.addListener(al, mappingNames: _*)

        c := Cancelable(() => inputManager.removeListener(al))
        c
      }
    }
  }

  implicit class PhysicsSpaceExt(private val space: PhysicsSpace)
      extends AnyVal {

    def collisionObservable(): Observable[PhysicsCollisionEvent] = {

      Observable.create(OverflowStrategy.Unbounded) { sub =>
        val c = SingleAssignCancelable()
        val cl = new PhysicsCollisionListener {
          override def collision(event: PhysicsCollisionEvent): Unit = {

            if (sub.onNext(event) == Ack.Stop)
              c.cancel()

          }
        }

        space.addCollisionListener(cl)

        c := Cancelable(() => space.removeCollisionListener(cl))
        c
      }
    }

    def physicsTickObservable(): PhysicsTickObservable = {

      Observable.create(OverflowStrategy.Unbounded) { sub =>
        val c = SingleAssignCancelable()
        val cl = new PhysicsTickListener {

          override def prePhysicsTick(space: PhysicsSpace, tpf: Float): Unit = {
            val event = PhysicsTickEvent(space, tpf)
            if (sub.onNext(Left(event)) == Ack.Stop)
              c.cancel()
          }

          override def physicsTick(space: PhysicsSpace, tpf: Float): Unit = {
            val event = PhysicsTickEvent(space, tpf)
            if (sub.onNext(Right(event)) == Ack.Stop)
              c.cancel()
          }

        }

        space.addTickListener(cl)

        c := Cancelable(() => space.removeTickListener(cl))
        c
      }
    }

    //TODO Create a typeclass for this
    def +=(anyObject: Any) = space.add(anyObject)

    def +=(spatial: Spatial) = space.addAll(spatial)

  }

  implicit class AssetManagerExt(private val am: AssetManager) extends AnyVal {
    def registerLocator(
        assetPath: os.RelPath,
        locator: Class[_ <: AssetLocator]
    ): Unit = {
      am.registerLocator(assetPath.toString(), locator)
    }

    def loadModel(assetPath: os.RelPath): Spatial = {
      am.loadModel(assetPath.toString())
    }
  }

  implicit class BulletAppStateExt(private val bas: BulletAppState)
      extends AnyVal {
    def physicsSpace = bas.getPhysicsSpace()
    def speed = bas.getSpeed()
  }

  implicit class BetterCharacterControlExt(
      private val bcc: BetterCharacterControl
  ) {
    def withJumpForce(force: ImVector3f) = {
      bcc.setJumpForce(force.mutable)
      bcc
    }
  }

  implicit class Vector3fExt(private val v: Vector3f) extends AnyVal {
    //TODO add more operations
    def +=(that: Vector3f) = v.addLocal(that)
    def +=(that: ImVector3f) = v.addLocal(that.x, that.y, that.z)
    def +=:(that: ImVector3f) = v += that
    def *=(that: Vector3f) = v.multLocal(that)
    def -=(that: Vector3f) = v.subtractLocal(that)
    def /=(that: Vector3f) = v.divideLocal(that)
    def unary_- = v.negateLocal()
    def immutable = ImVector3f(v.x, v.y, v.z)
  }

  implicit class ImVector3fExt(private val v: ImVector3f) extends AnyVal {
    def +(that: ImVector3f) = v.copy(v.x + that.x, v.y + that.y, v.z + that.z)
    def *(that: ImVector3f) = v.copy(v.x * that.x, v.y * that.y, v.z * that.z)
    def *(f: Float): ImVector3f =
      v.copy(v.x * f, v.y * f, v.z * f)
    // v * ImVector3f(f, f, f)
    def -(that: ImVector3f) = v.copy(v.x - that.x, v.y - that.y, v.z - that.z)
    def /(that: ImVector3f) = v.copy(v.x / that.x, v.y / that.y, v.z / that.z)
    def unary_- = v.copy(-v.x, -v.y, -v.z)
    // def unary_-(that: ImVector3f) = this.copy(this.x, this.y, this.z)
    def mutable = new Vector3f(v.x, v.y, v.z)
  }

  implicit val implCanMoveForBetterCharacterControl =
    new CanMove[BetterCharacterControl] {
      override def move(
          inst: BetterCharacterControl,
          direction: ImVector3f
      ): Unit = {
        // val dir = direction.mutable
        // inst.setViewDirection(dir)
        // inst.setViewDirection(direction.mutable)
        inst.setWalkDirection(direction.mutable.multLocal(50f))
      }
      override def jump(inst: BetterCharacterControl): Unit = inst.jump()
      override def rotate(
          inst: BetterCharacterControl,
          rotateDir: RotateDir
      ): Unit = {
        val q =
          rotateDir match {
            case RotateDir.Left =>
              new Quaternion()
                .fromAngleAxis(-10f * FastMath.DEG_TO_RAD, Vector3f.UNIT_Y)
            case RotateDir.Right =>
              new Quaternion()
                .fromAngleAxis(10 * FastMath.DEG_TO_RAD, Vector3f.UNIT_Y)
          }

        val tmp = new Vector3f()
        inst.getViewDirection(tmp)
        inst.setViewDirection(q.mult(tmp))
      }
      override def stop(inst: BetterCharacterControl) =
        inst.setWalkDirection(Vector3f.ZERO)
    }

  implicit val implCanMoveForGeom = new CanMove[Spatial] with LazyLogging {
    override def move(inst: Spatial, direction: ImVector3f): Unit = {
      inst.move(direction.mutable)
    }
    override def jump(inst: Spatial): Unit =
      logger.warn("`Jump` is not implemented for type `Spatial`")
    override def rotate(inst: Spatial, rotateDir: RotateDir): Unit = {
      rotateDir match {
        case RotateDir.Left  => inst.rotate(0, -0.01f, 0)
        case RotateDir.Right => inst.rotate(0, 0.01f, 0)
      }
    }
    override def stop(inst: Spatial) = {}
  }

  implicit val implJFXConsoleStreamForTextArea =
    new JFXConsoleStreamable[scalafx.scene.control.TextArea] {

      override def println(
          ta: scalafx.scene.control.TextArea,
          text: String
      ): Unit =
        ta.appendText(text + "\n")

      override def print(
          ta: scalafx.scene.control.TextArea,
          text: String
      ): Unit =
        ta.appendText(text)

    }

  // val TasktoUIO = new FunctionK[Task, UIO] {
  //   def apply[T](f: Task[T]): UIO[T] =
  //     f.hideErrors
  // }

}

// Observable.create(OverflowStrategy.Unbounded) { sub =>
//   // val c = SingleAssignCancelable()
//   val visitor = new SceneGraphVisitor {
//     override def visit(s: Spatial): Unit = {
//       sub.onNext(s)
//       // if (sub.onNext(s) == Ack.Stop)
//       // c.cancel()

//     }
//   }
//   n.depthFirstTraversal(visitor)
//   // c := Cancelable(() => ???)
//   // c
//   Cancelable.empty