AppExperiments

using Leap.Unity.Geometry;
using Leap.Unity.RuntimeGizmos;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using Leap.Unity.Interaction;

using Receiver = Leap.Unity.Apps.Launcher.PanelCommandReceiver;
using Leap.Unity.UI;

namespace Leap.Unity.Apps.Launcher {

  public class PanelCommandController : PeriodicBehaviour, IRuntimeGizmoComponent {

    public Sphere visibilitySphere;
    public Point  controllerPoint;

    private void Reset() {
      visibilitySphere = new Sphere(0.10f, this);
      controllerPoint = new Point(this);
    }

    protected virtual void Awake() {
      base.updatePeriod = 4;
    }

    public ActivityManager<Receiver> receiverQueryManager
      = new ActivityManager<Receiver>(
        0.10f,
        (c) => c.GetComponentInParent<Receiver>()
        );

    private Maybe<Receiver> _lastKnownReceiver = Maybe.None;

    public override void PeriodicUpdate() {
      receiverQueryManager.activationRadius = visibilitySphere.radius;

      receiverQueryManager.UpdateActivityQuery(visibilitySphere.center);

      Receiver closestReceiver = null;
      float closestSqrDist = float.PositiveInfinity;
      foreach (var receiver in receiverQueryManager.ActiveObjects) {
        float testSqrDist = (receiver.transform.position
                             - controllerPoint).sqrMagnitude;
        if (testSqrDist < closestSqrDist) {
          closestReceiver = receiver;
          testSqrDist = closestSqrDist;
        }
      }

      if (_lastKnownReceiver != closestReceiver) {
        if (closestReceiver != null) {
          initializeWithNewReceiver(closestReceiver);
        }

        _lastKnownReceiver = closestReceiver;
      }
    }

    public InteractionSlider curvatureAmountSlider;
    public RadioToggleGroup  curvatureTypeToggles;
    public RadioToggleGroup  heldOrientabilityToggles;
    public RadioToggleGroup  heldVisibilityToggles;
    public RadioToggleGroup  handleTypeToggles;

    private Receiver _attachedReceiver;

    private void initializeWithNewReceiver(Receiver receiver) {
      if (receiver == null) {
        renderLossOfSignal();

        curvatureAmountSlider.controlEnabled = false;
        curvatureTypeToggles.controlsEnabled = false;
        heldOrientabilityToggles.controlsEnabled = false;
        heldVisibilityToggles.controlsEnabled = false;
        handleTypeToggles.controlsEnabled = false;

        curvatureTypeToggles.UntoggleAll();
        heldOrientabilityToggles.UntoggleAll();
        heldVisibilityToggles.UntoggleAll();
        handleTypeToggles.UntoggleAll();
      }
      else {
        if (receiver.supportsCurvature) {
          curvatureAmountSlider.controlEnabled = true;
          curvatureTypeToggles.controlsEnabled = true;
        }
        else {
          curvatureAmountSlider.controlEnabled = false;
          curvatureTypeToggles.controlsEnabled = false;
        }
        heldOrientabilityToggles.controlsEnabled = true;
        heldVisibilityToggles.controlsEnabled = true;
        handleTypeToggles.controlsEnabled = true;

        // Initialize sliders and radio buttons with the settings from the receiver.
        curvatureAmountSlider.normalizedHorizontalValue = receiver.GetCurvature();
        curvatureTypeToggles.toggles[(int)receiver.GetCurvatureType()].Toggle();
        heldOrientabilityToggles.toggles[(int)receiver.GetHeldOrientabilityType()].Toggle();
        heldVisibilityToggles.toggles[(int)receiver.GetHeldVisiblityType()].Toggle();
        handleTypeToggles.toggles[(int)receiver.GetHandleType()].Toggle();
      }

      _attachedReceiver = receiver;

      if (receiver != null) {
        renderNewReceiverGained(receiver);
      }
    }

    protected override void Update() {
      base.Update();

      if (_attachedReceiver != null) {
        // If the user interacted with any of the sliders or buttons this frame,
        // update the current receiver with those values.

        if (curvatureAmountSlider.wasSlid) {
          _attachedReceiver.SetCurvature(
            curvatureAmountSlider.normalizedHorizontalValue);
        }
        if (curvatureTypeToggles.wasToggled) {
          _attachedReceiver.SetCurvatureType(
            (CurvatureType)curvatureTypeToggles.activeToggleIdx);
        }
        if (heldOrientabilityToggles.wasToggled) {
          _attachedReceiver.SetHeldOrientabilityType(
            (HeldOrientabilityType)heldOrientabilityToggles.activeToggleIdx);
        }
        if (heldVisibilityToggles.wasToggled) {
          _attachedReceiver.SetHeldVisiblityType(
            (HeldVisiblityType)heldVisibilityToggles.activeToggleIdx);
        }
        if (handleTypeToggles.wasToggled) {
          _attachedReceiver.SetHandleType(
            (HandleType)handleTypeToggles.activeToggleIdx);
        }
      }

    }

    #region Debug Rendering

    private Color renderColor = Color.Lerp(LeapColor.cerulean, Color.cyan, 0.7f);

    private void renderLossOfSignal() {
      // TODO: Currently unused, signal is never nullified.
      DebugPing.Ping(controllerPoint, Color.black);
    }

    private Func<Vector3> getControllerPointFunc = null;
    private Vector3 getControllerPoint() {
      return controllerPoint;
    }

    private Func<Vector3> getReceiverPointFunc = null;
    private Vector3 _lastKnownReceiverPoint = Vector3.zero;
    private Vector3 getReceiverPoint() {
      if (_attachedReceiver != null) {
        _lastKnownReceiverPoint = _attachedReceiver.transform.position;
      }

      return _lastKnownReceiverPoint;
    }

    private void renderNewReceiverGained(Receiver receiver) {

      if (getControllerPointFunc == null) {
        getControllerPointFunc = getControllerPoint;
      }

      if (getReceiverPointFunc == null) {
        getReceiverPointFunc = getReceiverPoint;
      }

      DebugPing.PingCone(getControllerPointFunc,
                         getReceiverPointFunc,
                         renderColor,
                         0.3f,
                         DebugPing.AnimType.Fade);

      DebugPing.Ping(getReceiverPointFunc,
                     renderColor, 0.40f, DebugPing.AnimType.ExpandAndFade);
      DebugPing.Ping(getReceiverPointFunc,
                     renderColor, 0.42f, DebugPing.AnimType.ExpandAndFade);
      DebugPing.Ping(getReceiverPointFunc,
                     renderColor, 0.44f, DebugPing.AnimType.ExpandAndFade);
      DebugPing.Ping(getReceiverPointFunc,
                     renderColor, 0.46f, DebugPing.AnimType.ExpandAndFade);
      DebugPing.Ping(getReceiverPointFunc,
                     renderColor, 0.48f, DebugPing.AnimType.ExpandAndFade);

    }

    private bool _foundAnyReceiver = false;
    public void OnDrawRuntimeGizmos(RuntimeGizmoDrawer drawer) {
      if (!gameObject.activeInHierarchy) return;

      controllerPoint.RenderSphere(renderColor, 3f);
      controllerPoint.Render(renderColor, 3f);

      if (!_foundAnyReceiver) {
        var subtleColor = renderColor.WithAlpha(0.4f);
        visibilitySphere.Render(subtleColor);

        if (_attachedReceiver != null) {
          _foundAnyReceiver = true;
        }
      }
    }

    #endregion

  }

}