#pragma once

#include <dtEntity/defaultentitysystem.h>
#include <dtEntity/inputinterface.h>
#include <dtEntityOSG/cameracomponent.h>
#include "cameraviewposition.h"
#include <functional>

namespace VCtrl
{
class OrthoMotionModelComponent final
  : public dtEntity::Component
  , public dtEntity::InputCallbackInterface
{
public:
  static const dtEntity::ComponentType TYPE;
  static const dtEntity::StringId ContextIdId;
  static const dtEntity::StringId EnabledId;


  OrthoMotionModelComponent();

  dtEntity::ComponentType GetType() const override { return TYPE; }

  virtual bool IsInstanceOf(dtEntity::ComponentType id) const
  {
    return (id == TYPE);
  }

  void OnAddedToEntity(dtEntity::Entity &entity) override;
  void OnRemovedFromEntity(dtEntity::Entity &entity) override;

  void Finished() override;
  void Tick(float dt);

  unsigned int GetContextId() const { return mContextId.Get(); }
  void SetContextId(unsigned int i) { mContextId.Set(i); }

  bool MouseButtonUp(int button, bool handled, unsigned int contextid) override;
  bool MouseButtonDown(int button, bool handled, unsigned int contextid) override;
  bool MouseWheel(int dir, bool handled, unsigned int contextid) override;
  bool MouseMove(float x, float y, bool handled, unsigned int contextid) override;
  void MouseEnterLeave(bool, unsigned int) override {}

  void performZoom(int dir, const osg::Vec2& zoompoint);

  dtEntityOSG::CameraComponent *GetCamera() const { return mCamera; }


  // First parameter: contextID as returned by OrthoMotionModelComponent::GetContextId
  std::function<void(unsigned int, const BuildingViewer::CameraViewPosition &)> m_callbackCamPosChanged;

private:
  bool m_mouseMovedWhileLeftButtonPressed;

  dtEntity::IntProperty mContextId;
  dtEntity::BoolProperty mEnabled;
  dtEntityOSG::CameraComponent *mCamera = nullptr;
  dtEntity::Entity *mEntity = nullptr;

};

////////////////////////////////////////////////////////////////////////////////
class OrthoMotionModelSystem final
  : public dtEntity::DefaultEntitySystem<OrthoMotionModelComponent>
{
  using BaseClass = dtEntity::DefaultEntitySystem<OrthoMotionModelComponent>;

public:

  static const dtEntity::ComponentType TYPE;

  explicit OrthoMotionModelSystem(dtEntity::EntityManager &em);

  void OnRemoveFromEntityManager(dtEntity::EntityManager &) override;

private:

  void Tick(const dtEntity::Message &m);
  dtEntity::MessageFunctor mTickFunctor;

};
}