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/*  Visualization Library                                                             */
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#ifndef ActorKdTree_INCLUDE_ONCE
#define ActorKdTree_INCLUDE_ONCE

#include <vlCore/AABB.hpp>
#include <vlGraphics/Actor.hpp>
#include <vlCore/math_utils.hpp>
#include <vlCore/Plane.hpp>
#include <vlCore/Collection.hpp>
#include <vlGraphics/ActorTreeAbstract.hpp>

namespace vl
{
  class VLGRAPHICS_EXPORT ActorKdTree: public ActorTreeAbstract
  {
    VL_INSTRUMENT_CLASS(vl::ActorKdTree, ActorTreeAbstract)

  public:
    ActorKdTree()
    {
      VL_DEBUG_SET_OBJECT_NAME()
    }
    virtual int childrenCount() const;
    virtual ActorTreeAbstract* child(int i);
    virtual const ActorTreeAbstract* child(int i) const;

  void buildKdTree(ActorCollection& actors, int max_depth=100, float minimum_volume=0);

  void rebuildKdTree(int max_depth=100, float minimum_volume=0);

  const Plane& plane() const { return mPlane; }

  ActorKdTree* childN() { return mChildN.get(); }
  const ActorKdTree* childN() const { return mChildN.get(); }

  ActorKdTree* childP() { return mChildP.get(); }
  const ActorKdTree* childP() const { return mChildP.get(); }

  ActorKdTree* insertActor(Actor* actor);

  ref<ActorKdTree> kdtreeFromNonLeafyActors(int max_depth=100, float minimum_volume=0);

  void harvestNonLeafActors(ActorCollection& actors);

  private:
    void setChildN(ActorKdTree* child) 
    { 
      VL_CHECK(child); 
      if (mChildN)
        mChildN->mParent = NULL;
      child->mParent = this;
      mChildN=child; 
    }
    void setChildP(ActorKdTree* child) 
    { 
      VL_CHECK(child); 
      if (mChildP)
        mChildP->mParent = NULL;
      child->mParent = this;
      mChildP=child; 
    }
    int scorePlane(const Plane& plane, const ActorCollection& actors);
    bool findBestPlane(Plane& plane, int& counter, ActorCollection& actors);
    void compileTree_internal(ActorCollection& acts, int& counter, int max_depth=100, float minimum_volume=0);
    void computeLocalAABB(const ActorCollection& actors);

  protected:
    Plane mPlane;
    ref<ActorKdTree> mChildN;
    ref<ActorKdTree> mChildP;
  };

}

#endif