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/** \author Jia Pan */


#ifndef FCL_BV_NODE_H
#define FCL_BV_NODE_H

#include "fcl/math/vec_3f.h"
#include "fcl/math/matrix_3f.h"

#include "fcl/BV/BV.h"
#include <iostream>

namespace fcl
{

/// @brief BVNodeBase encodes the tree structure for BVH
struct BVNodeBase
{
  /// @brief An index for first child node or primitive
  /// If the value is positive, it is the index of the first child bv node
  /// If the value is negative, it is -(primitive index + 1)
  /// Zero is not used.
  int first_child;

  /// @brief The start id the primitive belonging to the current node. The index is referred to the primitive_indices in BVHModel and from that
  /// we can obtain the primitive's index in original data indirectly.
  int first_primitive;

  /// @brief The number of primitives belonging to the current node 
  int num_primitives;

  /// @brief Whether current node is a leaf node (i.e. contains a primitive index
  inline bool isLeaf() const { return first_child < 0; }

  /// @brief Return the primitive index. The index is referred to the original data (i.e. vertices or tri_indices) in BVHModel
  inline int primitiveId() const { return -(first_child + 1); }

  /// @brief Return the index of the first child. The index is referred to the bounding volume array (i.e. bvs) in BVHModel
  inline int leftChild() const { return first_child; }

  /// @brief Return the index of the second child. The index is referred to the bounding volume array (i.e. bvs) in BVHModel
  inline int rightChild() const { return first_child + 1; }
};

/// @brief A class describing a bounding volume node. It includes the tree structure providing in BVNodeBase and also the geometry data provided in BV template parameter.
template<typename BV>
struct BVNode : public BVNodeBase
{
  /// @brief bounding volume storing the geometry
  BV bv;

  /// @brief Check whether two BVNode collide
  bool overlap(const BVNode& other) const
  {
    return bv.overlap(other.bv);
  }

  /// @brief Compute the distance between two BVNode. P1 and P2, if not NULL and the underlying BV supports distance, return the nearest points.
  FCL_REAL distance(const BVNode& other, Vec3f* P1 = NULL, Vec3f* P2 = NULL) const
  {
    return bv.distance(other.bv, P1, P2);
  }

  /// @brief Access the center of the BV
  Vec3f getCenter() const { return bv.center(); }

  /// @brief Access the orientation of the BV
  Matrix3f getOrientation() const { return Matrix3f::getIdentity(); }
};

template<>
inline Matrix3f BVNode<OBB>::getOrientation() const 
{
  return Matrix3f(bv.axis[0][0], bv.axis[1][0], bv.axis[2][0],
                  bv.axis[0][1], bv.axis[1][1], bv.axis[2][1],
                  bv.axis[0][2], bv.axis[1][2], bv.axis[2][2]);
}

template<>
inline Matrix3f BVNode<RSS>::getOrientation() const 
{
  return Matrix3f(bv.axis[0][0], bv.axis[1][0], bv.axis[2][0],
                  bv.axis[0][1], bv.axis[1][1], bv.axis[2][1],
                  bv.axis[0][2], bv.axis[1][2], bv.axis[2][2]);
}

template<>
inline Matrix3f BVNode<OBBRSS>::getOrientation() const 
{
  return Matrix3f(bv.obb.axis[0][0], bv.obb.axis[1][0], bv.obb.axis[2][0],
                  bv.obb.axis[0][1], bv.obb.axis[1][1], bv.obb.axis[2][1],
                  bv.obb.axis[0][2], bv.obb.axis[1][2], bv.obb.axis[2][2]);
}


}

#endif
