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/** \author Jia Pan */

#ifndef FCL_BV_FITTER_H
#define FCL_BV_FITTER_H

#include "fcl/BVH/BVH_internal.h"
#include "fcl/BV/kIOS.h"
#include "fcl/BV/OBBRSS.h"
#include <iostream>

namespace fcl
{

/// @brief Compute a bounding volume that fits a set of n points.
template<typename BV>
void fit(Vec3f* ps, int n, BV& bv)
{
  for(int i = 0; i < n; ++i)
  {
    bv += ps[i];
  }
}

template<>
void fit<OBB>(Vec3f* ps, int n, OBB& bv);

template<>
void fit<RSS>(Vec3f* ps, int n, RSS& bv);

template<>
void fit<kIOS>(Vec3f* ps, int n, kIOS& bv);

template<>
void fit<OBBRSS>(Vec3f* ps, int n, OBBRSS& bv);


/// @brief Interface for fitting a bv given the triangles or points inside it.
template<typename BV>
class BVFitterBase
{
public:
  /// @brief Set the primitives to be processed by the fitter
  virtual void set(Vec3f* vertices_, Triangle* tri_indices_, BVHModelType type_) = 0;

  /// @brief Set the primitives to be processed by the fitter, for deformable mesh.
  virtual void set(Vec3f* vertices_, Vec3f* prev_vertices_, Triangle* tri_indices_, BVHModelType type_) = 0;

  /// @brief Compute the fitting BV
  virtual BV fit(unsigned int* primitive_indices, int num_primitives) = 0;

  /// @brief clear the temporary data generated.
  virtual void clear() = 0;
};

/// @brief The class for the default algorithm fitting a bounding volume to a set of points
template<typename BV>
class BVFitter : public BVFitterBase<BV>
{
public:
  /// @brief default deconstructor
  virtual ~BVFitter() {}

  /// @brief Prepare the geometry primitive data for fitting
  void set(Vec3f* vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = NULL;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Prepare the geometry primitive data for fitting, for deformable mesh
  void set(Vec3f* vertices_, Vec3f* prev_vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = prev_vertices_;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Compute a bounding volume that fits a set of primitives (points or triangles).
  /// The primitive data was set by set function and primitive_indices is the primitive index relative to the data
  BV fit(unsigned int* primitive_indices, int num_primitives)
  {
    BV bv;

    if(type == BVH_MODEL_TRIANGLES)             /// The primitive is triangle
    {
      for(int i = 0; i < num_primitives; ++i)
      {
        Triangle t = tri_indices[primitive_indices[i]];
        bv += vertices[t[0]];
        bv += vertices[t[1]];
        bv += vertices[t[2]];

        if(prev_vertices)                      /// can fitting both current and previous frame
        {
          bv += prev_vertices[t[0]];
          bv += prev_vertices[t[1]];
          bv += prev_vertices[t[2]];
        }
      }
    }
    else if(type == BVH_MODEL_POINTCLOUD)       /// The primitive is point
    {
      for(int i = 0; i < num_primitives; ++i)
      {
        bv += vertices[primitive_indices[i]];

        if(prev_vertices)                       /// can fitting both current and previous frame
        {
          bv += prev_vertices[primitive_indices[i]];
        }
      }
    }

    return bv;
  }

  /// @brief Clear the geometry primitive data
  void clear()
  {
    vertices = NULL;
    prev_vertices = NULL;
    tri_indices = NULL;
    type = BVH_MODEL_UNKNOWN;
  }

private:

  Vec3f* vertices;
  Vec3f* prev_vertices;
  Triangle* tri_indices;
  BVHModelType type;
};


/// @brief Specification of BVFitter for OBB bounding volume
template<>
class BVFitter<OBB> : public BVFitterBase<OBB>
{
public:
  /// @brief Prepare the geometry primitive data for fitting
  void set(Vec3f* vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = NULL;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Prepare the geometry primitive data for fitting, for deformable mesh
  void set(Vec3f* vertices_, Vec3f* prev_vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = prev_vertices_;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Compute a bounding volume that fits a set of primitives (points or triangles).
  /// The primitive data was set by set function and primitive_indices is the primitive index relative to the data.
  OBB fit(unsigned int* primitive_indices, int num_primitives);

  /// brief Clear the geometry primitive data
  void clear()
  {
    vertices = NULL;
    prev_vertices = NULL;
    tri_indices = NULL;
    type = BVH_MODEL_UNKNOWN;
  }

private:

  Vec3f* vertices;
  Vec3f* prev_vertices;
  Triangle* tri_indices;
  BVHModelType type;
};


/// @brief Specification of BVFitter for RSS bounding volume
template<>
class BVFitter<RSS> : public BVFitterBase<RSS>
{
public:
  /// brief Prepare the geometry primitive data for fitting
  void set(Vec3f* vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = NULL;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Prepare the geometry primitive data for fitting, for deformable mesh
  void set(Vec3f* vertices_, Vec3f* prev_vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = prev_vertices_;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Compute a bounding volume that fits a set of primitives (points or triangles).
  /// The primitive data was set by set function and primitive_indices is the primitive index relative to the data.
  RSS fit(unsigned int* primitive_indices, int num_primitives);

  /// @brief Clear the geometry primitive data
  void clear()
  {
    vertices = NULL;
    prev_vertices = NULL;
    tri_indices = NULL;
    type = BVH_MODEL_UNKNOWN;
  }

private:

  Vec3f* vertices;
  Vec3f* prev_vertices;
  Triangle* tri_indices;
  BVHModelType type;
};


/// @brief Specification of BVFitter for kIOS bounding volume
template<>
class BVFitter<kIOS> : public BVFitterBase<kIOS>
{
public:
  /// @brief Prepare the geometry primitive data for fitting
  void set(Vec3f* vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = NULL;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Prepare the geometry primitive data for fitting
  void set(Vec3f* vertices_, Vec3f* prev_vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = prev_vertices_;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Compute a bounding volume that fits a set of primitives (points or triangles).
  /// The primitive data was set by set function and primitive_indices is the primitive index relative to the data.
  kIOS fit(unsigned int* primitive_indices, int num_primitives);

  /// @brief Clear the geometry primitive data
  void clear()
  {
    vertices = NULL;
    prev_vertices = NULL;
    tri_indices = NULL;
    type = BVH_MODEL_UNKNOWN;
  }

private:
  Vec3f* vertices;
  Vec3f* prev_vertices;
  Triangle* tri_indices;
  BVHModelType type;
};


/// @brief Specification of BVFitter for OBBRSS bounding volume
template<>
class BVFitter<OBBRSS> : public BVFitterBase<OBBRSS>
{
public:
  /// @brief Prepare the geometry primitive data for fitting
  void set(Vec3f* vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = NULL;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Prepare the geometry primitive data for fitting
  void set(Vec3f* vertices_, Vec3f* prev_vertices_, Triangle* tri_indices_, BVHModelType type_)
  {
    vertices = vertices_;
    prev_vertices = prev_vertices_;
    tri_indices = tri_indices_;
    type = type_;
  }

  /// @brief Compute a bounding volume that fits a set of primitives (points or triangles).
  /// The primitive data was set by set function and primitive_indices is the primitive index relative to the data.
  OBBRSS fit(unsigned int* primitive_indices, int num_primitives);

  /// @brief Clear the geometry primitive data
  void clear()
  {
    vertices = NULL;
    prev_vertices = NULL;
    tri_indices = NULL;
    type = BVH_MODEL_UNKNOWN;
  }

private:

  Vec3f* vertices;
  Vec3f* prev_vertices;
  Triangle* tri_indices;
  BVHModelType type;
};

}

#endif
