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/** \author Jia Pan */


#ifndef HPP_FCL_COLLISION_DATA_H
#define HPP_FCL_COLLISION_DATA_H

#include <vector>
#include <set>
#include <limits>

#include <hpp/fcl/collision_object.h>
#include <hpp/fcl/config.hh>
#include <hpp/fcl/data_types.h>


namespace hpp
{
namespace fcl
{

const int GST_INDEP HPP_FCL_DEPRECATED = 0;

/// @brief Contact information returned by collision
struct Contact
{
  /// @brief collision object 1
  const CollisionGeometry* o1;

  /// @brief collision object 2
  const CollisionGeometry* o2;

  /// @brief contact primitive in object 1
  /// if object 1 is mesh or point cloud, it is the triangle or point id
  /// if object 1 is geometry shape, it is NONE (-1),
  /// if object 1 is octree, it is the id of the cell
  int b1;


  /// @brief contact primitive in object 2
  /// if object 2 is mesh or point cloud, it is the triangle or point id
  /// if object 2 is geometry shape, it is NONE (-1),
  /// if object 2 is octree, it is the id of the cell
  int b2;
 
  /// @brief contact normal, pointing from o1 to o2
  Vec3f normal;

  /// @brief contact position, in world space
  Vec3f pos;

  /// @brief penetration depth
  FCL_REAL penetration_depth;

 
  /// @brief invalid contact primitive information
  static const int NONE = -1;

  Contact() : o1(NULL),
              o2(NULL),
              b1(NONE),
              b2(NONE)
  {}

  Contact(const CollisionGeometry* o1_, const CollisionGeometry* o2_, int b1_, int b2_) : o1(o1_),
                                                                                          o2(o2_),
                                                                                          b1(b1_),
                                                                                          b2(b2_)
  {}

  Contact(const CollisionGeometry* o1_, const CollisionGeometry* o2_, int b1_, int b2_,
          const Vec3f& pos_, const Vec3f& normal_, FCL_REAL depth_) : o1(o1_),
                                                                      o2(o2_),
                                                                      b1(b1_),
                                                                      b2(b2_),
                                                                      normal(normal_),
                                                                      pos(pos_),
                                                                      penetration_depth(depth_)
  {}

  bool operator < (const Contact& other) const
  {
    if(b1 == other.b1)
      return b2 < other.b2;
    return b1 < other.b1;
  }

  bool operator == (const Contact& other) const
  {
    return o1 == other.o1
            && o2 == other.o2
            && b1 == other.b1
            && b2 == other.b2
            && normal == other.normal
            && pos == other.pos
            && penetration_depth == other.penetration_depth;
  }
  
  bool operator != (const Contact& other) const
  {
    return !(*this == other);
  }
};

struct CollisionResult;

/// @brief flag declaration for specifying required params in CollisionResult
enum CollisionRequestFlag
{
  CONTACT               = 0x00001,
  DISTANCE_LOWER_BOUND  = 0x00002,
  NO_REQUEST            = 0x01000
};

/// @brief request to the collision algorithm
struct CollisionRequest
{  
  /// @brief The maximum number of contacts will return
  size_t num_max_contacts;

  /// @brief whether the contact information (normal, penetration depth and contact position) will return
  bool enable_contact;

  /// Whether a lower bound on distance is returned when objects are disjoint
  bool enable_distance_lower_bound;

  /// @brief whether enable gjk intial guess
  bool enable_cached_gjk_guess;
  
  /// @brief the gjk intial guess set by user
  Vec3f cached_gjk_guess;

  /// @brief Distance below which objects are considered in collision.
  /// See \ref hpp_fcl_collision_and_distance_lower_bound_computation
  FCL_REAL security_margin;

  /// @brief Distance below which bounding volumes are broken down.
  /// See \ref hpp_fcl_collision_and_distance_lower_bound_computation
  FCL_REAL break_distance;

  explicit CollisionRequest(size_t num_max_contacts_,
                   bool enable_contact_ = false,
		   bool enable_distance_lower_bound_ = false,
                   size_t num_max_cost_sources_ = 1,
                   bool enable_cost_ = false,
                   bool use_approximate_cost_ = true)
  HPP_FCL_DEPRECATED;

  explicit CollisionRequest(const CollisionRequestFlag flag, size_t num_max_contacts_) :
    num_max_contacts(num_max_contacts_),
    enable_contact(flag & CONTACT),
    enable_distance_lower_bound (flag & DISTANCE_LOWER_BOUND),
    security_margin (0),
    break_distance (1e-3)
  {
    enable_cached_gjk_guess = false;
    cached_gjk_guess = Vec3f(1, 0, 0);
  }

  CollisionRequest() :
      num_max_contacts(1),
      enable_contact(false),
      enable_distance_lower_bound (false),
      security_margin (0),
      break_distance (1e-3)
    {
      enable_cached_gjk_guess = false;
      cached_gjk_guess = Vec3f(1, 0, 0);
    }

  bool isSatisfied(const CollisionResult& result) const;
};

/// @brief collision result
struct CollisionResult
{
private:
  /// @brief contact information
  std::vector<Contact> contacts;

public:
  Vec3f cached_gjk_guess;

  /// Lower bound on distance between objects if they are disjoint.
  /// See \ref hpp_fcl_collision_and_distance_lower_bound_computation
  /// @note computed only on request (or if it does not add any computational
  /// overhead).
  FCL_REAL distance_lower_bound;

public:
  CollisionResult()
    : distance_lower_bound (std::numeric_limits<FCL_REAL>::max())
  {
  }

  /// @brief Update the lower bound only if the distance in inferior.
  inline void updateDistanceLowerBound (const FCL_REAL& distance_lower_bound_)
  {
    if (distance_lower_bound_ < distance_lower_bound)
      distance_lower_bound = distance_lower_bound_;
  }

  /// @brief add one contact into result structure
  inline void addContact(const Contact& c) 
  {
    contacts.push_back(c);
  }

  /// @brief whether two CollisionResult are the same or not
  inline bool operator ==(const CollisionResult& other) const
  {
    return contacts == other.contacts 
            && distance_lower_bound == other.distance_lower_bound;
  }

  /// @brief return binary collision result
  bool isCollision() const
  {
    return contacts.size() > 0;
  }

  /// @brief number of contacts found
  size_t numContacts() const
  {
    return contacts.size();
  }

  /// @brief get the i-th contact calculated
  const Contact& getContact(size_t i) const
  {
    if(contacts.size() == 0)
      throw std::invalid_argument("The number of contacts is zero. No Contact can be returned.");
    
    if(i < contacts.size()) 
      return contacts[i];
    else
      return contacts.back();
  }

  /// @brief get all the contacts
  void getContacts(std::vector<Contact>& contacts_) const
  {
    contacts_.resize(contacts.size());
    std::copy(contacts.begin(), contacts.end(), contacts_.begin());
  }

  /// @brief clear the results obtained
  void clear()
  {
    contacts.clear();
  }

  /// @brief reposition Contact objects when fcl inverts them
  /// during their construction.
  friend void invertResults(CollisionResult& result);
};


struct DistanceResult;

/// @brief request to the distance computation
struct DistanceRequest
{
  /// @brief whether to return the nearest points
  bool enable_nearest_points;

  /// @brief error threshold for approximate distance
  FCL_REAL rel_err; // relative error, between 0 and 1
  FCL_REAL abs_err; // absoluate error

  /// \deprecated the last argument should be removed.
  DistanceRequest(bool enable_nearest_points_,
                  FCL_REAL rel_err_,
                  FCL_REAL abs_err_,
                  int /*unused*/) HPP_FCL_DEPRECATED :
    enable_nearest_points(enable_nearest_points_),
    rel_err(rel_err_),
    abs_err(abs_err_)
  {
  }

  /// \param enable_nearest_points_ enables the nearest points computation.
  /// \param rel_err_
  /// \param abs_err_
  DistanceRequest(bool enable_nearest_points_ = false,
                  FCL_REAL rel_err_ = 0.0,
                  FCL_REAL abs_err_ = 0.0) :
    enable_nearest_points(enable_nearest_points_),
    rel_err(rel_err_),
    abs_err(abs_err_)
  {
  }

  bool isSatisfied(const DistanceResult& result) const;
};


/// @brief distance result
struct DistanceResult
{

public:

  /// @brief minimum distance between two objects. if two objects are in collision, min_distance <= 0.
  FCL_REAL min_distance;

  /// @brief nearest points
  Vec3f nearest_points[2];

  /// In case both objects are in collision, store the normal
  Vec3f normal;

  /// @brief collision object 1
  const CollisionGeometry* o1;

  /// @brief collision object 2
  const CollisionGeometry* o2;

  /// @brief information about the nearest point in object 1
  /// if object 1 is mesh or point cloud, it is the triangle or point id
  /// if object 1 is geometry shape, it is NONE (-1),
  /// if object 1 is octree, it is the id of the cell
  int b1;

  /// @brief information about the nearest point in object 2
  /// if object 2 is mesh or point cloud, it is the triangle or point id
  /// if object 2 is geometry shape, it is NONE (-1),
  /// if object 2 is octree, it is the id of the cell
  int b2;

  /// @brief invalid contact primitive information
  static const int NONE = -1;
  
  DistanceResult(FCL_REAL min_distance_ =
                 std::numeric_limits<FCL_REAL>::max()):
  min_distance(min_distance_), o1(NULL), o2(NULL), b1(NONE), b2(NONE)
  {
    Vec3f nan (Vec3f::Constant(std::numeric_limits<FCL_REAL>::quiet_NaN()));
    nearest_points [0] = nearest_points [1] = normal = nan;
  }


  /// @brief add distance information into the result
  void update(FCL_REAL distance, const CollisionGeometry* o1_, const CollisionGeometry* o2_, int b1_, int b2_)
  {
    if(min_distance > distance)
    {
      min_distance = distance;
      o1 = o1_;
      o2 = o2_;
      b1 = b1_;
      b2 = b2_;
    }
  }

  /// @brief add distance information into the result
  void update(FCL_REAL distance, const CollisionGeometry* o1_,
              const CollisionGeometry* o2_, int b1_, int b2_,
              const Vec3f& p1, const Vec3f& p2, const Vec3f& normal_)
  {
    if(min_distance > distance)
    {
      min_distance = distance;
      o1 = o1_;
      o2 = o2_;
      b1 = b1_;
      b2 = b2_;
      nearest_points[0] = p1;
      nearest_points[1] = p2;
      normal = normal_;
    }
  }

  /// @brief add distance information into the result
  void update(const DistanceResult& other_result)
  {
    if(min_distance > other_result.min_distance)
    {
      min_distance = other_result.min_distance;
      o1 = other_result.o1;
      o2 = other_result.o2;
      b1 = other_result.b1;
      b2 = other_result.b2;
      nearest_points[0] = other_result.nearest_points[0];
      nearest_points[1] = other_result.nearest_points[1];
      normal = other_result.normal;
    }
  }

  /// @brief clear the result
  void clear()
  {
    min_distance = std::numeric_limits<FCL_REAL>::max();
    o1 = NULL;
    o2 = NULL;
    b1 = NONE;
    b2 = NONE;
  }

  /// @brief whether two DistanceResult are the same or not
  inline bool operator ==(const DistanceResult& other) const
  {
    bool is_same = min_distance == other.min_distance
                  && nearest_points[0] == other.nearest_points[0]
                  && nearest_points[1] == other.nearest_points[1]
                  && o1 == other.o1
                  && o2 == other.o2
                  && b1 == other.b1
                  && b2 == other.b2;

// TODO: check also that two GeometryObject are indeed equal.
    if ((o1 != NULL) xor (other.o1 != NULL)) return false;
    is_same &= (o1 == other.o1);
//    else if (o1 != NULL and other.o1 != NULL) is_same &= *o1 == *other.o1;

    if ((o2 != NULL) xor (other.o2 != NULL)) return false;
    is_same &= (o2 == other.o2);
//    else if (o2 != NULL and other.o2 != NULL) is_same &= *o2 == *other.o2;
  
    return is_same;
  }

};


inline CollisionRequestFlag operator~(CollisionRequestFlag a)
{return static_cast<CollisionRequestFlag>(~static_cast<const int>(a));}

inline CollisionRequestFlag operator|(CollisionRequestFlag a, CollisionRequestFlag b)
{return static_cast<CollisionRequestFlag>(static_cast<const int>(a) | static_cast<const int>(b));}

inline CollisionRequestFlag operator&(CollisionRequestFlag a, CollisionRequestFlag b)
{return static_cast<CollisionRequestFlag>(static_cast<const int>(a) & static_cast<const int>(b));}

inline CollisionRequestFlag operator^(CollisionRequestFlag a, CollisionRequestFlag b)
{return static_cast<CollisionRequestFlag>(static_cast<const int>(a) ^ static_cast<const int>(b));}

inline CollisionRequestFlag& operator|=(CollisionRequestFlag& a, CollisionRequestFlag b)
{return (CollisionRequestFlag&)((int&)(a) |= static_cast<const int>(b));}

inline CollisionRequestFlag& operator&=(CollisionRequestFlag& a, CollisionRequestFlag b)
{return (CollisionRequestFlag&)((int&)(a) &= static_cast<const int>(b));}

inline CollisionRequestFlag& operator^=(CollisionRequestFlag& a, CollisionRequestFlag b)
{return (CollisionRequestFlag&)((int&)(a) ^= static_cast<const int>(b));}

}

} // namespace hpp

#endif