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/* Author: Wim Meeussen */

#ifndef URDF_INTERFACE_POSE_H
#define URDF_INTERFACE_POSE_H

#include <cmath>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>

#include <urdf_exception/exception.h>
#include <urdf_model/utils.h>

namespace urdf{

class Vector3
{
public:
  Vector3(double _x,double _y, double _z) {this->x=_x;this->y=_y;this->z=_z;};
  Vector3() {this->clear();};
  double x;
  double y;
  double z;

  void clear() {this->x=this->y=this->z=0.0;};
  void init(const std::string &vector_str)
  {
    this->clear();
    std::vector<std::string> pieces;
    std::vector<double> xyz;
    urdf::split_string( pieces, vector_str, " ");
    for (unsigned int i = 0; i < pieces.size(); ++i){
      if (pieces[i] != ""){
        try {
          xyz.push_back(strToDouble(pieces[i].c_str()));
        } catch(std::runtime_error &) {
          throw ParseError("Unable to parse component [" + pieces[i] + "] to a double (while parsing a vector value)");
        }
      }
    }

    if (xyz.size() != 3)
      throw ParseError("Parser found " + std::to_string(xyz.size())  + " elements but 3 expected while parsing vector [" + vector_str + "]");

    this->x = xyz[0];
    this->y = xyz[1];
    this->z = xyz[2];
  }

  Vector3 operator+(Vector3 vec)
  {
    return Vector3(this->x+vec.x,this->y+vec.y,this->z+vec.z);
  };
};

class Rotation
{
public:
  Rotation(double _x,double _y, double _z, double _w) {this->x=_x;this->y=_y;this->z=_z;this->w=_w;};
  Rotation() {this->clear();};
  void getQuaternion(double &quat_x,double &quat_y,double &quat_z, double &quat_w) const
  {
    quat_x = this->x;
    quat_y = this->y;
    quat_z = this->z;
    quat_w = this->w;
  };
  void getRPY(double &roll,double &pitch,double &yaw) const
  {
    double sqw;
    double sqx;
    double sqy;
    double sqz;

    sqx = this->x * this->x;
    sqy = this->y * this->y;
    sqz = this->z * this->z;
    sqw = this->w * this->w;

    // Cases derived from https://orbitalstation.wordpress.com/tag/quaternion/
    double sarg = -2 * (this->x*this->z - this->w*this->y);
    const double pi_2 = 1.57079632679489661923;
    if (sarg <= -0.99999) {
      pitch = -pi_2;
      roll  = 0;
      yaw   = 2 * atan2(this->x, -this->y);
    } else if (sarg >= 0.99999) {
      pitch = pi_2;
      roll  = 0;
      yaw   = 2 * atan2(-this->x, this->y);
    } else {
      pitch = asin(sarg);
      roll  = atan2(2 * (this->y*this->z + this->w*this->x), sqw - sqx - sqy + sqz);
      yaw   = atan2(2 * (this->x*this->y + this->w*this->z), sqw + sqx - sqy - sqz);
    }

  };
  void setFromQuaternion(double quat_x,double quat_y,double quat_z,double quat_w)
  {
    this->x = quat_x;
    this->y = quat_y;
    this->z = quat_z;
    this->w = quat_w;
    this->normalize();
  };
  void setFromRPY(double roll, double pitch, double yaw)
  {
    double phi, the, psi;

    phi = roll / 2.0;
    the = pitch / 2.0;
    psi = yaw / 2.0;

    this->x = sin(phi) * cos(the) * cos(psi) - cos(phi) * sin(the) * sin(psi);
    this->y = cos(phi) * sin(the) * cos(psi) + sin(phi) * cos(the) * sin(psi);
    this->z = cos(phi) * cos(the) * sin(psi) - sin(phi) * sin(the) * cos(psi);
    this->w = cos(phi) * cos(the) * cos(psi) + sin(phi) * sin(the) * sin(psi);

    this->normalize();
  };

  double x,y,z,w;

  void init(const std::string &rotation_str)
  {
    this->clear();
    Vector3 rpy;
    rpy.init(rotation_str);
    setFromRPY(rpy.x, rpy.y, rpy.z);
  }

  void clear() { this->x=this->y=this->z=0.0;this->w=1.0; }

  void normalize()
  {
    const double squared_norm =
      this->x * this->x +
      this->y * this->y +
      this->z * this->z +
      this->w * this->w;

    // Note: This function historically checked if the norm of the elements
    // equaled 0 using a strict floating point equals (s == 0.0) to prevent a
    // divide by zero error. This comparison will cause the compiler to issue a
    // warning with `-Wfloat-equal`. Comparing against a small epsilon would
    // likely be more ideal, but its choice may be application specific and
    // could change behavior of legacy code if chosen poorly. Using `<=`
    // silences the warning without changing the behavior of this function, even
    // though there are no situations squared_norm can be strictly less than 0.
    if (squared_norm <= 0.0)
    {
      this->x = 0.0;
      this->y = 0.0;
      this->z = 0.0;
      this->w = 1.0;
    }
    else
    {
      const double s = sqrt(squared_norm);
      this->x /= s;
      this->y /= s;
      this->z /= s;
      this->w /= s;
    }
  };

  // Multiplication operator (copied from gazebo)
  Rotation operator*( const Rotation &qt ) const
  {
    Rotation c;

    c.x = this->w * qt.x + this->x * qt.w + this->y * qt.z - this->z * qt.y;
    c.y = this->w * qt.y - this->x * qt.z + this->y * qt.w + this->z * qt.x;
    c.z = this->w * qt.z + this->x * qt.y - this->y * qt.x + this->z * qt.w;
    c.w = this->w * qt.w - this->x * qt.x - this->y * qt.y - this->z * qt.z;

    return c;
  };
  /// Rotate a vector using the quaternion
  Vector3 operator*(Vector3 vec) const
  {
    Rotation tmp;
    Vector3 result;

    tmp.w = 0.0;
    tmp.x = vec.x;
    tmp.y = vec.y;
    tmp.z = vec.z;

    tmp = (*this) * (tmp * this->GetInverse());

    result.x = tmp.x;
    result.y = tmp.y;
    result.z = tmp.z;

    return result;
  };
  // Get the inverse of this quaternion
  Rotation GetInverse() const
  {
    Rotation q;

    double norm = this->w*this->w+this->x*this->x+this->y*this->y+this->z*this->z;

    if (norm > 0.0)
    {
      q.w = this->w / norm;
      q.x = -this->x / norm;
      q.y = -this->y / norm;
      q.z = -this->z / norm;
    }

    return q;
  };


};

class Pose
{
public:
  Pose() { this->clear(); };

  Vector3  position;
  Rotation rotation;

  void clear()
  {
    this->position.clear();
    this->rotation.clear();
  };
};

}

#endif
