// $Id$
//
//  Copyright (C) 2005 Rational Discovery LLC
//
//   @@ All Rights Reserved @@
//  This file is part of the RDKit.
//  The contents are covered by the terms of the BSD license
//  which is included in the file license.txt, found at the root
//  of the RDKit source tree.
//
#include <boost/python.hpp>
#include <RDBoost/Wrap.h>
#include <Geometry/point.h>
namespace python = boost::python;

namespace{
  struct Point3D_pickle_suite : python::pickle_suite
  {
    static python::tuple getinitargs(RDGeom::Point3D const &pt){
      return python::make_tuple(pt.x,pt.y,pt.z);
    }
  };
  struct Point2D_pickle_suite : python::pickle_suite
  {
    static python::tuple getinitargs(RDGeom::Point2D const &pt){
      return python::make_tuple(pt.x,pt.y);
    }
  };
  struct PointND_pickle_suite : python::pickle_suite
  {
    static python::tuple getinitargs(RDGeom::PointND const &pt){
      return python::make_tuple(pt.dimension());
    }
    static python::tuple getstate(RDGeom::PointND const &pt){
      python::list res;
      for(unsigned int i=0;i<pt.dimension();++i){
	res.append(pt[i]);
      }
      return python::tuple(res);
    }
    static void setstate(RDGeom::PointND &pt,python::tuple state){
      unsigned int sz=python::extract<unsigned int>(state.attr("__len__")());
      for(unsigned int i=0;i<sz;++i){
	pt[i]=python::extract<double>(state[i]);
      }
    }
  };

}


namespace RDGeom {
  
  std::string Point3Ddoc = "A class to represent a three-dimensional point\n\
The x, y, and z coordinates can be read and written using either attributes\n\
(i.e. pt.x = 4) or indexing (i.e. pt[0] = 4).\n";
  std::string Point2Ddoc = "A class to represent a two-dimensional point";
  std::string PointNDdoc = "A class to represent an N-dimensional point";
  
  double point3Ddist(const Point3D &pt1, const Point3D &pt2) {
    Point3D tpt(pt1);
    tpt -= pt2;
    return tpt.length();
  }
  double pointNdGetItem(const PointND &self,int idx){
    if(idx>=static_cast<int>(self.dimension()) ||
       idx<-1*static_cast<int>(self.dimension()))
      throw IndexErrorException(idx);
    if(idx<0) idx=self.dimension()+idx;
    return self[idx];
  }
  double pointNdSetItem(PointND &self,int idx,double val){
    if(idx>=static_cast<int>(self.dimension()) ||
       idx<-1*static_cast<int>(self.dimension()))
      throw IndexErrorException(idx);
    if(idx<0) idx=self.dimension()+idx;
    self[idx]=val;
    return val;
  }

  double point3dGetItem(const Point3D &self,int idx){
    switch(idx){
    case 0:
    case -3:
      return self.x;
      break;
    case 1:
    case -2:
      return self.y;
      break;
    case 2:
    case -1:
      return self.z;
      break;
    default:
      throw IndexErrorException(idx);
    }
  }
  
  double point2dGetItem(const Point2D &self,int idx){
    switch(idx){
    case 0:
    case -2:
      return self.x;
      break;
    case 1:
    case -1:
      return self.y;
      break;
    default:
      throw IndexErrorException(idx);
    }
  }
  
  
  struct Point_wrapper {
    static void wrap() {
      python::class_<Point3D>("Point3D", Point3Ddoc.c_str(),
                              python::init<>("Default Constructor"))
        .def(python::init<double, double, double>())
        .def_readwrite("x", &Point3D::x)
        .def_readwrite("y", &Point3D::y)
        .def_readwrite("z", &Point3D::z)
        .def("__getitem__", point3dGetItem)
        .def("__len__",&Point3D::dimension)
        .def("__iadd__", &Point3D::operator+=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Addition to another point")
        .def("__isub__", &Point3D::operator-=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Vector difference")
        .def(python::self - python::self)
        .def(python::self -= python::self)
        .def(python::self + python::self)
        .def(python::self += python::self)
        .def(python::self * double())
        .def(python::self / double())
        .def("__imul__", &Point3D::operator*=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Scalar multiplication")
        .def("__idiv__", &Point3D::operator/=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Scalar division")
        .def("Normalize", &Point3D::normalize,
             "Normalize the vector (using L2 norm)")
        .def("Length", &Point3D::length,
             "Length of the vector")
        .def("Distance", point3Ddist,
             "Distance from this point to another point")
        .def("LengthSq", &Point3D::lengthSq,
             "Square of the length")
        .def("DotProduct", &Point3D::dotProduct,
             "Dot product with another point")
        .def("AngleTo", &Point3D::angleTo,
             "determines the angle between a vector to this point (between 0 and PI)")
        .def("SignedAngleTo", &Point3D::signedAngleTo,
             "determines the signed angle between a vector to this point (between 0 and 2*PI)")
        .def("DirectionVector", &Point3D::directionVector,
             "return a normalized direction vector from this point to another")
        .def("CrossProduct", &Point3D::crossProduct,
             "Get the cross product between two points")

        .def_pickle(Point3D_pickle_suite())
        ;

      
      python::class_<Point2D>("Point2D", Point2Ddoc.c_str(),
                              python::init<>("Default Constructor"))
        .def(python::init<double, double>())
        .def_readwrite("x", &Point2D::x)
        .def_readwrite("y", &Point2D::y)
        .def("__getitem__", point2dGetItem)
        .def("__len__",&Point2D::dimension)
        .def(python::self - python::self)
        .def(python::self -= python::self)
        .def(python::self + python::self)
        .def(python::self += python::self)
        .def(python::self * double())
        .def(python::self / double())
        .def("__imul__", &Point2D::operator*=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Scalar multiplication")
        .def("__idiv__", &Point2D::operator/=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Scalar division")
        .def("Normalize", &Point2D::normalize,
             "Normalize the vector (using L2 norm)")
        .def("Length", &Point2D::length,
             "Length of the vector")
        .def("LengthSq", &Point2D::lengthSq,
             "Square of the length")
        .def("DotProduct", &Point2D::dotProduct,
             "Dot product with another point")
        .def("AngleTo", &Point2D::angleTo,
             "determines the angle between a vector to this point (between 0 and PI)")
        .def("SignedAngleTo", &Point2D::signedAngleTo,
             "determines the signed angle between a vector to this point (between 0 and 2*PI)")
        .def("DirectionVector", &Point2D::directionVector,
             "return a normalized direction vector from this point to another")

        .def_pickle(Point2D_pickle_suite())
        ;

      python::class_<PointND>("PointND", PointNDdoc.c_str(),
                              python::init<unsigned int>())
        .def("__getitem__", pointNdGetItem)
        .def("__setitem__", pointNdSetItem)
        .def("__len__",&PointND::dimension)
        .def("__iadd__", &PointND::operator+=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Addition to another point")
        .def("__isub__", &PointND::operator-=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Vector difference")
        .def(python::self - python::self)
        .def(python::self -= python::self)
        .def(python::self + python::self)
        .def(python::self += python::self)
        .def(python::self * double())
        .def(python::self / double())
        .def("__imul__", &PointND::operator*=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Scalar multiplication")
        .def("__idiv__", &PointND::operator/=,
             python::return_value_policy<python::copy_non_const_reference>(),
             "Scalar division")
        .def("Normalize", &PointND::normalize,
             "Normalize the vector (using L2 norm)")
        .def("Length", &PointND::length,
             "Length of the vector")
        .def("Distance", point3Ddist,
             "Distance from this point to another point")
        .def("LengthSq", &PointND::lengthSq,
             "Square of the length")
        .def("DotProduct", &PointND::dotProduct,
             "Dot product with another point")
        .def("AngleTo", &PointND::angleTo,
             "determines the angle between a vector to this point (between 0 and PI)")
        .def("DirectionVector", &PointND::directionVector,
             "return a normalized direction vector from this point to another")
        //.def("SignedAngleTo", &PointND::signedAngleTo,
        //     "determines the signed angle between a vector to this point (between 0 and 2*PI)")
        //.def("CrossProduct", &PointND::crossProduct,
        //     "Get the cross product between two points")
        .def_pickle(PointND_pickle_suite())
        ;

      python::def("ComputeDihedralAngle",computeDihedralAngle,"calculates the dihedral angle determined by four Point3D objects");
      python::def("ComputeSignedDihedralAngle",computeSignedDihedralAngle,"calculates the signed dihedral angle determined by four Point3D objects");
    }
  };
}

void wrap_point() {
  RDGeom::Point_wrapper::wrap();
}