/*
 * Project: MoleCuilder
 * Description: creates and alters molecular systems
 * Copyright (C)  2010-2012 University of Bonn. All rights reserved.
 * 
 *
 *   This file is part of MoleCuilder.
 *
 *    MoleCuilder is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    MoleCuilder is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with MoleCuilder.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * BoundaryPolygonSet.cpp
 *
 *  Created on: Jul 29, 2010
 *      Author: heber
 */

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "CodePatterns/MemDebug.hpp"

#include "BoundaryPolygonSet.hpp"

#include <iostream>

#include "BoundaryLineSet.hpp"
#include "BoundaryPointSet.hpp"
#include "BoundaryTriangleSet.hpp"
#include "Atom/TesselPoint.hpp"

#include "CodePatterns/Assert.hpp"
#include "CodePatterns/Info.hpp"
#include "CodePatterns/Log.hpp"
#include "CodePatterns/Verbose.hpp"
#include "Helpers/helpers.hpp"
#include "LinearAlgebra/Plane.hpp"
#include "LinearAlgebra/Vector.hpp"

using namespace std;

/** Constructor for BoundaryPolygonSet.
 */
BoundaryPolygonSet::BoundaryPolygonSet() :
  Nr(-1)
{
  //Info FunctionInfo(__func__);
}
;

/** Destructor of BoundaryPolygonSet.
 * Just clears endpoints.
 * \note When removing triangles from a class Tesselation, use RemoveTesselationTriangle()
 */
BoundaryPolygonSet::~BoundaryPolygonSet()
{
  //Info FunctionInfo(__func__);
  endpoints.clear();
  LOG(5, "DEBUG: Erasing polygon Nr." << Nr << " itself.");
}
;

/** Calculates the normal vector for this triangle.
 * Is made unique by comparison with \a OtherVector to point in the other direction.
 * \param &OtherVector direction vector to make normal vector unique.
 * \return allocated vector in normal direction
 */
Vector * BoundaryPolygonSet::GetNormalVector(const Vector &OtherVector) const
{
  //Info FunctionInfo(__func__);
  // get normal vector
  Vector TemporaryNormal;
  Vector *TotalNormal = new Vector;
  PointSet::const_iterator Runner[3];
  for (int i = 0; i < 3; i++) {
    Runner[i] = endpoints.begin();
    for (int j = 0; j < i; j++) { // go as much further
      Runner[i]++;
      if (Runner[i] == endpoints.end()) {
        ELOG(0, "There are less than three endpoints in the polygon!");
        performCriticalExit();
      }
    }
  }
  TotalNormal->Zero();
  int counter = 0;
  for (; Runner[2] != endpoints.end();) {
    TemporaryNormal = Plane(((*Runner[0])->node->getPosition()),
                            ((*Runner[1])->node->getPosition()),
                            ((*Runner[2])->node->getPosition())).getNormal();
    for (int i = 0; i < 3; i++) // increase each of them
      Runner[i]++;
    (*TotalNormal) += TemporaryNormal;
  }
  TotalNormal->Scale(1. / (double) counter);

  // make it always point inward (any offset vector onto plane projected onto normal vector suffices)
  if (TotalNormal->ScalarProduct(OtherVector) > 0.)
    TotalNormal->Scale(-1.);
  LOG(4, "DEBUG: Normal Vector is " << *TotalNormal << ".");

  return TotalNormal;
}
;

/** Calculates the center point of the triangle.
 * Is third of the sum of all endpoints.
 * \param *center central point on return.
 */
void BoundaryPolygonSet::GetCenter(Vector * const center) const
{
  //Info FunctionInfo(__func__);
  center->Zero();
  int counter = 0;
  for(PointSet::const_iterator Runner = endpoints.begin(); Runner != endpoints.end(); Runner++) {
    (*center) += ((*Runner)->node->getPosition());
    counter++;
  }
  center->Scale(1. / (double) counter);
  LOG(4, "DEBUG: Center of BoundaryPolygonSet is at " << *center << ".");
}

/** Checks whether the polygons contains all three endpoints of the triangle.
 * \param *triangle triangle to test
 * \return true - triangle is contained polygon, false - is not
 */
bool BoundaryPolygonSet::ContainsBoundaryTriangle(const BoundaryTriangleSet * const triangle) const
{
  //Info FunctionInfo(__func__);
  return ContainsPresentTupel(triangle->endpoints, 3);
}
;

/** Checks whether the polygons contains both endpoints of the line.
 * \param *line line to test
 * \return true - line is of the triangle, false - is not
 */
bool BoundaryPolygonSet::ContainsBoundaryLine(const BoundaryLineSet * const line) const
{
  //Info FunctionInfo(__func__);
  return ContainsPresentTupel(line->endpoints, 2);
}
;

/** Checks whether point is any of the three endpoints this triangle contains.
 * \param *point point to test
 * \return true - point is of the triangle, false - is not
 */
bool BoundaryPolygonSet::ContainsBoundaryPoint(const BoundaryPointSet * const point) const
{
  //Info FunctionInfo(__func__);
  for (PointSet::const_iterator Runner = endpoints.begin(); Runner != endpoints.end(); Runner++) {
    if (point == (*Runner)) {
      LOG(4, "DEBUG: Checking against " << **Runner << ": Contained.");
      return true;
    }
  }
  return false;
}
;

/** Checks whether point is any of the three endpoints this triangle contains.
 * \param *point TesselPoint to test
 * \return true - point is of the triangle, false - is not
 */
bool BoundaryPolygonSet::ContainsBoundaryPoint(const TesselPoint * const point) const
{
  //Info FunctionInfo(__func__);
  for (PointSet::const_iterator Runner = endpoints.begin(); Runner != endpoints.end(); Runner++)
    if (point == (*Runner)->node) {
      LOG(4, "DEBUG: Checking against " << **Runner << ": Contained.");
      return true;
    }
  return false;
}
;

/** Checks whether given array of \a *Points coincide with polygons's endpoints.
 * \param **Points pointer to an array of BoundaryPointSet
 * \param dim dimension of array
 * \return true - set of points is contained in polygon, false - is not
 */
bool BoundaryPolygonSet::ContainsPresentTupel(const BoundaryPointSet * const * Points, const int dim) const
{
  //Info FunctionInfo(__func__);
  int counter = 0;
  LOG(5, "DEBUG Polygon is " << *this);
  for (int i = 0; i < dim; i++) {
    LOG(5, "DEBUG: Testing endpoint " << *Points[i]);
    if (ContainsBoundaryPoint(Points[i])) {
      counter++;
    }
  }

  if (counter == dim)
    return true;
  else
    return false;
}
;

/** Checks whether given PointList coincide with polygons's endpoints.
 * \param &endpoints PointList
 * \return true - set of points is contained in polygon, false - is not
 */
bool BoundaryPolygonSet::ContainsPresentTupel(const PointSet &endpoints) const
{
  //Info FunctionInfo(__func__);
  size_t counter = 0;
  LOG(5, "DEBUG: Polygon is " << *this);
  for (PointSet::const_iterator Runner = endpoints.begin(); Runner != endpoints.end(); Runner++) {
    LOG(5, "DEBUG:  Testing endpoint " << **Runner);
    if (ContainsBoundaryPoint(*Runner))
      counter++;
  }

  if (counter == endpoints.size())
    return true;
  else
    return false;
}
;

/** Checks whether given set of \a *Points coincide with polygons's endpoints.
 * \param *P pointer to BoundaryPolygonSet
 * \return true - is the very triangle, false - is not
 */
bool BoundaryPolygonSet::ContainsPresentTupel(const BoundaryPolygonSet * const P) const
{
  return ContainsPresentTupel((const PointSet) P->endpoints);
}
;

/** Gathers all the endpoints' triangles in a unique set.
 * \return set of all triangles
 */
TriangleSet * BoundaryPolygonSet::GetAllContainedTrianglesFromEndpoints() const
{
  //Info FunctionInfo(__func__);
  pair<TriangleSet::iterator, bool> Tester;
  TriangleSet *triangles = new TriangleSet;

  for (PointSet::const_iterator Runner = endpoints.begin(); Runner != endpoints.end(); Runner++)
    for (LineMap::const_iterator Walker = (*Runner)->lines.begin(); Walker != (*Runner)->lines.end(); Walker++)
      for (TriangleMap::const_iterator Sprinter = (Walker->second)->triangles.begin(); Sprinter != (Walker->second)->triangles.end(); Sprinter++) {
        //LOG(0, " Testing triangle " << *(Sprinter->second));
        if (ContainsBoundaryTriangle(Sprinter->second)) {
          Tester = triangles->insert(Sprinter->second);
          if (Tester.second)
            LOG(4, "DEBUG: Adding triangle " << *(Sprinter->second));
        }
      }

  LOG(3, "DEBUG: The Polygon of " << endpoints.size() << " endpoints has " << triangles->size() << " unique triangles in total.");
  return triangles;
}
;

/** Fills the endpoints of this polygon from the triangles attached to \a *line.
 * \param *line lines with triangles attached
 * \return true - polygon contains endpoints, false - line was NULL
 */
bool BoundaryPolygonSet::FillPolygonFromTrianglesOfLine(const BoundaryLineSet * const line)
{
  //Info FunctionInfo(__func__);
  pair<PointSet::iterator, bool> Tester;
  if (line == NULL)
    return false;
  LOG(3, "DEBUG: Filling polygon from line " << *line);
  for (TriangleMap::const_iterator Runner = line->triangles.begin(); Runner != line->triangles.end(); Runner++) {
    for (int i = 0; i < 3; i++) {
      Tester = endpoints.insert((Runner->second)->endpoints[i]);
      if (Tester.second)
        LOG(4, "DEBUG:   Inserting endpoint " << *((Runner->second)->endpoints[i]));
    }
  }

  return true;
}
;

/** output operator for BoundaryPolygonSet.
 * \param &ost output stream
 * \param &a boundary polygon
 */
ostream &operator <<(ostream &ost, const BoundaryPolygonSet &a)
{
  ost << "[" << a.Nr << "|";
  for (PointSet::const_iterator Runner = a.endpoints.begin(); Runner != a.endpoints.end();) {
    ost << (*Runner)->node->getName();
    Runner++;
    if (Runner != a.endpoints.end())
      ost << ",";
  }
  ost << "]";
  return ost;
}
;