/*
 * Project: MoleCuilder
 * Description: creates and alters molecular systems
 * Copyright (C)  2012 University of Bonn. All rights reserved.
 * Please see the LICENSE file or "Copyright notice" in builder.cpp for details.
 */

/*
 * XmlParser.cpp
 *
 *  Created on: Mar 23, 2012
 *      Author: heber
 */

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

#include "CodePatterns/MemDebug.hpp"

#include <limits>
#include <vector>

#include "CodePatterns/Log.hpp"
#include "CodePatterns/Verbose.hpp"

#include "XmlParser.hpp"

#include "Atom/atom.hpp"
#include "Box.hpp"
#include "Element/element.hpp"
#include "Element/periodentafel.hpp"
#include "molecule.hpp"
#include "MoleculeListClass.hpp"
#include "World.hpp"

#include "Parser/pugixml/pugixml.hpp"

// declare specialized static variables
const std::string FormatParserTrait<xml>::name = "xml";
const std::string FormatParserTrait<xml>::suffix = "xml";
const ParserTypes FormatParserTrait<xml>::type = xml;

const char *box_axis[NDIM] = { "box_a", "box_b", "box_c" };

/**
 * Constructor.
 */
FormatParser< xml >::FormatParser() :
  FormatParser_common(NULL)
{}

/**
 * Destructor.
 */
FormatParser< xml >::~FormatParser()
{}

Vector toVector(const std::string &value)
{
  std::stringstream inputstream(value);
  Vector returnVector;
  for (size_t i=0;i<NDIM;++i)
    inputstream >> std::setprecision(16) >> returnVector[i];
  return returnVector;
}

double toDouble(const std::string &value)
{
  std::stringstream inputstream(value);
  double returnDouble;
  inputstream >> std::setprecision(16) >> returnDouble;
  return returnDouble;
}

std::string fromVector(const Vector&a)
{
  std::stringstream returnstring;
  for (size_t i=0;i<NDIM;++i) {
    returnstring << std::setprecision(16) << a[i];
    if (i != NDIM-1)
      returnstring << std::string(" ");
  }
  return returnstring.str();
}

std::string fromDouble(const double &a)
{
  std::stringstream returnstring;
  returnstring << std::setprecision(16) << a;
  return returnstring.str();
}

std::string fromBoolean(const bool c[])
{
  std::stringstream returnstring;
  for (size_t i=0;i<NDIM;++i) {
    returnstring << (c[i] ? std::string("1") : std::string("0"));
    if (i != NDIM-1)
      returnstring << std::string(" ");
  }
  return returnstring.str();
}

/**
 * Loads an XYZ file into the World.
 *
 * \param XYZ file
 */
void FormatParser< xml >::load(std::istream* file)
{
  // create the molecule
  molecule * const newmol = World::getInstance().createMolecule();
  newmol->ActiveFlag = true;
  // TODO: Remove the insertion into molecule when saving does not depend on them anymore. Also, remove molecule.hpp include
  World::getInstance().getMolecules()->insert(newmol);

  // load file into xml tree
  pugi::xml_document doc;
  doc.load(*file);

  // header
  pugi::xml_node scafacos_test = doc.root().child("scafacos_test");
  data.name = toString(scafacos_test.attribute("name").value());
  data.description = toString(scafacos_test.attribute("description").value());
  data.reference_method = toString(scafacos_test.attribute("reference_method").value());
  data.error_potential = scafacos_test.attribute("error_potential").as_double();
  data.error_field = scafacos_test.attribute("error_field").as_double();
  LOG(1, "INFO: scafacos_test.name is '" << data.name << "'.");
  newmol->setName(data.name);

  // configuration information
  pugi::xml_node configuration = scafacos_test.child("configuration");
  data.config.offset = toVector(configuration.attribute("offset").value());
  for (size_t i=0; i<NDIM; ++i)
    data.config.box.column(i) = toVector(configuration.attribute(box_axis[i]).value());
  World::getInstance().getDomain().setM(data.config.box);
  {
    std::stringstream inputstream(configuration.attribute("periodicity").value());
    for (size_t i=0; i<NDIM; ++i) {
      ASSERT( inputstream.good(),
          "FormatParser< xml >::load() - periodicity attribute has less than 3 entries.");
      inputstream >> data.config.periodicity[i];
    }
  }
  data.config.epsilon = toString(configuration.attribute("epsilon").value());

  // particles
  for(pugi::xml_node::iterator iter = configuration.begin();
      iter != configuration.end(); ++iter) {
    struct scafacos::configuration::particle p;
    p.position = toVector((*iter).attribute("position").value());
    p.q = toDouble((*iter).attribute("q").value());
    p.potential = toDouble((*iter).attribute("potential").value());
    p.field = toVector((*iter).attribute("field").value());
    data.config.p.push_back(p);
    LOG(2, "DEBUG: Parsing particle at " << p.position << ".");
    atom * const newAtom = World::getInstance().createAtom();
    // for the moment each becomes a hydrogen
    newAtom->setType(World::getInstance().getPeriode()->FindElement((atomicNumber_t)1));
    newAtom->setPosition(p.position);
    newmol->AddAtom(newAtom);
  }

  BOOST_FOREACH(atom *_atom, World::getInstance().getAllAtoms())
    LOG(3, "INFO: Atom " << _atom->getName() << " " << *dynamic_cast<AtomInfo *>(_atom) << ".");

  // refresh atom::nr and atom::name
  newmol->getAtomCount();
}

/**
 * Saves the \a atoms into as a XYZ file.
 *
 * \param file where to save the state
 * \param atoms atoms to store
 */
void FormatParser< xml >::save(std::ostream* file, const std::vector<atom *> &atoms) {
  LOG(0, "Saving changes to xml.");

  // fill the structure with updated information
  const Box &domain = World::getInstance().getDomain();
  data.config.box = domain.getM();
  for (size_t i=0;i<NDIM;++i)
    data.config.periodicity[i] = domain.getCondition(i) == BoundaryConditions::Wrap;
  data.config.p.clear();
  for(std::vector<atom*>::const_iterator it = atoms.begin(); it != atoms.end(); it++) {
    struct scafacos::configuration::particle p;
    p.position = (*it)->getPosition();
    p.q = 0.;
    p.potential = 0.;
    p.field = zeroVec;
    data.config.p.push_back(p);
  }

  // create the xml tree
  pugi::xml_document doc;
  pugi::xml_attribute attr;

  // header
  pugi::xml_node xml_scafacos_test = doc.root().append_child();
  xml_scafacos_test.set_name("scafacos_test");
  xml_scafacos_test.append_attribute("name").set_value(data.name.c_str());
  xml_scafacos_test.append_attribute("description").set_value(data.description.c_str());
  xml_scafacos_test.append_attribute("reference_method").set_value(data.reference_method.c_str());
  xml_scafacos_test.append_attribute("error_potential").set_value(data.error_potential);
  xml_scafacos_test.append_attribute("error_field").set_value(data.error_field);

  // configuration
  pugi::xml_node xml_configuration = xml_scafacos_test.append_child();
  xml_configuration.set_name("configuration");
  xml_configuration.append_attribute("offset").set_value(fromVector(data.config.offset).c_str());
  for (size_t i=0; i<NDIM; ++i)
    xml_configuration.append_attribute(box_axis[i]).set_value(fromVector(data.config.box.column(i)).c_str());
  xml_configuration.append_attribute("periodicity").set_value(fromBoolean(data.config.periodicity).c_str());
  xml_configuration.append_attribute("epsilon").set_value(toString(data.config.epsilon).c_str());

  // particles
  for (std::vector<scafacos::configuration::particle>::const_iterator iter = data.config.p.begin();
      iter != data.config.p.end();++iter) {
    pugi::xml_node particle = xml_configuration.append_child();
    particle.set_name("particle");
    particle.append_attribute("position").set_value(fromVector((*iter).position).c_str());
    particle.append_attribute("q").set_value(fromDouble((*iter).q).c_str());
    particle.append_attribute("potential").set_value(fromDouble((*iter).potential).c_str());
    particle.append_attribute("field").set_value(fromVector((*iter).field).c_str());
  }

  // print standard header and save without declaration
  *file << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
  *file << "<!DOCTYPE scafacos_test SYSTEM 'scafacos_test.dtd'>\n";
  doc.save(*file, "\t", pugi::format_no_declaration, pugi::encoding_utf8);
}

#define comparator(x,y) if (x != y) { LOG(2, "DEBUG: Mismatch in " << #x << ": " << x << " != " << y); return false; }
#define num_comparator(x,y) if (fabs(x - y) > MYEPSILON) { LOG(2, "DEBUG: Numeric mismatch in " << #x << ": " << x << " != " << y << " by " << fabs(x - y) << "."); return false; }

bool FormatParser< xml >::scafacos::configuration::particle::operator==(const particle &p) const {
  comparator(position, p.position)
  num_comparator(q, p.q)
  num_comparator(potential, p.potential)
  comparator(field, p.field)
  return true;
}

bool FormatParser< xml >::scafacos::configuration::operator==(const configuration &c) const {
  comparator(offset, c.offset)
  comparator(box, c.box)
  for (size_t i=0;i<NDIM;++i)
    comparator(periodicity[i], c.periodicity[i])
  comparator(epsilon, c.epsilon)

  if (p.size() != c.p.size()) {
    LOG(2, "DEBUG: Mismatch in p's size: " << p.size() << " != " << c.p.size() << ".");
    return false;
  }
  std::vector<scafacos::configuration::particle>::const_iterator iter = p.begin();
  std::vector<scafacos::configuration::particle>::const_iterator citer = c.p.begin();
  for (;iter != p.end(); ++iter, ++citer) {
    if ((*iter) != (*citer))
      return false;
  }
  return true;
}

bool FormatParser< xml >::scafacos::operator==(const scafacos &s) const {
  comparator(name, s.name)
  comparator(description, s.description)
  comparator(reference_method, s.reference_method)
  num_comparator(error_potential, s.error_potential)
  num_comparator(error_field, s.error_field)

  if (config != s.config) {
    return false;
  }
  return true;
}