/*
 * Project: MoleCuilder
 * Description: creates and alters molecular systems
 * Copyright (C)  2010 University of Bonn. All rights reserved.
 * Please see the LICENSE file or "Copyright notice" in builder.cpp for details.
 */

/** \file periodentafel.cpp
 *
 * Function implementations for the class periodentafel.
 *
 */

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

#include "Helpers/MemDebug.hpp"

#include <iomanip>
#include <iostream>
#include <fstream>
#include <cstring>

#include "Helpers/Assert.hpp"
#include "element.hpp"
#include "elements_db.hpp"
#include "Helpers/helpers.hpp"
#include "lists.hpp"
#include "Helpers/Log.hpp"
#include "periodentafel.hpp"
#include "Helpers/Verbose.hpp"

using namespace std;

/************************************* Functions for class periodentafel ***************************/

/** constructor for class periodentafel
 * Initialises start and end of list and resets periodentafel::checkliste to false.
 */
periodentafel::periodentafel()
{
  {
    stringstream input(elementsDB,ios_base::in);
    bool status = LoadElementsDatabase(input);
    ASSERT(status,  "General element initialization failed");
  }
  {
    stringstream input(valenceDB,ios_base::in);
    bool status = LoadValenceDatabase(&input);
    ASSERT(status, "Valence entry of element initialization failed");
  }
  {
    stringstream input(orbitalsDB,ios_base::in);
    bool status = LoadOrbitalsDatabase(&input);
    ASSERT(status, "Orbitals entry of element initialization failed");
  }
  {
    stringstream input(HbondangleDB,ios_base::in);
    bool status = LoadHBondAngleDatabase(&input);
    ASSERT(status, "HBond angle entry of element initialization failed");
  }
  {
    stringstream input(HbonddistanceDB,ios_base::in);
    bool status = LoadHBondLengthsDatabase(&input);
    ASSERT(status, "HBond distance entry of element initialization failed");
  }
};

/** destructor for class periodentafel
 * Removes every element and afterwards deletes start and end of list.
 * TODO: Handle when elements have changed and store databases then
 */
periodentafel::~periodentafel()
{
  CleanupPeriodtable();
};

/** Adds element to period table list
 * \param *pointer element to be added
 * \return iterator to added element
 */
periodentafel::iterator periodentafel::AddElement(element * pointer)
{
  atomicNumber_t Z = pointer->getNumber();
  ASSERT(!elements.count(Z), "Element is already present.");
  if (pointer->getNumber() < 1 && pointer->getNumber() >= MAX_ELEMENTS)
    DoeLog(0) && (eLog() << Verbose(0) << "Invalid Z number!\n");
  pair<iterator,bool> res = elements.insert(pair<atomicNumber_t,element*>(Z,pointer));
  return res.first;
};

/** Removes element from list.
 * \param *pointer element to be removed
 */
size_t periodentafel::RemoveElement(const element * pointer)
{
  return RemoveElement(pointer->getNumber());
};

/** Removes element from list.
 * \param Z element to be removed
 */
size_t periodentafel::RemoveElement(atomicNumber_t Z)
{
  return elements.erase(Z);
};

/** Removes every element from the period table.
 */
void periodentafel::CleanupPeriodtable()
{
  for(iterator iter=elements.begin();iter!=elements.end();++iter){
    delete(*iter).second;
  }
  elements.clear();
};

/** Finds an element by its atomic number.
 * If element is not yet in list, returns NULL.
 * \param Z atomic number
 * \return pointer to element or NULL if not found
 */
const element * periodentafel::FindElement(atomicNumber_t Z) const
{
  const_iterator res = elements.find(Z);
  return res!=elements.end()?((*res).second):0;
};

/** Finds an element by its atomic number.
 * If element is not yet in list, datas are asked and stored in database.
 * \param shorthand chemical symbol of the element, e.g. H for hydrogene
 * \return pointer to element
 */
const element * periodentafel::FindElement(const string &shorthand) const
{
  element *res = 0;
  for(const_iterator iter=elements.begin();iter!=elements.end();++iter) {
    if((*iter).second->getSymbol() == shorthand){
      res = (*iter).second;
      break;
    }
  }
  return res;
};

/** Asks for element number and returns pointer to element
 * \return desired element or NULL
 */
const element * periodentafel::AskElement() const
{
  const element * walker = NULL;
  int Z;
  do {
    DoLog(0) && (Log() << Verbose(0) << "Atomic number Z: ");
    cin >> Z;
    walker = this->FindElement(Z);  // give type
  } while (walker == NULL);
  return walker;
};

/** Asks for element and if not found, presents mask to enter info.
 * \return pointer to either present or newly created element
 */
const element * periodentafel::EnterElement()
{
  atomicNumber_t Z = 0;
  DoLog(0) && (Log() << Verbose(0) << "Atomic number: " << Z << endl);
  cin >> Z;
  const element *res = FindElement(Z);
  if (!res) {
    // TODO: make this using the constructor
    DoLog(0) && (Log() << Verbose(0) << "Element not found in database, please enter." << endl);
    element *tmp = new element;
    tmp->Z = Z;
    DoLog(0) && (Log() << Verbose(0) << "Mass: " << endl);
    cin >> tmp->mass;
    DoLog(0) && (Log() << Verbose(0) << "Name [max 64 chars]: " << endl);
    cin >> tmp->getName();
    DoLog(0) && (Log() << Verbose(0) << "Short form [max 3 chars]: " << endl);
    cin >> tmp->getSymbol();
    AddElement(tmp);
    return tmp;
  }
  return res;
};


/******************** Access to iterators ****************************/
periodentafel::const_iterator periodentafel::begin() const{
  return elements.begin();
}

periodentafel::const_iterator periodentafel::end() const{
  return elements.end();
}

periodentafel::reverse_iterator periodentafel::rbegin() const{
  return reverse_iterator(elements.end());
}

periodentafel::reverse_iterator periodentafel::rend() const{
  return reverse_iterator(elements.begin());
}

/** Prints period table to given stream.
 * \param output stream
 */
bool periodentafel::Output(ostream * const output) const
{
  bool result = true;
  if (output != NULL) {
    for(const_iterator iter=elements.begin(); iter !=elements.end();++iter){
      result = result && (*iter).second->Output(output);
    }
    return result;
  } else
    return false;
};

/** Loads element list from file.
 * \param *path to to standard file names
 */
bool periodentafel::LoadPeriodentafel(const char *path)
{
  ifstream input;
  bool status = true;
  bool otherstatus = true;
  char filename[255];

  // fill elements DB
  strncpy(filename, path, MAXSTRINGSIZE);
  strncat(filename, "/", MAXSTRINGSIZE-strlen(filename));
  strncat(filename, STANDARDELEMENTSDB, MAXSTRINGSIZE-strlen(filename));
  input.open(filename);
  if (!input.fail())
    DoLog(0) && (Log() << Verbose(0) << "Using " << filename << " as elements database." << endl);
  status = status && LoadElementsDatabase(input);
  input.close();
  input.clear();

  // fill valence DB per element
  strncpy(filename, path, MAXSTRINGSIZE);
  strncat(filename, "/", MAXSTRINGSIZE-strlen(filename));
  strncat(filename, STANDARDVALENCEDB, MAXSTRINGSIZE-strlen(filename));
  input.open(filename);
  if (!input.fail())
    DoLog(0) && (Log() << Verbose(0) << "Using " << filename << " as valence database." << endl);
  otherstatus = otherstatus && LoadValenceDatabase(&input);
  input.close();
  input.clear();

  // fill orbitals DB per element
  strncpy(filename, path, MAXSTRINGSIZE);
  strncat(filename, "/", MAXSTRINGSIZE-strlen(filename));
  strncat(filename, STANDARDORBITALDB, MAXSTRINGSIZE-strlen(filename));
  input.open(filename);
  if (!input.fail())
    DoLog(0) && (Log() << Verbose(0) << "Using " << filename << " as orbitals database." << endl);
  otherstatus = otherstatus && LoadOrbitalsDatabase(&input);
  input.close();
  input.clear();

  // fill H-BondAngle DB per element
  strncpy(filename, path, MAXSTRINGSIZE);
  strncat(filename, "/", MAXSTRINGSIZE-strlen(filename));
  strncat(filename, STANDARDHBONDANGLEDB, MAXSTRINGSIZE-strlen(filename));
  input.open(filename);
  if (!input.fail())
    DoLog(0) && (Log() << Verbose(0) << "Using " << filename << " as H bond angle database." << endl);
  otherstatus = otherstatus && LoadHBondAngleDatabase(&input);
  input.close();
  input.clear();

  // fill H-BondDistance DB per element
  strncpy(filename, path, MAXSTRINGSIZE);
  strncat(filename, "/", MAXSTRINGSIZE-strlen(filename));
  strncat(filename, STANDARDHBONDDISTANCEDB, MAXSTRINGSIZE-strlen(filename));
  input.open(filename);
  if (!input.fail())
    DoLog(0) && (Log() << Verbose(0) << "Using " << filename << " as H bond length database." << endl);
  otherstatus = otherstatus && LoadHBondLengthsDatabase(&input);
  input.close();
  input.clear();

  if (!otherstatus){
    DoeLog(2) && (eLog()<< Verbose(2) << "Something went wrong while parsing the other databases!" << endl);
  }

  return status;
};

/** load the element info.
 * \param *input stream to parse from
 * \return true - parsing successful, false - something went wrong
 */
bool periodentafel::LoadElementsDatabase(istream &input)
{
  bool status = true;
  string header1tmp,header2tmp;
  // first parse into a map, so we can revert to old status in case something goes wront
  map<atomicNumber_t,element*> parsedElements;
  if (!input.fail()) {
    getline(input,header1tmp);
    getline(input,header2tmp); // skip first two header lines
    //cout << "First header: " << header1tmp << endl;
    //cout << "Second header: " << header2tmp << endl;
//    DoLog(0) && (Log() << Verbose(0) <<  "Parsed elements:");
    while (!input.eof()) {
      element *neues = new element;
      input >> neues->name;
      //(*input) >> ws;
      input >> neues->symbol;
      //(*input) >> ws;
      input >> neues->period;
      //(*input) >> ws;
      input >> neues->group;
      //(*input) >> ws;
      input >> neues->block;
      //(*input) >> ws;
      input >> neues->Z;
      //(*input) >> ws;
      input >> neues->mass;
      //(*input) >> ws;
      input >> neues->CovalentRadius;
      //(*input) >> ws;
      input >> neues->VanDerWaalsRadius;
      //(*input) >> ws;
      input >> ws;
      //neues->Output((ofstream *)&cout);
      if ((neues->getNumber() > 0) && (neues->getNumber() < MAX_ELEMENTS)) {
        parsedElements[neues->Z] = neues;
//        DoLog(0) && (Log() << Verbose(0) << " " << *neues);
      } else {
        DoeLog(2) && (eLog() << Verbose(2) << "Detected empty line or invalid element in elements db, discarding." << endl);
        DoLog(0) && (Log() << Verbose(0) << " <?>");
        delete(neues);
      }
      // when the input is in failed state, we most likely just read garbage
      if(input.fail()) {
        DoeLog(2) && (eLog() << Verbose(2) << "Error parsing elements db." << endl);
        status = false;
        break;
      }
    }
//    DoLog(0) && (Log() << Verbose(0) << endl);
  } else {
    DoeLog(1) && (eLog() << Verbose(1) << "Could not open the database." << endl);
    status = false;
  }

  if (!parsedElements.size())
    status = false;

  if(status){
    for(map<atomicNumber_t,element*>::iterator iter=parsedElements.begin();
                                               iter!=parsedElements.end();
                                               ++iter){
      if (elements.count(iter->first)) {
        // if element already present, replace the old one
        // pointer to old element might still be in use, so we have to replace into the old element
        *(elements[iter->first])=*iter->second;
        delete(iter->second);
      }
      else {
        // no such element in periodentafel... we can just insert
        elements[iter->first] = iter->second;
      }
    }
    // all went well.. we now copy the header
    strncpy(header1,header1tmp.c_str(),MAXSTRINGSIZE);
    header1[MAXSTRINGSIZE-1]=0;
    strncpy(header2,header2tmp.c_str(),MAXSTRINGSIZE);
    header2[MAXSTRINGSIZE-1]=0;
  }

  return status;
}

/** load the valence info.
 * \param *input stream to parse from
 * \return true - parsing successful, false - something went wrong
 */
bool periodentafel::LoadValenceDatabase(istream *input)
{
  char dummy[MAXSTRINGSIZE];
  if (!(*input).fail()) {
    (*input).getline(dummy, MAXSTRINGSIZE);
    while (!(*input).eof()) {
      atomicNumber_t Z;
      (*input) >> Z;
      ASSERT(elements.count(Z), "Element not present");
      (*input) >> ws;
      (*input) >> elements[Z]->Valence;
      (*input) >> ws;
      //Log() << Verbose(3) << "Element " << Z << " has " << FindElement(Z)->Valence << " valence electrons." << endl;
    }
    return true;
  } else
		return false;
}

/** load the orbitals info.
 * \param *input stream to parse from
 * \return true - parsing successful, false - something went wrong
 */
bool periodentafel::LoadOrbitalsDatabase(istream *input)
{
  char dummy[MAXSTRINGSIZE];
  if (!(*input).fail()) {
    (*input).getline(dummy, MAXSTRINGSIZE);
    while (!(*input).eof()) {
      atomicNumber_t Z;
      (*input) >> Z;
      ASSERT(elements.count(Z), "Element not present");
      (*input) >> ws;
      (*input) >> elements[Z]->NoValenceOrbitals;
      (*input) >> ws;
      //Log() << Verbose(3) << "Element " << Z << " has " << FindElement(Z)->NoValenceOrbitals << " number of singly occupied valence orbitals." << endl;
    }
    return true;
  } else
    return false;
}

/** load the hbond angles info.
 * \param *input stream to parse from
 * \return true - parsing successful, false - something went wrong
 */
bool periodentafel::LoadHBondAngleDatabase(istream *input)
{
  char dummy[MAXSTRINGSIZE];
  if (!(*input).fail()) {
    (*input).getline(dummy, MAXSTRINGSIZE);
    while (!(*input).eof()) {
      atomicNumber_t Z;
      (*input) >> Z;
      ASSERT(elements.count(Z), "Element not present");
      (*input) >> ws;
      (*input) >> elements[Z]->HBondAngle[0];
      (*input) >> elements[Z]->HBondAngle[1];
      (*input) >> elements[Z]->HBondAngle[2];
      (*input) >> ws;
      //Log() << Verbose(3) << "Element " << (int)tmp << " has " << FindElement((int)tmp)->HBondAngle[0] << ", " << FindElement((int)tmp)->HBondAngle[1] << ", " << FindElement((int)tmp)->HBondAngle[2] << " degrees bond angle for one, two, three connected hydrogens." << endl;
    }
    return true;
  } else
		return false;
}

/** load the hbond lengths info.
 * \param *input stream to parse from
 * \return true - parsing successful, false - something went wrong
 */
bool periodentafel::LoadHBondLengthsDatabase(istream *input)
{
  char dummy[MAXSTRINGSIZE];
  if (!(*input).fail()) {
    (*input).getline(dummy, MAXSTRINGSIZE);
    while (!(*input).eof()) {
      atomicNumber_t Z;
      (*input) >> Z;
      ASSERT(elements.count(Z), "Element not present");
      (*input) >> ws;
      (*input) >> elements[Z]->HBondDistance[0];
      (*input) >> elements[Z]->HBondDistance[1];
      (*input) >> elements[Z]->HBondDistance[2];
      (*input) >> ws;
      //Log() << Verbose(3) << "Element " << (int)tmp << " has " << FindElement((int)tmp)->HBondDistance[0] << " Angstrom typical distance to hydrogen." << endl;
    }
    return true;
  } else
		return false;
}

/** Stores element list to file.
 */
bool periodentafel::StorePeriodentafel(const char *path) const
{
  bool result = true;
  ofstream f;
  char filename[MAXSTRINGSIZE];

  strncpy(filename, path, MAXSTRINGSIZE);
  strncat(filename, "/", MAXSTRINGSIZE-strlen(filename));
  strncat(filename, STANDARDELEMENTSDB, MAXSTRINGSIZE-strlen(filename));
  f.open(filename);
  if (f != NULL) {
    f << header1 << endl;
    f << header2 << endl;
    for(const_iterator iter=elements.begin();iter!=elements.end();++iter){
         result = result && (*iter).second->Output(&f);
    }
    f.close();
    return true;
  } else
    return result;
};