/*
 * ValueStorage.hpp
 *
 *  Created on: Jul 22, 2010
 *      Author: heber
 */

#ifndef VALUESTORAGE_HPP_
#define VALUESTORAGE_HPP_

#include <boost/filesystem.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/program_options.hpp>

#include <map>
#include <set>
#include <vector>
#include <typeinfo>

#include "Actions/OptionTrait.hpp"
#include "Actions/OptionRegistry.hpp"
#include "Exceptions/IllegalTypeException.hpp"
#include "Exceptions/MissingValueException.hpp"
#include "Helpers/Assert.hpp"
#include "Patterns/Singleton.hpp"

class MapOfActionsTest;

class Box;
class atom;
class element;
class molecule;
class Vector;

namespace po = boost::program_options;

using boost::lexical_cast;

#include "Patterns/Singleton.hpp"

/** ValueStorage serves as a mediator to MapOfActions.
 * This is needed to relax inter-dependencies between the Queries and the Actions.
 * I.e. this is the interface implemented in MapOfActions which both can safely rely on
 * to store&retrieve/exchange values.
 */
class ValueStorage : public Singleton<ValueStorage> {
  friend class Singleton<ValueStorage>;

public:

  bool isCurrentValuePresent(const char *name) const;
  void queryCurrentValue(const char * name, const atom * &_T);
  void queryCurrentValue(const char * name, const element * &_T);
  void queryCurrentValue(const char * name, const molecule * &_T);
  void queryCurrentValue(const char * name, class Box &_T);
  void queryCurrentValue(const char * name, class Vector &_T);
  void queryCurrentValue(const char * name, class BoxVector &_T);
  void queryCurrentValue(const char * name, std::vector<const atom *>&_T);
  void queryCurrentValue(const char * name, std::vector<const element *>&_T);
  void queryCurrentValue(const char * name, std::vector<const molecule *>&_T);
  void queryCurrentValue(const char * name, boost::filesystem::path&_T);

  /** Gets a value from the storage
   * If the value is not present, an ASSERT is thrown unless optional is set to true.
   * \param _T key of value
   * \param optional whether this value is optional, i.e. may actually not be in the storage (i.e. may return false in this case).
   * \return true - value present, false - value not present (only given when optional set to true)
   */
  template<typename T> void queryCurrentValue(const char * name, T &_T)
  {
    if (typeid( T ) == *(OptionRegistry_instance.getOptionByName(name)->getType())) { // constructor of type_info is private, hence can only store by ref or ptr
      if (CurrentValueMap.find(name) == CurrentValueMap.end())
        throw MissingValueException(__FILE__, __LINE__);
      _T = lexical_cast<T>(CurrentValueMap[name].c_str());
      CurrentValueMap.erase(name);
    } else
      throw IllegalTypeException(__FILE__,__LINE__);
  }
  template<typename T> void queryCurrentValue(const char * name, std::vector<T> &_T)
  {
    T temp;
    if (typeid( std::vector<T> ) == *(OptionRegistry_instance.getOptionByName(name)->getType())) { // constructor of type_info is private, hence can only store by ref or ptr
      if (CurrentValueMap.find(name) == CurrentValueMap.end())
        throw MissingValueException(__FILE__, __LINE__);
      std::istringstream stream(CurrentValueMap[name]);
      CurrentValueMap.erase(name);
      while (!stream.fail()) {
        stream >> temp >> std::ws;
        _T.push_back(temp);
      }
    } else
      throw IllegalTypeException(__FILE__,__LINE__);
  }

  void setCurrentValue(const char * name, const atom * &_T);
  void setCurrentValue(const char * name, const element * &_T);
  void setCurrentValue(const char * name, const molecule * &_T);
  void setCurrentValue(const char * name, class Box &_T);
  void setCurrentValue(const char * name, class Vector &_T);
  void setCurrentValue(const char * name, std::vector<const atom *>&_T);
  void setCurrentValue(const char * name, std::vector<const element *>&_T);
  void setCurrentValue(const char * name, std::vector<const molecule *>&_T);
  void setCurrentValue(const char * name, boost::filesystem::path&_T);

  /** Sets a value in the storage.
   * \param name key of value
   * \param _T value
   */
  template<class T> void setCurrentValue(const char * name, T &_T)
  {
    std::ostringstream stream;
    if (typeid( T ) == *(OptionRegistry_instance.getOptionByName(name)->getType())) {  // constructor of type_info is private, hence can only store by ref or ptr
      stream << _T;
      CurrentValueMap[name] = stream.str();
    } else
      throw IllegalTypeException(__FILE__,__LINE__);
  }
  /** Sets a value in the storage.
   * \param name key of value
   * \param _T value
   */
  template<class T> void setCurrentValue(const char * name, std::vector<T> &_T)
  {
    std::ostringstream stream;
    if (typeid( std::vector<T> ) == *(OptionRegistry_instance.getOptionByName(name)->getType())) {  // constructor of type_info is private, hence can only store by ref or ptr
      std::ostringstream stream;
      for (typename std::vector<T>::const_iterator iter = _T.begin(); iter != _T.end(); ++iter) {
        stream << (*iter) << " ";
      }
      CurrentValueMap[name] = stream.str();
    } else
      throw IllegalTypeException(__FILE__,__LINE__);
  }

  const std::string getCurrentValue(std::string actionname);

protected:
  ValueStorage();
  ~ValueStorage();

  std::map<std::string, std::string> CurrentValueMap;

  OptionRegistry &OptionRegistry_instance;
};

#endif /* VALUESTORAGE_HPP_ */