/*
 * World.hpp
 *
 *  Created on: Feb 3, 2010
 *      Author: crueger
 */

#ifndef WORLD_HPP_
#define WORLD_HPP_

#include <string>
#include <map>
#include <vector>
#include <set>
#include <boost/thread.hpp>
#include <boost/shared_ptr.hpp>


#include "Patterns/Observer.hpp"
#include "Patterns/Cacheable.hpp"

// forward declarations
class periodentafel;
class MoleculeListClass;
class atom;
class molecule;
class AtomDescriptor;
class AtomDescriptor_impl;
class ManipulateAtomsProcess;
template<typename T>
class AtomsCalculation;

class World : public Observable
{
// necessary for coupling with descriptors
friend class AtomDescriptor_impl;
friend class AtomDescriptor;

// Actions, calculations etc associated with the World
friend class ManipulateAtomsProcess;
template<typename> friend class AtomsCalculation;

typedef std::map<int,atom*> AtomList;
public:

  /***** getter and setter *****/
  // reference to pointer is used for legacy reason... reference will be removed latter to keep encapsulation of World object
  periodentafel *&getPeriode();
  atom* getAtom(AtomDescriptor descriptor);
  std::vector<atom*> getAllAtoms(AtomDescriptor descriptor);

  template<typename T>
  AtomsCalculation<T>* calcOnAtoms(boost::function<T(atom*)>,std::string,AtomDescriptor);

  int numAtoms();
  int numMolecules();

  /***** Methods to work with the World *****/
  molecule *createMolecule();
  atom *createAtom();
  int registerAtom(atom*);
  void destroyAtom(atom*);
  void destroyAtom(int);

  ManipulateAtomsProcess* manipulateAtoms(boost::function<void(atom*)>,std::string,AtomDescriptor);

protected:
  /**** Iterators to use internal data structures */
  class AtomIterator {
  public:
    AtomIterator();
    AtomIterator(AtomDescriptor, World*);
    AtomIterator(const AtomIterator&);
    AtomIterator& operator=(const AtomIterator&);
    AtomIterator& operator++();     // prefix
    AtomIterator  operator++(int);  // postfix with dummy parameter
    bool operator==(const AtomIterator&);
    bool operator==(const AtomList::iterator&);
    bool operator!=(const AtomIterator&);
    bool operator!=(const AtomList::iterator&);
    atom* operator*();

    int getCount();
  protected:
    void advanceState();
    World* world;
    AtomList::iterator state;
    boost::shared_ptr<AtomDescriptor_impl>  descr;
    int index;
  };

  AtomIterator getAtomIter(AtomDescriptor descr);
  AtomList::iterator atomEnd();

  /******* Internal manipulation routines for double callback and Observer mechanism ******/
  void doManipulate(ManipulateAtomsProcess *);

private:
  periodentafel *periode;
  AtomList atoms;
  int currAtomId; //!< stores the next available Id for atoms
  std::set<molecule*> molecules;


  /***** singleton Stuff *****/
public:
  static World* get();
  static void destroy();
  static World* reset();

private:
  World();
  virtual ~World();

  static World *theWorld;
  // this mutex only saves the singleton pattern...
  // use other mutexes to protect internal data as well
  // this mutex handles access to the pointer, not to the object!!!
  static boost::mutex worldLock;

  /*****
   * some legacy stuff that is include for now but will be removed later
   *****/
public:
  MoleculeListClass *&getMolecules();

private:
  MoleculeListClass *molecules_deprecated;
};

#endif /* WORLD_HPP_ */