/*
 * QtMoleculeItem.hpp
 *
 *  Created on: Jan 17, 2015
 *      Author: heber
 */

#ifndef QTMOLECULEITEM_HPP_
#define QTMOLECULEITEM_HPP_

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

#include <QList>
#include <QStandardItem>

#include "CodePatterns/Observer/Observer.hpp"

#include <boost/function.hpp>
#include <boost/thread/recursive_mutex.hpp>
#include <list>
#include <string>

#include "molecule.hpp"

/** This class describes the general interface for a specific item in a QtAbstractItemModel
 * to contain a specific piece of information about a specific molecule.
 *
 * To this end, we need a ref to the molecule for updating the information when
 * necessary and we need to know the channels we have to listen to know when an
 * update is necessary.
 *
 * This class takes care of of all the rest:
 * -# informing QtMoleculeList about required update ("dirty")
 * -# relaying updateState() call from QtMoleculeList to the specific internal_updateState()
 */
class QtMoleculeItem : public QStandardItem, public Observer
{
public:
  //!> typedef for a list of notification channels required, to know when to update
  typedef Observable::channels_t channellist_t;

  //!> enum states whether an item's formula changed or not
  enum MoveTypes {
    NeedsMove,
    DoesNotMove
  };

  //!> enumerates all different item types, coinciding with column in QtMoleculeList
  enum COLUMNTYPES {NAME,VISIBILITY,ATOMCOUNT,FORMULA,OCCURRENCE,COLUMNTYPES_MAX};

  //!> typedef for callback function to model to inform when we need update
  typedef const boost::function<void (
      const moleculeId_t _id,
      const QtMoleculeItem::COLUMNTYPES _type,
      const enum MoveTypes)> emitDirtyState_t;

  //!> typedef for callback function to model to inform when our subjectKilled() was called
  typedef const boost::function<void (const moleculeId_t _id)> emitSubjectKilledState_t;

  QtMoleculeItem(
      const moleculeId_t _molid,
      const channellist_t &_channellist,
      const enum MoveTypes _movetype,
      const emitDirtyState_t _emitDirtyState,
      const emitSubjectKilledState_t _emitSubjectKilledState);
  virtual ~QtMoleculeItem();

  /** Update the state of this item.
   *
   */
  void updateState();

  /** Const getter to this item's molecule.
   *
   * \return const ref to \a mol
   */
  const molecule * const getMolecule() const;

  /** Getter for the id of the molecule this item is associated to
   *
   * \return id of molecule
   */
  moleculeId_t getMoleculeId() const
  { return molid; }

  /** Returns the type of this QtMoleculeItem, i.e. the column in QtMoleculeList.
   *
   * @return type of this item
   */
  virtual QtMoleculeItem::COLUMNTYPES getType() const = 0;

private:
  void update(Observable *publisher);
  void recieveNotification(Observable *publisher, Notification_ptr notification);
  void subjectKilled(Observable *publisher);

protected:
  void signOnToMolecule();
  void signOffFromMolecule();

protected:
  /** This function needs to be implemented to make the specific update.
   *
   */
  virtual void internal_updateState() = 0;

  //!> molecule we are signed on to
  const moleculeId_t molid;

private:
  //!> move type for this specific item, set this when implementing
  const enum MoveTypes movetype;

  //!> ref to the specific static list of channels we are signed on to
  const channellist_t &channellist;

  //!> the Observable we are signed on, also indicates whether we are sign on (not NULL)
  const Observable * owner;

  //!> states that this item needs to be updated
  bool dirty;

  //!> bound callback function to inform model about change
  const emitDirtyState_t emitDirtyState;

  //!> bound callback function to inform model about change
  const emitSubjectKilledState_t emitSubjectKilledState;

  //!> this protects the signing on and off
  mutable boost::recursive_mutex owner_mutex;
};


#endif /* QTMOLECULEITEM_HPP_ */