/*
 * QtObservedMolecule.hpp
 *
 *  Created on: Oct 28, 2015
 *      Author: heber
 */


#ifndef QTOBSERVEDMOLECULE_HPP_
#define QTOBSERVEDMOLECULE_HPP_

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

#include <QtGui/QWidget>

#include <boost/function.hpp>
#include <boost/shared_ptr.hpp>

#include "CodePatterns/Observer/Observable.hpp"
#include "CodePatterns/Observer/Observer.hpp"

#include "LinearAlgebra/Vector.hpp"

#include "molecule.hpp"
#include "UIElements/Qt4/InstanceBoard/ObservedValue_types.hpp"
#include "UIElements/Qt4/InstanceBoard/ObservedValuesContainer.hpp"
#include "UIElements/Qt4/InstanceBoard/QtObservedAtom.hpp"
#include "types.hpp"

class QtObservedInstanceBoard;

/** This instance is the ObservedValue representation of a World's molecule.
 *
 * Due to the signal/slot mechanism and its delays, lifetime of objects in the
 * World and their QtGui representation cannot directly be related (without
 * slowing down Actions just for having the representation up to speed).
 * Hence, the required information for displaying and representing these
 * objects must be contained in an extra instance.
 *
 * This is the instance for information about a particular molecule.
 */
class QtObservedMolecule : public QWidget, public Observer
{
  Q_OBJECT

public:

  //!> typedef for instance wrapped in shared ptr
  typedef boost::shared_ptr<QtObservedMolecule> ptr;

  //!> typedef for instance wrapped in shared ptr
  typedef boost::weak_ptr<QtObservedMolecule> weak_ptr;

private:
  //!> ObservedValuesContainer needs to access private cstor and dstor
  friend class ObservedValuesContainer<QtObservedMolecule, ObservedValue_Index_t>;
  //!> QtObservedInstanceBoard needs to access private cstor and dstor
  friend class QtObservedInstanceBoard;

  /** Cstor of QtObservedMolecule.
   *
   * \param _id id of observed molecule
   * \param _mol ref to observed molecule
   * \param _board ref to InstanceBoard for callbacks on occasion of subjectKilled()
   * \param _parent Qt parent to automatically destroy when parent is destroyed
   */
  QtObservedMolecule(
      const moleculeId_t _id,
      const molecule * const _mol,
      QtObservedInstanceBoard &_board,
      QWidget * _parent=0);

public:

  /** Dstor of QtObservedMolecule.
   *
   */
  ~QtObservedMolecule();

  // Observer functions
  void update(Observable *publisher);
  void subjectKilled(Observable *publisher);
  void recieveNotification(Observable *publisher, Notification_ptr notification);

  /** Getter for a permanent and unique index of this instance.
   *
   * \note ALWAYS use this index if you need to store and identifier to this
   * instance which you might need to retrieve at some later date.
   *
   * \warning DO NOT STORE the QtObserved...:ptr directly. This will possibly
   * prevent their eventual destruction. Only store the ObservedValue_Index_t
   * as means to obtain the ptr from the QtObservedInstanceBoard.
   *
   * \return returns a unique and permanent index that can be used to retrieve this
   * instance from the QtObservedInstanceBoard as it must not be stored.
   */
  ObservedValue_Index_t getIndex() const;

  /** Getter to molecule atom count contained in \a ObservedValues.
   *
   * \return molecule's atom count
   */
  const int& getAtomCount() const;

  /** Getter to molecule bond count contained in \a ObservedValues.
   *
   * \return molecule's bond count
   */
  const int& getBondCount() const;

  /** Getter to molecule center contained in \a ObservedValues.
   *
   * \return molecule's center
   */
  const Vector& getMolCenter() const;

  /** Getter to molecule index contained in \a ObservedValues.
   *
   * \return molecule's index
   */
  const moleculeId_t& getMolIndex() const;

  /** Getter to molecule name contained in \a ObservedValues.
   *
   * \return molecule's name
   */
  const std::string& getMolName() const;

  /** Getter to molecule formula contained in \a ObservedValues.
   *
   * \return molecule's formula
   */
  const std::string& getMolFormula() const;

  /** Getter to molecule non-hydrogen atom  count contained in \a ObservedValues.
   *
   * \return molecule's non-hydrogen atom count
   */
  const int& getNonHydrogenCount() const;

  /** Getter to molecule's bounding box contained in \a ObservedValues.
   *
   * \return molecule's bounding box
   */
  const molecule::BoundingBoxInfo& getBoundingBox() const;

  /** Getter to molecule's selected status.
   *
   * \return true - molecule selected, false - else
   */
  const bool& getMolSelected() const;

  static const molecule * const getMolecule(const moleculeId_t _id);

signals:
  void atomcountChanged();
  void bondcountChanged();
  void formulaChanged();
  void indexChanged(const moleculeId_t, const moleculeId_t);
  void nameChanged();
  void nononhydrogenChanged();
  void centerChanged();
  void tesselationhullChanged();
  void boundingboxChanged();
  void atomInserted(QtObservedAtom::ptr, QtObservedMolecule *);
  void atomRemoved(ObservedValue_Index_t, QtObservedMolecule *);
  void moleculeRemoved();
  void selectedChanged();

private:

  void activateObserver();
  void deactivateObserver();

private:
  static int updateAtomCount(const molecule &mol);
  static int updateBondCount(const molecule &mol);
  static molecule::BoundingBoxInfo updateBoundingBox(const molecule &mol);
  static std::string updateFormulaString(const molecule &mol);
  static Vector updateCenter(const molecule &mol);
  static moleculeId_t updateIndex(const molecule &mol);
  static std::string updateName(const molecule &mol);
  static int updateNonHydrogenCount(const molecule &mol);
  static bool updateSelected(const molecule &mol);

  //!> list of channels when atom count needs to update
  static const Observable::channels_t AtomCountChannels;
  //!> list of channels when bond count needs to update
  static const Observable::channels_t BondCountChannels;
  //!> list of channels when bounding box needs to update
  static const Observable::channels_t BoundingBoxChannels;
  //!> list of channels when formula needs to update
  static const Observable::channels_t FormulaStringChannels;
  //!> list of channels when the center needs to update
  static const Observable::channels_t CenterChannels;
  //!> list of channels when the index needs to update
  static const Observable::channels_t IndexChannels;
  //!> list of channels when the name needs to update
  static const Observable::channels_t NameChannels;
  //!> list of channels when the name needs to update
  static const Observable::channels_t NonHydrogenCountChannels;
  //!> list of channels when the name needs to update
  static const Observable::channels_t SelectedChannels;

private:
  /** Observed Values **/

  //!> enumeration of observed values to match with entries in ObservedValues
  enum ObservedTypes {
    //!> contains the current molecule index
    MolIndex,
    //!> contains the current molecule's atom count
    AtomCount,
    //!> contains the current molecule's number of bonds
    BondCount,
    //!> contains newest version of the bounding box on request
    BoundingBox,
    //!> contains the current molecule's formula
    FormulaString,
    //!> contains the current molecule's center
    MolCenter,
    //!> contains the current molecule name
    MolName,
    //!> contains the current molecule's non-hydrogen atom count
    NonHydrogenCount,
    //!> contains the current molecule's selection status
    MolSelected,
    //!> gives the size of the enumeration
    MAX_ObservedTypes
  };

  /** Initializes all \a _ObservedValues entries.
   *
   * \param _ObservedValues vector of ObservedValue to be filled
   * \param _moid molecule id
   * \param _molref reference to molecule
   * \param _subjectKilled ref to function to call on subjectKilled()
   */
  void initObservedValues(
      ObservedValues_t &_ObservedValues,
      const moleculeId_t _molid,
      const molecule * const _molref,
      const boost::function<void()> &_subjectKilled);

  /** Destroys all \a ObservedValues entries.
   *
   * \param _ObservedValues vector of ObservedValue to be destroyed
   */
  void destroyObservedValues(
      std::vector<boost::any> &_ObservedValues);

  /** Function is called by InstanceBoard to inform about its destruction.
   *
   * \note callbacks must not be used after this
   */
  void noteBoardIsGone()
  { BoardIsGone = true; }


  /** Counts the number of subject killed received from the observed values.
   *
   * \param _id id to check against ours
   */
  void countValuesSubjectKilled(ObservedValue_Index_t _id);

  //!> counts how many ObservedValues have already been subjectKilled()
  mutable size_t subjectKilledCount;

  /** Helper function to check that all subjectKilled have been received for both
   * this instance and all its internal observed values.
   *
   * \param _id id to check against ours
   */
  void checkForRemoval(ObservedValue_Index_t _id);

private:

  //!> we get multiple subjectKilled(), count and call callback() only on last
  const unsigned int AllsignedOnChannels;
  unsigned int signedOffChannels;

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

private:

  /** Internal setter for the weak shared_ptr instance that we sometimes
   * need to convert the ref to this instance into an shared ptr instance that
   * is safe to hand around.
   *
   * \param _selfref ref to shared ptr instance that is internally stored
   */
  void setSelfRef(const weak_ptr &_selfref)
  { const_cast<weak_ptr &>(selfref) = _selfref; }

  //!> reference to this instance wrapped in a shared ptr for handing around
  const weak_ptr selfref;

public:

  /** Getter for this instance safely wrapped in a shared ptr instance for
   * handing arount.
   *
   * \return shared ptr of this instance
   */
  ptr getRef() const
  { return ptr(selfref); }

private:
  //!> contains still the old index after the index changed
  moleculeId_t oldId;

  //!> reference to InstanceBoard for callbacks on subjectKilled()
  QtObservedInstanceBoard & board;

  //!> is board still alive or not, impacts callbacks
  bool BoardIsGone;

  //!> internal reference to ObservedValues held by QtObservedInstanceBoard
  ObservedValues_t ObservedValues;
};


#endif /* QTOBSERVEDMOLECULE_HPP_ */