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/*
    visualsc - Visual State Chart Editing for SCXML State Engines
    Copyright (C) 2011  David W. Drell (david@davidwdrell.net) and
    Contributing Authors:


    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef SCDATAMODEL_H
#define SCDATAMODEL_H

#include "scdatamodel_global.h"
#include "sctransition.h"
#include "scstate.h"
#include <QList>
#include "scxmlreader.h"
#include <QXmlStreamWriter>
class QGraphicsScene;

class SCDATAMODELSHARED_EXPORT SCDataModel : public QObject
{
      Q_OBJECT


public:
    static SCDataModel * singleton();

    // direct interface
    void open(QString scxmlFile);

    bool save(QString scxmlFile, QString & message);
    void initializeEmptyStateMachine();

    void getStates(QList<SCState *>& list);
    void getAllStates(QList<SCState *>& list);
    SCState* getStateByName(QString name);
    SCTransition * getTransitionByName(QString name);
    QObject * getItemByName(QString name);
    SCState* getTopState( );
    void setScene(QGraphicsScene *scene);
    QGraphicsScene * getScene();

    static SCState *getAsState(QObject*);
    static SCTransition *getAsTransition(QObject*);
    static TextBlock *getAsTextBlock(QObject*);

    SCState* insertNewState(SCState *parent);

    SCTransition* insertNewTransition(SCState *source, QString event );

    void logError(QString message);
    void logInfo(QString message);


signals:
    void openCompleted(bool sucess, QStringList message);
    void newStateSignal(SCState * newState);
    void newTransitionSignal(SCTransition * newTransition);

private slots:
    void handleReaderDone(bool sucess, QStringList message);
    void handleMakeANewState(StateAttributes*);
    void handleMakeANewTransition(TransitionAttributes*);
    void handleLeaveTransitionElement();
    void handleMakeANewTransitionPath(QString path);
    void handleTransitUp();
    void handleTransitDown();
    void handleMakeANewIDTextBlock(TextBlockAttributes *attributes);

private:
    SCXMLReader     _reader;
    QXmlStreamWriter *_writer;
    int              _level;
    int              _topLevel;
    SCState         *_currentState;
    SCTransition    *_currentTransition;
    SCState         *_topState;
    QGraphicsScene * _scene;


//private methods
    SCDataModel(QObject * parent=NULL);

};

#endif // SCDATAMODEL_H