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// qtractorEngine.h
   Copyright (C) 2005-2007, rncbc aka Rui Nuno Capela. All rights reserved.

   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 2
   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
   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, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


#ifndef __qtractorEngine_h
#define __qtractorEngine_h

#include "qtractorSession.h"

#include <QList>

// Forward declarations.
class qtractorBus;
class qtractorSessionCursor;
class qtractorSessionDocument;
class qtractorMonitor;

class QDomElement;

// class qtractorEngine -- Abstract device engine instance (singleton).

class qtractorEngine

      // Constructor.
      qtractorEngine(qtractorSession *pSession,
            qtractorTrack::TrackType syncType);
      // Destructor.
      virtual ~qtractorEngine();

      // Device engine activation methods.
      bool open(const QString& sClientName);
      void close();

      // Buses list clear.
      void clear();

      // Session helper accessor.
      qtractorSession *session() const;

      // Session cursor accessor.
      qtractorSessionCursor *sessionCursor() const;

      // Engine type method.
      qtractorTrack::TrackType syncType() const;

      // Client name accessor.
      const QString& clientName() const;

      // Engine status methods.
      bool isActivated() const;

      // Engine state methods.
      void setPlaying(bool bPlaying);
      bool isPlaying() const;

      // Buses list managament methods.
      const qtractorList<qtractorBus>& buses() const;

      void addBus(qtractorBus *pBus);
      void removeBus(qtractorBus *pBus);

      qtractorBus *findBus(const QString& sBusName);

      // Retrieve/restore all connections, on all buses;
      // return the effective number of connection attempts.
      int updateConnects();

      // Document element methods.
      virtual bool loadElement(qtractorSessionDocument *pDocument,
            QDomElement *pElement) = 0;
      virtual bool saveElement(qtractorSessionDocument *pDocument,
            QDomElement *pElement) = 0;


      // Derived classes must set on this...
      virtual bool init(const QString& sClientName) = 0;
      virtual bool activate() = 0;
      virtual bool start() = 0;
      virtual void stop() = 0;
      virtual void deactivate() = 0;
      virtual void clean() = 0;


      // Device instance variables.
      qtractorSession       *m_pSession;
      qtractorSessionCursor *m_pSessionCursor;

      QString m_sClientName;

      // Engine running flags.
      bool m_bActivated;
      bool m_bPlaying;

      qtractorList<qtractorBus> m_buses;

// class qtractorBus -- Abstract device bus.

class qtractorBus : public qtractorList<qtractorBus>::Link

      // Bus operation mode bit-flags.
      enum BusMode { None = 0, Input = 1, Output = 2, Duplex = 3 };

      // Constructor.
      qtractorBus(qtractorEngine *pEngine,
            const QString& sBusName, BusMode busMode = Duplex);
      // Destructor.
      virtual ~qtractorBus();

      // Device accessor.
      qtractorEngine *engine() const;

      // Bus type method.
      qtractorTrack::TrackType busType() const;

      // Bus name accessors.
      void setBusName(const QString& sBusName);
      const QString& busName() const;

      // Bus mode property accessor.
      void setBusMode(BusMode busMode);
      BusMode busMode() const;

      // Pure virtual activation methods.
      virtual bool open() = 0;
      virtual void close() = 0;

      // I/O bus-monitor accessors.
      virtual qtractorMonitor *monitor_in()  const = 0;
      virtual qtractorMonitor *monitor_out() const = 0;

      // Connection list stuff.
      struct ConnectItem
            unsigned short index;
            QString clientName;
            QString portName;

      class ConnectList : public QList<ConnectItem *>
            // Constructor
            ConnectList() {}
            // Destructor.
            ~ConnectList() { qDeleteAll(*this); }
            // Item finder...
            ConnectItem *findItem(const ConnectItem& item)
                  QListIterator<ConnectItem *> iter(*this);
                  while (iter.hasNext()) {
                        ConnectItem *pItem = iter.next();
                        if (pItem->index      == item.index &&
                              pItem->clientName == item.clientName &&
                              pItem->portName   == item.portName) 
                              return pItem;
                  return NULL;

      // Connection lists accessors.
      ConnectList& inputs()  { return m_inputs;  }
      ConnectList& outputs() { return m_outputs; }
      // Retrieve/restore client:port connections;
      // return the effective number of connection attempts.
      virtual int updateConnects(BusMode busMode,
            ConnectList& connects, bool bConnect = false) = 0;

      // Document element methods.
      bool loadConnects(ConnectList& connects,
            qtractorSessionDocument *pDocument, QDomElement *pElement);
      bool saveConnects(ConnectList& connects,
            qtractorSessionDocument *pDocument, QDomElement *pElement);


      // Bus mode change event.
      virtual void updateBusMode() = 0;


      // Instance variables.
      qtractorEngine *m_pEngine;

      QString m_sBusName;
      BusMode m_busMode;
      // Connections stuff.
      ConnectList m_inputs;
      ConnectList m_outputs;

#endif  // __qtractorEngine_h

// end of qtractorEngine.h

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