/**
  * @RDE_HEADER@
  * VdSession
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Astrid Müller, SGAS, 2018-02-26
  */

#pragma once

#include "avm_export.h"
#include "logger.h"
#include <QObject>
#include <QString>
#include <QTimer>


namespace AudioVideoManagement
{

class VdControl;

/**
 * The session is responsible for
 * - observing the connection to AVS
 * - regularly issuing a KeepAlive
 * - setting the context after a successful connect.
 *
 * In the application there are several clients communicating with the AVS
 * via a single VdControl-instance.
 * When the connection breaks down for some reason it will be re-established.
 * After that there must be one single instance which is responsible
 * to again set the context and user profile for the session.
 * The other clients may continue to communicate with the AVS only after
 * context and profile have been set.
 *
 * @author Astrid Müller, Christian Fröbel
 */
class AVM_COMMON_EXPORT VdSession : public QObject
{
  Q_OBJECT

public:
  VdSession(VdControl *ctrl, int exerciseId, bool keepAliveEnabled);

  /** Access to underlying VdControl instance. */
  VdControl *control() { return m_ctrl; }

  bool isEstablished() const { return m_established; }

signals:
  /**
   * Will be emitted after the connection to AVS has successfully been established
   * and the context has been set.
   */
  void sessionEstablished();
  void disconnected();

private slots:
  void onConnected();
  void onDisconnected();
  void onKeepAliveTimerElapsed();

private:
  VdControl    *m_ctrl;
  bool          m_established{false};
  int           m_exerciseId;
  const bool    m_keepAliveEnabled;
  QTimer        m_keepAliveTimer;
  LOGGER_T      m_logger;
};

} // namespace AudioVideoManagement