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#ifndef TRKDEVICE_H

#define TRKDEVICE_H

#include "callback.h"

#include <QtCore/QObject>

#include <QtCore/QVariant>

#include <QtCore/QByteArray>

#include <QtCore/QSharedPointer>

QT_BEGIN_NAMESPACE

class QIODevice;

QT_END_NAMESPACE

namespace trk {

struct TrkResult;

struct TrkMessage;

struct TrkDevicePrivate;

/* TrkDevice: Implements a Windows COM or Linux device for

 * Trk communications. Provides synchronous write and asynchronous

 * read operation.

 * The serialFrames property specifies whether packets are encapsulated in

 * "0x90 <length>" frames, which is currently the case for serial ports. 

 * Contains a write message queue allowing

 * for queueing messages with a notification callback. If the message receives

 * an ACK, the callback is invoked.

 * The special message TRK_WRITE_QUEUE_NOOP_CODE code can be used for synchronisation.

 * The respective  message will not be sent, the callback is just invoked. */

enum { TRK_WRITE_QUEUE_NOOP_CODE = 0x7f };

typedef trk::Callback<const TrkResult &> TrkCallback;

class TrkDevice : public QObject

{

    Q_OBJECT

    Q_PROPERTY(bool serialFrame READ serialFrame WRITE setSerialFrame)

    Q_PROPERTY(bool verbose READ verbose WRITE setVerbose)

public:

    explicit TrkDevice(QObject *parent = 0);

    virtual ~TrkDevice();

    bool open(const QString &port, QString *errorMessage);

    bool isOpen() const;

    QString errorString() const;

    bool serialFrame() const;

    void setSerialFrame(bool f);

    int verbose() const;

    void setVerbose(int b);

    // Enqueue a message with a notification callback.

    void sendTrkMessage(unsigned char code,

                        TrkCallback callBack = TrkCallback(),

                        const QByteArray &data = QByteArray(),

                        const QVariant &cookie = QVariant());

    // Enqeue an initial ping

    void sendTrkInitialPing();

    // Send an Ack synchronously, bypassing the queue

    bool sendTrkAck(unsigned char token);

signals:

    void messageReceived(const trk::TrkResult &result);

    // Emitted with the contents of messages enclosed in 07e, not for log output

    void rawDataReceived(const QByteArray &data);

    void error(const QString &msg);

    void logMessage(const QString &msg);

private slots:

    void slotMessageReceived(const trk::TrkResult &result, const QByteArray &a);

protected slots:

    void emitError(const QString &msg);

    void emitLogMessage(const QString &msg);

public slots:

    void close();

private:

    void readMessages();

    TrkDevicePrivate *d;

};

} // namespace trk

#endif // TRKDEVICE_H