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#ifndef COMMUNICATIONSTARTER_H

#define COMMUNICATIONSTARTER_H

#include <QtCore/QSharedPointer>

#include <QtCore/QObject>

namespace trk {

class TrkDevice;

class BluetoothListener;

struct BaseCommunicationStarterPrivate;

/* BaseCommunicationStarter: A QObject that repeatedly tries to open a

 * trk device until a connection succeeds or a timeout occurs (emitting

 * signals), allowing to do something else in the foreground (local event loop

 * [say QMessageBox] or some asynchronous operation). If the initial

 * connection attempt in start() fails, the

 * virtual initializeStartupResources() is called to initialize resources

 * required to pull up the communication (namely Bluetooth listeners).

 * The base class can be used as is to prompt the user to launch App TRK for a

 * serial communication as this requires no further resource setup. */

class BaseCommunicationStarter : public QObject {

    Q_OBJECT

    Q_DISABLE_COPY(BaseCommunicationStarter)

public:

    typedef QSharedPointer<TrkDevice> TrkDevicePtr;

    enum State { Running, Connected, TimedOut };

    explicit BaseCommunicationStarter(const TrkDevicePtr& trkDevice, QObject *parent = 0);

    virtual ~BaseCommunicationStarter();

    int intervalMS() const;

    void setIntervalMS(int i);

    int attempts() const;

    void setAttempts(int a);

    QString device() const;

    void setDevice(const QString &);

    State state() const;

    QString errorString() const;

    enum StartResult {

        Started,               // Starter is now running.

        ConnectionSucceeded,   /* Initial connection attempt succeeded,

                                * no need to keep running. */

        StartError             // Error occurred during start.

    };

    StartResult start();

signals:

    void connected();

    void timeout();

    void message(const QString &);

private slots:

    void slotTimer();

protected:

    virtual bool initializeStartupResources(QString *errorMessage);

private:

    inline void stopTimer();

    BaseCommunicationStarterPrivate *d;

};

/* AbstractBluetoothStarter: Repeatedly tries to open a trk Bluetooth

 * device. Note that in case a Listener is already running mode, the

 * connection will succeed immediately.

 * initializeStartupResources() is implemented to fire up the listener.

 * Introduces a new virtual createListener() that derived classes must

 * implement as a factory function that creates and sets up the

 * listener (mode, message connection, etc). */

class AbstractBluetoothStarter : public BaseCommunicationStarter {

    Q_OBJECT

    Q_DISABLE_COPY(AbstractBluetoothStarter)

public:

protected:

    explicit AbstractBluetoothStarter(const TrkDevicePtr& trkDevice, QObject *parent = 0);

    // Implemented to fire up the listener.

    virtual bool initializeStartupResources(QString *errorMessage);

    // New virtual: Overwrite to create and parametrize the listener.

    virtual BluetoothListener *createListener() = 0;

};

/* ConsoleBluetoothStarter: Convenience class for console processes. Creates a

 * listener in "Listen" mode with the messages redirected to standard output. */

class ConsoleBluetoothStarter : public AbstractBluetoothStarter {

    Q_OBJECT

    Q_DISABLE_COPY(ConsoleBluetoothStarter)

public:

    static bool startBluetooth(const TrkDevicePtr& trkDevice,

                               QObject *listenerParent,

                               const QString &device,

                               int attempts,

                               QString *errorMessage);

protected:

    virtual BluetoothListener *createListener();

private:

    explicit ConsoleBluetoothStarter(const TrkDevicePtr& trkDevice,

                                     QObject *listenerParent,

                                     QObject *parent = 0);

    QObject *m_listenerParent;

};

} // namespace trk

#endif // COMMUNICATIONSTARTER_H