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** This file is part of the Qt Installer Framework.
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#ifndef OBSERVER_H
#define OBSERVER_H

#include <QCryptographicHash>
#include <QObject>

namespace QInstaller {

class Observer : public QObject
{
    Q_OBJECT
    Q_DISABLE_COPY(Observer)

public:
    Observer() {}
    virtual ~Observer() {}

    virtual int progressValue() const = 0;
    virtual QString progressText() const = 0;
};

class FileTaskObserver : public Observer
{
    Q_OBJECT
    Q_DISABLE_COPY(FileTaskObserver)

public:
    FileTaskObserver(QCryptographicHash::Algorithm algorithm);
    ~FileTaskObserver();

    int progressValue() const;
    QString progressText() const;

    QByteArray checkSum() const;
    void addCheckSumData(const char *data, int length);

    void addSample(qint64 sample);
    void timerEvent(QTimerEvent *event);

    void setBytesTransfered(qint64 bytesTransfered);
    void addBytesTransfered(qint64 bytesTransfered);
    void setBytesToTransfer(qint64 bytesToTransfer);

private:
    void init();

private:
    int m_timerId;
    int m_timerInterval;

    qint64 m_bytesTransfered;
    qint64 m_bytesToTransfer;

    qint64 m_samples[50];
    quint32 m_sampleIndex;
    qint64 m_bytesPerSecond;
    qint64 m_currentSpeedBin;

    QCryptographicHash m_hash;
};

}   // namespace QInstaller

#endif // OBSERVER_H