/**************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** GNU General Public License Usage
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** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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#ifndef PROGRESSCOORDINATOR_H
#define PROGRESSCOORDINATOR_H

#include "installer_global.h"

#include <QtCore/QHash>
#include <QtCore/QObject>
#include <QtCore/QPointer>

namespace QInstaller {

class INSTALLER_EXPORT ProgressCoordinator : public QObject
{
    Q_OBJECT

public:
    static ProgressCoordinator *instance();
    ~ProgressCoordinator();

    void registerPartProgress(QObject *sender, const char *signal, double partProgressSize);

public slots:
    void reset();
    void setUndoMode();

    QString labelText() const;
    void setLabelText(const QString &text);

    int progressInPercentage() const;
    void partProgressChanged(double fraction);

    void addManualPercentagePoints(int value);
    void addReservePercentagePoints(int value);

    void emitDetailTextChanged(const QString &text);
    void emitLabelAndDetailTextChanged(const QString &text);

    void emitDownloadStatus(const QString &status);

signals:
    void detailTextChanged(const QString &text);
    void detailTextResetNeeded();
    void downloadStatusChanged(const QString &status);

protected:
    explicit ProgressCoordinator(QObject *parent);

private:
    double allPendingCalculatedPartPercentages(QObject *excludeKeyObject = 0);
    void disconnectAllSenders();

private:
    QHash<QPointer<QObject>, double> m_senderPendingCalculatedPercentageHash;
    QHash<QPointer<QObject>, double> m_senderPartProgressSizeHash;
    QString m_installationLabelText;
    double m_currentCompletePercentage;
    double m_currentBasePercentage;
    int m_manualAddedPercentage;
    int m_reservedPercentage;
    bool m_undoMode;
    double m_reachedPercentageBeforeUndo;
};

} //namespace QInstaller

#endif //PROGRESSCOORDINATOR_H
