/****************************************************************************
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** This file is part of the QtAddOn.JsonStream module of the Qt.
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****************************************************************************/

#ifndef PROCESS_BACKEND_H
#define PROCESS_BACKEND_H

#include <QObject>
#include "qprocessinfo.h"
#include "qprocessmanager-global.h"

QT_BEGIN_NAMESPACE_PROCESSMANAGER

class Q_ADDON_PROCESSMANAGER_EXPORT QProcessBackend : public QObject
{
    Q_OBJECT

protected:
    QProcessBackend(const QProcessInfo& info, QObject *parent);

public:
    virtual ~QProcessBackend();

    virtual QString     name() const;
    virtual QString     identifier() const;
    virtual QString     program() const;
    virtual QStringList arguments() const;
    virtual QVariantMap environment() const;
    virtual QString     workingDirectory() const;

    virtual QString     errorString() const;

    virtual Q_PID  pid() const;

    virtual qint32 actualPriority() const;
    virtual qint32 desiredPriority() const;
    virtual void   setDesiredPriority(qint32);

    virtual qint32 actualOomAdjustment() const;
    virtual qint32 desiredOomAdjustment() const;
    virtual void   setDesiredOomAdjustment(qint32);

    virtual QProcess::ProcessState state() const = 0;
    virtual void   start() = 0;
    virtual void   stop(int timeout = 500) = 0;
    virtual qint64 write(const char *data, qint64 maxSize);

    qint64 write(const char *data);
    qint64 write(const QByteArray& byteArray);

    enum EchoOutput { EchoNone, EchoStdoutOnly, EchoStderrOnly, EchoStdoutStderr };
    EchoOutput echo() const;
    void       setEcho(EchoOutput);

    QProcessInfo processInfo() const;

protected:
    virtual void handleStandardOutput(const QByteArray &output);
    virtual void handleStandardError(const QByteArray &output);

    void createName();

signals:
    void started();
    void error(QProcess::ProcessError error);
    void finished(int, QProcess::ExitStatus);
    void stateChanged(QProcess::ProcessState);
    void standardOutput(const QByteArray&);
    void standardError(const QByteArray&);

protected:
    QString     m_name;
    int         m_id;
    QProcessInfo m_info;
    EchoOutput  m_echo;
};

QT_END_NAMESPACE_PROCESSMANAGER

QT_PROCESSMANAGER_DECLARE_METATYPE_PTR(QProcessBackend)

#endif // PROCESS_BACKEND_H