/****************************************************************************
**
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** This file is part of the QtCore module of the Qt Toolkit.
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** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
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**
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** review the following information:
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****************************************************************************/

#ifndef QPROCESS_P_H
#define QPROCESS_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "QtCore/qprocess.h"
#include "QtCore/qstringlist.h"
#include "private/qringbuffer_p.h"
#include "private/qiodevice_p.h"

#ifdef Q_OS_WIN
#include "QtCore/qt_windows.h"
typedef HANDLE Q_PIPE;
#define INVALID_Q_PIPE INVALID_HANDLE_VALUE
#else
typedef int Q_PIPE;
#define INVALID_Q_PIPE -1
#endif

#ifndef QT_NO_PROCESS

class QSocketNotifier;
class QWindowsPipeWriter;
class QWinEventNotifier;
class QTimer;

class QProcessPrivate : public QIODevicePrivate
{
public:
    Q_DECLARE_PUBLIC(QProcess)

    struct Channel {
        enum ProcessChannelType {
            Normal = 0,
            PipeSource = 1,
            PipeSink = 2,
            Redirect = 3
            // if you add "= 4" here, increase the number of bits below
        };

        Channel() : process(0), notifier(0), type(Normal), closed(false), append(false)
        {
            pipe[0] = INVALID_Q_PIPE;
            pipe[1] = INVALID_Q_PIPE;
        }
        
        void clear()
        {
            switch (type) {
            case PipeSource:
                Q_ASSERT(process);
                process->stdinChannel.type = Normal;
                process->stdinChannel.process = 0;
                break;
            case PipeSink:
                Q_ASSERT(process);
                process->stdoutChannel.type = Normal;
                process->stdoutChannel.process = 0;
                break;
            }

            type = Normal;
            file.clear();
            process = 0;
        }

        Channel &operator=(const QString &fileName)
        {
            clear();
            file = fileName;
            type = fileName.isEmpty() ? Normal : Redirect;
            return *this;
        }

        void pipeTo(QProcessPrivate *other)
        {
            clear();
            process = other;
            type = PipeSource;
        }

        void pipeFrom(QProcessPrivate *other)
        {
            clear();
            process = other;
            type = PipeSink;
        }

        QString file;
        QProcessPrivate *process;
        QSocketNotifier *notifier;
        Q_PIPE pipe[2];

        unsigned type : 2;
        bool closed : 1;
        bool append : 1;
    };

    QProcessPrivate();
    virtual ~QProcessPrivate();

    // private slots
    bool _q_canReadStandardOutput();
    bool _q_canReadStandardError();
    bool _q_canWrite();
    bool _q_startupNotification();
    bool _q_processDied();
    void _q_notified();

    QProcess::ProcessChannel processChannel;
    QProcess::ProcessChannelMode processChannelMode;
    QProcess::ProcessError processError;
    QProcess::ProcessState processState;
    QString workingDirectory;
    Q_PID pid;
    int sequenceNumber;

    bool dying;
    bool emittedReadyRead;
    bool emittedBytesWritten;

    Channel stdinChannel;
    Channel stdoutChannel;
    Channel stderrChannel;
    bool createChannel(Channel &channel);
    void closeWriteChannel();

    QString program;
    QStringList arguments;
    QStringList environment;

    QRingBuffer outputReadBuffer;
    QRingBuffer errorReadBuffer;
    QRingBuffer writeBuffer;

    Q_PIPE childStartedPipe[2];
    Q_PIPE deathPipe[2];
    void destroyPipe(Q_PIPE pipe[2]);

    QSocketNotifier *startupSocketNotifier;
    QSocketNotifier *deathNotifier;

    // the wonderful windows notifier
    QTimer *notifier;
    QWindowsPipeWriter *pipeWriter;
    QWinEventNotifier *processFinishedNotifier;

    void startProcess();
#ifdef Q_OS_UNIX
    void execChild(const char *workingDirectory, char **path, char **argv, char **envp);
#endif
    bool processStarted();
    void terminateProcess();
    void killProcess();
    void findExitCode();
#ifdef Q_OS_UNIX
    bool waitForDeadChild();
#endif
#ifdef Q_OS_WIN
    void flushPipeWriter();
    qint64 pipeWriterBytesToWrite() const;
#endif

    static bool startDetached(const QString &program, const QStringList &arguments, const QString &workingDirectory = QString(),
                              qint64 *pid = 0);

    int exitCode;
    QProcess::ExitStatus exitStatus;
    bool crashed;
#ifdef Q_OS_UNIX
    int serial;
#endif

    bool waitForStarted(int msecs = 30000);
    bool waitForReadyRead(int msecs = 30000);
    bool waitForBytesWritten(int msecs = 30000);
    bool waitForFinished(int msecs = 30000);
    bool waitForWrite(int msecs = 30000);

    qint64 bytesAvailableFromStdout() const;
    qint64 bytesAvailableFromStderr() const;
    qint64 readFromStdout(char *data, qint64 maxlen);
    qint64 readFromStderr(char *data, qint64 maxlen);
    qint64 writeToStdin(const char *data, qint64 maxlen);

    void cleanup();
#ifdef Q_OS_UNIX
    static void initializeProcessManager();
#endif
};

#endif // QT_NO_PROCESS

#endif // QPROCESS_P_H