/****************************************************************************
** Copyright (C) 2001-2010 Klaralvdalens Datakonsult AB.  All rights reserved.
**
** This file is part of the KD Tools library.
**
** Licensees holding valid commercial KD Tools licenses may use this file in
** accordance with the KD Tools Commercial License Agreement provided with
** the Software.
**
**
** This file may be distributed and/or modified under the terms of the
** GNU Lesser General Public License version 2 and version 3 as published by the
** Free Software Foundation and appearing in the file LICENSE.LGPL included.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Contact info@kdab.com if any conditions of this licensing are not
** clear to you.
**
**********************************************************************/

#include "kdupdaterupdateoperations.h"
#include "kdupdaterapplication.h"
#include "kdupdaterpackagesinfo.h"
#include "environment.h"

#include <QFile>
#include <QDir>
#include <QDirIterator>
#include <QProcess>
#include <QTextStream>
#include <QDebug>
#include <QTemporaryFile>


#include <cerrno>

#define SUPPORT_DETACHED_PROCESS_EXECUTION

#ifdef SUPPORT_DETACHED_PROCESS_EXECUTION
#ifdef Q_OS_WIN
#include <windows.h>
#endif
#endif

using namespace KDUpdater;

static bool removeDirectory(const QString &path, QString *errorString)
{
    Q_ASSERT(errorString);
    const QFileInfoList entries = QDir(path).entryInfoList(QDir::NoDotAndDotDot | QDir::AllEntries | QDir::Hidden);
    for (QFileInfoList::const_iterator it = entries.constBegin(); it != entries.constEnd(); ++it) {
        if (it->isDir() && !it->isSymLink()) {
            removeDirectory(it->filePath(), errorString);
        } else {
            QFile f(it->filePath());
            if (!f.remove())
                return false;
        }
    }

    errno = 0;
    const bool success = QDir().rmdir(path);
    if (errno)
        *errorString = QLatin1String(strerror(errno));
    return success;
}
/*
 * \internal
 * Returns a filename for a temporary file based on \a templateName
 */
static QString backupFileName(const QString &templateName)
{
    QTemporaryFile file(templateName);
    file.open();
    const QString name = file.fileName();
    file.close();
    file.remove();
    return name;
}

////////////////////////////////////////////////////////////////////////////
// KDUpdater::CopyOperation
////////////////////////////////////////////////////////////////////////////

CopyOperation::CopyOperation()
{
    setName(QLatin1String("Copy"));
}

CopyOperation::~CopyOperation()
{
    deleteFileNowOrLater(value(QLatin1String("backupOfExistingDestination")).toString());
}

void CopyOperation::backup()
{
    const QString dest = arguments().last();
    if (!QFile::exists(dest)) {
        clearValue(QLatin1String("backupOfExistingDestination"));
        return;
    }

    setValue(QLatin1String("backupOfExistingDestination"), backupFileName(dest));

    // race condition: The backup file could get created 
    // by another process right now. But this is the same 
    // in QFile::copy...
    const bool success = QFile::rename(dest, value(QLatin1String("backupOfExistingDestination")).toString());
    if (!success)
        setError(UserDefinedError, tr("Could not backup file %1.").arg(dest));
}

bool CopyOperation::performOperation()
{
    // We need two args to complete the copy operation.
    // First arg provides the complete file name of source
    // Second arg provides the complete file name of dest
    QStringList args = this->arguments();
    if (args.count() != 2) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments: %1 arguments given, 2 expected.").arg(args.count()));
        return false;
    }
    QString source = args.first();
    QString dest = args.last();

    // If destination file exists, then we cannot use QFile::copy()
    // because it does not overwrite an existing file. So we remove
    // the destination file.
    if (QFile::exists(dest)) {
        QFile file(dest);
        if (!file.remove()) {
            setError(UserDefinedError);
            setErrorString(tr("Could not remove destination file %1: %2").arg(dest, file.errorString()));
            return false;
        }
    }

    QFile file(source);
    const bool copied = file.copy(dest);
    if (!copied) {
        setError(UserDefinedError);
        setErrorString(tr("Could not copy %1 to %2: %3").arg(source, dest, file.errorString()));
    }
    return copied;
}

bool CopyOperation::undoOperation()
{
   const QString dest = arguments().last();

    QFile destF(dest);
    // first remove the dest
    if (!destF.remove()) {
        setError(UserDefinedError, tr("Could not delete file %1: %2").arg(dest, destF.errorString()));
        return false;
    }

    // no backup was done:
    // the copy destination file wasn't existing yet - that's no error
    if (!hasValue(QLatin1String("backupOfExistingDestination")))
        return true;

    QFile backupF(value(QLatin1String("backupOfExistingDestination")).toString());
    // otherwise we have to copy the backup back:
    const bool success = backupF.rename(dest);
    if (!success)
        setError(UserDefinedError, tr("Could not restore backup file into %1: %2").arg(dest, backupF.errorString()));
    return success;
}

/*!
 \reimp
 */
QDomDocument CopyOperation::toXml() const
{
    // we don't want to save the backupOfExistingDestination
    if (!hasValue(QLatin1String("backupOfExistingDestination")))
        return UpdateOperation::toXml();
    
    CopyOperation *const me = const_cast<CopyOperation *>(this);
    
    const QVariant v = value(QLatin1String("backupOfExistingDestination"));
    me->clearValue(QLatin1String("backupOfExistingDestination"));
    const QDomDocument xml = UpdateOperation::toXml();
    me->setValue(QLatin1String("backupOfExistingDestination"), v);
    return xml;
}

bool CopyOperation::testOperation()
{
    // TODO
    return true;
}

CopyOperation *CopyOperation::clone() const
{
    return new CopyOperation();
}


////////////////////////////////////////////////////////////////////////////
// KDUpdater::MoveOperation
////////////////////////////////////////////////////////////////////////////

MoveOperation::MoveOperation()
{
    setName(QLatin1String("Move"));
}

MoveOperation::~MoveOperation()
{
    deleteFileNowOrLater(value(QLatin1String("backupOfExistingDestination")).toString());
}

void MoveOperation::backup()
{
    const QString dest = arguments().last();
    if (!QFile::exists(dest)) {
        clearValue(QLatin1String("backupOfExistingDestination"));
        return;
    }

    setValue(QLatin1String("backupOfExistingDestination"), backupFileName(dest));

    // race condition: The backup file could get created 
    // by another process right now. But this is the same 
    // in QFile::copy...
    const bool success = QFile::rename(dest, value(QLatin1String("backupOfExistingDestination")).toString());
    if (!success)
        setError(UserDefinedError, tr("Could not backup file %1.").arg(dest));
}

bool MoveOperation::performOperation()
{
    // We need two args to complete the copy operation.
    // First arg provides the complete file name of source
    // Second arg provides the complete file name of dest
    QStringList args = this->arguments();
    if (args.count() != 2) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments: %1 arguments given, 2 expected.").arg(args.count()));
        return false;
    }

    QString source = args.first();
    QString dest = args.last();

    // If destination file exists, then we cannot use QFile::copy()
    // because it does not overwrite an existing file. So we remove
    // the destination file.
    if (QFile::exists(dest)) {
        QFile file(dest);
        if (!file.remove(dest)) {
            setError(UserDefinedError);
            setErrorString(tr("Could not remove destination file %1: %2").arg(dest, file.errorString()));
            return false;
        }
    }

    // Copy source to destination.
    QFile file(source);
    const bool copied = file.copy(source, dest);
    if (!copied) {
        setError(UserDefinedError);
        setErrorString(tr("Could not copy %1 to %2: %3").arg(source, dest, file.errorString()));
        return false;
    }

    return deleteFileNowOrLater(source);
}

bool MoveOperation::undoOperation()
{
    const QStringList args = arguments();
    const QString& source = args.first();
    const QString& dest = args.last();

    // first: copy back the destination to source
    QFile destF(dest);
    if (!destF.copy(source)) {
        setError(UserDefinedError, tr("Cannot copy %1 to %2: %3").arg(dest, source, destF.errorString()));
        return false;
    }

    // second: delete the move destination
    if (!deleteFileNowOrLater(dest)) {
        setError(UserDefinedError, tr("Cannot remove file %1."));
        return false;
    }

    // no backup was done:
    // the move destination file wasn't existing yet - that's no error
    if (!hasValue(QLatin1String("backupOfExistingDestination")))
        return true;

    // otherwise we have to copy the backup back:
    QFile backupF(value(QLatin1String("backupOfExistingDestination")).toString());
    const  bool success = backupF.rename(dest);
    if (!success)
        setError(UserDefinedError, tr("Cannot restore backup file for %1: %2").arg(dest, backupF.errorString()));

    return success;
}

bool MoveOperation::testOperation()
{
    // TODO
    return true;
}

MoveOperation *MoveOperation::clone() const
{
    return new MoveOperation;
}


////////////////////////////////////////////////////////////////////////////
// KDUpdater::DeleteOperation
////////////////////////////////////////////////////////////////////////////

DeleteOperation::DeleteOperation()
{
    setName(QLatin1String("Delete"));
}

DeleteOperation::~DeleteOperation()
{
    deleteFileNowOrLater(value(QLatin1String("backupOfExistingFile")).toString());
}

void DeleteOperation::backup()
{
    const QString fileName = arguments().first();
    setValue(QLatin1String("backupOfExistingFile"), backupFileName(fileName));
    QFile file(fileName);
    const bool success = file.copy(value(QLatin1String("backupOfExistingFile")).toString());
    if (!success)
        setError(UserDefinedError, tr("Cannot create backup of %1: %2").arg(fileName, file.errorString()));
}

bool DeleteOperation::performOperation()
{
    // Requires only one parameter. That is the name of
    // the file to remove.
    QStringList args = this->arguments();
    if (args.count() != 1) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments: %1 arguments given, 1 expected.").arg(args.count()));
        return false;
    }

    const QString fName = args.first();
    return deleteFileNowOrLater(fName);
}

bool DeleteOperation::undoOperation()
{
    if (!hasValue(QLatin1String("backupOfExistingFile")))
        return true;

    const QString fileName = arguments().first();
    QFile backupF(value(QLatin1String("backupOfExistingFile")).toString());
    const bool success = backupF.copy(fileName) && deleteFileNowOrLater(backupF.fileName());
    if (!success)
        setError(UserDefinedError, tr("Cannot restore backup file for %1: %2").arg(fileName, backupF.errorString()));

    return success;
}

bool DeleteOperation::testOperation()
{
    // TODO
    return true;
}

DeleteOperation *DeleteOperation::clone() const
{
    return new DeleteOperation;
}

/*!
 \reimp
 */
QDomDocument DeleteOperation::toXml() const
{
    // we don't want to save the backupOfExistingFile
    if (!hasValue(QLatin1String("backupOfExistingFile")))
        return UpdateOperation::toXml();
    
    DeleteOperation *const me = const_cast<DeleteOperation *>(this);
    
    const QVariant v = value(QLatin1String("backupOfExistingFile"));
    me->clearValue(QLatin1String("backupOfExistingFile"));
    const QDomDocument xml = UpdateOperation::toXml();
    me->setValue(QLatin1String("backupOfExistingFile"), v);
    return xml;
}

////////////////////////////////////////////////////////////////////////////
// KDUpdater::MkdirOperation
////////////////////////////////////////////////////////////////////////////

MkdirOperation::MkdirOperation()
{
    setName(QLatin1String("Mkdir"));
}

void MkdirOperation::backup()
{
    QString path = arguments().first();
    path.replace(QLatin1Char('\\'), QLatin1Char('/'));

    QDir createdDir = QDir::root();

    // find out, which part of the path is the first one we actually need to create
    int end = 0;
    while (true) {
        QString p = path.section(QLatin1Char('/'), 0, ++end);
        createdDir = QDir(p);
        if (!createdDir.exists())
            break;
        if (p == path) {
            // everything did already exist -> nothing to do for us (nothing to revert then, either)
            createdDir = QDir::root();
            break;
        }
    }

    setValue(QLatin1String("createddir"), createdDir.absolutePath());
}

bool MkdirOperation::performOperation()
{
    // Requires only one parameter. That is the name of
    // the file to remove.
    QStringList args = this->arguments();
    if (args.count() != 1) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments: %1 arguments given, 1 expected.").arg(args.count()));
        return false;
    }
    QString dirName = args.first();
    const bool created = QDir::root().mkpath(dirName);
    if (!created) {
        setError(UserDefinedError);
        setErrorString(tr("Could not create folder %1: Unknown error.").arg(dirName));
    }
    return created;
}

bool MkdirOperation::undoOperation()
{
    Q_ASSERT(arguments().count() == 1);

    QDir createdDir = QDir(value(QLatin1String("createddir")).toString());
    const bool forceremoval = QVariant(value(QLatin1String("forceremoval"))).toBool();

    // Since refactoring we know the mkdir operation which is creating the target path. If we do a full
    // uninstall prevent removing the full path including target, instead remove the target only. (QTIFW-46)
    if (hasValue(QLatin1String("uninstall-only")) && value(QLatin1String("uninstall-only")).toBool())
        createdDir = QDir(arguments().first());

    if (createdDir == QDir::root())
        return true;

    if (!createdDir.exists())
        return true;

    QString errorString;
    if (forceremoval)
        return removeDirectory(createdDir.path(), &errorString);

    // even remove some hidden, OS-created files in there
#if defined Q_OS_MAC
    QFile::remove(createdDir.path() + QLatin1String("/.DS_Store"));
#elif defined Q_OS_WIN
    QFile::remove(createdDir.path() + QLatin1String("/Thumbs.db"));
#endif

    errno = 0;
    const bool result = QDir::root().rmdir(createdDir.path());
    if (!result) {
        if (errorString.isEmpty())
            setError(UserDefinedError, tr("Cannot remove directory %1: %2").arg(createdDir.path(), errorString));
        else
            setError(UserDefinedError, tr("Cannot remove directory %1: %2").arg(createdDir.path(), QLatin1String(strerror(errno))));
    }
    return result;
}

bool KDUpdater::MkdirOperation::testOperation()
{
    // TODO
    return true;
}

MkdirOperation *MkdirOperation::clone() const
{
    return new MkdirOperation;
}

////////////////////////////////////////////////////////////////////////////
// KDUpdater::RmdirOperation
////////////////////////////////////////////////////////////////////////////

RmdirOperation::RmdirOperation()
{
    setValue(QLatin1String("removed"), false);
    setName(QLatin1String("Rmdir"));
}

void RmdirOperation::backup()
{
    // nothing to backup - rollback will just create the directory
}

bool RmdirOperation::performOperation()
{
    // Requires only one parameter. That is the name of
    // the file to remove.
    QStringList args = this->arguments();
    if (args.count() != 1) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments: %1 arguments given, 1 expected.").arg(args.count()));
        return false;
    }

    QString dirName = args.first();
    QDir dir(dirName);
    if (!dir.exists()) {
        setError(UserDefinedError);
        setErrorString(tr("Could not remove folder %1: The folder does not exist.").arg(dirName));
        return false;
    }

    errno = 0;
    const bool removed = dir.rmdir(dirName);
    setValue(QLatin1String("removed"), removed);
    if (!removed) {
        setError(UserDefinedError);
        setErrorString(tr("Could not remove folder %1: %2").arg(dirName, QLatin1String(strerror(errno))));
    }
    return removed;
}

bool RmdirOperation::undoOperation()
{
   if (!value(QLatin1String("removed")).toBool())
        return true;

    const QFileInfo fi(arguments().first());
    errno = 0;
    const bool success = fi.dir().mkdir(fi.fileName());
    if( !success)
        setError(UserDefinedError, tr("Cannot recreate directory %1: %2").arg(fi.fileName(), QLatin1String(strerror(errno))));

    return success;
}

bool RmdirOperation::testOperation()
{
    // TODO
    return true;
}

RmdirOperation *RmdirOperation::clone() const
{
    return new RmdirOperation;
}


////////////////////////////////////////////////////////////////////////////
// KDUpdater::AppendFileOperation
////////////////////////////////////////////////////////////////////////////

AppendFileOperation::AppendFileOperation()
{
    setName(QLatin1String("AppendFile"));
}

void AppendFileOperation::backup()
{
    const QString filename = arguments().first();

    QFile file(filename);
    if (!file.exists())
        return; // nothing to backup

    setValue(QLatin1String("backupOfFile"), backupFileName(filename));
    if (!file.copy(value(QLatin1String("backupOfFile")).toString())) {
        setError(UserDefinedError, tr("Cannot backup file %1: %2").arg(filename, file.errorString()));
        clearValue(QLatin1String("backupOfFile"));
    }
}

bool AppendFileOperation::performOperation()
{
    // This operation takes two arguments. First argument is the name
    // of the file into which a text has to be appended. Second argument
    // is the text to append.
    QStringList args = this->arguments();
    if (args.count() != 2) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments: %1 arguments given, 2 expected.").arg(args.count()));
        return false;
    }

    QString fName = args.first();
    QString text = args.last();

    QFile file(fName);
    if (!file.open(QFile::Append)) {
        // first we rename the file, then we copy it to the real target and open the copy - the renamed original is then marked for deletion
        const QString newName = backupFileName(fName);
        if (!QFile::rename(fName, newName) && QFile::copy(newName, fName) && file.open(QFile::Append)) {
            QFile::rename(newName, fName);
            setError(UserDefinedError);
            setErrorString(tr("Could not open file %1 for writing: %2").arg(file.fileName(), file.errorString()));
            return false;
        }
        deleteFileNowOrLater(newName);
    }

    QTextStream ts(&file);
    ts << text;
    file.close();

    return true;
}

bool AppendFileOperation::undoOperation()
{
   // backupOfFile being empty -> file didn't exist before -> no error
    const QString filename = arguments().first();
    const QString backupOfFile = value(QLatin1String("backupOfFile")).toString();
    if (!backupOfFile.isEmpty() && !QFile::exists(backupOfFile)) {
        setError(UserDefinedError, tr("Cannot find backup file for %1.").arg(filename));
        return false;
    }

    const bool removed = deleteFileNowOrLater(filename);
    if (!removed) {
        setError(UserDefinedError, tr("Could not restore backup file for %1.").arg(filename));
        return false;
    }

    // got deleted? We might be done, if it didn't exist before
    if (backupOfFile.isEmpty())
        return true;

    QFile backupFile(backupOfFile);
    const bool success = backupFile.rename(filename);
    if (!success)
        setError(UserDefinedError, tr("Could not restore backup file for %1: %2").arg(filename, backupFile.errorString()));
    return success;
}

bool AppendFileOperation::testOperation()
{
    // TODO
    return true;
}

AppendFileOperation *AppendFileOperation::clone() const
{
    return new AppendFileOperation;
}


////////////////////////////////////////////////////////////////////////////
// KDUpdater::PrependFileOperation
////////////////////////////////////////////////////////////////////////////

PrependFileOperation::PrependFileOperation()
{
    setName(QLatin1String("PrependFile"));
}

void PrependFileOperation::backup()
{
    const QString filename = arguments().first();

    QFile file(filename);
    if (!file.exists())
        return; // nothing to backup

    setValue(QLatin1String("backupOfFile"), backupFileName(filename));
    if (!file.copy(value(QLatin1String("backupOfFile")).toString())) {
        setError(UserDefinedError, tr("Cannot backup file %1: %2").arg(filename, file.errorString()));
        clearValue(QLatin1String("backupOfFile"));
    }
}

bool PrependFileOperation::performOperation()
{
    // This operation takes two arguments. First argument is the name
    // of the file into which a text has to be appended. Second argument
    // is the text to append.
    QStringList args = this->arguments();
    if (args.count() != 2) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments: %1 arguments given, 2 expected.").arg(args.count()));
        return false;
    }

    QString fName = args.first();
    QString text = args.last();

    // Load the file first.
    QFile file(fName);
    if (!file.open(QFile::ReadOnly)) {
        setError(UserDefinedError);
        setErrorString(tr("Could not open file %1 for reading: %2").arg(file.fileName(), file.errorString()));
        return false;
    }
    QString fContents(QLatin1String(file.readAll()));
    file.close();

    // Prepend text to the file text
    fContents = text + fContents;

    // Now re-open the file in write only mode.
    if (!file.open(QFile::WriteOnly)) {
        // first we rename the file, then we copy it to the real target and open the copy - the renamed original is then marked for deletion
        const QString newName = backupFileName(fName);
        if (!QFile::rename(fName, newName) && QFile::copy(newName, fName) && file.open(QFile::WriteOnly)) {
            QFile::rename(newName, fName);
            setError(UserDefinedError);
            setErrorString(tr("Could not open file %1 for writing: %2").arg(file.fileName(), file.errorString()));
            return false;
        }
        deleteFileNowOrLater(newName);
    }
    QTextStream ts(&file);
    ts << fContents;
    file.close();

    return true;
}

bool PrependFileOperation::undoOperation()
{
    // bockupOfFile being empty -> file didn't exist before -> no error
    const QString filename = arguments().first();
    const QString backupOfFile = value(QLatin1String("backupOfFile")).toString();
    if (!backupOfFile.isEmpty() && !QFile::exists(backupOfFile)) {
        setError(UserDefinedError, tr("Cannot find backup file for %1.").arg(filename));
        return false;
    }

    if (!deleteFileNowOrLater(filename)) {
        setError(UserDefinedError, tr("Cannot restore backup file for %1.").arg(filename));
        return false;
    }

    // got deleted? We might be done, if it didn't exist before
    if (backupOfFile.isEmpty())
        return true;

    QFile backupF(backupOfFile);
    const bool success = backupF.rename(filename);
    if (!success)
        setError(UserDefinedError, tr("Cannot restore backup file for %1: %2").arg(filename, backupF.errorString()));

    return success;
}

bool PrependFileOperation::testOperation()
{
    // TODO
    return true;
}

PrependFileOperation *PrependFileOperation::clone() const
{
    return new PrependFileOperation;
}


////////////////////////////////////////////////////////////////////////////
// KDUpdater::ExecuteOperation
////////////////////////////////////////////////////////////////////////////

ExecuteOperation::ExecuteOperation()
    : QObject()
{
    setName(QLatin1String("Execute"));
}

void ExecuteOperation::backup()
{
    // this is not possible, since the process can do whatever...
}

#if defined(SUPPORT_DETACHED_PROCESS_EXECUTION) && defined(Q_OS_WIN)
// stolen from qprocess_win.cpp
static QString qt_create_commandline(const QString &program, const QStringList &arguments)
{
    QString args;
    if (!program.isEmpty()) {
        QString programName = program;
        if (!programName.startsWith(QLatin1Char('\"')) && !programName.endsWith(QLatin1Char('\"')) && programName.contains(QLatin1Char(' ')))
            programName = QLatin1Char('\"') + programName + QLatin1Char('\"');
        programName.replace(QLatin1Char('/'), QLatin1Char('\\'));

        // add the prgram as the first arg ... it works better
        args = programName + QLatin1Char(' ');
    }

    for (int i = 0; i < arguments.size(); ++i) {
        QString tmp = arguments.at(i);
        // in the case of \" already being in the string the \ must also be escaped
        tmp.replace(QLatin1String("\\\""), QLatin1String("\\\\\""));
        // escape a single " because the arguments will be parsed
        tmp.replace(QLatin1Char('\"'), QLatin1String("\\\""));
        if (tmp.isEmpty() || tmp.contains(QLatin1Char(' ')) || tmp.contains(QLatin1Char('\t'))) {
            // The argument must not end with a \ since this would be interpreted
            // as escaping the quote -- rather put the \ behind the quote: e.g.
            // rather use "foo"\ than "foo\"
            QString endQuote(QLatin1Char('\"'));
            int i = tmp.length();
            while (i > 0 && tmp.at(i - 1) == QLatin1Char('\\')) {
                --i;
                endQuote += QLatin1Char('\\');
            }
            args += QLatin1String(" \"") + tmp.left(i) + endQuote;
        } else {
            args += QLatin1Char(' ') + tmp;
        }
    }
    return args;
}
#endif

bool ExecuteOperation::performOperation()
{
    // This operation receives only one argument. It is the complete
    // command line of the external program to execute.
    QStringList args = this->arguments();
    if (args.isEmpty()) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments: %1 arguments given, 2 expected.").arg(args.count()));
        return false;
    }

    QList<int> allowedExitCodes;
    
    QRegExp re(QLatin1String("^\\{((-?\\d+,)*-?\\d+)\\}$"));
    if (re.exactMatch(args.first())) {
        const QStringList numbers = re.cap(1).split(QLatin1Char(','));
        for (QStringList::const_iterator it = numbers.begin(); it != numbers.end(); ++it)
            allowedExitCodes.push_back(it->toInt());
        args.pop_front();
    } else {
        allowedExitCodes.push_back(0);
    }

    bool success = false;
#ifdef SUPPORT_DETACHED_PROCESS_EXECUTION
    // unix style: when there's an ampersand after the command, it's started detached
    if (args.count() >= 2 && args.last() == QLatin1String("&")) {
        args.pop_back();
#ifdef Q_OS_WIN
        QString arguments = qt_create_commandline(args.front(), args.mid(1));
        
        PROCESS_INFORMATION pinfo;

        STARTUPINFOW startupInfo = { sizeof(STARTUPINFO), 0, 0, 0,
                                     static_cast< ulong >(CW_USEDEFAULT), static_cast< ulong >(CW_USEDEFAULT),
                                     static_cast< ulong >(CW_USEDEFAULT), static_cast< ulong >(CW_USEDEFAULT),
                                     0, 0, 0, STARTF_USESHOWWINDOW, SW_HIDE, 0, 0, 0, 0, 0
                                   };
        success = CreateProcess(0, (wchar_t*)arguments.utf16(),
                                0, 0, FALSE, CREATE_UNICODE_ENVIRONMENT | CREATE_NEW_CONSOLE, 0,
                                0,
                                &startupInfo, &pinfo);

#else
        success = QProcess::startDetached(args.front(), args.mid(1));
#endif
    }
    else
#endif
    {
        Environment::instance().applyTo(&process); //apply non-persistent variables
        process.start(args.front(), args.mid(1));
        
        QEventLoop loop;
        QObject::connect(&process, SIGNAL(finished(int, QProcess::ExitStatus)), &loop, SLOT(quit()));
        QObject::connect(&process, SIGNAL(readyRead()), this, SLOT(readProcessOutput()));
        success = process.waitForStarted(-1);
        if (success) {
            loop.exec();
            setValue(QLatin1String("ExitCode"), process.exitCode());
            success = allowedExitCodes.contains(process.exitCode());
        }
    }
    if (!success) {
        setError(UserDefinedError);
        setErrorString(tr("Execution failed: %1").arg(args.join(QLatin1String(" "))));
    }

    return success;
}

/*!
 Cancels the ExecuteOperation. This methods tries to terminate the process
 gracefully by calling QProcess::terminate. After 10 seconds, the process gets killed.
 */
void ExecuteOperation::cancelOperation()
{
    if (process.state() == QProcess::Running)
        process.terminate();
    if (!process.waitForFinished(10000))
        process.kill();
}

void ExecuteOperation::readProcessOutput()
{
    QByteArray output = process.readAll();
    if (!output.isEmpty())
        emit outputTextChanged(QString::fromLocal8Bit(output));
}

bool ExecuteOperation::undoOperation()
{
    // this is not possible, since the process can do whatever...
    return false;
}

bool ExecuteOperation::testOperation()
{
    // TODO
    return true;
}

ExecuteOperation *ExecuteOperation::clone() const
{
    return new ExecuteOperation;
}


////////////////////////////////////////////////////////////////////////////
// KDUpdater::UpdatePackageOperation
////////////////////////////////////////////////////////////////////////////

UpdatePackageOperation::UpdatePackageOperation()
{
    setName(QLatin1String("UpdatePackage"));
}

void UpdatePackageOperation::backup()
{
    const PackageInfo info = application()->packagesInfo()->packageInfo(application()->packagesInfo()->findPackageInfo(arguments().first()));
    setValue(QLatin1String("oldVersion"), info.version);
    setValue(QLatin1String("oldDate"), info.lastUpdateDate);
}

bool UpdatePackageOperation::performOperation()
{
    // This operation receives three arguments : the name of the package
    // the new version and the release date
    const QStringList args = this->arguments();
    if (args.count() != 3) {
        setError(InvalidArguments, tr("Invalid arguments: %1 arguments given, 3 expected.").arg(args.count()));
        return false;
    }

    const QString &packageName = args.at(0);
    const QString &version = args.at(1);
    const QDate date = QDate::fromString(args.at(2));
    const bool success = application()->packagesInfo()->updatePackage(packageName, version, date);
    if (!success)
        setError(UserDefinedError, tr("Cannot update %1-%2").arg(packageName, version));

    return success;
}

bool UpdatePackageOperation::undoOperation()
{
    const QString packageName = arguments().first();
    const QString version = arguments().at(1);
    const QString oldVersion = value(QLatin1String("oldVersion")).toString();
    const QDate oldDate = value(QLatin1String("oldDate")).toDate();
    const bool success = application()->packagesInfo()->updatePackage(packageName, oldVersion, oldDate);
    if (!success)
        setError(UserDefinedError, tr("Cannot restore %1-%2").arg(packageName, version));

    return success;
}

bool UpdatePackageOperation::testOperation()
{
    // TODO
    return true;
}

UpdatePackageOperation *UpdatePackageOperation::clone() const
{
    return new UpdatePackageOperation;
}


////////////////////////////////////////////////////////////////////////////
// KDUpdater::UpdateCompatOperation
////////////////////////////////////////////////////////////////////////////

UpdateCompatOperation::UpdateCompatOperation()
{
    setName(QLatin1String("UpdateCompatLevel"));
}

void UpdateCompatOperation::backup()
{
    setValue(QLatin1String("oldCompatLevel"), application()->packagesInfo()->compatLevel());
}

bool UpdateCompatOperation::performOperation()
{
    // This operation receives one argument : the new compat level
    const QStringList args = this->arguments();
    if (args.count() != 1) {
        setError(InvalidArguments, tr("Invalid arguments: %1 arguments given, 1 expected.").arg(args.count()));
        return false;
    }

    const int level = args.first().toInt();
    application()->packagesInfo()->setCompatLevel(level);
    return true;
}

bool UpdateCompatOperation::undoOperation()
{
    if (!hasValue(QLatin1String("oldCompatLevel"))) {
        setError(UserDefinedError, tr("Cannot restore previous compat-level"));
        return false;
    }

    application()->packagesInfo()->setCompatLevel(value(QLatin1String("oldCompatLevel")).toInt());
    return true;
}

bool UpdateCompatOperation::testOperation()
{
    // TODO
    return true;
}

UpdateCompatOperation *UpdateCompatOperation::clone() const
{
    return new UpdateCompatOperation;
}