/**************************************************************************
**
** This file is part of Installer Framework
**
** Copyright (c) 2011-2012 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
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**************************************************************************/

#include "linereplaceoperation.h"

#include <QtCore/QDir>
#include <QtCore/QFile>
#include <QtCore/QTextStream>

using namespace QInstaller;

LineReplaceOperation::LineReplaceOperation()
{
    setName(QLatin1String("LineReplace"));
}

void LineReplaceOperation::backup()
{
}

bool LineReplaceOperation::performOperation()
{
    const QStringList args = arguments();

    // Arguments:
    // 1. filename
    // 2. startsWith Search-String
    // 3. Replace-Line-String
    if (args.count() != 3) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments in %0: %1 arguments given, exactly 3 expected.").arg(name()).arg(args
            .count()));
        return false;
    }
    const QString fileName = args.at(0);
    const QString searchString = args.at(1);
    const QString replaceString = args.at(2);

    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        setError(UserDefinedError);
        setErrorString(QObject::tr("Failed to open %1 for reading.").arg(fileName));
        return false;
    }

    QString replacement;
    QTextStream stream(&file);
    while (!stream.atEnd()) {
        const QString line = stream.readLine();
        if (line.trimmed().startsWith(searchString))
            replacement.append(replaceString + QLatin1String("\n"));
        else
            replacement.append(line + QLatin1String("\n"));
    }
    file.close();

    if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
        setError(UserDefinedError);
        setErrorString(QObject::tr("Failed to open %1 for writing.").arg(fileName));
        return false;
    }

    stream.setDevice(&file);
    stream << replacement;
    file.close();

    return true;
}

bool LineReplaceOperation::undoOperation()
{
    return true;
}

bool LineReplaceOperation::testOperation()
{
    return true;
}

Operation *LineReplaceOperation::clone() const
{
    return new LineReplaceOperation();
}