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#include "setexamplespathonqtoperation.h"

#include "qtpatch.h"

#include <QtCore/QDir>
#include <QtCore/QSettings>
#include <QtCore/QDebug>

using namespace QInstaller;

SetExamplesPathOnQtOperation::SetExamplesPathOnQtOperation()
{
    setName(QLatin1String("SetExamplesPathOnQt"));
}

void SetExamplesPathOnQtOperation::backup()
{
}

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

    if (args.count() != 2) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments in %0: %1 arguments given, %2 expected%3.")
            .arg(name()).arg(arguments().count()).arg(tr("exactly 2"), QLatin1String("")));
        return false;
    }

    const QString qtDir = args.at(0);
    QByteArray newValue = QDir::toNativeSeparators(args.at(1)).toUtf8();

    QString qmakePath = qtDir + QLatin1String("/bin/qmake");
#ifdef Q_OS_WIN
    qmakePath = qmakePath + QLatin1String(".exe");
#endif

    QByteArray qmakeOutput;
    QHash<QString, QByteArray> qmakeValueHash = QtPatch::qmakeValues(qmakePath, &qmakeOutput);

    if (qmakeValueHash.isEmpty()) {
        setError(UserDefinedError);
        setErrorString(tr("The output of \n'%1 -query'\nis not parseable. Please file a bugreport with this "
            "dialog at https://bugreports.qt-project.org.\noutput: %2").arg(QDir::toNativeSeparators(qmakePath),
            QString::fromUtf8(qmakeOutput)));
        return false;
    }

    QByteArray oldValue = qmakeValueHash.value(QLatin1String("QT_INSTALL_EXAMPLES"));
    bool oldQtPathFromQMakeIsEmpty = oldValue.isEmpty();
    if (oldQtPathFromQMakeIsEmpty) {
        qDebug() << "qpatch: warning: It was not possible to get the old values from" << qmakePath;
    }

    if (newValue.size() >= 255) {
        setError(UserDefinedError);
        setErrorString(tr("Qt patch error: new Qt example path '%1'\nneeds to be less than 255 characters.")
            .arg(QString::fromLocal8Bit(newValue)));
        return false;
    }

    QString qtConfPath = qtDir + QLatin1String("/bin/qt.conf");

    if (QFile::exists(qtConfPath)) {
        QSettings settings(qtConfPath, QSettings::IniFormat);
        settings.setValue( QLatin1String("Paths/Examples"), QString::fromUtf8(newValue));
    }

    oldValue = QByteArray("qt_xmplpath=%1").replace("%1", oldValue);
    newValue = QByteArray("qt_xmplpath=%1").replace("%1", newValue);

    bool isPatched = QtPatch::patchBinaryFile(qmakePath, oldValue, newValue);
    if (!isPatched) {
        qDebug() << "qpatch: warning: could not patch the example path in" << qmakePath;
    }

    return true;
}

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

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

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