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#include "globalsettingsoperation.h"
#include "qsettingswrapper.h"

using namespace QInstaller;

GlobalSettingsOperation::GlobalSettingsOperation()
{
    setName(QLatin1String("GlobalConfig"));
}

void GlobalSettingsOperation::backup()
{
}

bool GlobalSettingsOperation::performOperation()
{
    QString key, value;
    QScopedPointer<QSettingsWrapper> settings(setup(&key, &value, arguments()));
    if (settings.isNull())
        return false;

    if (!settings->isWritable()) {
        setError(UserDefinedError);
        setErrorString(tr("Settings are not writable"));
        return false;
    }

    const QVariant oldValue = settings->value(key);
    settings->setValue(key, value);
    settings->sync();

    if (settings->status() != QSettingsWrapper::NoError) {
        setError(UserDefinedError);
        setErrorString(tr("Failed to write settings"));
        return false;
    }

    setValue(QLatin1String("oldvalue"), oldValue);
    return true;
}

bool GlobalSettingsOperation::undoOperation()
{
    QString key, val;
    QScopedPointer<QSettingsWrapper> settings(setup(&key, &val, arguments()));
    if (settings.isNull())
        return false;

    // be sure it's still our value and nobody changed it in between
    const QVariant oldValue = value(QLatin1String("oldvalue"));
    if (settings->value(key) == val) {
        // restore the previous state
        if (oldValue.isNull())
            settings->remove(key);
        else
            settings->setValue(key, oldValue);
    }

    return true;
}

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

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

QSettingsWrapper *GlobalSettingsOperation::setup(QString *key, QString *value, const QStringList &arguments)
{
    if (arguments.count() != 3 && arguments.count() != 4) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments in %0: %1 arguments given, %2 expected%3.")
            .arg(name()).arg(arguments.count()).arg(tr("3 or 4"), QLatin1String("")));
        return 0;
    }

    if (arguments.count() == 4) {
        const QString &company = arguments.at(0);
        const QString &application = arguments.at(1);
        *key = arguments.at(2);
        *value = arguments.at(3);
        return new QSettingsWrapper(company, application);
    } else if (arguments.count() == 3) {
        const QString &filename = arguments.at(0);
        *key = arguments.at(1);
        *value = arguments.at(2);
        return new QSettingsWrapper(filename, QSettingsWrapper::NativeFormat);
    }

    return 0;
}