/*

    This file is part of the KDE libraries

    SPDX-FileCopyrightText: 2007 Thiago Macieira <thiago@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later

*/

#include "kconfiggui_export.h"

#include <kconfiggroup.h>

#include <QColor>

#include <QDebug>

#include <QFont>

#include <kconfiggroup_p.h>

/*

 * Try to read a GUI type from config group cg at key key.

 * input is the default value and also indicates the type to be read.

 * output is to be set with the value that has been read.

 *

 * Returns true if something was handled (even if output was set to clear or default)

 *          or false if nothing was handled (e.g., Core type)

 */

static bool readEntryGui(const QByteArray &data, const char *key, const QVariant &input, QVariant &output)

{

    const auto errString = [&]() {

        return QStringLiteral("\"%1\" - conversion from \"%3\" to %2 failed")

            .arg(QLatin1String(key), QLatin1String(input.typeName()), QLatin1String(data.constData()));

    };

    // set in case of failure

    output = input;

    switch (static_cast<QMetaType::Type>(input.userType())) {

    case QMetaType::QColor: {

        if (data.isEmpty() || data == "invalid") {

            output = QColor(); // return what was stored

            return true;

        } else if (data.at(0) == '#') {

            QColor col = QColor::fromString(QUtf8StringView(data.constData(), data.length()));

            if (!col.isValid()) {

                qCritical() << qPrintable(errString());

            }

            output = col;

            return true;

        } else if (!data.contains(',')) {

            QColor col = QColor::fromString(QUtf8StringView(data.constData(), data.length()));

            if (!col.isValid()) {

                qCritical() << qPrintable(errString());

            }

            output = col;

            return true;

        } else {

            const QList<QByteArray> list = data.split(',');

            const int count = list.count();

            if (count != 3 && count != 4) {

                qCritical() //

                    << qPrintable(errString()) //

                    << qPrintable(QStringLiteral(" (wrong format: expected '%1' items, read '%2')").arg(QStringLiteral("3' or '4")).arg(count));

                return true; // return default

            }

            int temp[4];

            // bounds check components

            for (int i = 0; i < count; i++) {

                bool ok;

                const int j = temp[i] = list.at(i).toInt(&ok);

                if (!ok) { // failed to convert to int

                    qCritical() << qPrintable(errString()) << " (integer conversion failed)";

                    return true; // return default

                }

                if (j < 0 || j > 255) {

                    static const char *const components[] = {"red", "green", "blue", "alpha"};

                    qCritical() << qPrintable(errString())

                                << qPrintable(QStringLiteral(" (bounds error: %1 component %2)")

                                                  .arg(QLatin1String(components[i]), //

                                                       j < 0 ? QStringLiteral("< 0") : QStringLiteral("> 255")));

                    return true; // return default

                }

            }

            QColor aColor(temp[0], temp[1], temp[2]);

            if (count == 4) {

                aColor.setAlpha(temp[3]);

            }

            if (aColor.isValid()) {

                output = aColor;

            } else {

                qCritical() << qPrintable(errString());

            }

            return true;

        }

    }

    case QMetaType::QFont: {

        QVariant tmp = QString::fromUtf8(data.constData(), data.length());

        if (tmp.canConvert<QFont>()) {

            output = tmp;

        } else {

            qCritical() << qPrintable(errString());

        }

        return true;

    }

    case QMetaType::QPixmap:

    case QMetaType::QImage:

    case QMetaType::QBrush:

    case QMetaType::QPalette:

    case QMetaType::QIcon:

    case QMetaType::QRegion:

    case QMetaType::QBitmap:

    case QMetaType::QCursor:

    case QMetaType::QSizePolicy:

    case QMetaType::QPen:

        // we may want to handle these in the future

    default:

        break;

    }

    return false; // not handled

}

/*

 * Try to write a GUI type prop to config group cg at key key.

 *

 * Returns true if something was handled (even if an empty value was written)

 *          or false if nothing was handled (e.g., Core type)

 */

static bool writeEntryGui(KConfigGroup *cg, const char *key, const QVariant &prop, KConfigGroup::WriteConfigFlags pFlags)

{

    switch (static_cast<QMetaType::Type>(prop.userType())) {

    case QMetaType::QColor: {

        const QColor rColor = prop.value<QColor>();

        if (!rColor.isValid()) {

            cg->writeEntry(key, "invalid", pFlags);

            return true;

        }

        QList<int> list;

        list.insert(0, rColor.red());

        list.insert(1, rColor.green());

        list.insert(2, rColor.blue());

        if (rColor.alpha() != 255) {

            list.insert(3, rColor.alpha());

        }

        cg->writeEntry(key, list, pFlags);

        return true;

    }

    case QMetaType::QFont: {

        QFont f = prop.value<QFont>();

        // If the styleName property is set for a QFont, using setBold(true) would

        // lead to Qt using an "emboldended"/synthetic font style instead of using

        // the bold style provided by the font itself; the latter looks much better

        // than the former. For more details see:

        // https://bugreports.qt.io/browse/QTBUG-63792

        // https://bugs.kde.org/show_bug.cgi?id=378523

        /* clang-format off */

        if (f.weight() == QFont::Normal

            && (f.styleName() == QLatin1String("Regular")

                || f.styleName() == QLatin1String("Normal")

                || f.styleName() == QLatin1String("Book")

                || f.styleName() == QLatin1String("Roman"))) { /* clang-format on */

            f.setStyleName(QString());

        }

        cg->writeEntry(key, f.toString().toUtf8(), pFlags);

        return true;

    }

    case QMetaType::QPixmap:

    case QMetaType::QImage:

    case QMetaType::QBrush:

    case QMetaType::QPalette:

    case QMetaType::QIcon:

    case QMetaType::QRegion:

    case QMetaType::QBitmap:

    case QMetaType::QCursor:

    case QMetaType::QSizePolicy:

    case QMetaType::QPen:

        // we may want to handle one of these in the future

        break;

    default:

        break;

    }

    return false;

}

// Not static, because for static builds we use it in the kconfigguistaticinitializer.cpp file

// Exported as we need this to force linking in consumers that read GUI types from KConfig, but

// which are otherwise not using this library (and thus linking with --as-needed or MSVC would

// break things)

KCONFIGGUI_EXPORT int initKConfigGroupGui()

{

    _kde_internal_KConfigGroupGui.readEntryGui = readEntryGui;

    _kde_internal_KConfigGroupGui.writeEntryGui = writeEntryGui;

    return 42; // because 42 is nicer than 1 or 0

}

#ifdef Q_CONSTRUCTOR_FUNCTION

Q_CONSTRUCTOR_FUNCTION(initKConfigGroupGui)

#else

static int dummyKConfigGroupGui = initKConfigGroupGui();

#endif