#include <QIcon>
#include <QPainter>

#include <KConfigCore/KSharedConfig>
#include <KConfigWidgets/KColorScheme>

QPixmap createPixmap(int size, const QBrush& window, const QBrush& button, const QBrush& view, const QBrush& selection);

extern "C" QIcon* createPreview(const QString& path) {
    KSharedConfigPtr schemeConfig = KSharedConfig::openConfig(path);
    QIcon* result = new QIcon();
    KColorScheme activeWindow(QPalette::Active, KColorScheme::Window, schemeConfig);
    KColorScheme activeButton(QPalette::Active, KColorScheme::Button, schemeConfig);
    KColorScheme activeView(QPalette::Active, KColorScheme::View, schemeConfig);
    KColorScheme activeSelection(QPalette::Active, KColorScheme::Selection, schemeConfig);

    result->addPixmap(createPixmap(16, activeWindow.background(), activeButton.background(), activeView.background(), activeSelection.background()));
    result->addPixmap(createPixmap(24, activeWindow.background(), activeButton.background(), activeView.background(), activeSelection.background()));

    return result;
}

extern "C" void deletePreview(QIcon* icon) {
    delete icon;
}

QPixmap createPixmap(int size, const QBrush& window, const QBrush& button, const QBrush& view, const QBrush& selection) {
    QPixmap pix(size, size);
    pix.fill(Qt::black);
    QPainter p;
    p.begin(&pix);
    const int itemSize = size / 2 - 1;
    p.fillRect(1, 1, itemSize, itemSize, window);
    p.fillRect(1 + itemSize, 1, itemSize, itemSize, button);
    p.fillRect(1, 1 + itemSize, itemSize, itemSize, view);
    p.fillRect(1 + itemSize, 1 + itemSize, itemSize, itemSize, selection);
    p.end();
    return pix;
}