/*
 * This file is part of smolbote. It's copyrighted by the contributors recorded
 * in the version control history of the file, available from its original
 * location: https://neueland.iserlohn-fortress.net/gitea/aqua/smolbote
 *
 * SPDX-License-Identifier: GPL-3.0
 */

#ifndef SMOLBOTE_UTIL_H
#define SMOLBOTE_UTIL_H

#include "poi_icons.h"
#include "poi_logos.h"
#include <QIcon>
#include <QPainter>
#include <QStringList>
#include <QStyle>
#include <QSvgRenderer>

namespace Util {

const QStringList files(const QString &location, const QStringList &nameFilters = QStringList());

constexpr auto AppIcon = QStyle::SP_CustomBase + 1;
constexpr auto AppWindowIcon = QStyle::SP_CustomBase + 2;

[[nodiscard]] inline QPixmap render(const auto &data, const QSize size = QSize())
{
    QSvgRenderer renderer;
    renderer.load(QByteArray(data.data(), static_cast<int>(data.size())));

    QPixmap pm(size.isValid() ? size : renderer.defaultSize());
    pm.fill(Qt::transparent);

    QPainter painter(&pm);
    renderer.render(&painter, pm.rect());

    return pm;
}

template </*QStyle::StandardPixmap*/ unsigned int id>
inline QIcon icon()
{
    using namespace std::literals;

    if constexpr(id >= QStyle::SP_CustomBase) {
        constexpr auto data = logos::get([] {
            switch(id) {
            case AppIcon:
                return "poi.svg"sv;
            case AppWindowIcon:
                return "poi_window.svg"sv;
            default:
                return "__unknown__"sv;
            }
        });
        return QIcon(render(data));
    } else {

        constexpr auto data = icons::get([] {
            switch(id) {
            case QStyle::SP_ArrowBack:
                return "arrow-left.svg"sv;
            case QStyle::SP_ArrowForward:
                return "arrow-right.svg"sv;
            case QStyle::SP_BrowserStop:
                return "circle-x.svg"sv;
            case QStyle::SP_BrowserReload:
                return "refresh.svg"sv;
            case QStyle::SP_DirHomeIcon:
                return "home.svg"sv;
            default:
                return "__unknown__"sv;
            }
        });

        QIcon m;
        // This is a horrible hack that will one day be hopefully fixed:
        // When rendering an svg, you can't actually pick a stroke color through
        // QPainter::setBrush or QPainter::setPen. So instead, replace the stroke
        // color in the data (stroke="currentColor") and then rerender it.

        QByteArray arr(data.data(), data.size());
        for(const auto mode : { QIcon::Normal /*, QIcon::Disabled, QIcon::Active, QIcon::Selected*/ }) {
            for(const auto toggle : { QIcon::On, QIcon::Off }) {
                const auto pm = render(arr.replace("currentColor", (toggle == QIcon::On ? "black" : "gray")));
                m.addPixmap(pm, mode, toggle);
            }
        }
        return m;
    }
}
} // namespace Util

#endif // SMOLBOTE_UTIL_H