#include "util/ThemeManager.hpp"

#include <QApplication>
#include <QFile>
#include <QLoggingCategory>
#include <QStyleHints>

namespace velox::gui {
namespace {

Q_LOGGING_CATEGORY(lcTheme, "velox.gui.theme")

QString loadQss(const QString &resourcePath) {
    QFile f(resourcePath);
    if (!f.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qCWarning(lcTheme, "could not load %s", qUtf8Printable(resourcePath));
        return {};
    }
    return QString::fromUtf8(f.readAll());
}

}  // namespace

ThemeManager::ThemeManager(QObject *parent) : QObject(parent) {
    connect(QGuiApplication::styleHints(), &QStyleHints::colorSchemeChanged, this,
            &ThemeManager::onColorSchemeChanged);
}

void ThemeManager::apply() {
    const bool dark = QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark;
    const QString qss =
        loadQss(dark ? QStringLiteral(":/qss/dark.qss") : QStringLiteral(":/qss/idm-like.qss"));
    if (!qss.isEmpty()) {
        qApp->setStyleSheet(qss);
    }
}

void ThemeManager::onColorSchemeChanged() {
    apply();
}

}  // namespace velox::gui