#include "translationloader.h"
#include <QCoreApplication>
#include <QDebug>

TranslationLoader::TranslationLoader(const QQmlApplicationEngine *engine,
                                     const QString filename,
                                     const QString translationsDirectory,
                                     QObject *parent)
    : QObject{parent}
    , engine(engine)
    , filename(filename)
    , translationsDirectory(translationsDirectory)
{
    QObject::connect(engine,
                     &QJSEngine::uiLanguageChanged,
                     this,
                     &TranslationLoader::_q_loadTranslations);
    _q_loadTranslations();
}

void TranslationLoader::_q_loadTranslations()
{
    if (translationsDirectory.isEmpty())
        return;

    auto uiLanguage = engine->uiLanguage();
    auto translator = std::make_unique<QTranslator>();
    if (!uiLanguage.isEmpty()) {
        QLocale locale(uiLanguage);
        if (translator->load(locale,
                             filename,
                             QLatin1String("_"),
                             translationsDirectory,
                             QLatin1String(".qm"))) {
            if (activeTranslator)
                QCoreApplication::removeTranslator(activeTranslator.get());
            QCoreApplication::installTranslator(translator.get());
            activeTranslator.swap(translator);
        } else {
            qWarning() << "TranslationLoader: failed to load";
        }
    } else {
        activeTranslator.reset();
    }

    const_cast<QQmlApplicationEngine *>(engine)->retranslate();
}