#include "../src/gui_language.h"
#include "../src/networksettingspage.h"
#include "../transport/node_config.h"
#include "../transport/config_updater.h"
#include "../../../lib/debug_config.h"

#include <QtTest>
#include <QComboBox>
#include <QDialogButtonBox>
#include <QPushButton>
#include <QFile>
#include <QTemporaryDir>
#include <QTranslator>
#include <QXmlStreamReader>
#include <QRegularExpression>

class GuiLanguageTest : public QObject {
    Q_OBJECT

private slots:
    void initTestCase() { debug_config_init(); }

    void systemPreference() {
        QCOMPARE(resolveGuiLanguage("system", {"ru-RU", "en-US"}), QString("ru"));
        QCOMPARE(resolveGuiLanguage("system", {"en-GB", "ru-RU"}), QString("en"));
        QCOMPARE(resolveGuiLanguage("system", {"de-DE", "ru_RU"}), QString("ru"));
        QCOMPARE(resolveGuiLanguage("system", {"fr-FR"}), QString("en"));
        QCOMPARE(resolveGuiLanguage("system", {}), QString("en"));
        QCOMPARE(resolveGuiLanguage("ru", {"en-US"}), QString("ru"));
        QCOMPARE(resolveGuiLanguage("en", {"ru-RU"}), QString("en"));
    }

    void preferencePersistence() {
        QTemporaryDir directory;
        QVERIFY(directory.isValid());
        const QString path = directory.filePath("vibechat.cfg");
        NodeConfig config(path);
        QVERIFY(config.create("Language test", 1333));
        QCOMPARE(config.language(), QString("system"));
        for (const QString& language : {QString("ru"), QString("en"), QString("system")}) {
            QVERIFY(config_update_option(path, "gui", "language", language));
            QVERIFY(config.load());
            QVERIFY2(!config.hasErrors(), qPrintable(config.errors().join('\n')));
            QCOMPARE(config.language(), language);
            QVERIFY(config.save());
            NodeConfig reloaded(path);
            QVERIFY(reloaded.load());
            QCOMPARE(reloaded.language(), language);
            QVERIFY(reloaded.saveFull());
            QVERIFY(reloaded.load());
            QCOMPARE(reloaded.language(), language);
        }
        QVERIFY(config_update_option(path, "gui", "language", "invalid"));
        QVERIFY(config.load());
        QCOMPARE(config.language(), QString("system"));
        QVERIFY(config_update_option(path, "gui", "language", "ru"));
        QVERIFY(config.load());
        QFile file(path);
        QVERIFY(file.open(QIODevice::WriteOnly | QIODevice::Truncate));
        const QByteArray minimalConfig("[gui]\ndb_path=chat_data\n");
        QCOMPARE(file.write(minimalConfig), qint64(minimalConfig.size()));
        file.close();
        QVERIFY(config.load());
        QCOMPARE(config.language(), QString("system"));
    }

    void embeddedCatalogs() {
        for (const QString& language : {QString("en"), QString("ru")}) {
            QTranslator translator;
            QVERIFY(translator.load(":/translations/chatgui_" + language + ".qm"));
            QVERIFY(qApp->installTranslator(&translator));
            QCOMPARE(QCoreApplication::translate("ChatGui", "Settings"), language == "ru" ? QString("Настройки") : QString("Settings"));
            QFile file(QStringLiteral(GUI_TS_DIR) + "/chatgui_" + language + ".ts");
            QVERIFY(file.open(QIODevice::ReadOnly));
            QXmlStreamReader xml(&file);
            QString source;
            int count = 0;
            const QRegularExpression placeholders("%(?:L?[1-9][0-9]?|n)");
            auto parameters = [&](const QString& text) {
                QStringList list;
                auto matches = placeholders.globalMatch(text);
                while (matches.hasNext()) list.append(matches.next().captured());
                list.sort();
                return list;
            };
            while (!xml.atEnd()) {
                xml.readNext();
                if (!xml.isStartElement()) continue;
                if (xml.name() == QLatin1String("source")) source = xml.readElementText();
                if (xml.name() != QLatin1String("translation")) continue;
                QVERIFY(!xml.attributes().hasAttribute("type"));
                const QString translation = xml.readElementText();
                QVERIFY2(!translation.isEmpty(), qPrintable(source));
                QCOMPARE(parameters(translation), parameters(source));
                QCOMPARE(QCoreApplication::translate("ChatGui", source.toUtf8().constData()), translation);
                if (language == "en") QCOMPARE(translation, source);
                count++;
            }
            QVERIFY2(!xml.hasError(), qPrintable(xml.errorString()));
            QVERIFY(count > 0);
            qApp->removeTranslator(&translator);
        }
    }

    void standardButtons() {
        QTranslator translator;
        QVERIFY(translator.load(":/translations/qtbase_ru.qm"));
        QVERIFY(qApp->installTranslator(&translator));
        QDialogButtonBox buttons(QDialogButtonBox::Cancel | QDialogButtonBox::Save);
        QCOMPARE(buttons.button(QDialogButtonBox::Cancel)->text().remove('&'), QString("Отмена"));
        QCOMPARE(buttons.button(QDialogButtonBox::Save)->text().remove('&'), QString("Сохранить"));
        qApp->removeTranslator(&translator);
    }

    void translatedNetworkValues_data() {
        QTest::addColumn<QString>("language");
        QTest::newRow("English") << QString("en");
        QTest::newRow("Russian") << QString("ru");
    }

    void translatedNetworkValues() {
        QFETCH(QString, language);
        QTranslator translator;
        QVERIFY(translator.load(":/translations/chatgui_" + language + ".qm"));
        QVERIFY(qApp->installTranslator(&translator));
        QTemporaryDir directory;
        QVERIFY(directory.isValid());
        const QString path = directory.filePath("vibechat.cfg");
        QVERIFY(config_rewrite_servers(path, {{"test", "0.0.0.0:1333", "tcp", "private", ""}}));
        NetworkSettingsPage page;
        page.loadFromConfig(path);
        QComboBox* type = nullptr;
        for (auto* combo : page.findChildren<QComboBox*>()) {
            if (combo->findData(QString("public")) >= 0) type = combo;
        }
        QVERIFY(type);
        QCOMPARE(type->currentData().toString(), QString("private"));
        QCOMPARE(type->currentText(), language == "ru" ? QString("Частный") : QString("Private"));
        type->setCurrentIndex(type->findData(QString("local")));
        page.saveToConfig(path);
        QFile file(path);
        QVERIFY(file.open(QIODevice::ReadOnly));
        const QByteArray content = file.readAll();
        QVERIFY(content.contains("type=local\n"));
        QVERIFY(content.contains("addr=0.0.0.0:1333\n"));
        QVERIFY(content.contains("transport=tcp\n"));
        QVERIFY(!content.contains("netif="));
        qApp->removeTranslator(&translator);
    }
};

QTEST_MAIN(GuiLanguageTest)
#include "test_gui_language.moc"