// Copyright (c) 2011-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <config/bitcoin-config.h> // IWYU pragma: keep

#include <qt/bitcoin.h>

#include <chainparams.h>
#include <common/args.h>
#include <common/init.h>
#include <common/system.h>
#include <init.h>
#include <interfaces/handler.h>
#include <interfaces/init.h>
#include <interfaces/node.h>
#include <logging.h>
#include <node/context.h>
#include <node/interface_ui.h>
#include <noui.h>
#include <qt/bitcoingui.h>
#include <qt/clientmodel.h>
#include <qt/guiconstants.h>
#include <qt/guiutil.h>
#include <qt/initexecutor.h>
#include <qt/intro.h>
#include <qt/networkstyle.h>
#include <qt/optionsmodel.h>
#include <qt/platformstyle.h>
#include <qt/splashscreen.h>
#include <qt/utilitydialog.h>
#include <qt/winshutdownmonitor.h>
#include <uint256.h>
#include <util/exception.h>
#include <util/string.h>
#include <util/threadnames.h>
#include <util/translation.h>
#include <validation.h>

#ifdef ENABLE_WALLET
#include <qt/paymentserver.h>
#include <qt/walletcontroller.h>
#include <qt/walletmodel.h>
#include <wallet/types.h>
#endif // ENABLE_WALLET

#include <boost/signals2/connection.hpp>
#include <chrono>
#include <memory>

#include <QApplication>
#include <QDebug>
#include <QLatin1String>
#include <QLibraryInfo>
#include <QLocale>
#include <QMessageBox>
#include <QSettings>
#include <QThread>
#include <QTimer>
#include <QTranslator>
#include <QWindow>

#if defined(QT_STATICPLUGIN)
#include <QtPlugin>
#if defined(QT_QPA_PLATFORM_XCB)
Q_IMPORT_PLUGIN(QXcbIntegrationPlugin);
#elif defined(QT_QPA_PLATFORM_WINDOWS)
Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin);
Q_IMPORT_PLUGIN(QWindowsVistaStylePlugin);
#elif defined(QT_QPA_PLATFORM_COCOA)
Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin);
Q_IMPORT_PLUGIN(QMacStylePlugin);
#elif defined(QT_QPA_PLATFORM_ANDROID)
Q_IMPORT_PLUGIN(QAndroidPlatformIntegrationPlugin)
#endif
#endif

// Declare meta types used for QMetaObject::invokeMethod
Q_DECLARE_METATYPE(bool*)
Q_DECLARE_METATYPE(CAmount)
Q_DECLARE_METATYPE(SynchronizationState)
Q_DECLARE_METATYPE(SyncType)
Q_DECLARE_METATYPE(uint256)
#ifdef ENABLE_WALLET
Q_DECLARE_METATYPE(wallet::AddressPurpose)
#endif // ENABLE_WALLET

using util::MakeUnorderedList;

static void RegisterMetaTypes()
{
    // Register meta types used for QMetaObject::invokeMethod and Qt::QueuedConnection
    qRegisterMetaType<bool*>();
    qRegisterMetaType<SynchronizationState>();
    qRegisterMetaType<SyncType>();
  #ifdef ENABLE_WALLET
    qRegisterMetaType<WalletModel*>();
    qRegisterMetaType<wallet::AddressPurpose>();
  #endif // ENABLE_WALLET
    // Register typedefs (see https://doc.qt.io/qt-5/qmetatype.html#qRegisterMetaType)
    // IMPORTANT: if CAmount is no longer a typedef use the normal variant above (see https://doc.qt.io/qt-5/qmetatype.html#qRegisterMetaType-1)
    qRegisterMetaType<CAmount>("CAmount");
    qRegisterMetaType<size_t>("size_t");

    qRegisterMetaType<std::function<void()>>("std::function<void()>");
    qRegisterMetaType<QMessageBox::Icon>("QMessageBox::Icon");
    qRegisterMetaType<interfaces::BlockAndHeaderTipInfo>("interfaces::BlockAndHeaderTipInfo");

#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
    qRegisterMetaTypeStreamOperators<BitcoinUnit>("BitcoinUnit");
#else
    qRegisterMetaType<BitcoinUnit>("BitcoinUnit");
#endif
}

static QString GetLangTerritory()
{
    QSettings settings;
    // Get desired locale (e.g. "de_DE")
    // 1) System default language
    QString lang_territory = QLocale::system().name();
    // 2) Language from QSettings
    QString lang_territory_qsettings = settings.value("language", "").toString();
    if(!lang_territory_qsettings.isEmpty())
        lang_territory = lang_territory_qsettings;
    // 3) -lang command line argument
    lang_territory = QString::fromStdString(gArgs.GetArg("-lang", lang_territory.toStdString()));
    return lang_territory;
}

/** Set up translations */
static void initTranslations(QTranslator &qtTranslatorBase, QTranslator &qtTranslator, QTranslator &translatorBase, QTranslator &translator)
{
    // Remove old translators
    QApplication::removeTranslator(&qtTranslatorBase);
    QApplication::removeTranslator(&qtTranslator);
    QApplication::removeTranslator(&translatorBase);
    QApplication::removeTranslator(&translator);

    // Get desired locale (e.g. "de_DE")
    // 1) System default language
    QString lang_territory = GetLangTerritory();

    // Convert to "de" only by truncating "_DE"
    QString lang = lang_territory;
    lang.truncate(lang_territory.lastIndexOf('_'));

    // Load language files for configured locale:
    // - First load the translator for the base language, without territory
    // - Then load the more specific locale translator

#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
    const QString translation_path{QLibraryInfo::location(QLibraryInfo::TranslationsPath)};
#else
    const QString translation_path{QLibraryInfo::path(QLibraryInfo::TranslationsPath)};
#endif
    // Load e.g. qt_de.qm
    if (qtTranslatorBase.load("qt_" + lang, translation_path)) {
        QApplication::installTranslator(&qtTranslatorBase);
    }

    // Load e.g. qt_de_DE.qm
    if (qtTranslator.load("qt_" + lang_territory, translation_path)) {
        QApplication::installTranslator(&qtTranslator);
    }

    // Load e.g. bitcoin_de.qm (shortcut "de" needs to be defined in bitcoin.qrc)
    if (translatorBase.load(lang, ":/translations/")) {
        QApplication::installTranslator(&translatorBase);
    }

    // Load e.g. bitcoin_de_DE.qm (shortcut "de_DE" needs to be defined in bitcoin.qrc)
    if (translator.load(lang_territory, ":/translations/")) {
        QApplication::installTranslator(&translator);
    }
}

static bool ErrorSettingsRead(const bilingual_str& error, const std::vector<std::string>& details)
{
    QMessageBox messagebox(QMessageBox::Critical, PACKAGE_NAME, QString::fromStdString(strprintf("%s.", error.translated)), QMessageBox::Reset | QMessageBox::Abort);
    /*: Explanatory text shown on startup when the settings file cannot be read.
      Prompts user to make a choice between resetting or aborting. */
    messagebox.setInformativeText(QObject::tr("Do you want to reset settings to default values, or to abort without making changes?"));
    messagebox.setDetailedText(QString::fromStdString(MakeUnorderedList(details)));
    messagebox.setTextFormat(Qt::PlainText);
    messagebox.setDefaultButton(QMessageBox::Reset);
    switch (messagebox.exec()) {
    case QMessageBox::Reset:
        return false;
    case QMessageBox::Abort:
        return true;
    default:
        assert(false);
    }
}

static void ErrorSettingsWrite(const bilingual_str& error, const std::vector<std::string>& details)
{
    QMessageBox messagebox(QMessageBox::Critical, PACKAGE_NAME, QString::fromStdString(strprintf("%s.", error.translated)), QMessageBox::Ok);
    /*: Explanatory text shown on startup when the settings file could not be written.
        Prompts user to check that we have the ability to write to the file.
        Explains that the user has the option of running without a settings file.*/
    messagebox.setInformativeText(QObject::tr("A fatal error occurred. Check that settings file is writable, or try running with -nosettings."));
    messagebox.setDetailedText(QString::fromStdString(MakeUnorderedList(details)));
    messagebox.setTextFormat(Qt::PlainText);
    messagebox.setDefaultButton(QMessageBox::Ok);
    messagebox.exec();
}

/* qDebug() message handler --> debug.log */
void DebugMessageHandler(QtMsgType type, const QMessageLogContext& context, const QString &msg)
{
    Q_UNUSED(context);
    if (type == QtDebugMsg) {
        LogPrint(BCLog::QT, "GUI: %s\n", msg.toStdString());
    } else {
        LogPrintf("GUI: %s\n", msg.toStdString());
    }
}

static int qt_argc = 1;
static const char* qt_argv = "bitcoin-qt";

BitcoinApplication::BitcoinApplication()
    : QApplication(qt_argc, const_cast<char**>(&qt_argv))
{
    // Qt runs setlocale(LC_ALL, "") on initialization.
    RegisterMetaTypes();
    setQuitOnLastWindowClosed(false);
}

void BitcoinApplication::setupPlatformStyle()
{
    // UI per-platform customization
    // This must be done inside the BitcoinApplication constructor, or after it, because
    // PlatformStyle::instantiate requires a QApplication
    std::string platformName;
    platformName = gArgs.GetArg("-uiplatform", BitcoinGUI::DEFAULT_UIPLATFORM);
    platformStyle = PlatformStyle::instantiate(QString::fromStdString(platformName));
    if (!platformStyle) // Fall back to "other" if specified name not found
        platformStyle = PlatformStyle::instantiate("other");
    assert(platformStyle);
}

BitcoinApplication::~BitcoinApplication()
{
    m_executor.reset();

    delete window;
    window = nullptr;
    delete platformStyle;
    platformStyle = nullptr;
}

#ifdef ENABLE_WALLET
void BitcoinApplication::createPaymentServer()
{
    paymentServer = new PaymentServer(this);
}
#endif

bool BitcoinApplication::createOptionsModel(bool resetSettings)
{
    optionsModel = new OptionsModel(node(), this);
    if (resetSettings) {
        optionsModel->Reset();
    }
    bilingual_str error;
    if (!optionsModel->Init(error)) {
        fs::path settings_path;
        if (gArgs.GetSettingsPath(&settings_path)) {
            error += Untranslated("\n");
            std::string quoted_path = strprintf("%s", fs::quoted(fs::PathToString(settings_path)));
            error.original += strprintf("Settings file %s might be corrupt or invalid.", quoted_path);
            error.translated += tr("Settings file %1 might be corrupt or invalid.").arg(QString::fromStdString(quoted_path)).toStdString();
        }
        InitError(error);
        QMessageBox::critical(nullptr, PACKAGE_NAME, QString::fromStdString(error.translated));
        return false;
    }
    return true;
}

void BitcoinApplication::createWindow(const NetworkStyle *networkStyle)
{
    window = new BitcoinGUI(node(), platformStyle, networkStyle, nullptr);
    connect(window, &BitcoinGUI::quitRequested, this, &BitcoinApplication::requestShutdown);

    pollShutdownTimer = new QTimer(window);
    connect(pollShutdownTimer, &QTimer::timeout, [this]{
        if (!QApplication::activeModalWidget()) {
            window->detectShutdown();
        }
    });
}

void BitcoinApplication::createSplashScreen(const NetworkStyle *networkStyle)
{
    assert(!m_splash);
    m_splash = new SplashScreen(networkStyle);
    m_splash->show();
}

void BitcoinApplication::createNode(interfaces::Init& init)
{
    assert(!m_node);
    m_node = init.makeNode();
    if (m_splash) m_splash->setNode(*m_node);
}

bool BitcoinApplication::baseInitialize()
{
    return node().baseInitialize();
}

void BitcoinApplication::startThread()
{
    assert(!m_executor);
    m_executor.emplace(node());

    /*  communication to and from thread */
    connect(&m_executor.value(), &InitExecutor::initializeResult, this, &BitcoinApplication::initializeResult);
    connect(&m_executor.value(), &InitExecutor::shutdownResult, this, [] {
        QCoreApplication::exit(0);
    });
    connect(&m_executor.value(), &InitExecutor::runawayException, this, &BitcoinApplication::handleRunawayException);
    connect(this, &BitcoinApplication::requestedInitialize, &m_executor.value(), &InitExecutor::initialize);
    connect(this, &BitcoinApplication::requestedShutdown, &m_executor.value(), &InitExecutor::shutdown);
}

void BitcoinApplication::parameterSetup()
{
    // Default printtoconsole to false for the GUI. GUI programs should not
    // print to the console unnecessarily.
    gArgs.SoftSetBoolArg("-printtoconsole", false);

    InitLogging(gArgs);
    InitParameterInteraction(gArgs);
}

void BitcoinApplication::InitPruneSetting(int64_t prune_MiB)
{
    optionsModel->SetPruneTargetGB(PruneMiBtoGB(prune_MiB));
}

void BitcoinApplication::requestInitialize()
{
    qDebug() << __func__ << ": Requesting initialize";
    startThread();
    Q_EMIT requestedInitialize();
}

void BitcoinApplication::requestShutdown()
{
    for (const auto w : QGuiApplication::topLevelWindows()) {
        w->hide();
    }

    delete m_splash;
    m_splash = nullptr;

    // Show a simple window indicating shutdown status
    // Do this first as some of the steps may take some time below,
    // for example the RPC console may still be executing a command.
    shutdownWindow.reset(ShutdownWindow::showShutdownWindow(window));

    qDebug() << __func__ << ": Requesting shutdown";

    // Must disconnect node signals otherwise current thread can deadlock since
    // no event loop is running.
    window->unsubscribeFromCoreSignals();
    // Request node shutdown, which can interrupt long operations, like
    // rescanning a wallet.
    node().startShutdown();
    // Prior to unsetting the client model, stop listening backend signals
    if (clientModel) {
        clientModel->stop();
    }

    // Unsetting the client model can cause the current thread to wait for node
    // to complete an operation, like wait for a RPC execution to complete.
    window->setClientModel(nullptr);
    pollShutdownTimer->stop();

#ifdef ENABLE_WALLET
    // Delete wallet controller here manually, instead of relying on Qt object
    // tracking (https://doc.qt.io/qt-5/objecttrees.html). This makes sure
    // walletmodel m_handle_* notification handlers are deleted before wallets
    // are unloaded, which can simplify wallet implementations. It also avoids
    // these notifications having to be handled while GUI objects are being
    // destroyed, making GUI code less fragile as well.
    delete m_wallet_controller;
    m_wallet_controller = nullptr;
#endif // ENABLE_WALLET

    delete clientModel;
    clientModel = nullptr;

    // Request shutdown from core thread
    Q_EMIT requestedShutdown();
}

void BitcoinApplication::initializeResult(bool success, interfaces::BlockAndHeaderTipInfo tip_info)
{
    qDebug() << __func__ << ": Initialization result: " << success;

    if (success) {
        delete m_splash;
        m_splash = nullptr;

        // Log this only after AppInitMain finishes, as then logging setup is guaranteed complete
        qInfo() << "Platform customization:" << platformStyle->getName();
        clientModel = new ClientModel(node(), optionsModel);
        window->setClientModel(clientModel, &tip_info);

        // If '-min' option passed, start window minimized (iconified) or minimized to tray
        bool start_minimized = gArgs.GetBoolArg("-min", false);
#ifdef ENABLE_WALLET
        if (WalletModel::isWalletEnabled()) {
            m_wallet_controller = new WalletController(*clientModel, platformStyle, this);
            window->setWalletController(m_wallet_controller, /*show_loading_minimized=*/start_minimized);
            if (paymentServer) {
                paymentServer->setOptionsModel(optionsModel);
            }
        }
#endif // ENABLE_WALLET

        // Show or minimize window
        if (!start_minimized) {
            window->show();
        } else if (clientModel->getOptionsModel()->getMinimizeToTray() && window->hasTrayIcon()) {
            // do nothing as the window is managed by the tray icon
        } else {
            window->showMinimized();
        }
        Q_EMIT windowShown(window);

#ifdef ENABLE_WALLET
        // Now that initialization/startup is done, process any command-line
        // bitcoin: URIs or payment requests:
        if (paymentServer) {
            connect(paymentServer, &PaymentServer::receivedPaymentRequest, window, &BitcoinGUI::handlePaymentRequest);
            connect(window, &BitcoinGUI::receivedURI, paymentServer, &PaymentServer::handleURIOrFile);
            connect(paymentServer, &PaymentServer::message, [this](const QString& title, const QString& message, unsigned int style) {
                window->message(title, message, style);
            });
            QTimer::singleShot(100ms, paymentServer, &PaymentServer::uiReady);
        }
#endif
        pollShutdownTimer->start(SHUTDOWN_POLLING_DELAY);
    } else {
        requestShutdown();
    }
}

void BitcoinApplication::handleRunawayException(const QString &message)
{
    QMessageBox::critical(
        nullptr, tr("Runaway exception"),
        tr("A fatal error occurred. %1 can no longer continue safely and will quit.").arg(PACKAGE_NAME) +
        QLatin1String("<br><br>") + GUIUtil::MakeHtmlLink(message, PACKAGE_BUGREPORT));
    ::exit(EXIT_FAILURE);
}

void BitcoinApplication::handleNonFatalException(const QString& message)
{
    assert(QThread::currentThread() == thread());
    QMessageBox::warning(
        nullptr, tr("Internal error"),
        tr("An internal error occurred. %1 will attempt to continue safely. This is "
           "an unexpected bug which can be reported as described below.").arg(PACKAGE_NAME) +
        QLatin1String("<br><br>") + GUIUtil::MakeHtmlLink(message, PACKAGE_BUGREPORT));
}

WId BitcoinApplication::getMainWinId() const
{
    if (!window)
        return 0;

    return window->winId();
}

bool BitcoinApplication::event(QEvent* e)
{
    if (e->type() == QEvent::Quit) {
        requestShutdown();
        return true;
    }

    return QApplication::event(e);
}

static void SetupUIArgs(ArgsManager& argsman)
{
    argsman.AddArg("-choosedatadir", strprintf("Choose data directory on startup (default: %u)", DEFAULT_CHOOSE_DATADIR), ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
    argsman.AddArg("-lang=<lang>", "Set language, for example \"de_DE\" (default: system locale)", ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
    argsman.AddArg("-min", "Start minimized", ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
    argsman.AddArg("-resetguisettings", "Reset all settings changed in the GUI", ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
    argsman.AddArg("-splash", strprintf("Show splash screen on startup (default: %u)", DEFAULT_SPLASHSCREEN), ArgsManager::ALLOW_ANY, OptionsCategory::GUI);
    argsman.AddArg("-uiplatform", strprintf("Select platform to customize UI for (one of windows, macosx, other; default: %s)", BitcoinGUI::DEFAULT_UIPLATFORM), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::GUI);
}

int GuiMain(int argc, char* argv[])
{
#ifdef WIN32
    common::WinCmdLineArgs winArgs;
    std::tie(argc, argv) = winArgs.get();
#endif

    std::unique_ptr<interfaces::Init> init = interfaces::MakeGuiInit(argc, argv);

    SetupEnvironment();
    util::ThreadSetInternalName("main");

    // Subscribe to global signals from core
    boost::signals2::scoped_connection handler_message_box = ::uiInterface.ThreadSafeMessageBox_connect(noui_ThreadSafeMessageBox);
    boost::signals2::scoped_connection handler_question = ::uiInterface.ThreadSafeQuestion_connect(noui_ThreadSafeQuestion);
    boost::signals2::scoped_connection handler_init_message = ::uiInterface.InitMessage_connect(noui_InitMessage);

    // Do not refer to data directory yet, this can be overridden by Intro::pickDataDirectory

    /// 1. Basic Qt initialization (not dependent on parameters or configuration)
    Q_INIT_RESOURCE(bitcoin);
    Q_INIT_RESOURCE(bitcoin_locale);

#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
    // Generate high-dpi pixmaps
    QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif

#if defined(QT_QPA_PLATFORM_ANDROID)
    QApplication::setAttribute(Qt::AA_DontUseNativeMenuBar);
    QApplication::setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
    QApplication::setAttribute(Qt::AA_DontUseNativeDialogs);
#endif

    BitcoinApplication app;
    GUIUtil::LoadFont(QStringLiteral(":/fonts/monospace"));

    /// 2. Parse command-line options. We do this after qt in order to show an error if there are problems parsing these
    // Command-line options take precedence:
    SetupServerArgs(gArgs);
    SetupUIArgs(gArgs);
    std::string error;
    if (!gArgs.ParseParameters(argc, argv, error)) {
        InitError(strprintf(Untranslated("Error parsing command line arguments: %s"), error));
        // Create a message box, because the gui has neither been created nor has subscribed to core signals
        QMessageBox::critical(nullptr, PACKAGE_NAME,
            // message cannot be translated because translations have not been initialized
            QString::fromStdString("Error parsing command line arguments: %1.").arg(QString::fromStdString(error)));
        return EXIT_FAILURE;
    }

    // Error out when loose non-argument tokens are encountered on command line
    // However, allow BIP-21 URIs only if no options follow
    bool payment_server_token_seen = false;
    for (int i = 1; i < argc; i++) {
        QString arg(argv[i]);
        bool invalid_token = !arg.startsWith("-");
#ifdef ENABLE_WALLET
        if (arg.startsWith(BITCOIN_IPC_PREFIX, Qt::CaseInsensitive)) {
            invalid_token &= false;
            payment_server_token_seen = true;
        }
#endif
        if (payment_server_token_seen && arg.startsWith("-")) {
            InitError(Untranslated(strprintf("Options ('%s') cannot follow a BIP-21 payment URI", argv[i])));
            QMessageBox::critical(nullptr, PACKAGE_NAME,
                                  // message cannot be translated because translations have not been initialized
                                  QString::fromStdString("Options ('%1') cannot follow a BIP-21 payment URI").arg(QString::fromStdString(argv[i])));
            return EXIT_FAILURE;
        }
        if (invalid_token) {
            InitError(Untranslated(strprintf("Command line contains unexpected token '%s', see bitcoin-qt -h for a list of options.", argv[i])));
            QMessageBox::critical(nullptr, PACKAGE_NAME,
                                  // message cannot be translated because translations have not been initialized
                                  QString::fromStdString("Command line contains unexpected token '%1', see bitcoin-qt -h for a list of options.").arg(QString::fromStdString(argv[i])));
            return EXIT_FAILURE;
        }
    }

    // Now that the QApplication is setup and we have parsed our parameters, we can set the platform style
    app.setupPlatformStyle();

    /// 3. Application identification
    // must be set before OptionsModel is initialized or translations are loaded,
    // as it is used to locate QSettings
    QApplication::setOrganizationName(QAPP_ORG_NAME);
    QApplication::setOrganizationDomain(QAPP_ORG_DOMAIN);
    QApplication::setApplicationName(QAPP_APP_NAME_DEFAULT);

    /// 4. Initialization of translations, so that intro dialog is in user's language
    // Now that QSettings are accessible, initialize translations
    QTranslator qtTranslatorBase, qtTranslator, translatorBase, translator;
    initTranslations(qtTranslatorBase, qtTranslator, translatorBase, translator);

    // Show help message immediately after parsing command-line options (for "-lang") and setting locale,
    // but before showing splash screen.
    if (HelpRequested(gArgs) || gArgs.IsArgSet("-version")) {
        HelpMessageDialog help(nullptr, gArgs.IsArgSet("-version"));
        help.showOrPrint();
        return EXIT_SUCCESS;
    }

    // Install global event filter that makes sure that long tooltips can be word-wrapped
    app.installEventFilter(new GUIUtil::ToolTipToRichTextFilter(TOOLTIP_WRAP_THRESHOLD, &app));

    /// 5. Now that settings and translations are available, ask user for data directory
    // User language is set up: pick a data directory
    bool did_show_intro = false;
    int64_t prune_MiB = 0;  // Intro dialog prune configuration
    // Gracefully exit if the user cancels
    if (!Intro::showIfNeeded(did_show_intro, prune_MiB)) return EXIT_SUCCESS;

    /// 6-7. Parse bitcoin.conf, determine network, switch to network specific
    /// options, and create datadir and settings.json.
    // - Do not call gArgs.GetDataDirNet() before this step finishes
    // - Do not call Params() before this step
    // - QSettings() will use the new application name after this, resulting in network-specific settings
    // - Needs to be done before createOptionsModel
    if (auto error = common::InitConfig(gArgs, ErrorSettingsRead)) {
        InitError(error->message, error->details);
        if (error->status == common::ConfigStatus::FAILED_WRITE) {
            // Show a custom error message to provide more information in the
            // case of a datadir write error.
            ErrorSettingsWrite(error->message, error->details);
        } else if (error->status != common::ConfigStatus::ABORTED) {
            // Show a generic message in other cases, and no additional error
            // message in the case of a read error if the user decided to abort.
            QMessageBox::critical(nullptr, PACKAGE_NAME, QObject::tr("Error: %1").arg(QString::fromStdString(error->message.translated)));
        }
        return EXIT_FAILURE;
    }
#ifdef ENABLE_WALLET
    // Parse URIs on command line
    PaymentServer::ipcParseCommandLine(argc, argv);
#endif

    QScopedPointer<const NetworkStyle> networkStyle(NetworkStyle::instantiate(Params().GetChainType()));
    assert(!networkStyle.isNull());
    // Allow for separate UI settings for testnets
    QApplication::setApplicationName(networkStyle->getAppName());
    // Re-initialize translations after changing application name (language in network-specific settings can be different)
    initTranslations(qtTranslatorBase, qtTranslator, translatorBase, translator);

#ifdef ENABLE_WALLET
    /// 8. URI IPC sending
    // - Do this early as we don't want to bother initializing if we are just calling IPC
    // - Do this *after* setting up the data directory, as the data directory hash is used in the name
    // of the server.
    // - Do this after creating app and setting up translations, so errors are
    // translated properly.
    if (PaymentServer::ipcSendCommandLine())
        exit(EXIT_SUCCESS);

    // Start up the payment server early, too, so impatient users that click on
    // bitcoin: links repeatedly have their payment requests routed to this process:
    if (WalletModel::isWalletEnabled()) {
        app.createPaymentServer();
    }
#endif // ENABLE_WALLET

    /// 9. Main GUI initialization
    // Install global event filter that makes sure that out-of-focus labels do not contain text cursor.
    app.installEventFilter(new GUIUtil::LabelOutOfFocusEventFilter(&app));
#if defined(Q_OS_WIN)
    // Install global event filter for processing Windows session related Windows messages (WM_QUERYENDSESSION and WM_ENDSESSION)
    // Note: it is safe to call app.node() in the lambda below despite the fact
    // that app.createNode() hasn't been called yet, because native events will
    // not be processed until the Qt event loop is executed.
    qApp->installNativeEventFilter(new WinShutdownMonitor([&app] { app.node().startShutdown(); }));
#endif
    // Install qDebug() message handler to route to debug.log
    qInstallMessageHandler(DebugMessageHandler);
    // Allow parameter interaction before we create the options model
    app.parameterSetup();
    GUIUtil::LogQtInfo();

    if (gArgs.GetBoolArg("-splash", DEFAULT_SPLASHSCREEN) && !gArgs.GetBoolArg("-min", false))
        app.createSplashScreen(networkStyle.data());

    app.createNode(*init);

    // Load GUI settings from QSettings
    if (!app.createOptionsModel(gArgs.GetBoolArg("-resetguisettings", false))) {
        return EXIT_FAILURE;
    }

    if (did_show_intro) {
        // Store intro dialog settings other than datadir (network specific)
        app.InitPruneSetting(prune_MiB);
    }

    try
    {
        app.createWindow(networkStyle.data());
        // Perform base initialization before spinning up initialization/shutdown thread
        // This is acceptable because this function only contains steps that are quick to execute,
        // so the GUI thread won't be held up.
        if (app.baseInitialize()) {
            app.requestInitialize();
#if defined(Q_OS_WIN)
            WinShutdownMonitor::registerShutdownBlockReason(QObject::tr("%1 didn't yet exit safely…").arg(PACKAGE_NAME), (HWND)app.getMainWinId());
#endif
            app.exec();
        } else {
            // A dialog with detailed error will have been shown by InitError()
            return EXIT_FAILURE;
        }
    } catch (const std::exception& e) {
        PrintExceptionContinue(&e, "Runaway exception");
        app.handleRunawayException(QString::fromStdString(app.node().getWarnings().translated));
    } catch (...) {
        PrintExceptionContinue(nullptr, "Runaway exception");
        app.handleRunawayException(QString::fromStdString(app.node().getWarnings().translated));
    }
    return app.node().getExitStatus();
}