/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "core/application.h"

#include "data/data_abstract_structure.h"
#include "data/data_forum.h"
#include "data/data_message_reactions.h"
#include "data/data_session.h"
#include "data/data_download_manager.h"
#include "base/battery_saving.h"
#include "base/event_filter.h"
#include "base/concurrent_timer.h"
#include "base/options.h"
#include "base/qt_signal_producer.h"
#include "base/timer.h"
#include "base/unixtime.h"
#include "core/core_settings.h"
#include "core/update_checker.h"
#include "core/shortcuts.h"
#include "core/sandbox.h"
#include "core/local_url_handlers.h"
#include "core/launcher.h"
#include "core/ui_integration.h"
#include "chat_helpers/emoji_keywords.h"
#include "chat_helpers/stickers_emoji_image_loader.h"
#include "base/platform/base_platform_global_shortcuts.h"
#include "base/platform/base_platform_url_scheme.h"
#include "base/platform/base_platform_last_input.h"
#include "base/platform/base_platform_info.h"
#include "platform/platform_specific.h"
#include "platform/platform_integration.h"
#include "history/history.h"
#include "apiwrap.h"
#include "api/api_updates.h"
#include "calls/calls_instance.h"
#include "countries/countries_manager.h"
#include "iv/iv_delegate_impl.h"
#include "iv/iv_instance.h"
#include "iv/iv_data.h"
#include "lang/lang_translator.h"
#include "lang/lang_cloud_manager.h"
#include "lang/lang_hardcoded.h"
#include "lang/lang_instance.h"
#include "inline_bots/bot_attach_web_view.h"
#include "mainwidget.h"
#include "tray.h"
#include "core/click_handler_types.h" // ClickHandlerContext.
#include "core/crash_reports.h"
#include "main/main_account.h"
#include "main/main_domain.h"
#include "main/main_session.h"
#include "media/view/media_view_overlay_widget.h"
#include "media/view/media_view_open_common.h"
#include "mtproto/mtproto_dc_options.h"
#include "mtproto/mtproto_config.h"
#include "media/audio/media_audio_track.h"
#include "media/player/media_player_instance.h"
#include "media/player/media_player_float.h"
#include "media/clip/media_clip_reader.h" // For Media::Clip::Finish().
#include "media/system_media_controls_manager.h"
#include "window/notifications_manager.h"
#include "window/themes/window_theme.h"
#include "ui/widgets/tooltip.h"
#include "ui/gl/gl_detection.h"
#include "ui/text/text_options.h"
#include "ui/effects/spoiler_mess.h"
#include "ui/cached_round_corners.h"
#include "ui/power_saving.h"
#include "storage/storage_domain.h"
#include "storage/storage_databases.h"
#include "storage/localstorage.h"
#include "payments/payments_checkout_process.h"
#include "export/export_manager.h"
#include "webrtc/webrtc_environment.h"
#include "window/window_separate_id.h"
#include "window/window_session_controller.h"
#include "window/window_controller.h"
#include "boxes/abstract_box.h"
#include "base/qthelp_regex.h"
#include "base/qthelp_url.h"
#include "boxes/premium_limits_box.h"
#include "ui/boxes/confirm_box.h"
#include "ui/controls/location_picker.h"
#include "styles/style_window.h"

#include <QtCore/QStandardPaths>
#include <QtCore/QMimeDatabase>
#include <QtGui/QGuiApplication>
#include <QtGui/QScreen>
#include <QtGui/QWindow>

#include <ksandbox.h>

namespace Core {
namespace {

constexpr auto kQuitPreventTimeoutMs = crl::time(1500);
constexpr auto kAutoLockTimeoutLateMs = crl::time(3000);
constexpr auto kClearEmojiImageSourceTimeout = 10 * crl::time(1000);
constexpr auto kFileOpenTimeoutMs = crl::time(1000);

LaunchState GlobalLaunchState/* = LaunchState::Running*/;

void SetCrashAnnotationsGL() {
#ifdef DESKTOP_APP_USE_ANGLE
	CrashReports::SetAnnotation("OpenGL ANGLE", [] {
		if (Core::App().settings().disableOpenGL()) {
			return "Disabled";
		} else switch (Ui::GL::CurrentANGLE()) {
		case Ui::GL::ANGLE::Auto: return "Auto";
		case Ui::GL::ANGLE::D3D11: return "Direct3D 11";
		case Ui::GL::ANGLE::D3D9: return "Direct3D 9";
		case Ui::GL::ANGLE::D3D11on12: return "D3D11on12";
		//case Ui::GL::ANGLE::OpenGL: return "OpenGL";
		}
		Unexpected("Ui::GL::CurrentANGLE value in SetupANGLE.");
	}());
#else // DESKTOP_APP_USE_ANGLE
	CrashReports::SetAnnotation(
		"OpenGL",
		Core::App().settings().disableOpenGL() ? "Disabled" : "Enabled");
#endif // DESKTOP_APP_USE_ANGLE
}

base::options::toggle OptionSkipUrlSchemeRegister({
	.id = kOptionSkipUrlSchemeRegister,
	.name = "Skip URL scheme register",
	.description = "Don't re-register tg:// URL scheme on autoupdate.",
});

} // namespace

Application *Application::Instance = nullptr;

const char kOptionSkipUrlSchemeRegister[] = "skip-url-scheme-register";

struct Application::Private {
	base::Timer quitTimer;
	UiIntegration uiIntegration;
	Settings settings;
};

Application::Application()
: QObject()
, _private(std::make_unique<Private>())
, _platformIntegration(Platform::Integration::Create())
, _batterySaving(std::make_unique<base::BatterySaving>())
, _mediaDevices(std::make_unique<Webrtc::Environment>())
, _databases(std::make_unique<Storage::Databases>())
, _animationsManager(std::make_unique<Ui::Animations::Manager>())
, _clearEmojiImageLoaderTimer([=] { clearEmojiSourceImages(); })
, _audio(std::make_unique<Media::Audio::Instance>())
, _fallbackProductionConfig(
	std::make_unique<MTP::Config>(MTP::Environment::Production))
, _downloadManager(std::make_unique<Data::DownloadManager>())
, _domain(std::make_unique<Main::Domain>(cDataFile()))
, _exportManager(std::make_unique<Export::Manager>())
, _calls(std::make_unique<Calls::Instance>())
, _iv(std::make_unique<Iv::Instance>(
	Ui::CreateChild<Iv::DelegateImpl>(this)))
, _langpack(std::make_unique<Lang::Instance>())
, _langCloudManager(std::make_unique<Lang::CloudManager>(langpack()))
, _emojiKeywords(std::make_unique<ChatHelpers::EmojiKeywords>())
, _tray(std::make_unique<Tray>())
, _autoLockTimer([=] { checkAutoLock(); })
, _fileOpenTimer([=] { checkFileOpen(); }) {
	Ui::Integration::Set(&_private->uiIntegration);

	_platformIntegration->init();

	passcodeLockChanges(
	) | rpl::start_with_next([=](bool locked) {
		_shouldLockAt = 0;
		if (locked) {
			closeAdditionalWindows();
		}
	}, _lifetime);

	passcodeLockChanges(
	) | rpl::start_with_next([=] {
		_notifications->updateAll();
		updateWindowTitles();
	}, _lifetime);

	settings().windowTitleContentChanges(
	) | rpl::start_with_next([=] {
		updateWindowTitles();
	}, _lifetime);

	_domain->activeSessionChanges(
	) | rpl::start_with_next([=](Main::Session *session) {
		if (session && !UpdaterDisabled()) { // #TODO multi someSessionValue
			UpdateChecker().setMtproto(session);
		}
	}, _lifetime);
}

void Application::closeAdditionalWindows() {
	Payments::CheckoutProcess::ClearAll();
	for (const auto &[index, account] : _domain->accounts()) {
		if (account->sessionExists()) {
			account->session().attachWebView().closeAll();
		}
	}
	_iv->closeAll();
}

Application::~Application() {
	if (_saveSettingsTimer && _saveSettingsTimer->isActive()) {
		Local::writeSettings();
	}

	_windowStack.clear();
	setLastActiveWindow(nullptr);
	_windowInSettings = _lastActivePrimaryWindow = nullptr;
	_closingAsyncWindows.clear();
	_windows.clear();
	_mediaView = nullptr;
	_notifications->clearAllFast();

	// We must manually destroy all windows before going further.
	// DestroyWindow on Windows (at least with an active WebView) enters
	// event loop and invoke scheduled crl::on_main callbacks.
	//
	// For example Domain::removeRedundantAccounts() is called from
	// Domain::finish() and there is a violation on Ensures(started()).
	closeAdditionalWindows();

	_domain->finish();

	Local::finish();

	Shortcuts::Finish();

	Ui::Emoji::Clear();
	Media::Clip::Finish();

	Ui::FinishCachedCorners();
	Data::clearGlobalStructures();

	Window::Theme::Uninitialize();

	_mediaControlsManager = nullptr;

	Media::Player::finish(_audio.get());
	style::StopManager();

	Instance = nullptr;
}

void Application::run() {
	// Depends on OpenSSL on macOS, so on ThirdParty::start().
	// Depends on notifications settings.
	_notifications = std::make_unique<Window::Notifications::System>();

	startLocalStorage();

	style::SetCustomFont(settings().customFontFamily());
	style::internal::StartFonts();

	ValidateScale();

	refreshGlobalProxy(); // Depends on app settings being read.

	if (const auto old = Local::oldSettingsVersion(); old < AppVersion) {
		autoRegisterUrlScheme();
		Platform::NewVersionLaunched(old);
	}

	if (cAutoStart() && !Platform::AutostartSupported()) {
		cSetAutoStart(false);
	}

	if (cLaunchMode() == LaunchModeAutoStart && Platform::AutostartSkip()) {
		Platform::AutostartToggle(false);
		Quit();
		return;
	}

	_translator = std::make_unique<Lang::Translator>();
	QCoreApplication::instance()->installTranslator(_translator.get());

	style::StartManager(cScale());
	Ui::InitTextOptions();
	Ui::StartCachedCorners();
	Ui::Emoji::Init();
	Ui::PreloadTextSpoilerMask();
	startShortcuts();
	startEmojiImageLoader();
	startSystemDarkModeViewer();
	Media::Player::start(_audio.get());

	if (MediaControlsManager::Supported()) {
		_mediaControlsManager = std::make_unique<MediaControlsManager>();
	}

	rpl::combine(
		_batterySaving->value(),
		settings().ignoreBatterySavingValue()
	) | rpl::start_with_next([=](bool saving, bool ignore) {
		PowerSaving::SetForceAll(saving && !ignore);
	}, _lifetime);

	style::ShortAnimationPlaying(
	) | rpl::start_with_next([=](bool playing) {
		if (playing) {
			MTP::details::pause();
		} else {
			MTP::details::unpause();
		}
	}, _lifetime);

	DEBUG_LOG(("Application Info: inited..."));

	DEBUG_LOG(("Application Info: starting app..."));

	// Create mime database, so it won't be slow later.
	QMimeDatabase().mimeTypeForName(u"text/plain"_q);

	// Check now to avoid re-entrance later.
	[[maybe_unused]] const auto ivSupported = Iv::ShowButton();
	[[maybe_unused]] const auto lpAvailable = Ui::LocationPicker::Available(
		{});

	_windows.emplace(nullptr, std::make_unique<Window::Controller>());
	setLastActiveWindow(_windows.front().second.get());
	_windowInSettings = _lastActivePrimaryWindow = _lastActiveWindow;

	_domain->activeChanges(
	) | rpl::start_with_next([=](not_null<Main::Account*> account) {
		showAccount(account);
	}, _lifetime);

	(
		_domain->activeValue(
		) | rpl::to_empty | rpl::filter([=] {
			return _domain->started();
		}) | rpl::take(1)
	) | rpl::then(
		_domain->accountsChanges()
	) | rpl::map([=] {
		return (_domain->accounts().size() > Main::Domain::kMaxAccounts)
			? _domain->activeChanges()
			: rpl::never<not_null<Main::Account*>>();
	}) | rpl::flatten_latest(
	) | rpl::start_with_next([=](not_null<Main::Account*> account) {
		const auto ordered = _domain->orderedAccounts();
		const auto it = ranges::find(ordered, account);
		if (_lastActivePrimaryWindow && it != end(ordered)) {
			const auto index = std::distance(begin(ordered), it);
			if ((index + 1) > _domain->maxAccounts()) {
				_lastActivePrimaryWindow->show(Box(
					AccountsLimitBox,
					&account->session()));
			}
		}
	}, _lifetime);

	QCoreApplication::instance()->installEventFilter(this);

	appDeactivatedValue(
	) | rpl::start_with_next([=](bool deactivated) {
		if (deactivated) {
			handleAppDeactivated();
		} else {
			handleAppActivated();
		}
	}, _lifetime);

	DEBUG_LOG(("Application Info: window created..."));

	startDomain();
	startTray();

	_lastActivePrimaryWindow->firstShow();

	startMediaView();

	DEBUG_LOG(("Application Info: showing."));
	_lastActivePrimaryWindow->finishFirstShow();

	if (!_lastActivePrimaryWindow->locked() && cStartToSettings()) {
		_lastActivePrimaryWindow->showSettings();
	}

	_lastActivePrimaryWindow->updateIsActiveFocus();

	for (const auto &error : Shortcuts::Errors()) {
		LOG(("Shortcuts Error: %1").arg(error));
	}

	SetCrashAnnotationsGL();
	if (Ui::GL::LastCrashCheckFailed()) {
		showOpenGLCrashNotification();
	}

	_openInMediaViewRequests.events(
	) | rpl::start_with_next([=](Media::View::OpenRequest &&request) {
		if (_mediaView) {
			_mediaView->show(std::move(request));
		}
	}, _lifetime);
	{
		const auto countries = std::make_shared<Countries::Manager>(
			_domain.get());
		countries->lifetime().add([=] {
			[[maybe_unused]] const auto countriesCopy = countries;
		});
	}

	processCreatedWindow(_lastActivePrimaryWindow);
}

void Application::autoRegisterUrlScheme() {
	if (!OptionSkipUrlSchemeRegister.value()) {
		InvokeQueued(this, [] { RegisterUrlScheme(); });
	}
}

void Application::showAccount(not_null<Main::Account*> account) {
	if (const auto separate = separateWindowFor(account)) {
		_lastActivePrimaryWindow = separate;
		separate->activate();
	} else if (const auto last = activePrimaryWindow()) {
		last->showAccount(account);
	}
}

void Application::checkWindowId(not_null<Window::Controller*> window) {
	const auto id = window->id();
	for (auto &[existingId, existing] : _windows) {
		if (existing.get() == window && existingId != id) {
			auto found = std::move(existing);
			_windows.remove(existingId);
			_windows.emplace(id, std::move(found));
			break;
		}
	}
}

void Application::showOpenGLCrashNotification() {
	const auto enable = [=] {
		Ui::GL::CrashCheckFinish();
		settings().setDisableOpenGL(false);
		Local::writeSettings();
		Restart();
	};
	const auto keepDisabled = [=](Fn<void()> close) {
		Ui::GL::CrashCheckFinish();
		settings().setDisableOpenGL(true);
		Local::writeSettings();
		close();
	};
	_lastActivePrimaryWindow->show(Ui::MakeConfirmBox({
		.text = ""
		"There may be a problem with your graphics drivers and OpenGL. "
		"Try updating your drivers.\n\n"
		"OpenGL has been disabled. You can try to enable it again "
		"or keep it disabled if crashes continue.",
		.confirmed = enable,
		.cancelled = keepDisabled,
		.confirmText = "Enable",
		.cancelText = "Keep Disabled",
	}));
}

void Application::startDomain() {
	const auto state = _domain->start(QByteArray());
	if (state != Storage::StartResult::IncorrectPasscodeLegacy) {
		// In case of non-legacy passcoded app all global settings are ready.
		startSettingsAndBackground();
	}
	if (state != Storage::StartResult::Success) {
		lockByPasscode();
		DEBUG_LOG(("Application Info: passcode needed..."));
	}
}

void Application::startSettingsAndBackground() {
	Local::rewriteSettingsIfNeeded();
	Window::Theme::Background()->start();
	checkSystemDarkMode();
}

void Application::checkSystemDarkMode() {
	const auto maybeDarkMode = settings().systemDarkMode();
	const auto darkModeEnabled = settings().systemDarkModeEnabled();
	const auto needToSwitch = darkModeEnabled
		&& maybeDarkMode
		&& (*maybeDarkMode != Window::Theme::IsNightMode());
	if (needToSwitch) {
		Window::Theme::ToggleNightMode();
		Window::Theme::KeepApplied();
	}
}

void Application::startSystemDarkModeViewer() {
	if (Window::Theme::Background()->editingTheme()) {
		settings().setSystemDarkModeEnabled(false);
	}
	rpl::merge(
		settings().systemDarkModeChanges() | rpl::to_empty,
		settings().systemDarkModeEnabledChanges() | rpl::to_empty
	) | rpl::start_with_next([=] {
		checkSystemDarkMode();
	}, _lifetime);
}

void Application::enumerateWindows(Fn<void(
		not_null<Window::Controller*>)> callback) const {
	for (const auto &window : ranges::views::values(_windows)) {
		callback(window.get());
	}
}

void Application::processCreatedWindow(
		not_null<Window::Controller*> window) {
	window->openInMediaViewRequests(
	) | rpl::start_to_stream(_openInMediaViewRequests, window->lifetime());
}

void Application::startMediaView() {
#ifdef Q_OS_MAC
	// On macOS we create some windows async, otherwise they're
	// added to the Dock Menu as a visible window and are removed
	// only after first show and then hide.
	InvokeQueued(this, [=] {
		_mediaView = std::make_unique<Media::View::OverlayWidget>();
	});
#elif defined Q_OS_WIN // Q_OS_MAC || Q_OS_WIN
	// On Windows we needed such hack for the main window, otherwise
	// somewhere inside the media viewer creating code its geometry
	// was broken / lost to some invalid values.
	const auto current = _lastActivePrimaryWindow->widget()->geometry();
	_mediaView = std::make_unique<Media::View::OverlayWidget>();
	_lastActivePrimaryWindow->widget()->Ui::RpWidget::setGeometry(current);
#else
	_mediaView = std::make_unique<Media::View::OverlayWidget>();
#endif // Q_OS_MAC || Q_OS_WIN
}

void Application::startTray() {
#ifdef Q_OS_MAC
	// On macOS we create some windows async, otherwise they're
	// added to the Dock Menu as a visible window and are removed
	// only after first show and then hide, tray icon being "Item-0".
	InvokeQueued(this, [=] {
		createTray();
	});
#else // Q_OS_MAC
	createTray();
#endif // Q_OS_MAC
}

void Application::createTray() {
	using WindowRaw = not_null<Window::Controller*>;
	_tray->create();
	_tray->aboutToShowRequests(
	) | rpl::start_with_next([=] {
		enumerateWindows([&](WindowRaw w) { w->updateIsActive(); });
		_tray->updateMenuText();
	}, _lifetime);

	_tray->showFromTrayRequests(
	) | rpl::start_with_next([=] {
		activate();
	}, _lifetime);

	_tray->hideToTrayRequests(
	) | rpl::start_with_next([=] {
		enumerateWindows([&](WindowRaw w) {
			w->widget()->minimizeToTray();
		});
	}, _lifetime);
}

void Application::activate() {
	for (const auto &window : _windowStack) {
		if (window == _lastActiveWindow) {
			break;
		}
		const auto widget = window->widget();
		const auto wasHidden = !widget->isVisible();
		const auto state = widget->windowState();
		if (state & Qt::WindowMinimized) {
			widget->setWindowState(state & ~Qt::WindowMinimized);
		}
		widget->setVisible(true);
		widget->activateWindow();
		if (wasHidden) {
			if (const auto session = window->sessionController()) {
				session->content()->windowShown();
			}
		}
	}
	if (_lastActiveWindow) {
		_lastActiveWindow->widget()->showFromTray();
	}
}

auto Application::prepareEmojiSourceImages()
-> std::shared_ptr<Ui::Emoji::UniversalImages> {
	const auto &images = Ui::Emoji::SourceImages();
	if (settings().largeEmoji()) {
		return images;
	}
	Ui::Emoji::ClearSourceImages(images);
	return std::make_shared<Ui::Emoji::UniversalImages>(images->id());
}

void Application::clearEmojiSourceImages() {
	_emojiImageLoader.with([](Stickers::EmojiImageLoader &loader) {
		crl::on_main([images = loader.releaseImages()]{
			Ui::Emoji::ClearSourceImages(images);
		});
	});
}

bool Application::isActiveForTrayMenu() const {
	return ranges::any_of(ranges::views::values(_windows), [=](
			const std::unique_ptr<Window::Controller> &controller) {
		return controller->widget()->isActiveForTrayMenu();
	});
}

bool Application::hideMediaView() {
	if (_mediaView
		&& _mediaView->isFullScreen()
		&& !_mediaView->isMinimized()
		&& !_mediaView->isHidden()) {
		_mediaView->close();
		return true;
	}
	return false;
}

bool Application::eventFilter(QObject *object, QEvent *e) {
	switch (e->type()) {
	case QEvent::KeyPress: {
		updateNonIdle();
		const auto event = static_cast<QKeyEvent*>(e);
		if (base::Platform::GlobalShortcuts::IsToggleFullScreenKey(event)
			&& toggleActiveWindowFullScreen()) {
			return true;
		}
	} break;
	case QEvent::MouseButtonPress:
	case QEvent::TouchBegin:
	case QEvent::Wheel: {
		updateNonIdle();
	} break;

	case QEvent::ShortcutOverride: {
		// handle shortcuts ourselves
		return true;
	} break;

	case QEvent::Shortcut: {
		const auto event = static_cast<QShortcutEvent*>(e);
		DEBUG_LOG(("Shortcut event caught: %1"
			).arg(event->key().toString()));
		if (Shortcuts::HandleEvent(object, event)) {
			return true;
		}
	} break;

	case QEvent::ApplicationActivate: {
		if (object == QCoreApplication::instance()) {
			updateNonIdle();
		}
	} break;

	case QEvent::FileOpen: {
		if (object == QCoreApplication::instance()) {
			const auto event = static_cast<QFileOpenEvent*>(e);
			if (const auto file = event->file(); !file.isEmpty()) {
				_filesToOpen.append(file);
				_fileOpenTimer.callOnce(kFileOpenTimeoutMs);
			} else if (event->url().scheme() == u"tg"_q
				|| event->url().scheme() == u"tonsite"_q) {
				const auto url = QString::fromUtf8(
					event->url().toEncoded().trimmed());
				cSetStartUrl(url.mid(0, 8192));
				checkStartUrl();
				if (_lastActivePrimaryWindow
					&& StartUrlRequiresActivate(url)) {
					_lastActivePrimaryWindow->activate();
				}
			} else if (event->url().scheme() == u"interpret"_q) {
				_filesToOpen.append(event->url().toString());
				_fileOpenTimer.callOnce(kFileOpenTimeoutMs);
			}
		}
	} break;

	case QEvent::ThemeChange: {
		if (Platform::IsLinux()
				&& object == QGuiApplication::allWindows().constFirst()) {
			Core::App().refreshApplicationIcon();
			Core::App().tray().updateIconCounters();
		}
	} break;
	}

	return QObject::eventFilter(object, e);
}

Settings &Application::settings() {
	return _private->settings;
}

const Settings &Application::settings() const {
	return _private->settings;
}

void Application::saveSettingsDelayed(crl::time delay) {
	if (_saveSettingsTimer) {
		_saveSettingsTimer->callOnce(delay);
	}
}

void Application::saveSettings() {
	Local::writeSettings();
}

bool Application::canReadDefaultDownloadPath() const {
	return KSandbox::isInside()
		? base::CanReadDirectory(
			QStandardPaths::writableLocation(
				QStandardPaths::DownloadLocation))
		: true;
}

bool Application::canSaveFileWithoutAskingForPath() const {
	return !settings().askDownloadPath();
}

MTP::Config &Application::fallbackProductionConfig() const {
	if (!_fallbackProductionConfig) {
		_fallbackProductionConfig = std::make_unique<MTP::Config>(
			MTP::Environment::Production);
	}
	return *_fallbackProductionConfig;
}

void Application::refreshFallbackProductionConfig(
		const MTP::Config &config) {
	if (config.environment() == MTP::Environment::Production) {
		_fallbackProductionConfig = std::make_unique<MTP::Config>(config);
	}
}

void Application::constructFallbackProductionConfig(
		const QByteArray &serialized) {
	if (auto config = MTP::Config::FromSerialized(serialized)) {
		if (config->environment() == MTP::Environment::Production) {
			_fallbackProductionConfig = std::move(config);
		}
	}
}

void Application::setCurrentProxy(
		const MTP::ProxyData &proxy,
		MTP::ProxyData::Settings settings) {
	auto &my = _private->settings.proxy();
	const auto current = [&] {
		return my.isEnabled() ? my.selected() : MTP::ProxyData();
	};
	const auto was = current();
	my.setSelected(proxy);
	my.setSettings(settings);
	const auto now = current();
	refreshGlobalProxy();
	_proxyChanges.fire({ was, now });
	my.connectionTypeChangesNotify();
}

auto Application::proxyChanges() const -> rpl::producer<ProxyChange> {
	return _proxyChanges.events();
}

void Application::badMtprotoConfigurationError() {
	if (settings().proxy().isEnabled() && !_badProxyDisableBox) {
		const auto disableCallback = [=] {
			setCurrentProxy(
				settings().proxy().selected(),
				MTP::ProxyData::Settings::System);
		};
		_badProxyDisableBox = Ui::show(
			Ui::MakeInformBox(Lang::Hard::ProxyConfigError()));
		_badProxyDisableBox->boxClosing(
		) | rpl::start_with_next(
			disableCallback,
			_badProxyDisableBox->lifetime());
	}
}

void Application::startLocalStorage() {
	Ui::GL::DetectLastCheckCrash();
	Local::start();
	_saveSettingsTimer.emplace([=] { saveSettings(); });
	settings().saveDelayedRequests() | rpl::start_with_next([=] {
		saveSettingsDelayed();
	}, _lifetime);
}

void Application::startEmojiImageLoader() {
	_emojiImageLoader.with([
		source = prepareEmojiSourceImages(),
		large = settings().largeEmoji()
	](Stickers::EmojiImageLoader &loader) mutable {
		loader.init(std::move(source), large);
	});

	settings().largeEmojiChanges(
	) | rpl::start_with_next([=](bool large) {
		if (large) {
			_clearEmojiImageLoaderTimer.cancel();
		} else {
			_clearEmojiImageLoaderTimer.callOnce(
				kClearEmojiImageSourceTimeout);
		}
	}, _lifetime);

	Ui::Emoji::Updated(
	) | rpl::start_with_next([=] {
		_emojiImageLoader.with([
			source = prepareEmojiSourceImages()
		](Stickers::EmojiImageLoader &loader) mutable {
			loader.switchTo(std::move(source));
		});
	}, _lifetime);
}

void Application::setScreenIsLocked(bool locked) {
	_screenIsLocked = locked;
}

bool Application::screenIsLocked() const {
	return _screenIsLocked;
}

void Application::floatPlayerToggleGifsPaused(bool paused) {
	_floatPlayerGifsPaused = paused;
	if (_lastActiveWindow) {
		if (const auto delegate = _lastActiveWindow->floatPlayerDelegate()) {
			delegate->floatPlayerToggleGifsPaused(paused);
		}
	}
}

rpl::producer<FullMsgId> Application::floatPlayerClosed() const {
	Expects(_floatPlayers != nullptr);

	return _floatPlayers->closeEvents();
}

void Application::logout(Main::Account *account) {
	if (account) {
		account->logOut();
	} else {
		_domain->resetWithForgottenPasscode();
	}
}

void Application::logoutWithChecks(Main::Account *account) {
	const auto weak = base::make_weak(account);
	const auto retry = [=] {
		if (const auto account = weak.get()) {
			logoutWithChecks(account);
		}
	};
	if (!account || !account->sessionExists()) {
		logout(account);
	} else if (_exportManager->inProgress(&account->session())) {
		_exportManager->stopWithConfirmation(retry);
	} else if (account->session().uploadsInProgress()) {
		account->session().uploadsStopWithConfirmation(retry);
	} else if (_downloadManager->loadingInProgress(&account->session())) {
		_downloadManager->loadingStopWithConfirmation(
			retry,
			&account->session());
	} else {
		logout(account);
	}
}

void Application::forceLogOut(
		not_null<Main::Account*> account,
		const TextWithEntities &explanation) {
	const auto box = Ui::show(Ui::MakeConfirmBox({
		.text = explanation,
		.confirmText = tr::lng_passcode_logout(tr::now),
		.inform = true,
	}));
	box->setCloseByEscape(false);
	box->setCloseByOutsideClick(false);
	const auto weak = base::make_weak(account);
	connect(box, &QObject::destroyed, [=] {
		crl::on_main(weak, [=] {
			account->forcedLogOut();
		});
	});
}

void Application::checkLocalTime() {
	const auto adjusted = crl::adjust_time();
	if (adjusted) {
		base::Timer::Adjust();
		base::ConcurrentTimerEnvironment::Adjust();
		base::unixtime::http_invalidate();
	}
	if (const auto session = maybePrimarySession()) {
		session->updates().checkLastUpdate(adjusted);
	}
}

void Application::handleAppActivated() {
	checkLocalTime();
	if (_lastActiveWindow) {
		_lastActiveWindow->updateIsActiveFocus();
	}
}

void Application::handleAppDeactivated() {
	enumerateWindows([&](not_null<Window::Controller*> w) {
		w->updateIsActiveBlur();
	});
	const auto session = _lastActiveWindow
		? _lastActiveWindow->maybeSession()
		: nullptr;
	if (session) {
		session->updates().updateOnline();
	}
	Ui::Tooltip::Hide();
}

rpl::producer<bool> Application::appDeactivatedValue() const {
	const auto &app
		= static_cast<QGuiApplication*>(QCoreApplication::instance());
	return rpl::single(
		app->applicationState()
	) | rpl::then(
		base::qt_signal_producer(
			app,
			&QGuiApplication::applicationStateChanged
	)) | rpl::map([=](Qt::ApplicationState state) {
		return (state != Qt::ApplicationActive);
	});
}

void Application::materializeLocalDrafts() {
	_materializeLocalDraftsRequests.fire({});
}

rpl::producer<> Application::materializeLocalDraftsRequests() const {
	return _materializeLocalDraftsRequests.events();
}

void Application::switchDebugMode() {
	if (Logs::DebugEnabled()) {
		Logs::SetDebugEnabled(false);
		Launcher::Instance().writeDebugModeSetting();
		Restart();
	} else {
		Logs::SetDebugEnabled(true);
		Launcher::Instance().writeDebugModeSetting();
		DEBUG_LOG(("Debug logs started."));
		if (_lastActivePrimaryWindow) {
			_lastActivePrimaryWindow->hideLayer();
		}
	}
}

Main::Account &Application::activeAccount() const {
	return _domain->active();
}

Main::Session *Application::maybePrimarySession() const {
	return _domain->started() ? activeAccount().maybeSession() : nullptr;
}

bool Application::exportPreventsQuit() {
	if (_exportManager->inProgress()) {
		_exportManager->stopWithConfirmation([] {
			Quit();
		});
		return true;
	}
	return false;
}

bool Application::uploadPreventsQuit() {
	if (!_domain->started()) {
		return false;
	}
	for (const auto &[index, account] : _domain->accounts()) {
		if (!account->sessionExists()) {
			continue;
		}
		if (account->session().uploadsInProgress()) {
			account->session().uploadsStopWithConfirmation([=] {
				for (const auto &[index, account] : _domain->accounts()) {
					if (account->sessionExists()) {
						account->session().uploadsStop();
					}
				}
				Quit();
			});
			return true;
		}
	}
	return false;
}

bool Application::downloadPreventsQuit() {
	if (_downloadManager->loadingInProgress()) {
		_downloadManager->loadingStopWithConfirmation([=] { Quit(); });
		return true;
	}
	return false;
}

bool Application::preventsQuit(QuitReason reason) {
	if (exportPreventsQuit()
		|| uploadPreventsQuit()
		|| downloadPreventsQuit()) {
		return true;
	} else if ((!_mediaView
		|| _mediaView->isHidden()
		|| !_mediaView->isFullScreen())
		&& Platform::PreventsQuit(reason)) {
		return true;
	}
	return false;
}

int Application::unreadBadge() const {
	return _domain->unreadBadge();
}

bool Application::unreadBadgeMuted() const {
	return _domain->unreadBadgeMuted();
}

rpl::producer<> Application::unreadBadgeChanges() const {
	return _domain->unreadBadgeChanges();
}

bool Application::offerLegacyLangPackSwitch() const {
	return (_domain->accounts().size() == 1)
		&& activeAccount().sessionExists();
}

bool Application::canApplyLangPackWithoutRestart() const {
	for (const auto &[index, account] : _domain->accounts()) {
		if (account->sessionExists()) {
			return false;
		}
	}
	return true;
}

void Application::checkFileOpen() {
	cSetSendPaths(_filesToOpen);
	_filesToOpen.clear();
	checkSendPaths();
}

void Application::checkSendPaths() {
	if (!cSendPaths().isEmpty()
		&& _lastActivePrimaryWindow
		&& !_lastActivePrimaryWindow->locked()) {
		_lastActivePrimaryWindow->widget()->sendPaths();
	}
}

void Application::checkStartUrl() {
	if (!cStartUrl().isEmpty()) {
		const auto url = cStartUrl();
		if (!Core::App().passcodeLocked()) {
			if (url.startsWith("tonsite://", Qt::CaseInsensitive)) {
				cSetStartUrl(QString());
				iv().showTonSite(url, {});
			} else if (_lastActivePrimaryWindow) {
				cSetStartUrl(QString());
				if (!openLocalUrl(url, {})) {
					cSetStartUrl(url);
				}
			}
		}
	}
}

bool Application::openLocalUrl(const QString &url, QVariant context) {
	return openCustomUrl("tg://", LocalUrlHandlers(), url, context);
}

bool Application::openInternalUrl(const QString &url, QVariant context) {
	return openCustomUrl("internal:", InternalUrlHandlers(), url, context);
}

QString Application::changelogLink() const {
	const auto base = u"https://desktop.telegram.org/changelog"_q;
	const auto languages = {
		"id",
		"de",
		"fr",
		"nl",
		"pl",
		"tr",
		"uk",
		"fa",
		"ru",
		"ms",
		"es",
		"it",
		"uz",
		"pt-br",
		"be",
		"ar",
		"ko",
	};
	const auto current = _langpack->id().replace("-raw", "");
	if (current.isEmpty()) {
		return base;
	}
	for (const auto language : languages) {
		if (current == language || current.split(u'-')[0] == language) {
			return base + "?setln=" + language;
		}
	}
	return base;
}

bool Application::openCustomUrl(
		const QString &protocol,
		const std::vector<LocalUrlHandler> &handlers,
		const QString &url,
		const QVariant &context) {
	const auto urlTrimmed = url.trimmed();
	if (!urlTrimmed.startsWith(protocol, Qt::CaseInsensitive)
		|| passcodeLocked()) {
		return false;
	}
	static const auto kTagExp = QRegularExpression(
		u"^\\~[a-zA-Z0-9_\\-]+\\~:"_q);
	auto skip = protocol.size();
	const auto match = kTagExp.match(base::StringViewMid(urlTrimmed, skip));
	if (match.hasMatch()) {
		skip += match.capturedLength();
	}
	const auto command = base::StringViewMid(urlTrimmed, skip, 8192);
	const auto my = context.value<ClickHandlerContext>();
	const auto controller = my.sessionWindow.get()
		? my.sessionWindow.get()
		: _lastActivePrimaryWindow
		? _lastActivePrimaryWindow->sessionController()
		: nullptr;

	using namespace qthelp;
	const auto options = RegExOption::CaseInsensitive;
	for (const auto &[expression, handler] : handlers) {
		const auto match = regex_match(expression, command, options);
		if (match) {
			return handler(controller, match, context);
		}
	}
	return false;
}

void Application::preventOrInvoke(Fn<void()> &&callback) {
	_lastActivePrimaryWindow->preventOrInvoke(std::move(callback));
}

void Application::updateWindowTitles() {
	enumerateWindows([](not_null<Window::Controller*> window) {
		window->widget()->updateTitle();
	});
}

void Application::lockByPasscode() {
	_passcodeLock = true;
	enumerateWindows([&](not_null<Window::Controller*> w) {
		w->setupPasscodeLock();
	});
	if (_mediaView) {
		_mediaView->close();
	}
}

void Application::maybeLockByPasscode() {
	preventOrInvoke([=] {
		lockByPasscode();
	});
}

void Application::unlockPasscode() {
	clearPasscodeLock();
	enumerateWindows([&](not_null<Window::Controller*> w) {
		w->clearPasscodeLock();
	});
}

void Application::clearPasscodeLock() {
	cSetPasscodeBadTries(0);
	_passcodeLock = false;
}

bool Application::passcodeLocked() const {
	return _passcodeLock.current();
}

void Application::updateNonIdle() {
	_lastNonIdleTime = crl::now();
	if (const auto session = maybePrimarySession()) {
		session->updates().checkIdleFinish(_lastNonIdleTime);
	}
}

crl::time Application::lastNonIdleTime() const {
	return std::max(
		base::Platform::LastUserInputTime().value_or(0),
		_lastNonIdleTime);
}

rpl::producer<bool> Application::passcodeLockChanges() const {
	return _passcodeLock.changes();
}

rpl::producer<bool> Application::passcodeLockValue() const {
	return _passcodeLock.value();
}

bool Application::someSessionExists() const {
	for (const auto &[index, account] : _domain->accounts()) {
		if (account->sessionExists()) {
			return true;
		}
	}
	return false;
}

void Application::checkAutoLock(crl::time lastNonIdleTime) {
	if (!_domain->local().hasLocalPasscode()
		|| passcodeLocked()
		|| !someSessionExists()) {
		_shouldLockAt = 0;
		_autoLockTimer.cancel();
		return;
	} else if (!lastNonIdleTime) {
		lastNonIdleTime = this->lastNonIdleTime();
	}

	checkLocalTime();
	const auto now = crl::now();
	const auto shouldLockInMs = settings().autoLock() * 1000LL;
	const auto checkTimeMs = now - lastNonIdleTime;
	if (checkTimeMs >= shouldLockInMs
		|| (_shouldLockAt > 0
			&& now > _shouldLockAt + kAutoLockTimeoutLateMs)) {
		_shouldLockAt = 0;
		_autoLockTimer.cancel();
		lockByPasscode();
	} else {
		_shouldLockAt = now + (shouldLockInMs - checkTimeMs);
		_autoLockTimer.callOnce(shouldLockInMs - checkTimeMs);
	}
}

void Application::checkAutoLockIn(crl::time time) {
	if (_autoLockTimer.isActive()) {
		auto remain = _autoLockTimer.remainingTime();
		if (remain > 0 && remain <= time) return;
	}
	_autoLockTimer.callOnce(time);
}

void Application::localPasscodeChanged() {
	_shouldLockAt = 0;
	_autoLockTimer.cancel();
	checkAutoLock(crl::now());
}

bool Application::savingPositionFor(
		not_null<Window::Controller*> window) const {
	return !_windowInSettings || (_windowInSettings == window);
}

bool Application::hasActiveWindow(not_null<Main::Session*> session) const {
	if (Quitting() || !_lastActiveWindow) {
		return false;
	} else if (_calls->hasActivePanel(session)) {
		return true;
	} else if (_iv->hasActiveWindow(session)) {
		return true;
	} else if (const auto window = _lastActiveWindow) {
		return (window->account().maybeSession() == session)
			&& window->widget()->isActive();
	}
	return false;
}

Window::Controller *Application::activePrimaryWindow() const {
	return _lastActivePrimaryWindow;
}

Window::Controller *Application::separateWindowFor(
		Window::SeparateId id) const {
	for (const auto &[existingId, window] : _windows) {
		if (existingId == id) {
			return window.get();
		}
	}
	return nullptr;
}

Window::Controller *Application::ensureSeparateWindowFor(
		Window::SeparateId id,
		MsgId showAtMsgId) {
	const auto activate = [&](not_null<Window::Controller*> window) {
		window->activate();
		return window;
	};
	if (const auto existing = separateWindowFor(id)) {
		if (id.thread && id.type == Window::SeparateType::Chat) {
			existing->sessionController()->showThread(
				id.thread,
				showAtMsgId,
				Window::SectionShow::Way::ClearStack);
		}
		return activate(existing);
	}

	const auto result = _windows.emplace(
		id,
		std::make_unique<Window::Controller>(id, showAtMsgId)
	).first->second.get();
	processCreatedWindow(result);
	result->firstShow();
	result->finishFirstShow();
	return activate(result);
}

Window::Controller *Application::windowFor(Window::SeparateId id) const {
	if (const auto separate = separateWindowFor(id)) {
		return separate;
	} else if (id && !id.primary()) {
		return windowFor(not_null(id.account));
	}
	return activePrimaryWindow();
}

Window::Controller *Application::windowForShowingHistory(
		not_null<PeerData*> peer) const {
	if (const auto separate = separateWindowFor(peer)) {
		return separate;
	}
	auto result = (Window::Controller*)nullptr;
	enumerateWindows([&](not_null<Window::Controller*> window) {
		if (const auto controller = window->sessionController()) {
			const auto current = controller->activeChatCurrent();
			if (const auto history = current.history()) {
				if (history->peer == peer) {
					result = window;
				}
			}
		}
	});
	return result;
}

Window::Controller *Application::windowForShowingForum(
		not_null<Data::Forum*> forum) const {
	const auto id = Window::SeparateId(
		Window::SeparateType::Forum,
		forum->history());
	if (const auto separate = separateWindowFor(id)) {
		return separate;
	}
	auto result = (Window::Controller*)nullptr;
	enumerateWindows([&](not_null<Window::Controller*> window) {
		if (const auto controller = window->sessionController()) {
			const auto current = controller->shownForum().current();
			if (forum == current) {
				result = window;
			}
		}
	});
	return result;
}

Window::Controller *Application::findWindow(
		not_null<QWidget*> widget) const {
	const auto window = widget->window();
	if (_lastActiveWindow && _lastActiveWindow->widget() == window) {
		return _lastActiveWindow;
	}
	for (const auto &[id, controller] : _windows) {
		if (controller->widget() == window) {
			return controller.get();
		}
	}
	return nullptr;
}

Window::Controller *Application::activeWindow() const {
	return _lastActiveWindow;
}

bool Application::closeNonLastAsync(not_null<Window::Controller*> window) {
	const auto hasOther = [&] {
		for (const auto &[id, controller] : _windows) {
			if (id.primary()
				&& !_closingAsyncWindows.contains(controller.get())
				&& controller.get() != window
				&& controller->maybeSession()) {
				return true;
			}
		}
		return false;
	}();
	if (!hasOther) {
		return false;
	}
	_closingAsyncWindows.emplace(window);
	crl::on_main(window, [=] { closeWindow(window); });
	return true;
}

void Application::setLastActiveWindow(Window::Controller *window) {
	_floatPlayerDelegateLifetime.destroy();

	if (_floatPlayerGifsPaused && _lastActiveWindow) {
		if (const auto delegate = _lastActiveWindow->floatPlayerDelegate()) {
			delegate->floatPlayerToggleGifsPaused(false);
		}
	}
	_lastActiveWindow = window;
	if (window) {
		const auto i = ranges::find(_windowStack, not_null(window));
		if (i == end(_windowStack)) {
			_windowStack.push_back(window);
		} else if (i + 1 != end(_windowStack)) {
			std::rotate(i, i + 1, end(_windowStack));
		}
	}
	if (!window) {
		_floatPlayers = nullptr;
		return;
	}
	window->floatPlayerDelegateValue(
	) | rpl::start_with_next([=](Media::Player::FloatDelegate *value) {
		if (!value) {
			_floatPlayers = nullptr;
		} else if (_floatPlayers) {
			_floatPlayers->replaceDelegate(value);
		} else if (value) {
			_floatPlayers = std::make_unique<Media::Player::FloatController>(
				value);
		}
		if (value && _floatPlayerGifsPaused) {
			value->floatPlayerToggleGifsPaused(true);
		}
	}, _floatPlayerDelegateLifetime);
}

void Application::closeWindow(not_null<Window::Controller*> window) {
	const auto stackIt = ranges::find(_windowStack, window);
	const auto nextFromStack = _windowStack.empty()
		? nullptr
		: (stackIt == end(_windowStack) || stackIt + 1 != end(_windowStack))
		? _windowStack.back().get()
		: (_windowStack.size() > 1)
		? (stackIt - 1)->get()
		: nullptr;
	const auto next = nextFromStack
		? nextFromStack
		: (_windows.front().second.get() != window)
		? _windows.front().second.get()
		: (_windows.back().second.get() != window)
		? _windows.back().second.get()
		: nullptr;
	Assert(next != window);

	if (_lastActivePrimaryWindow == window) {
		_lastActivePrimaryWindow = next;
	}
	if (_windowInSettings == window) {
		_windowInSettings = next;
	}
	if (stackIt != end(_windowStack)) {
		_windowStack.erase(stackIt);
	}
	if (_lastActiveWindow == window) {
		setLastActiveWindow(next);
		if (_lastActiveWindow) {
			_lastActiveWindow->activate();
			_lastActiveWindow->widget()->updateGlobalMenu();
		}
	}
	_closingAsyncWindows.remove(window);
	for (auto i = begin(_windows); i != end(_windows);) {
		if (i->second.get() == window) {
			Assert(_lastActiveWindow != window);
			Assert(_lastActivePrimaryWindow != window);
			Assert(_windowInSettings != window);
			i = _windows.erase(i);
		} else {
			++i;
		}
	}
	const auto account = domain().started()
		? &domain().active()
		: nullptr;
	if (account
		&& !_windows.contains(Window::SeparateId(account))
		&& _lastActiveWindow) {
		domain().activate(&_lastActiveWindow->account());
	}
}

void Application::closeChatFromWindows(not_null<PeerData*> peer) {
	const auto closeOne = [&] {
		for (const auto &[id, window] : _windows) {
			if (id.thread && id.thread->peer() == peer) {
				closeWindow(window.get());
				return true;
			} else if (const auto controller = window->sessionController()) {
				if (controller->activeChatCurrent().peer() == peer) {
					controller->showByInitialId();
				}
				if (const auto forum = controller->shownForum().current()) {
					if (peer->forum() == forum) {
						controller->closeForum();
					}
				}
			}
		}
		return false;
	};

	while (closeOne()) {
	}
}

void Application::windowActivated(not_null<Window::Controller*> window) {
	const auto was = _lastActiveWindow;
	const auto now = window;

	setLastActiveWindow(window);

	if (window->isPrimary()) {
		_lastActivePrimaryWindow = window;
	}
	window->widget()->updateGlobalMenu();

	const auto wasSession = was ? was->maybeSession() : nullptr;
	const auto nowSession = now->maybeSession();
	if (wasSession != nowSession) {
		if (wasSession) {
			wasSession->updates().updateOnline();
		}
		if (nowSession) {
			nowSession->updates().updateOnline();
		}
	}
	if (_mediaView && _mediaView->takeFocusFrom(now->widget())) {
		_mediaView->activate();
	}
}

bool Application::closeActiveWindow() {
	if (_mediaView && _mediaView->isActive()) {
		_mediaView->close();
		return true;
	} else if (_iv->closeActive() || calls().closeCurrentActiveCall()) {
		return true;
	} else if (const auto window = activeWindow()) {
		if (window->widget()->isActive()) {
			window->close();
			return true;
		}
	}
	return false;
}

bool Application::minimizeActiveWindow() {
	if (_mediaView && _mediaView->isActive()) {
		_mediaView->minimize();
		return true;
	} else if (_iv->minimizeActive()
		|| calls().minimizeCurrentActiveCall()) {
		return true;
	} else {
		if (const auto window = activeWindow()) {
			window->minimize();
			return true;
		}
	}
	return false;
}

bool Application::toggleActiveWindowFullScreen() {
	if (_mediaView && _mediaView->isActive()) {
		_mediaView->toggleFullScreen();
		return true;
	} else if (calls().toggleFullScreenCurrentActiveCall()) {
		return true;
	} else if (const auto window = activeWindow()) {
		if constexpr (Platform::IsMac()) {
			if (window->widget()->isFullScreen()) {
				window->widget()->showNormal();
			} else {
				window->widget()->showFullScreen();
			}
			return true;
		}
	}
	return false;
}

QWidget *Application::getFileDialogParent() {
	if (const auto view = _mediaView.get(); view && !view->isHidden()) {
		return view->widget();
	} else if (const auto active = activeWindow()) {
		return active->widget();
	}
	return nullptr;
}

void Application::notifyFileDialogShown(bool shown) {
	if (_mediaView) {
		_mediaView->notifyFileDialogShown(shown);
	}
}

QPoint Application::getPointForCallPanelCenter() const {
	if (const auto window = activeWindow()) {
		return window->getPointForCallPanelCenter();
	}
	return QGuiApplication::primaryScreen()->geometry().center();
}

bool Application::isSharingScreen() const {
	return _calls->isSharingScreen();
}

// macOS Qt bug workaround, sometimes no leaveEvent() gets to the nested widgets.
void Application::registerLeaveSubscription(not_null<QWidget*> widget) {
#ifdef Q_OS_MAC
	if (const auto window = widget->window()) {
		auto i = _leaveFilters.find(window);
		if (i == end(_leaveFilters)) {
			const auto check = [=](not_null<QEvent*> e) {
				if (e->type() == QEvent::Leave) {
					if (const auto taken = _leaveFilters.take(window)) {
						for (const auto &weak : taken->registered) {
							if (const auto widget = weak.data()) {
								QEvent ev(QEvent::Leave);
								QCoreApplication::sendEvent(widget, &ev);
							}
						}
						delete taken->filter.data();
					}
				}
				return base::EventFilterResult::Continue;
			};
			const auto filter = base::install_event_filter(window, check);
			QObject::connect(filter, &QObject::destroyed, [=] {
				_leaveFilters.remove(window);
			});
			i = _leaveFilters.emplace(
				window,
				LeaveFilter{ .filter = filter.get() }).first;
		}
		i->second.registered.push_back(widget.get());
	}
#endif // Q_OS_MAC
}

void Application::unregisterLeaveSubscription(not_null<QWidget*> widget) {
#ifdef Q_OS_MAC
	if (const auto topLevel = widget->window()) {
		const auto i = _leaveFilters.find(topLevel);
		if (i != end(_leaveFilters)) {
			i->second.registered = std::move(
				i->second.registered
			) | ranges::actions::remove_if([&](QPointer<QWidget> widget) {
				const auto pointer = widget.data();
				return !pointer || (pointer == widget);
			});
		}
	}
#endif // Q_OS_MAC
}

void Application::postponeCall(FnMut<void()> &&callable) {
	Sandbox::Instance().postponeCall(std::move(callable));
}

void Application::refreshGlobalProxy() {
	Sandbox::Instance().refreshGlobalProxy();
}

void QuitAttempt() {
	const auto savingSession = Sandbox::Instance().isSavingSession();
	if (!IsAppLaunched()
		|| savingSession
		|| App().readyToQuit()) {
		Sandbox::QuitWhenStarted();
	}
}

bool Application::readyToQuit() {
	auto prevented = false;
	if (_calls->isQuitPrevent()) {
		prevented = true;
	}
	if (_domain->started()) {
		for (const auto &[index, account] : _domain->accounts()) {
			if (const auto session = account->maybeSession()) {
				if (session->updates().isQuitPrevent()) {
					prevented = true;
				}
				if (session->api().isQuitPrevent()) {
					prevented = true;
				}
				if (session->data().stories().isQuitPrevent()) {
					prevented = true;
				}
				if (session->data().reactions().isQuitPrevent()) {
					prevented = true;
				}
			}
		}
	}
	if (prevented) {
		quitDelayed();
		return false;
	}
	return true;
}

void Application::quitPreventFinished() {
	if (Quitting()) {
		QuitAttempt();
	}
}

void Application::quitDelayed() {
	for (const auto &[id, controller] : _windows) {
		controller->widget()->hide();
	}
	if (!_private->quitTimer.isActive()) {
		_private->quitTimer.setCallback([] { Sandbox::QuitWhenStarted(); });
		_private->quitTimer.callOnce(kQuitPreventTimeoutMs);
	}
}

void Application::refreshApplicationIcon() {
	const auto session = (domain().started() && domain().active().sessionExists())
		? &domain().active().session()
		: nullptr;
	refreshApplicationIcon(session);
}

void Application::refreshApplicationIcon(Main::Session *session) {
	const auto support = session && session->supportMode();
	Shortcuts::ToggleSupportShortcuts(support);
	Platform::SetApplicationIcon(Window::CreateIcon(
		session,
		Platform::IsMac()));
}

void Application::startShortcuts() {
	Shortcuts::Start();

	_domain->activeSessionChanges(
	) | rpl::start_with_next([=](Main::Session *session) {
		refreshApplicationIcon(session);
	}, _lifetime);

	Shortcuts::Requests(
	) | rpl::start_with_next([=](not_null<Shortcuts::Request*> request) {
		using Command = Shortcuts::Command;
		request->check(Command::Quit) && request->handle([] {
			Quit();
			return true;
		});
		request->check(Command::Lock) && request->handle([=] {
			if (!passcodeLocked() && _domain->local().hasLocalPasscode()) {
				maybeLockByPasscode();
				return true;
			}
			return false;
		});
		request->check(Command::Minimize) && request->handle([=] {
			return minimizeActiveWindow();
		});
		request->check(Command::Close) && request->handle([=] {
			return closeActiveWindow();
		});
	}, _lifetime);
}

void Application::RegisterUrlScheme() {
	const auto arguments = Launcher::Instance().customWorkingDir()
		? u"-workdir \"%1\""_q.arg(cWorkingDir())
		: QString();

	base::Platform::RegisterUrlScheme(base::Platform::UrlSchemeDescriptor{
		.executable = Platform::ExecutablePathForShortcuts(),
		.arguments = arguments,
		.protocol = u"tg"_q,
		.protocolName = u"Telegram Link"_q,
		.shortAppName = u"tdesktop"_q,
		.longAppName = QCoreApplication::applicationName(),
		.displayAppName = AppName.utf16(),
		.displayAppDescription = AppName.utf16(),
	});

	base::Platform::RegisterUrlScheme(base::Platform::UrlSchemeDescriptor{
		.executable = Platform::ExecutablePathForShortcuts(),
		.arguments = arguments,
		.protocol = u"tonsite"_q,
		.protocolName = u"TonSite Link"_q,
		.shortAppName = u"tdesktop"_q,
		.longAppName = QCoreApplication::applicationName(),
		.displayAppName = AppName.utf16(),
		.displayAppDescription = AppName.utf16(),
	});
}

bool IsAppLaunched() {
	return (Application::Instance != nullptr);
}

Application &App() {
	Expects(Application::Instance != nullptr);

	return *Application::Instance;
}

void Quit(QuitReason reason) {
   if (Quitting()) {
	   return;
   } else if (IsAppLaunched() && App().preventsQuit(reason)) {
	   return;
   }
   SetLaunchState(LaunchState::QuitRequested);

   QuitAttempt();
}

bool Quitting() {
   return GlobalLaunchState != LaunchState::Running;
}

LaunchState CurrentLaunchState() {
   return GlobalLaunchState;
}

void SetLaunchState(LaunchState state) {
   GlobalLaunchState = state;
}

void Restart() {
   const auto updateReady = !UpdaterDisabled()
	   && (UpdateChecker().state() == UpdateChecker::State::Ready);
   if (updateReady) {
	   cSetRestartingUpdate(true);
   } else {
	   cSetRestarting(true);
	   cSetRestartingToSettings(true);
   }
   Quit();
}

} // namespace Core
