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	diff --git a/src/contents/ui/main.qml b/src/contents/ui/main.qml
	index 18e8430..d00058e 100644
	--- a/src/contents/ui/main.qml
	+++ b/src/contents/ui/main.qml
	@@ -1,274 +1,279 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	import QtQuick 2.1
	import org.kde.kirigami 2.4 as Kirigami
	import QtQuick.Controls 2.0 as Controls
	import moe.kazv.mxc.kazv 0.0 as MK

	import '.' as Kazv
	import 'shortcuts' as KazvShortcuts

	import 'l10n.js' as L10n

	Kirigami.ApplicationWindow {
	id: root

	property var kazvIOManager: MK.KazvIOManager {
	cacheDirectory: kazvConfig.cacheDirectory
	}

	property var matrixSdk: MK.MatrixSdk {
	onLoginSuccessful: {
	switchToMainPage();
	recordLastSession();
	}
	onLoginFailed: {
	console.log("Login Failed");
	showPassiveNotification(l10n.get('login-page-request-failed-prompt', { errorCode, errorMsg }));
	}
	onDiscoverFailed: {
	console.log("Discover Failed");
	showPassiveNotification(l10n.get('login-page-discover-failed-prompt', { errorCode, errorMsg }));
	}
	onSessionChanged: {
	console.log('session changed');
	reloadSdkVariables();
	}
	}

	property var loggedIn: !!matrixSdk.token

	property var sdkVars: QtObject {
	property var roomList: matrixSdk.roomList()
	property var userGivenNicknameMap: matrixSdk.userGivenNicknameMap()
	property string currentRoomId: ''
	}

	property var l10nProvider: MK.L10nProvider {
	}

	property var kazvConfig: MK.KazvConfig {
	}

	function initializeL10n () {
	const availableLocales = l10nProvider.availableLocaleCodes();
	console.log('available locales:', availableLocales);
	const desiredLanguages = [Qt.uiLanguage];
	console.log('ui language is: ', desiredLanguages);
	const defaultLocale = 'en';

	const wantedLocales = L10n.negotiateLanguages(desiredLanguages, availableLocales, defaultLocale);

	console.log('wanted locales:', wantedLocales);

	const bundles = L10n.generateBundles(wantedLocales, l10nProvider.getFtlData(wantedLocales));
	const provider = new L10n.FluentProvider(bundles);

	return provider;
	}

	property var l10n: initializeL10n();

	title: l10n.get('app-title')

	globalDrawer: Kirigami.GlobalDrawer {
	title: l10n.get('global-drawer-title')
	titleIcon: "applications-graphics"
	property var actionGroupName: 'global-drawer-actions'
	actions: [
	Kirigami.Action {
	objectName: 'switch-account'
	text: l10n.get('global-drawer-action-switch-account')
	icon.name: 'system-switch-user'
	onTriggered: switchAccount()
	},
	Kirigami.Action {
	objectName: 'hard-logout'
	text: l10n.get('global-drawer-action-hard-logout')
	onTriggered: hardLogout()
	},
	Kirigami.Action {
	objectName: 'save'
	text: l10n.get('global-drawer-action-save-session')
	onTriggered: {
	recordLastSession()
	matrixSdk.serializeToFile()
	}
	},
	Kirigami.Action {
	objectName: 'configure-shortcuts'
	text: l10n.get('global-drawer-action-configure-shortcuts')
	onTriggered: {
	pushActionSettingsPage();
	}
	},
	Kirigami.Action {
	objectName: 'settings'
	text: l10n.get('global-drawer-action-settings')
	onTriggered: {
	pushSettingsPage();
	}
	},
	Kirigami.Action {
	objectName: 'create-room'
	enabled: root.loggedIn
	icon.name: 'contact-new'
	text: l10n.get('global-drawer-action-create-room')
	onTriggered: {
	pushCreateRoomPage();
	}
	},
	Kirigami.Action {
	objectName: 'join-room'
	enabled: root.loggedIn
	text: l10n.get('global-drawer-action-join-room')
	onTriggered: {
	pushJoinRoomPage();
	}
	}
	]
	}

	contextDrawer: Kirigami.ContextDrawer {
	id: contextDrawer
	}

	property var actionCollection: KazvShortcuts.ActionCollection {
	id: globalActionCollection
	children: [
	root.globalDrawer,
	root.contextDrawer,
	]
	shortcutsConfig: kazvConfig
	}

	property var notifier: Kazv.Notifier {
	}

	pageStack.initialPage: Qt.resolvedUrl("LoginPage.qml")

	property var mainPage: Kazv.MainPage {
	id: mainPage
	}

	property var emptyPage: Kirigami.Page {
	title: l10n.get('empty-room-page-title')
	Controls.Label {
	text: l10n.get('empty-room-page-description')
	}
	}

	signal switchToRoomRequested(string roomId)
	property var pageManager: Kazv.PageManager {
	pageStack: root.pageStack
	sdkVars: root.sdkVars
	main: root
	}

	function activateRoomSettingsPage(room) {
	pageStack.push(Qt.resolvedUrl("room-settings/RoomSettingsPage.qml"), {
	room
	});
	}

	function activateRoomInvitePage(room) {
	pageStack.push(Qt.resolvedUrl("room-settings/RoomInvitePage.qml"), {
	room
	});
	}

	function activateUserPage(user, room, userId) {
	pageStack.push(Qt.resolvedUrl("qrc:///UserPage.qml"), {
	userId: userId \|\| user.userId,
	user,
	room
	});
	}

	function switchToMainPage() {
	- pageStack.replace([mainPage])
	+ pageStack.replace([root.mainPage])
	pageStack.currentIndex = 0
	}

	function switchToLoginPage() {
	pageStack.replace([Qt.resolvedUrl("LoginPage.qml")])
	pageStack.currentIndex = 0
	}

	function pushLoginPage() {
	pageStack.push(Qt.resolvedUrl("LoginPage.qml"), {
	isSwitchingAccount: true,
	});
	}

	function pushActionSettingsPage() {
	pageStack.push(Qt.resolvedUrl("ActionSettingsPage.qml"), {
	actionsToConfigure: globalActionCollection.allActions(),
	});
	}

	function pushSettingsPage() {
	pageStack.push(Qt.resolvedUrl("SettingsPage.qml"));
	}

	function pushCreateRoomPage() {
	pageStack.push(Qt.resolvedUrl("CreateRoomPage.qml"), {});
	}

	function pushJoinRoomPage() {
	pageStack.push(Qt.resolvedUrl("JoinRoomPage.qml"), {});
	}

	function sessionNameFor(userId, deviceId) {
	return userId + '/' + deviceId;
	}

	function loadSession(sessionName) {
	const succ = matrixSdk.loadSession(sessionName);

	if (succ) {
	console.log('load session successful');
	switchToMainPage();
	recordLastSession();
	} else {
	console.log('load session failed');
	}
	return succ;
	}

	function loadLastSession() {
	console.log('last session is:', kazvConfig.lastSession);

	return loadSession(kazvConfig.lastSession);
	}

	function recordLastSession() {
	kazvConfig.lastSession = sessionNameFor(matrixSdk.userId, matrixSdk.deviceId);
	}

	function reloadSdkVariables() {
	sdkVars.roomList = matrixSdk.roomList();
	sdkVars.userGivenNicknameMap = matrixSdk.userGivenNicknameMap();
	sdkVars.currentRoomId = '';
	}

	function switchAccount() {
	pushLoginPage();
	}

	function hardLogout() {
	+ matrixSdk.logout();
	+ root.loggedIn = false;
	+ pageStack.clear();
	+ root.mainPage = Qt.createComponent("MainPage.qml").createObject(root, { id: mainPage })
	+ pushLoginPage();
	}

	Component.onCompleted: {
	actionCollection.setupShortcuts();
	loadLastSession();
	}

	onClosing: {
	kazvIOManager.clearJobs()
	}
	}
	diff --git a/src/matrix-sdk.cpp b/src/matrix-sdk.cpp
	index b1b9810..582585f 100644
	--- a/src/matrix-sdk.cpp
	+++ b/src/matrix-sdk.cpp
	@@ -1,650 +1,658 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <kazv-defs.hpp>

	#include <boost/archive/text_oarchive.hpp>
	#include <boost/archive/text_iarchive.hpp>
	#include <fstream>
	#include <filesystem>
	#include <chrono>

	#include <QMutex>
	#include <QMutexLocker>
	#include <QtConcurrent>
	#include <QThreadPool>

	#include <KConfig>
	#include <KConfigGroup>

	#include <eventemitter/lagerstoreeventemitter.hpp>
	#include <client/sdk.hpp>
	#include <client/notification-handler.hpp>
	#include <crypto/base64.hpp>

	#include <zug/util.hpp>
	#include <lager/event_loop/qt.hpp>

	#include "matrix-sdk.hpp"
	#include "matrix-room-list.hpp"
	#include "matrix-promise.hpp"
	#include "matrix-event.hpp"
	#include "helper.hpp"
	#include "kazv-path-config.hpp"
	#include "kazv-version.hpp"
	#include "qt-json.hpp"
	#include "qt-rand-adapter.hpp"
	#include "qt-promise-handler.hpp"
	#include "qt-job-handler.hpp"
	#include "device-mgmt/matrix-device-list.hpp"
	#include "matrix-sticker-pack-list.hpp"
	#include "matrix-user-given-attrs-map.hpp"
	#include "kazv-log.hpp"
	#include "matrix-utils.hpp"
	using namespace Kazv;

	// Sdk with qt event loop, identity transform and no enhancers
	using SdkT =
	decltype(makeSdk(
	SdkModel{},
	detail::declref<JobInterface>(),
	detail::declref<EventInterface>(),
	QtPromiseHandler(detail::declref<QObject>()),
	zug::identity,
	withRandomGenerator(detail::declref<RandomInterface>())));

	static void serializeClientToFile(Client c);

	struct QtEventLoop
	{
	QObject *m_obj;

	template<class Fn>
	void async(Fn &&) { throw std::runtime_error{"not implemented!"}; }

	template<class Fn>
	void post(Fn &&fn)
	{
	QMetaObject::invokeMethod(
	m_obj, std::forward<Fn>(fn), Qt::QueuedConnection
	);
	}

	void finish() {}
	void pause() { throw std::runtime_error{"not implemented!"}; }
	void resume() { throw std::runtime_error{"not implemented!"}; }
	};

	struct MatrixSdkPrivate
	{
	MatrixSdkPrivate(MatrixSdk *q, bool testing);
	MatrixSdkPrivate(MatrixSdk *q, bool testing, SdkModel model);
	bool testing;
	RandomInterface randomGenerator;
	QThread *thread;
	QObject *obj;
	QtJobHandler *jobHandler;
	LagerStoreEventEmitter ee;
	LagerStoreEventEmitter::Watchable watchable;
	SdkT sdk;
	QTimer saveTimer;

	using SecondaryRootT = decltype(sdk.createSecondaryRoot(std::declval<lager::with_qt_event_loop>()));
	SecondaryRootT secondaryRoot;
	Client clientOnSecondaryRoot;
	NotificationHandler notificationHandler;
	void runIoContext() {
	thread->start();
	}
	+ void stopIoContext() {
	+ thread->quit();
	+ }

	void maybeSerialize()
	{
	if (!testing) {
	serializeClientToFile(clientOnSecondaryRoot);
	}
	}
	};

	// Cleaning up notes:
	// 0. Callback functions may store the context for an indefinite time
	// 1. The QThread event loop can be stopped
	// 2. QtJobHandler::submit() should only happen in the primary event loop thread
	// 3. QtJobHandler lives in the primary event loop thread
	// 4. QtJobs live in the primary event loop thread
	// 5. Job callbacks are called in the primary event loop thread
	// 6. QtPromise::then() callbacks are called in the primary event loop thread
	// 7. When the QThread event loop stops, no more callbacks will be executed (there is nothing to post to)
	// 8. The QThread should stop before obj is deleted
	class CleanupHelper : public QObject
	{
	Q_OBJECT
	public:
	explicit CleanupHelper(std::unique_ptr<MatrixSdkPrivate> d)
	: oldD(std::move(d))
	{
	// After the thread's event loop is finished, we can delete the root object
	connect(oldD->thread, &QThread::finished, oldD->obj, &QObject::deleteLater);
	connect(oldD->obj, &QObject::destroyed, this, &QObject::deleteLater);
	}

	std::shared_ptr<MatrixSdkPrivate> oldD;

	void cleanup()
	{
	qCInfo(kazvLog) << "start to clean up everything";
	oldD->clientOnSecondaryRoot.stopSyncing()
	.then([oldD=oldD](auto &&) {
	qCDebug(kazvLog) << "stopped syncing";
	QMetaObject::invokeMethod(oldD->obj, [thread=oldD->thread]() {
	thread->quit();
	});
	});
	oldD->thread->wait();
	oldD->thread->deleteLater();
	qCInfo(kazvLog) << "thread is done";
	}
	};

	static void serializeClientToFile(Client c)
	{
	using namespace Kazv::CursorOp;
	auto userId = +c.userId();
	auto deviceId = +c.deviceId();
	if (userId.empty() \|\| deviceId.empty()) {
	qDebug() << "Not logged in, nothing to serialize";
	return;
	}

	using StdPath = std::filesystem::path;
	auto userDataDir = StdPath(kazvUserDataDir().toStdString());
	auto encodedUserId = encodeBase64(userId, Base64Opts::urlSafe);
	auto sessionDir = userDataDir / "sessions"
	/ encodedUserId / deviceId;

	auto storeFile = sessionDir / "store";

	auto metadataFile = sessionDir / "metadata";

	qDebug() << "storeFile=" << QString::fromStdString(storeFile.string());

	std::error_code err;
	if ((! std::filesystem::create_directories(sessionDir, err))
	&& err) {
	qDebug() << "Unable to create sessionDir";
	return;
	}

	{
	auto storeStream = std::ofstream(storeFile);
	if (! storeStream) {
	qDebug() << "Unable to open storeFile";
	return;
	}
	using OAr = boost::archive::text_oarchive;
	auto archive = OAr{storeStream};
	c.serializeTo(archive);
	qDebug() << "Serialization done";
	}

	// store metadata
	{
	KConfig metadata(QString::fromStdString(metadataFile.string()));
	KConfigGroup mdGroup(&metadata, "Metadata");
	mdGroup.writeEntry("kazvVersion", QString::fromStdString(kazvVersionString()));
	mdGroup.writeEntry("archiveFormat", "text");
	}
	}

	MatrixSdkPrivate::MatrixSdkPrivate(MatrixSdk *q, bool testing)
	: testing(testing)
	, randomGenerator(QtRandAdapter{})
	, thread(new QThread())
	, obj(new QObject())
	, jobHandler(new QtJobHandler(obj))
	, ee{QtEventLoop{obj}}
	, watchable(ee.watchable())
	, sdk(makeDefaultSdkWithCryptoRandom(
	randomGenerator.generateRange<std::string>(makeDefaultSdkWithCryptoRandomSize()),
	static_cast<JobInterface &>(*jobHandler),
	static_cast<EventInterface &>(ee),
	QtPromiseHandler(*obj),
	zug::identity,
	withRandomGenerator(randomGenerator)))
	, secondaryRoot(sdk.createSecondaryRoot(QtEventLoop{q}))
	, clientOnSecondaryRoot(sdk.clientFromSecondaryRoot(secondaryRoot))
	, notificationHandler(clientOnSecondaryRoot.notificationHandler())
	{
	obj->moveToThread(thread);
	}

	MatrixSdkPrivate::MatrixSdkPrivate(MatrixSdk *q, bool testing, SdkModel model)
	: testing(testing)
	, randomGenerator(QtRandAdapter{})
	, thread(new QThread())
	, obj(new QObject())
	, jobHandler(new QtJobHandler(obj))
	, ee{QtEventLoop{obj}}
	, watchable(ee.watchable())
	, sdk(makeSdk(
	model,
	static_cast<JobInterface &>(*jobHandler),
	static_cast<EventInterface &>(ee),
	QtPromiseHandler(*obj),
	zug::identity,
	withRandomGenerator(randomGenerator)))
	, secondaryRoot(sdk.createSecondaryRoot(QtEventLoop{q}, std::move(model)))
	, clientOnSecondaryRoot(sdk.clientFromSecondaryRoot(secondaryRoot))
	, notificationHandler(clientOnSecondaryRoot.notificationHandler())
	{
	obj->moveToThread(thread);
	}

	MatrixSdk::MatrixSdk(std::unique_ptr<MatrixSdkPrivate> d, QObject *parent)
	: QObject(parent)
	, m_d(std::move(d))
	{
	init();
	connect(this, &MatrixSdk::trigger,
	this, [](KazvEvent e) {
	qDebug() << "receiving trigger:";
	if (std::holds_alternative<LoginSuccessful>(e)) {
	qDebug() << "Login successful";
	}
	});
	}

	void MatrixSdk::init()
	{
	LAGER_QT(serverUrl) = m_d->clientOnSecondaryRoot.serverUrl().xform(strToQt); Q_EMIT serverUrlChanged(serverUrl());
	LAGER_QT(userId) = m_d->clientOnSecondaryRoot.userId().xform(strToQt); Q_EMIT userIdChanged(userId());
	LAGER_QT(token) = m_d->clientOnSecondaryRoot.token().xform(strToQt); Q_EMIT tokenChanged(token());
	LAGER_QT(deviceId) = m_d->clientOnSecondaryRoot.deviceId().xform(strToQt); Q_EMIT deviceIdChanged(deviceId());

	m_d->watchable.afterAll(
	[this](KazvEvent e) {
	Q_EMIT this->trigger(e);
	});

	m_d->watchable.after<LoginSuccessful>(
	[this](LoginSuccessful e) {
	Q_EMIT this->loginSuccessful(e);
	});

	m_d->watchable.after<LoginFailed>(
	[this](LoginFailed e) {
	Q_EMIT this->loginFailed(
	QString::fromStdString(e.errorCode),
	QString::fromStdString(e.error)
	);
	});

	m_d->watchable.after<ReceivingRoomTimelineEvent>(
	[this](ReceivingRoomTimelineEvent e) {
	Q_EMIT this->receivedMessage(
	QString::fromStdString(e.roomId),
	QString::fromStdString(e.event.id())
	);
	});

	connect(&m_d->saveTimer, &QTimer::timeout, &m_d->saveTimer, [m_d=m_d.get()]() {
	m_d->maybeSerialize();
	});
	const int saveIntervalMs = 1000 * 60 * 5;
	m_d->saveTimer.start(std::chrono::milliseconds{saveIntervalMs});
	}

	MatrixSdk::MatrixSdk(QObject *parent)
	: MatrixSdk(std::make_unique<MatrixSdkPrivate>(this, /* testing = */ false), parent)
	{
	}

	MatrixSdk::MatrixSdk(SdkModel model, bool testing, QObject *parent)
	: MatrixSdk(std::make_unique<MatrixSdkPrivate>(this, testing, std::move(model)), parent)
	{
	}

	static void cleanupDPointer(std::unique_ptr<MatrixSdkPrivate> oldD)
	{
	oldD->saveTimer.disconnect();
	oldD->saveTimer.stop();

	auto helper = new CleanupHelper(std::move(oldD));
	helper->cleanup();
	}

	MatrixSdk::~MatrixSdk()
	{
	if (m_d) {
	serializeToFile();
	cleanupDPointer(std::move(m_d));
	}
	}

	QString MatrixSdk::mxcUriToHttp(QString mxcUri) const
	{
	return QString::fromStdString(m_d->clientOnSecondaryRoot.mxcUriToHttp(mxcUri.toStdString()));
	}

	MatrixDeviceList *MatrixSdk::devicesOfUser(QString userId) const
	{
	return new MatrixDeviceList(m_d->clientOnSecondaryRoot.devicesOfUser(userId.toStdString()));
	}

	void MatrixSdk::login(const QString &userId, const QString &password)
	{
	m_d->clientOnSecondaryRoot
	.autoDiscover(userId.toStdString())
	.then([
	this,
	client=m_d->clientOnSecondaryRoot.toEventLoop(),
	userId,
	password
	](auto res) {
	if (!res.success()) {
	// FIXME use real error codes and msgs when available in libkazv
	Q_EMIT this->discoverFailed("", "");
	return res;
	}

	auto serverUrl = res.dataStr("homeserverUrl");

	client.passwordLogin(
	serverUrl,
	userId.toStdString(),
	password.toStdString(),
	"kazv"
	);

	return res;
	});
	m_d->runIoContext();
	}
	+void MatrixSdk::logout()
	+{
	+ m_d->clientOnSecondaryRoot.logout();
	+ m_d->stopIoContext();
	+}

	MatrixRoomList *MatrixSdk::roomList() const
	{
	return new MatrixRoomList(m_d->clientOnSecondaryRoot);
	}

	void MatrixSdk::emplace(std::optional<SdkModel> model)
	{
	auto testing = m_d->testing;

	if (m_d) {
	cleanupDPointer(std::move(m_d));
	}

	m_d = (model.has_value()
	? std::make_unique<MatrixSdkPrivate>(this, testing, std::move(model.value()))
	: std::make_unique<MatrixSdkPrivate>(this, testing));

	// Re-initialize lager-qt cursors and watchable connections
	init();

	m_d->runIoContext();

	m_d->clientOnSecondaryRoot.startSyncing();

	Q_EMIT sessionChanged();
	}

	QStringList MatrixSdk::allSessions() const
	{
	using StdPath = std::filesystem::path;
	auto userDataDir = StdPath(kazvUserDataDir().toStdString());
	auto allSessionsDir = userDataDir / "sessions";

	QStringList sessionNames;

	try {
	for (const auto &p : std::filesystem::directory_iterator(allSessionsDir)) {
	if (p.is_directory()) {
	auto maybeEncodedUserId = p.path().filename().string();
	auto userId = (!maybeEncodedUserId.empty() && maybeEncodedUserId[0] == '@') ? maybeEncodedUserId : decodeBase64(maybeEncodedUserId, Base64Opts::urlSafe);
	for (const auto &q : std::filesystem::directory_iterator(p.path())) {
	auto path = q.path();
	auto deviceId = path.filename().string();
	std::error_code err;
	if (std::filesystem::exists(path / "store", err)) {
	sessionNames.append(QString::fromStdString(userId + "/" + deviceId));
	}
	}
	}
	}
	} catch (const std::filesystem::filesystem_error &) {
	qDebug() << "sessionDir not available, ignoring";
	}

	return sessionNames;
	}

	void MatrixSdk::serializeToFile() const
	{
	m_d->maybeSerialize();
	}

	bool MatrixSdk::loadSession(QString sessionName)
	{
	using StdPath = std::filesystem::path;
	auto loadFromSession = [this, sessionName](StdPath sessionDir) {
	auto storeFile = sessionDir / "store";

	auto metadataFile = sessionDir / "metadata";

	if (! std::filesystem::exists(storeFile)) {
	qDebug() << "storeFile does not exist, skip loading session " << sessionName;
	return false;
	}

	if (std::filesystem::exists(metadataFile)) {
	KConfig metadata(QString::fromStdString(metadataFile.string()));
	KConfigGroup mdGroup(&metadata, "Metadata");
	auto format = mdGroup.readEntry("archiveFormat");
	if (format != QStringLiteral("text")) {
	qDebug() << "Unknown archive format:" << format;
	return false;
	}
	auto version = mdGroup.readEntry("kazvVersion");
	auto curVersion = kazvVersionString();
	if (version != QString::fromStdString(curVersion)) {
	qDebug() << "A different version from the current one, making a backup";
	std::error_code err;
	auto now = std::chrono::system_clock::now();
	auto backupName =
	std::to_string(std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch()).count());
	auto backupDir = sessionDir / "backup" / backupName;
	if (! std::filesystem::create_directories(backupDir, err)
	&& err) {
	qDebug() << "Cannot create backup directory";
	return false;
	}
	std::filesystem::copy_file(storeFile, backupDir / "store");
	std::filesystem::copy_file(metadataFile, backupDir / "metadata");
	}
	}

	SdkModel model;
	try {
	auto storeStream = std::ifstream(storeFile);
	if (! storeStream) {
	qDebug() << "Unable to open storeFile";
	return false;
	}
	using IAr = boost::archive::text_iarchive;
	auto archive = IAr{storeStream};
	archive >> model;
	qDebug() << "Finished loading session";
	} catch (const std::exception &e) {
	qDebug() << "Error when loading session:" << QString::fromStdString(e.what());
	return false;
	}
	emplace(std::move(model));
	return true;
	};

	qDebug() << "in loadSession(), sessionName=" << sessionName;
	auto userDataDir = StdPath(kazvUserDataDir().toStdString());
	auto parts = sessionName.split('/');
	if (parts.size() == 2) {
	auto userId = parts[0].toStdString();
	auto sessionId = parts[1].toStdString();
	auto encodedUserId = encodeBase64(userId, Base64Opts::urlSafe);
	qCDebug(kazvLog) << "trying new path";
	auto sessionDir = userDataDir / "sessions" / encodedUserId / sessionId;
	if (loadFromSession(sessionDir)) {
	qCDebug(kazvLog) << "new path works";
	return true;
	}
	qCDebug(kazvLog) << "trying legacy path";
	auto legacySessionDir = userDataDir / "sessions" / userId / sessionId;
	return loadFromSession(legacySessionDir);
	}
	qDebug(kazvLog) << "no session found for" << sessionName;
	return false;
	}

	bool MatrixSdk::startNewSession()
	{
	emplace(std::nullopt);
	return true;
	}

	static std::optional<std::string> optMaybe(QString s)
	{
	if (s.isEmpty()) {
	return std::nullopt;
	} else {
	return s.toStdString();
	}
	}

	MatrixPromise *MatrixSdk::createRoom(
	bool isPrivate,
	const QString &name,
	const QString &alias,
	const QStringList &invite,
	bool isDirect,
	bool allowFederate,
	const QString &topic,
	const QJsonValue &powerLevelContentOverride,
	CreateRoomPreset preset
	)
	{
	return new MatrixPromise(m_d->clientOnSecondaryRoot.createRoom(
	isPrivate ? Kazv::RoomVisibility::Private : Kazv::RoomVisibility::Public,
	optMaybe(name),
	optMaybe(alias),
	qStringListToStdF(invite),
	isDirect,
	allowFederate,
	optMaybe(topic),
	nlohmann::json(powerLevelContentOverride),
	static_cast<Kazv::CreateRoomPreset>(preset)
	));
	}

	MatrixPromise *MatrixSdk::joinRoom(const QString &idOrAlias, const QStringList &servers)
	{
	return new MatrixPromise(m_d->clientOnSecondaryRoot.joinRoom(
	idOrAlias.toStdString(),
	qStringListToStdF(servers)
	));
	}

	MatrixPromise *MatrixSdk::setDeviceTrustLevel(QString userId, QString deviceId, QString trustLevel)
	{
	return new MatrixPromise(
	m_d->clientOnSecondaryRoot.setDeviceTrustLevel(
	userId.toStdString(),
	deviceId.toStdString(),
	qStringToTrustLevelFunc(trustLevel)
	)
	);
	}

	MatrixPromise *MatrixSdk::getSelfProfile()
	{
	return new MatrixPromise(
	m_d->clientOnSecondaryRoot.getProfile(userId().toStdString())
	);
	}

	MatrixPromise *MatrixSdk::setDisplayName(QString displayName)
	{
	return new MatrixPromise(
	m_d->clientOnSecondaryRoot.setDisplayName(
	displayName.isEmpty() ? std::nullopt : std::optional<std::string>(displayName.toStdString())
	)
	);
	}

	MatrixPromise *MatrixSdk::setAvatarUrl(QString avatarUrl)
	{
	return new MatrixPromise(
	m_d->clientOnSecondaryRoot.setAvatarUrl(
	avatarUrl.isEmpty() ? std::nullopt : std::optional<std::string>(avatarUrl.toStdString())
	)
	);
	}

	void MatrixSdk::startThread()
	{
	m_d->runIoContext();
	}

	RandomInterface &MatrixSdk::randomGenerator() const
	{
	return m_d->randomGenerator;
	}

	bool MatrixSdk::shouldNotify(MatrixEvent *event) const
	{
	// Do not notify own event
	if (event->sender() == userId()) {
	return false;
	}
	return m_d->notificationHandler.handleNotification(event->underlyingEvent()).shouldNotify;
	}

	bool MatrixSdk::shouldPlaySound(MatrixEvent *event) const
	{
	return m_d->notificationHandler.handleNotification(event->underlyingEvent()).sound.has_value();
	}

	MatrixStickerPackList *MatrixSdk::stickerPackList() const
	{
	return new MatrixStickerPackList(m_d->clientOnSecondaryRoot);
	}

	MatrixPromise *MatrixSdk::updateStickerPack(MatrixStickerPackSource source)
	{
	if (source.source == MatrixStickerPackSource::AccountData) {
	auto eventJson = std::move(source.event).raw().get();
	eventJson["type"] = source.eventType;
	return sendAccountDataImpl(Event(std::move(eventJson)));
	} else {
	return 0;
	}
	}

	MatrixUserGivenAttrsMap *MatrixSdk::userGivenNicknameMap() const
	{
	return new MatrixUserGivenAttrsMap(
	userGivenNicknameMapFor(m_d->clientOnSecondaryRoot),
	[client=m_d->clientOnSecondaryRoot](json content) {
	return client.setAccountData(json{
	{"type", USER_GIVEN_NICKNAME_EVENT_TYPES[0]},
	{"content", std::move(content)},
	});
	}
	);
	}

	MatrixPromise *MatrixSdk::sendAccountDataImpl(Event event)
	{
	return new MatrixPromise(m_d->clientOnSecondaryRoot.setAccountData(event));
	}

	#include "matrix-sdk.moc"
	diff --git a/src/matrix-sdk.hpp b/src/matrix-sdk.hpp
	index 4a2185a..a5f582f 100644
	--- a/src/matrix-sdk.hpp
	+++ b/src/matrix-sdk.hpp
	@@ -1,240 +1,241 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#pragma once
	#include <kazv-defs.hpp>

	#include <QObject>
	#include <QQmlEngine>
	#include <QString>

	#include <memory>

	#include <lager/extra/qt.hpp>

	#include <sdk-model.hpp>
	#include <random-generator.hpp>

	#include "meta-types.hpp"
	Q_MOC_INCLUDE("matrix-room-list.hpp")
	Q_MOC_INCLUDE("matrix-device-list.hpp")
	Q_MOC_INCLUDE("matrix-promise.hpp")
	Q_MOC_INCLUDE("matrix-event.hpp")
	Q_MOC_INCLUDE("matrix-sticker-pack-list.hpp")
	Q_MOC_INCLUDE("matrix-user-given-attrs-map.hpp")

	class MatrixRoomList;
	class MatrixDeviceList;
	class MatrixPromise;
	class MatrixSdkTest;
	class MatrixEvent;
	class MatrixStickerPackList;
	class MatrixUserGivenAttrsMap;

	struct MatrixSdkPrivate;

	class MatrixSdk : public QObject
	{
	Q_OBJECT
	QML_ELEMENT

	std::unique_ptr<MatrixSdkPrivate> m_d;

	/// @param d A dynamically allocated d-pointer, whose ownership
	/// will be transferred to this MatrixSdk.
	explicit MatrixSdk(std::unique_ptr<MatrixSdkPrivate> d, QObject *parent);

	void init();

	public:
	enum CreateRoomPreset {
	PrivateChat = Kazv::CreateRoomPreset::PrivateChat,
	PublicChat = Kazv::CreateRoomPreset::PublicChat,
	TrustedPrivateChat = Kazv::CreateRoomPreset::TrustedPrivateChat,
	};

	Q_ENUM(CreateRoomPreset);

	explicit MatrixSdk(QObject *parent = 0);
	~MatrixSdk() override;

	LAGER_QT_READER(QString, serverUrl);
	LAGER_QT_READER(QString, userId);
	LAGER_QT_READER(QString, token);
	LAGER_QT_READER(QString, deviceId);

	Q_INVOKABLE MatrixRoomList *roomList() const;

	Q_INVOKABLE QString mxcUriToHttp(QString mxcUri) const;

	Q_INVOKABLE MatrixDeviceList *devicesOfUser(QString userId) const;

	Kazv::RandomInterface &randomGenerator() const;

	private:
	// Replaces the store with another one
	void emplace(std::optional<Kazv::SdkModel> model);

	Q_SIGNALS:
	void trigger(Kazv::KazvEvent e);

	void loginSuccessful(Kazv::KazvEvent e);
	void loginFailed(QString errorCode, QString errorMsg);
	void discoverFailed(QString errorCode, QString errorMsg);

	void receivedMessage(QString roomId, QString eventId);

	void sessionChanged();

	public Q_SLOTS:
	void login(const QString &userId, const QString &password);
	+ void logout();

	/**
	* Serialize data to <AppDataDir>/sessions/<userid>/<deviceid>/
	*
	* If not logged in, do nothing.
	*/
	void serializeToFile() const;

	/**
	* Load session at <AppDataDir>/sessions/<sessionName> .
	*
	* @param sessionName A string in the form of <userid>/<deviceid> .
	*
	* @return true if successful, false otherwise.
	*/
	bool loadSession(QString sessionName);

	/**
	* Start an empty session.
	*
	* The new session is not logged in, and need to call login().
	*
	* @return true if successful, false otherwise.
	*/
	bool startNewSession();

	/**
	* Get all saved sessions.
	*
	* @return A list of session names in the form of <userid>/<deviceid> .
	*/
	QStringList allSessions() const;

	/**
	* Create a new room.
	*
	* @param isPrivate Whether the room is private.
	* @param name The room's name.
	* @param alias The alias of the room.
	* @param invite List of matrix ids of users to invite.
	* @param isDirect Whether it is a direct message room.
	* @param allowFederate Whether to allow users on other servers to join.
	* @param topic The topic of the room.
	* @param powerLevelContentOverride The content to override m.room.power_levels event.
	* @param preset The preset to create the room with.
	*/
	MatrixPromise *createRoom(
	bool isPrivate,
	const QString &name,
	const QString &alias,
	const QStringList &invite,
	bool isDirect,
	bool allowFederate,
	const QString &topic,
	const QJsonValue &powerLevelContentOverride,
	CreateRoomPreset preset
	);

	/**
	* Join a room.
	* @param idOrAlias The id or alias of the room to join.
	* @param servers The servers to use when joining the room.
	*/
	MatrixPromise *joinRoom(
	const QString &idOrAlias,
	const QStringList &servers
	);

	/**
	* Change the trust level of a device.
	*
	* @param userId The user id that owns the device.
	* @param deviceId The device id to set the trust level.
	* @param trustLevel The trust level.
	*
	* @return A MatrixPromise representing the progress.
	*/
	MatrixPromise *setDeviceTrustLevel(QString userId, QString deviceId, QString trustLevel);

	/**
	* Get the profile of the current user.
	*
	* @return A MatrixPromise representing the progress.
	*/
	MatrixPromise *getSelfProfile();

	/**
	* Set the display name of the current user.
	*
	* @return A MatrixPromise representing the progress.
	*/
	MatrixPromise *setDisplayName(QString displayName);

	/**
	* Set the avatar url of the current user.
	*
	* @return A MatrixPromise representing the progress.
	*/
	MatrixPromise *setAvatarUrl(QString avatarUrl);

	/**
	* Check if an event should be notified.
	*
	* @param event The event to check.
	* @return Whether `event` should be notified.
	*/
	bool shouldNotify(MatrixEvent *event) const;

	/**
	* Check if an event should be notified with sound.
	*
	* You should only call this method when `shouldNotify(event)`
	* returns true.
	*
	* @param event The event to check.
	* @return Whether `event` should be notified with sound.
	*/
	bool shouldPlaySound(MatrixEvent *event) const;

	/**
	* Get the sticker pack list for the current account.
	*
	* @return A list of sticker packs associated with the current account.
	*/
	MatrixStickerPackList *stickerPackList() const;

	/**
	* Update the sticker pack from source.
	*
	* @param source The source of the sticker pack to update.
	* @return A promise that resolves when the sticker pack is updated,
	* or when there is an error.
	*/
	MatrixPromise *updateStickerPack(MatrixStickerPackSource source);

	MatrixUserGivenAttrsMap *userGivenNicknameMap() const;

	private:
	MatrixPromise *sendAccountDataImpl(Kazv::Event event);

	private: // Testing
	friend MatrixSdkTest;
	friend MatrixSdk *makeTestSdk(Kazv::SdkModel model);

	explicit MatrixSdk(Kazv::SdkModel model, bool testing = false, QObject *parent = 0);
	void startThread();
	};

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