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	diff --git a/changelogs/66.add b/changelogs/66.add
	new file mode 100644
	index 0000000..c42ba58
	--- /dev/null
	+++ b/changelogs/66.add
	@@ -0,0 +1 @@
	+Add preset param to Client::createRoom()
	diff --git a/src/client/client.cpp b/src/client/client.cpp
	index db6343e..0d521a1 100644
	--- a/src/client/client.cpp
	+++ b/src/client/client.cpp
	@@ -1,434 +1,438 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <libkazv-config.hpp>

	#include <filesystem>

	#include <lager/constant.hpp>

	#include "client.hpp"

	namespace Kazv
	{
	Client::Client(lager::reader<SdkModel> sdk,
	ContextT ctx, std::nullopt_t)
	: m_sdk(sdk)
	, m_client(sdk.map(&SdkModel::c))
	, m_ctx(std::move(ctx))
	{
	}

	Client::Client(lager::reader<SdkModel> sdk,
	ContextWithDepsT ctx)
	: m_sdk(sdk)
	, m_client(sdk.map(&SdkModel::c))
	, m_ctx(ctx)
	, m_deps(std::move(ctx))
	{
	}

	Client::Client(InEventLoopTag,
	ContextWithDepsT ctx)
	: m_sdk(std::nullopt)
	, m_client(std::nullopt)
	, m_ctx(ctx)
	, m_deps(std::move(ctx))
	#ifdef KAZV_USE_THREAD_SAFETY_HELPER
	, KAZV_ON_EVENT_LOOP_VAR(true)
	#endif
	{
	}

	Client::Client(InEventLoopTag,
	ContextT ctx, DepsT deps)
	: m_sdk(std::nullopt)
	, m_client(std::nullopt)
	, m_ctx(std::move(ctx))
	, m_deps(std::move(deps))
	#ifdef KAZV_USE_THREAD_SAFETY_HELPER
	, KAZV_ON_EVENT_LOOP_VAR(true)
	#endif
	{
	}


	Client Client::toEventLoop() const
	{
	return Client(InEventLoopTag{}, m_ctx, m_deps.value());
	}


	Room Client::room(std::string id) const
	{
	if (m_deps.has_value()) {
	return Room(sdkCursor(), lager::make_constant(id), m_ctx, m_deps.value());
	} else {
	return Room(sdkCursor(), lager::make_constant(id), m_ctx);
	}
	}

	Room Client::roomByCursor(lager::reader<std::string> id) const
	{
	if (m_deps.has_value()) {
	return Room(sdkCursor(), id, m_ctx, m_deps.value());
	} else {
	return Room(sdkCursor(), id, m_ctx);
	}
	}

	auto Client::passwordLogin(std::string homeserver, std::string username,
	std::string password, std::string deviceName) const
	-> PromiseT
	{
	auto p1 = m_ctx.dispatch(LoginAction{
	homeserver, username, password, deviceName});
	p1
	.then([that=toEventLoop()](auto stat) {
	if (! stat.success()) {
	return;
	}
	// It is meaningless to wait for it in a Promise
	// that is never exposed to the user.
	that.startSyncing();
	});

	return p1;
	}

	auto Client::tokenLogin(std::string homeserver, std::string username,
	std::string token, std::string deviceId) const
	-> PromiseT
	{
	auto p1 = m_ctx.dispatch(TokenLoginAction{
	homeserver, username, token, deviceId});
	p1
	.then([that=toEventLoop()](auto stat) {
	if (! stat.success()) {
	return;
	}
	that.startSyncing();
	});

	return p1;
	}

	auto Client::autoDiscover(std::string userId) const
	-> PromiseT
	{
	return m_ctx.dispatch(GetWellknownAction{userId})
	.then([that=toEventLoop()](auto stat) {
	if (!stat.success()) {
	return that.m_ctx.createResolvedPromise(stat);
	}
	return that.m_ctx.dispatch(GetVersionsAction{stat.dataStr("homeserverUrl")})
	.then([that, stat](auto stat2) {
	if (!stat2.success()) {
	return stat2;
	} else {
	return stat;
	}
	});
	});
	}

	- auto Client::createRoom(RoomVisibility v,
	- std::optional<std::string> name,
	- std::optional<std::string> alias,
	- immer::array<std::string> invite,
	- std::optional<bool> isDirect,
	- bool allowFederate,
	- std::optional<std::string> topic,
	- JsonWrap powerLevelContentOverride) const
	+ auto Client::createRoom(
	+ RoomVisibility v,
	+ std::optional<std::string> name,
	+ std::optional<std::string> alias,
	+ immer::array<std::string> invite,
	+ std::optional<bool> isDirect,
	+ bool allowFederate,
	+ std::optional<std::string> topic,
	+ JsonWrap powerLevelContentOverride,
	+ std::optional<CreateRoomPreset> preset
	+ ) const
	-> PromiseT
	{
	CreateRoomAction a;
	a.visibility = v;
	a.name = name;
	a.roomAliasName = alias;
	a.invite = invite;
	a.isDirect = isDirect;
	a.topic = topic;
	a.powerLevelContentOverride = powerLevelContentOverride;
	// Synapse won't buy it if we do not provide
	// a creationContent object.
	a.creationContent = json{
	{"m.federate", allowFederate}
	};
	+ a.preset = preset;
	return m_ctx.dispatch(std::move(a));
	}

	auto Client::joinRoomById(std::string roomId) const -> PromiseT
	{
	return m_ctx.dispatch(JoinRoomByIdAction{roomId});
	}

	auto Client::joinRoom(std::string roomId, immer::array<std::string> serverName) const
	-> PromiseT
	{
	return m_ctx.dispatch(JoinRoomAction{roomId, serverName});
	}

	auto Client::uploadContent(immer::box<Bytes> content,
	std::string uploadId,
	std::optional<std::string> filename,
	std::optional<std::string> contentType) const
	-> PromiseT
	{
	return m_ctx.dispatch(UploadContentAction{
	FileDesc(FileContent{content.get().begin(), content.get().end()}),
	filename, contentType, uploadId});
	}

	auto Client::uploadContent(FileDesc file) const
	-> PromiseT
	{
	auto basename = file.name()
	? std::optional(std::filesystem::path(file.name().value()).filename().native())
	: std::nullopt;
	return m_ctx.dispatch(UploadContentAction{
	file,
	// use only basename to prevent path info being leaked
	basename,
	file.contentType(),
	// uploadId unused
	std::string{}});
	}

	auto Client::downloadContent(std::string mxcUri, std::optional<FileDesc> downloadTo) const
	-> PromiseT
	{
	return m_ctx.dispatch(DownloadContentAction{mxcUri, downloadTo});
	}

	auto Client::downloadThumbnail(
	std::string mxcUri,
	int width,
	int height,
	std::optional<ThumbnailResizingMethod> method,
	std::optional<FileDesc> downloadTo) const
	-> PromiseT
	{
	return m_ctx.dispatch(DownloadThumbnailAction{mxcUri, width, height, method, std::nullopt, downloadTo});
	}

	auto Client::startSyncing() const -> PromiseT
	{
	KAZV_VERIFY_THREAD_ID();
	using namespace Kazv::CursorOp;

	if (+syncing()) {
	return m_ctx.createResolvedPromise(true);
	}

	auto p1 = m_ctx.createResolvedPromise(true)
	.then([that=toEventLoop()](auto) {
	// post filters, if filters are incomplete
	if ((+that.clientCursor()[&ClientModel::initialSyncFilterId]).empty()
	\|\| (+that.clientCursor()[&ClientModel::incrementalSyncFilterId]).empty()) {
	return that.m_ctx.dispatch(PostInitialFiltersAction{});
	}
	return that.m_ctx.createResolvedPromise(true);
	})
	.then([that=toEventLoop()](auto stat) {
	if (! stat.success()) {
	return that.m_ctx.createResolvedPromise(stat);
	}
	// Upload identity keys if we need to
	if (+that.clientCursor()[&ClientModel::crypto]
	&& ! +that.clientCursor()[&ClientModel::identityKeysUploaded]) {
	return that.m_ctx.dispatch(UploadIdentityKeysAction{});
	} else {
	return that.m_ctx.createResolvedPromise(true);
	}
	});

	p1
	.then([m_ctx=m_ctx](auto stat) {
	m_ctx.dispatch(SetShouldSyncAction{true});
	return stat;
	})
	.then([that=toEventLoop()](auto stat) {
	if (stat.success()) {
	that.syncForever();
	}
	});

	return p1;
	}

	auto Client::syncForever(std::optional<int> retryTime) const -> void
	{
	KAZV_VERIFY_THREAD_ID();

	// assert (m_deps);
	using namespace CursorOp;

	bool isInitialSync = ! (+clientCursor()[&ClientModel::syncToken]).has_value();

	bool shouldSync = +clientCursor()[&ClientModel::shouldSync];

	if (! shouldSync) {
	return;
	}
	//

	auto syncRes = m_ctx.dispatch(SyncAction{});

	auto uploadOneTimeKeysRes = syncRes
	.then([that=toEventLoop()](auto stat) {
	if (! stat.success()) {
	return that.m_ctx.createResolvedPromise(stat);
	}
	auto &rg = lager::get<RandomInterface &>(that.m_deps.value());
	bool hasCrypto{+that.clientCursor()[&ClientModel::crypto]};
	if (! hasCrypto) {
	return that.m_ctx.createResolvedPromise(true);
	}
	auto numKeysToGenerate = (+that.clientCursor()).numOneTimeKeysNeeded();
	return that.m_ctx.dispatch(GenerateAndUploadOneTimeKeysAction{
	numKeysToGenerate,
	rg.generateRange<RandomData>(GenerateAndUploadOneTimeKeysAction::randomSize(numKeysToGenerate))
	});
	});

	auto queryKeysRes = syncRes
	.then([that=toEventLoop(), isInitialSync](auto stat) {
	if (! stat.success()) {
	return that.m_ctx.createResolvedPromise(stat);
	}
	bool hasCrypto{+that.clientCursor()[&ClientModel::crypto]};
	return hasCrypto
	? that.m_ctx.dispatch(QueryKeysAction{isInitialSync})
	: that.m_ctx.createResolvedPromise(true);
	});

	m_ctx.promiseInterface()
	.all(std::vector<PromiseT>{uploadOneTimeKeysRes, queryKeysRes})
	.then([that=toEventLoop(), retryTime](auto stat) {
	if (stat.success()) {
	that.syncForever(); // reset retry time
	} else {
	auto firstRetryTime = +that.clientCursor()[&ClientModel::firstRetryMs];
	auto retryTimeFactor = +that.clientCursor()[&ClientModel::retryTimeFactor];
	auto maxRetryTime = +that.clientCursor()[&ClientModel::maxRetryMs];
	auto curRetryTime = retryTime ? retryTime.value() : firstRetryTime;
	if (curRetryTime > maxRetryTime) { curRetryTime = maxRetryTime; }
	auto nextRetryTime = curRetryTime * retryTimeFactor;

	kzo.client.warn() << "Sync failed, retrying in " << curRetryTime << "ms" << std::endl;
	auto &jh = getJobHandler(that.m_deps.value());
	jh.setTimeout([that=that.toEventLoop(), nextRetryTime]() { that.syncForever(nextRetryTime); },
	curRetryTime);
	}
	});
	}

	auto Client::stopSyncing() const -> PromiseT
	{
	return m_ctx.dispatch(SetShouldSyncAction{false});
	}

	lager::reader<ClientModel> Client::clientCursor() const
	{
	KAZV_VERIFY_THREAD_ID();

	if (m_client.has_value()) {
	return m_client.value();
	} else {
	assert(m_deps.has_value());
	return lager::get<SdkModelCursorKey>(m_deps.value())->map(&SdkModel::c);
	}
	}

	const lager::reader<SdkModel> &Client::sdkCursor() const
	{
	KAZV_VERIFY_THREAD_ID();

	if (m_sdk.has_value()) {
	return m_sdk.value();
	} else {
	assert(m_deps.has_value());
	return *(lager::get<SdkModelCursorKey>(m_deps.value()));
	}
	}

	auto Client::getProfile(std::string userId) const -> PromiseT
	{
	return m_ctx.dispatch(GetUserProfileAction{userId});
	}

	auto Client::setAvatarUrl(std::optional<std::string> avatarUrl) const -> PromiseT
	{
	return m_ctx.dispatch(SetAvatarUrlAction{avatarUrl});
	}

	auto Client::setDisplayName(std::optional<std::string> displayName) const -> PromiseT
	{
	return m_ctx.dispatch(SetDisplayNameAction{displayName});
	}

	auto Client::devicesOfUser(std::string userId) const -> lager::reader<immer::flex_vector<DeviceKeyInfo>>
	{
	return clientCursor()
	[&ClientModel::deviceLists]
	[&DeviceListTracker::deviceLists]
	[userId]
	[lager::lenses::or_default]
	.xform(containerMap(immer::flex_vector<DeviceKeyInfo>{}, zug::map([](const auto &pair) {
	const auto &[deviceId, info] = pair;
	(void)deviceId;
	return info;
	})));
	}

	auto Client::setDeviceTrustLevel(std::string userId, std::string deviceId, DeviceTrustLevel trustLevel) const -> PromiseT
	{
	return m_ctx.dispatch(SetDeviceTrustLevelAction{userId, deviceId, trustLevel});
	}

	auto Client::trustLevelNeededToSendKeys() const -> lager::reader<DeviceTrustLevel>
	{
	return clientCursor()[&ClientModel::trustLevelNeededToSendKeys];
	}

	auto Client::setTrustLevelNeededToSendKeys(DeviceTrustLevel trustLevel) const -> PromiseT
	{
	return m_ctx.dispatch(SetTrustLevelNeededToSendKeysAction{trustLevel});
	}

	auto Client::directRoomMap() const -> lager::reader<immer::map<std::string, std::string>>
	{
	return clientCursor().map(&ClientModel::directRoomMap);
	}

	auto Client::roomIdsUnderTag(std::string tagId) const -> lager::reader<immer::map<std::string, double>>
	{
	return clientCursor().map([tagId](const auto &c) {
	return c.roomIdsUnderTag(tagId);
	});
	}

	auto Client::roomIdsByTagId() const -> lager::reader<immer::map<std::string, immer::map<std::string, double>>>
	{
	return clientCursor().map(&ClientModel::roomIdsByTagId);
	}

	auto Client::accountData() const -> lager::reader<immer::map<std::string, Event>>
	{
	return clientCursor()[&ClientModel::accountData];
	}

	auto Client::setAccountData(Event accountDataEvent) const -> PromiseT
	{
	return m_ctx.dispatch(SetAccountDataAction{accountDataEvent});
	}

	NotificationHandler Client::notificationHandler() const
	{
	return NotificationHandler(clientCursor());
	}
	}
	diff --git a/src/client/client.hpp b/src/client/client.hpp
	index 3d9e4d5..17d6faa 100644
	--- a/src/client/client.hpp
	+++ b/src/client/client.hpp
	@@ -1,549 +1,553 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#pragma once
	#include <libkazv-config.hpp>

	#include <lager/reader.hpp>
	#include <immer/box.hpp>
	#include <immer/map.hpp>
	#include <immer/flex_vector.hpp>
	#include <immer/flex_vector_transient.hpp>

	#include "sdk-model.hpp"
	#include "client/client-model.hpp"
	#include "client/actions/content.hpp"
	#include "sdk-model-cursor-tag.hpp"

	#include "room/room.hpp"
	#include "notification-handler.hpp"

	namespace Kazv
	{
	/**
	* Represent a Matrix client.
	*
	* If the Client is constructed from a cursor originated from
	* a root whose event loop is on thread A, then we say that
	* the Client belongs to thread A. If the Client is not constructed
	* from a cursor, then we say that the Client belongs to the thread
	* where the event loop of the context runs.
	*
	* All methods in this class that take a cursor only take a cursor
	* on the same thread as the Client. All methods in this class that
	* return a cursor will return a cursor on the same thread as the Client.
	*
	* All methods in this class must be run on the same thread as the
	* the Client. If the Client is not constructed from a cursor,
	* copy-constructing another Client from this is safe from any thread.
	* If the Client is constructed from a cursor, copy-constructing another
	* Client is safe only from the same thread as this Client.
	*
	* ## Error handling
	*
	* A lot of functions in Client and Room are asynchronous actions.
	* These actions return the result via a Promise.
	* If an API request has failed, the Promise p will satisfy the following:
	* - `!p.success()`
	* - `p.dataStr("error")` will contain the error message from the response.
	* - `p.dataStr("errorCode")` will contain the matrix error code, if available,
	* or the HTTP status code otherwise.
	*
	* What information is resolved if the API request has succeeded is defined
	* by individual functions.
	*/
	class Client
	{
	public:
	using ActionT = ClientAction;

	using DepsT = lager::deps<JobInterface &, EventInterface &, SdkModelCursorKey, RandomInterface &
	#ifdef KAZV_USE_THREAD_SAFETY_HELPER
	, EventLoopThreadIdKeeper &
	#endif

	>;
	using ContextT = Context<ActionT>;
	using ContextWithDepsT = Context<ActionT, DepsT>;

	using PromiseT = SingleTypePromise<DefaultRetType>;

	struct InEventLoopTag {};
	/**
	* Constructor.
	*
	* Construct the client. Without Deps support.
	*
	* @warning You should not use this directly. Use
	* Sdk::client() instead.
	*/
	Client(lager::reader<SdkModel> sdk,
	ContextT ctx, std::nullopt_t);

	/**
	* Constructor.
	*
	* Construct the client, with Deps support.
	*
	* This enables startSyncing() to work properly.
	*
	* @warning You should not use this directly. Use
	* Sdk::client() instead.
	*/
	Client(lager::reader<SdkModel> sdk,
	ContextWithDepsT ctx);

	/**
	* Constructor.
	*
	* Construct the client, with Deps support.
	*
	* The constructed Client belongs to the thread of event loop.
	*
	* @warning You should not use this directly. Use
	* Sdk::client() instead.
	*/
	Client(InEventLoopTag,
	ContextWithDepsT ctx);

	/**
	* Constructor.
	*
	* Construct the client, with Deps support.
	*
	* The constructed Client belongs to the thread of event loop.
	*
	* @warning You should not use this directly. Use
	* Sdk::client() instead.
	*/
	Client(InEventLoopTag, ContextT ctx, DepsT deps);


	/**
	* Create a Client that is not constructed from a cursor.
	*
	* The returned Client belongs to the thread of event loop.
	*
	* This function is thread-safe if every thread calls it
	* using different objects.
	*
	* @return A Client not constructed from a cursor.
	*/
	Client toEventLoop() const;

	/* lager::reader<immer::map<std::string, Room>> */
	inline auto rooms() const {
	return clientCursor()
	[&ClientModel::roomList]
	[&RoomListModel::rooms];
	}

	/* lager::reader<RangeT<std::string>> */
	inline auto roomIds() const {
	return rooms().xform(
	zug::map([](auto m) {
	return intoImmer(
	immer::flex_vector<std::string>{},
	zug::map([](auto val) { return val.first; }),
	m);
	}));
	}

	auto roomIdsUnderTag(std::string tagId) const -> lager::reader<immer::map<std::string, double>>;

	/**
	* Get the room ids under all tags.
	*
	* @return A lager::reader containing the map from tag id to a map from room id to order.
	* Rooms without a tag will be under the tag id of the empty string.
	*/
	auto roomIdsByTagId() const -> lager::reader<immer::map<std::string, immer::map<std::string, double>>>;

	KAZV_WRAP_ATTR(ClientModel, clientCursor(), serverUrl)
	KAZV_WRAP_ATTR(ClientModel, clientCursor(), loggedIn)
	KAZV_WRAP_ATTR(ClientModel, clientCursor(), userId)
	KAZV_WRAP_ATTR(ClientModel, clientCursor(), token)
	KAZV_WRAP_ATTR(ClientModel, clientCursor(), deviceId)
	KAZV_WRAP_ATTR(ClientModel, clientCursor(), toDevice)

	/**
	* Get the room with @c id .
	*
	* This is equivalent to `roomByCursor(lager::make_constant(id))`.
	*
	* @param id The room id.
	* @return A Room representing the room with `id`.
	*/
	Room room(std::string id) const;

	/**
	* Get the room with `id`.
	*
	* The Room returned will change as the content in `id` changes.
	*
	* For example, you can have the Room that is always the first
	* alphabetically in all rooms by:
	*
	* \code{.cpp}
	* auto someProcessing =
	* zug::map([=](auto ids) {
	* std::sort(ids.begin(), ids.end(), [=](auto id1, auto id2) {
	* using namespace Kazv::CursorOp;
	* return (+client.room(id1).name()) < (+client.room(id2).name());
	* });
	* return ids;
	* });
	* auto room =
	* client.roomByCursor(
	* client.roomIds().xform(someProcessing)[0]);
	* \endcode
	*
	* @param id A lager::reader<std::string> containing the room id.
	* @return A Room representing the room with `id`.
	*/
	Room roomByCursor(lager::reader<std::string> id) const;

	/**
	* Login using the password.
	*
	* This will create a new session on the homeserver.
	*
	* If the returned Promise resolves successfully, this will
	* call `startSyncing()`.
	*
	* @param homeserver The base url of the homeserver. E.g. `https://tusooa.xyz`.
	* @param username The username. This can be the full user id or
	* just the local part. E.g. `tusooa`, `@tusooa:tusooa.xyz`.
	* @param password The password.
	* @param deviceName Optionally, a custom device name. If empty, `libkazv`
	* will be used.
	* @return A Promise that resolves when logging in successfully, or
	* when there is an error.
	*/
	PromiseT passwordLogin(std::string homeserver, std::string username,
	std::string password, std::string deviceName) const;

	/**
	* Login using `token` and `deviceId`.
	*
	* This will not make a request. Library users should make sure
	* the information is correct and the token and the device id are valid.
	*
	* If the returned Promise resolves successfully, this will
	* call `startSyncing()`.
	*
	* @param homeserver The base url of the homeserver. E.g. `https://tusooa.xyz`.
	* @param username The full user id. E.g. `@tusooa:tusooa.xyz`.
	* @param token The access token.
	* @param deviceId The device id that is paired with `token`.
	* @return A Promise that resolves when the account information is filled in.
	*/
	PromiseT tokenLogin(std::string homeserver, std::string username,
	std::string token, std::string deviceId) const;

	/**
	* Automatically discover the homeserver for `userId`.
	*
	* If the operation succeeds, `r.dataStr("homeserverUrl")` will contain
	* the url suitable to pass to `tokenLogin()` and `passwordLogin()`.
	*
	* If there is no well-known file (i.e. server responds with 404),
	* `r.dataStr("homeserverUrl")` will contain the domain part of the user
	* id (`https://example.org` for `@foo:example.org`).
	*
	* @param userId The full user id. E.g. `@foo:example.org`.
	* @return A Promise that resolves when the auto-discovery finishes.
	*/
	PromiseT autoDiscover(std::string userId) const;

	/**
	* Create a room.
	*
	* @param v The visibility of the room.
	* @param name The name of the room.
	* @param alias The alias of the room.
	* @param invite User ids to invite to this room.
	* @param isDirect Whether this room is a direct chat.
	* @param allowFederate Whether to allow users from other homeservers
	* to join this room.
	* @param topic The topic of the room.
	* @param powerLevelContentOverride The content of the m.room.power_levels
	* state event to override the default.
	+ * @param preset The preset to create the room with.
	* @return A Promise that resolves when the room is created,
	* or when there is an error.
	*/
	- PromiseT createRoom(RoomVisibility v,
	- std::optional<std::string> name = {},
	- std::optional<std::string> alias = {},
	- immer::array<std::string> invite = {},
	- std::optional<bool> isDirect = {},
	- bool allowFederate = true,
	- std::optional<std::string> topic = {},
	- JsonWrap powerLevelContentOverride = json::object()) const;
	+ PromiseT createRoom(
	+ RoomVisibility v,
	+ std::optional<std::string> name = {},
	+ std::optional<std::string> alias = {},
	+ immer::array<std::string> invite = {},
	+ std::optional<bool> isDirect = {},
	+ bool allowFederate = true,
	+ std::optional<std::string> topic = {},
	+ JsonWrap powerLevelContentOverride = json::object(),
	+ std::optional<CreateRoomPreset> preset = std::nullopt
	+ ) const;

	/**
	* Join a room by its id.
	*
	* @param roomId The id of the room to join.
	* @return A Promise that resolves when the room is joined,
	* or when there is an error.
	*/
	PromiseT joinRoomById(std::string roomId) const;

	/**
	* Join a room by its id or alias.
	*
	* @param roomId The id or alias of the room to join.
	* @param serverName A list of servers to use when joining the room.
	* This corresponds to the `via` parameter in a matrix.to url.
	* @return A Promise that resolves when the room is joined,
	* or when there is an error.
	*/
	PromiseT joinRoom(std::string roomId, immer::array<std::string> serverName) const;

	/**
	* Upload content to the content repository.
	*
	* @param content The content to upload.
	* @param uploadId
	* @param filename The name of the file.
	* @param contentType The content type of the file.
	* @return A Promise that resolves when the upload is successful,
	* or when there is an error. If it successfully resolves to `r`,
	* `r.dataStr("mxcUri")` will be the MXC URI of the uploaded
	* content.
	*/
	PromiseT uploadContent(immer::box<Bytes> content,
	std::string uploadId,
	std::optional<std::string> filename = std::nullopt,
	std::optional<std::string> contentType = std::nullopt) const;

	/**
	* Upload content to the content repository.
	*
	* @param file The file to upload.
	* @return A Promise that resolves when the upload is successful,
	* or when there is an error. If it successfully resolves to `r`,
	* `r.dataStr("mxcUri")` will be the MXC URI of the uploaded
	* content.
	*/
	PromiseT uploadContent(FileDesc file) const;


	/**
	* Convert a MXC URI to an HTTP(s) URI.
	*
	* The converted URI will be using the homeserver of
	* this Client.
	*
	* @param mxcUri The MXC URI to convert.
	* @return The HTTP(s) URI that has the content indicated
	* by `mxcUri`.
	*/
	inline std::string mxcUriToHttp(std::string mxcUri) const {
	using namespace CursorOp;
	auto [serverName, mediaId] = mxcUriToMediaDesc(mxcUri);
	return (+clientCursor())
	.template job<GetContentJob>()
	.make(serverName, mediaId).url();
	}

	/**
	* Download content from the content repository
	*
	* After the returned Promise resolves successfully,
	* if @c downloadTo is provided, the content will be available
	* in that file; if it is not provided, `r.dataStr("content")`
	* will contain the content of the downloaded file.
	*
	* @param mxcUri The MXC URI of the content.
	* @param downloadTo The file to write the content to. Must not be
	* an in-memory file.
	* @return A Promise that is resolved after the content
	* is downloaded, or when there is an error.
	*/
	PromiseT downloadContent(std::string mxcUri,
	std::optional<FileDesc> downloadTo = std::nullopt) const;

	/**
	* Download a thumbnail from the content repository
	*
	* After the returned Promise resolves successfully,
	* if @c downloadTo is provided, the content will be available
	* in that file; if it is not provided, `r.dataStr("content")`
	* will contain the content of the downloaded file.
	*
	* @param mxcUri The MXC URI of the content.
	* @param width,height The dimension wanted for the thumbnail
	* @param method The method to generate the thumbnail. Either `Crop`
	* or `Scale`.
	* @param downloadTo The file to write the content to. Must not be
	* an in-memory file.
	* @return A Promise that is resolved after the thumbnail
	* is downloaded, or when there is an error.
	*/
	PromiseT downloadThumbnail(std::string mxcUri,
	int width,
	int height,
	std::optional<ThumbnailResizingMethod> method = std::nullopt,
	std::optional<FileDesc> downloadTo = std::nullopt) const;

	/**
	* Fetch the profile of a user.
	*
	* @param userId The id of the user to fetch.
	* @return A Promise that resolves when the fetch is completed.
	* If successful, `r.dataStr("avatarUrl")` will contain the
	* avatar url of that user, and `r.dataStr("displayName")` will
	* contain the display name of that user.
	*/
	PromiseT getProfile(std::string userId) const;

	/**
	* Change the avatar url of the current user.
	*
	* @param avatarUrl The url of the new avatar. Should be an MXC URI.
	* If it is std::nullopt, remove the user avatar.
	* @return A Promise that resolves when the request is completed.
	*/
	PromiseT setAvatarUrl(std::optional<std::string> avatarUrl) const;

	/**
	* Change the display name of the current user.
	*
	* @param displayName The new display name. If it is std::nullopt,
	* remove the user avatar.
	* @return A Promise that resolves when the request is completed.
	*/
	PromiseT setDisplayName(std::optional<std::string> displayName) const;

	// lager::reader<bool>
	inline auto syncing() const {
	return clientCursor()[&ClientModel::syncing];
	}

	/**
	* Start syncing if the Client is not syncing.
	*
	* Syncing will continue indefinitely, if the preparation of
	* the sync (posting filters and uploading identity keys,
	* if needed) is successful, or until stopSyncing() is called.
	*
	* @return A Promise that resolves when the Client is syncing
	* (more exactly, when syncing() contains true), or when there
	* is an error in the preparation of the sync.
	*/
	PromiseT startSyncing() const;

	/**
	* Stop the indefinite syncing.
	*
	* After this, no more syncing actions will be dispatched.
	*
	* @return A Promise that resolves when syncing is stopped.
	*/
	PromiseT stopSyncing() const;

	/**
	* Get the info of all devices of user `userId` that supports encryption.
	*
	* @param userId The id of the user to get the devices of.
	*
	* @return a lager::reader of a RangeT of DeviceKeyInfo representing the devices of that user.
	*/
	auto devicesOfUser(std::string userId) const -> lager::reader<immer::flex_vector<DeviceKeyInfo>>;

	/**
	* Set the trust level of a device.
	*
	* @param userId The id of the user to whom the device belongs.
	* @param deviceId The id of the device.
	*
	* @return a Promise that resolves when the setting is changed.
	*/
	PromiseT setDeviceTrustLevel(std::string userId, std::string deviceId, DeviceTrustLevel trustLevel) const;

	/**
	* Get the trust level needed to send keys to a device.
	*
	* @return a lager::reader of the trust level threshold.
	*/
	auto trustLevelNeededToSendKeys() const -> lager::reader<DeviceTrustLevel>;

	/**
	* Set the trust level needed to send keys to a device.
	*
	* @param trustLevel The trust level threshold.
	*
	* @return a Promise that resolves when the setting is changed.
	*/
	PromiseT setTrustLevelNeededToSendKeys(DeviceTrustLevel trustLevel) const;

	/**
	* Get the map from direct messaging room ids to user ids.
	*
	* @return a lager::reader of such mapping.
	*/
	auto directRoomMap() const -> lager::reader<immer::map<std::string, std::string>>;

	/**
	* Get the account data that is not associated with any room.
	*
	* @return A lager::reader of a map from the type to the account data event.
	*/
	auto accountData() const -> lager::reader<immer::map<std::string, Event>>;

	/**
	* Set the account data that is not associated with any room.
	*
	* @return A Promise that resolves when the account data
	* has been set, or when there is an error.
	*/
	PromiseT setAccountData(Event accountDataEvent) const;

	/**
	* Get a notification handler that works on this Client.
	*
	* @return A notification handler that works on this Client.
	*/
	NotificationHandler notificationHandler() const;

	/**
	* Serialize the model to a Boost.Serialization archive.
	*
	* @param ar A Boost.Serialization output archive.
	*
	* This function can be used to save the model. For loading,
	* you should use the makeSdk function. For example:
	*
	* ```c++
	* client.serializeTo(outputAr);
	*
	* SdkModel m;
	* inputAr >> m;
	* auto newSdk = makeSdk(m, ...);
	* ```
	*/
	template<class Archive>
	void serializeTo(Archive &ar) const {
	ar << sdkCursor().get();
	}

	private:
	void syncForever(std::optional<int> retryTime = std::nullopt) const;

	const lager::reader<SdkModel> &sdkCursor() const;
	lager::reader<ClientModel> clientCursor() const;

	std::optional<lager::reader<SdkModel>> m_sdk;
	std::optional<lager::reader<ClientModel>> m_client;
	ContextT m_ctx;
	std::optional<DepsT> m_deps;
	KAZV_DECLARE_THREAD_ID();
	KAZV_DECLARE_EVENT_LOOP_THREAD_ID_KEEPER(m_deps.has_value() ? &lager::get<EventLoopThreadIdKeeper &>(m_deps.value()) : 0);
	};

	}
	diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
	index db65b1f..94831b6 100644
	--- a/src/tests/CMakeLists.txt
	+++ b/src/tests/CMakeLists.txt
	@@ -1,78 +1,79 @@


	include(CTest)

	set(KAZVTEST_RESPATH ${CMAKE_CURRENT_SOURCE_DIR}/resources)
	configure_file(kazvtest-respath.hpp.in kazvtest-respath.hpp)

	add_executable(kazvtest
	testmain.cpp
	basejobtest.cpp
	event-test.cpp
	cursorutiltest.cpp
	base/serialization-test.cpp
	base/types-test.cpp
	base/immer-utils-test.cpp
	base/json-utils-test.cpp

	client/client-test-util.cpp
	client/discovery-test.cpp
	client/sync-test.cpp
	client/content-test.cpp
	client/paginate-test.cpp
	client/util-test.cpp
	client/serialization-test.cpp
	client/encrypted-file-test.cpp
	client/sdk-test.cpp
	client/thread-safety-test.cpp
	client/room-test.cpp
	client/random-generator-test.cpp
	client/profile-test.cpp
	client/kick-test.cpp
	client/ban-test.cpp
	client/join-test.cpp
	client/keys-test.cpp
	client/device-ops-test.cpp
	client/send-test.cpp
	client/encryption-test.cpp
	client/redact-test.cpp
	client/tagging-test.cpp
	client/account-data-test.cpp
	client/room/room-actions-test.cpp
	client/room/local-echo-test.cpp
	client/room/event-relationships-test.cpp
	client/room/member-membership-test.cpp
	client/push-rules-desc-test.cpp
	client/notification-handler-test.cpp
	client/validator-test.cpp
	client/power-levels-desc-test.cpp
	client/client-test.cpp
	+ client/create-room-test.cpp

	kazvjobtest.cpp
	event-emitter-test.cpp
	crypto-test.cpp
	crypto/deterministic-test.cpp
	promise-test.cpp
	store-test.cpp
	file-desc-test.cpp
	)

	target_include_directories(
	kazvtest
	PRIVATE ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/client)

	target_compile_definitions(kazvtest PRIVATE CATCH_CONFIG_ENABLE_ALL_STRINGMAKERS)

	target_link_libraries(kazvtest
	PRIVATE Catch2::Catch2WithMain
	PRIVATE kazv
	PRIVATE kazveventemitter
	PRIVATE kazvjob
	PRIVATE nlohmann_json::nlohmann_json
	PRIVATE immer
	PRIVATE lager
	PRIVATE zug
	PRIVATE kazvtestfixtures
	)

	add_test(NAME kazvtest COMMAND kazvtest "~[needs-internet]")
	diff --git a/src/tests/client/create-room-test.cpp b/src/tests/client/create-room-test.cpp
	new file mode 100644
	index 0000000..43a0bd8
	--- /dev/null
	+++ b/src/tests/client/create-room-test.cpp
	@@ -0,0 +1,97 @@
	+/*
	+ * This file is part of libkazv.
	+ * SPDX-FileCopyrightText: 2021-2023 tusooa <tusooa@kazv.moe>
	+ * SPDX-License-Identifier: AGPL-3.0-or-later
	+ */
	+
	+#include <libkazv-config.hpp>
	+
	+#include <lager/event_loop/boost_asio.hpp>
	+
	+#include <catch2/catch_test_macros.hpp>
	+#include <boost/asio.hpp>
	+#include <asio-promise-handler.hpp>
	+#include <cprjobhandler.hpp>
	+#include <lagerstoreeventemitter.hpp>
	+#include <cursorutil.hpp>
	+#include <sdk-model.hpp>
	+#include <client/client.hpp>
	+
	+#include "client-test-util.hpp"
	+#include "factory.hpp"
	+
	+using namespace Kazv;
	+using namespace Kazv::Factory;
	+
	+template<class Store, class Func>
	+static auto getMockContext(SingleTypePromiseInterface<EffectStatus> &ph, Store &store, Func func)
	+{
	+ return typename Client::ContextT([&ph, &store, func](const auto &action) {
	+ auto [cont, res] = func(action);
	+ if (!cont) {
	+ return ph.createResolved(res);
	+ }
	+ throw std::runtime_error{"unhandled action"};
	+ }, ph, lager::deps<>{});
	+}
	+
	+TEST_CASE("Client::createRoom()", "[client][create-room]")
	+{
	+ ClientModel m = makeClient();
	+
	+ boost::asio::io_context io;
	+ SingleTypePromiseInterface<EffectStatus> ph{AsioPromiseHandler{io.get_executor()}};
	+ auto jh = Kazv::CprJobHandler{io.get_executor()};
	+ auto ee = Kazv::LagerStoreEventEmitter(lager::with_boost_asio_event_loop{io.get_executor()});
	+
	+ auto sdk = Kazv::makeSdk(
	+ SdkModel{m},
	+ jh,
	+ ee,
	+ Kazv::AsioPromiseHandler{io.get_executor()},
	+ zug::identity
	+ );
	+
	+ auto ctx = sdk.context();
	+ auto createRoomCalled = 0;
	+ std::optional<CreateRoomAction> action = std::nullopt;
	+
	+ auto mockContext = getMockContext(ph, ctx, [&createRoomCalled, &action](const auto &a) {
	+ if (std::holds_alternative<CreateRoomAction>(a)) {
	+ ++createRoomCalled;
	+ action = std::get<CreateRoomAction>(a);
	+ return std::make_pair(/* cont = */ false, EffectStatus());
	+ }
	+ return std::make_pair(/* cont = */ true, EffectStatus());
	+ });
	+
	+ auto client = Client(Client::InEventLoopTag{}, mockContext, sdk.context());
	+
	+ client.createRoom(
	+ /* visibility = */ RoomVisibility::Private,
	+ /* name = */ "some name",
	+ /* alias = */ "alias",
	+ /* invite = */ immer::array<std::string>{"@invited:example.com"},
	+ /* isDirect = */ true,
	+ /* allowFederate = */ true,
	+ /* topic = */ "some topic",
	+ /* powerLevelContentOverride = */ json::object({{"messages", 1}}),
	+ /* preset = */ CreateRoomPreset::TrustedPrivateChat
	+ ).then([&io](auto) {
	+ io.stop();
	+ });
	+
	+ io.run();
	+
	+ REQUIRE(createRoomCalled == 1);
	+ REQUIRE(action->visibility == RoomVisibility::Private);
	+ REQUIRE(action->name == "some name");
	+ REQUIRE(action->roomAliasName == "alias");
	+ REQUIRE(action->invite == immer::array<std::string>{"@invited:example.com"});
	+ REQUIRE(action->isDirect == true);
	+ REQUIRE(action->creationContent.get() == json::object({
	+ {"m.federate", true},
	+ }));
	+ REQUIRE(action->topic == "some topic");
	+ REQUIRE(action->preset == CreateRoomPreset::TrustedPrivateChat);
	+}

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