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	diff --git a/changelogs/72.add b/changelogs/72.add
	new file mode 100644
	index 0000000..89d0d8d
	--- /dev/null
	+++ b/changelogs/72.add
	@@ -0,0 +1 @@
	+Add constant-time cursors for room timeline
	diff --git a/src/client/room/room.cpp b/src/client/room/room.cpp
	index 259f320..026cec0 100644
	--- a/src/client/room/room.cpp
	+++ b/src/client/room/room.cpp
	@@ -1,816 +1,841 @@
	/*
	* 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 <immer/algorithm.hpp>
	#include <debug.hpp>

	#include "room.hpp"

	namespace Kazv
	{
	Room::Room(lager::reader<SdkModel> sdk,
	lager::reader<std::string> roomId,
	Context<ClientAction> ctx,
	DepsT deps)
	: m_sdk(sdk)
	, m_roomId(roomId)
	, m_ctx(ctx)
	, m_deps(deps)
	, m_roomCursor(makeRoomCursor())
	{
	}

	Room::Room(lager::reader<SdkModel> sdk,
	lager::reader<std::string> roomId,
	Context<ClientAction> ctx)
	: m_sdk(sdk)
	, m_roomId(roomId)
	, m_ctx(ctx)
	, m_deps(std::nullopt)
	, m_roomCursor(makeRoomCursor())
	{
	}

	Room::Room(InEventLoopTag, std::string roomId, ContextT ctx, DepsT deps)
	: m_sdk(std::nullopt)
	, m_roomId(roomId)
	, m_ctx(ctx)
	, m_deps(deps)
	, m_roomCursor(makeRoomCursor())
	#ifdef KAZV_USE_THREAD_SAFETY_HELPER
	, KAZV_ON_EVENT_LOOP_VAR(true)
	#endif
	{
	}

	Room Room::toEventLoop() const
	{
	assert(m_deps.has_value());
	return Room(InEventLoopTag{}, currentRoomId(), m_ctx, m_deps.value());
	}

	const lager::reader<SdkModel> &Room::sdkCursor() const
	{
	if (m_sdk.has_value()) { return m_sdk.value(); }

	assert(m_deps.has_value());

	return *lager::get<SdkModelCursorKey>(m_deps.value());
	}

	const lager::reader<RoomModel> &Room::roomCursor() const
	{
	return m_roomCursor;
	}

	lager::reader<RoomModel> Room::makeRoomCursor() const
	{
	return lager::match(m_roomId)(
	[&](const lager::reader<std::string> &roomId) -> lager::reader<RoomModel> {
	return lager::with(sdkCursor().map(&SdkModel::c)[&ClientModel::roomList], roomId)
	.map([](auto rooms, auto id) {
	return rooms[id];
	}).make();
	},
	[&](const std::string &roomId) -> lager::reader<RoomModel> {
	return sdkCursor().map(&SdkModel::c)[&ClientModel::roomList].map([roomId](auto rooms) { return rooms[roomId]; }).make();
	});
	}

	std::string Room::currentRoomId() const
	{
	return lager::match(m_roomId)(
	[&](const lager::reader<std::string> &roomId) {
	return roomId.get();
	},
	[&](const std::string &roomId) {
	return roomId;
	});
	}

	auto Room::message(lager::reader<std::string> eventId) const -> lager::reader<Event>
	{
	return lager::with(roomCursor()[&RoomModel::messages], eventId)
	.map([](const auto &msgs, const auto &id) {
	return msgs[id];
	});
	}

	auto Room::members() const -> lager::reader<immer::flex_vector<std::string>>
	{
	return roomCursor().map([](auto room) {
	return room.joinedMemberIds();
	});
	}

	auto Room::invitedMembers() const -> lager::reader<immer::flex_vector<std::string>>
	{
	return roomCursor().map([](auto room) {
	return room.invitedMemberIds();
	});
	}

	auto Room::knockedMembers() const -> lager::reader<immer::flex_vector<std::string>>
	{
	return roomCursor().map([](auto room) {
	return room.knockedMemberIds();
	});
	}

	auto Room::leftMembers() const -> lager::reader<immer::flex_vector<std::string>>
	{
	return roomCursor().map([](auto room) {
	return room.leftMemberIds();
	});
	}

	auto Room::bannedMembers() const -> lager::reader<immer::flex_vector<std::string>>
	{
	return roomCursor().map([](auto room) {
	return room.bannedMemberIds();
	});
	}

	auto Room::joinedMemberEvents() const -> lager::reader<EventList>
	{
	return roomCursor().map([](auto room) {
	return room.joinedMemberEvents();
	});
	}

	auto Room::invitedMemberEvents() const -> lager::reader<EventList>
	{
	return roomCursor().map([](auto room) {
	return room.invitedMemberEvents();
	});
	}

	auto Room::knockedMemberEvents() const -> lager::reader<EventList>
	{
	return roomCursor().map([](auto room) {
	return room.knockedMemberEvents();
	});
	}

	auto Room::leftMemberEvents() const -> lager::reader<EventList>
	{
	return roomCursor().map([](auto room) {
	return room.leftMemberEvents();
	});
	}

	auto Room::bannedMemberEvents() const -> lager::reader<EventList>
	{
	return roomCursor().map([](auto room) {
	return room.bannedMemberEvents();
	});
	}

	auto Room::memberEventByCursor(lager::reader<std::string> userId) const -> lager::reader<Event>
	{
	return inviteStateOrStateEvent(userId.map([](auto id) {
	return KeyOfState{"m.room.member", id};
	}));
	}

	auto Room::memberEventFor(std::string userId) const -> lager::reader<Event>
	{
	return memberEventByCursor(lager::make_constant(userId));
	}

	lager::reader<immer::map<KeyOfState, Event>> Room::inviteStateOrState() const
	{
	return lager::with(stateEvents(), inviteState(), membership())
	.map([](const auto &stateEv, const auto &inviteSt, const auto &mem) {
	if (mem == RoomMembership::Invite) {
	return inviteSt;
	} else {
	return stateEv;
	}
	});
	}

	lager::reader<Event> Room::inviteStateOrStateEvent(lager::reader<KeyOfState> key) const
	{
	return lager::with(stateEvents(), inviteState(), membership(), key)
	.map([](const auto &stateEv, const auto &inviteSt, const auto &mem, const auto &k) {
	if (mem == RoomMembership::Invite) {
	auto maybePtr = inviteSt.find(k);
	return maybePtr ? *maybePtr : stateEv[k];
	} else {
	return stateEv[k];
	}
	});
	}

	auto Room::inviteState() const -> lager::reader<immer::map<KeyOfState, Event>>
	{
	return roomCursor()[&RoomModel::inviteState];
	}

	auto Room::heroMemberEvents() const -> lager::reader<immer::flex_vector<Event>>
	{
	using namespace lager::lenses;
	auto idsCursor = heroIds();
	lager::reader<immer::map<KeyOfState, Event>> statesCursor = stateEvents();

	return lager::with(idsCursor, statesCursor)
	.xform(zug::map([](const auto &ids, const auto &states) {
	return intoImmer(
	immer::flex_vector<Event>{},
	zug::map([states](const auto &id) {
	return states[{"m.room.member", id}];
	}),
	ids);
	}));
	}

	auto Room::heroDisplayNames() const
	-> lager::reader<immer::flex_vector<std::string>>
	{
	return heroMemberEvents()
	.xform(zug::map([](const auto &events) {
	return intoImmer(
	immer::flex_vector<std::string>{},
	zug::map([](const auto &event) {
	auto content = event.content();
	return content.get().contains("displayname")
	? content.get()["displayname"].template get<std::string>()
	: std::string();
	}),
	events);
	}));
	}

	auto Room::nameOpt() const -> lager::reader<std::optional<std::string>>
	{
	using namespace lager::lenses;
	return inviteStateOrState()
	[KeyOfState{"m.room.name", ""}]
	[or_default]
	.xform(eventContent)
	.xform(zug::map([](const JsonWrap &content) {
	return content.get().contains("name")
	? std::optional<std::string>(content.get()["name"])
	: std::nullopt;
	}));
	}

	auto Room::name() const -> lager::reader<std::string>
	{
	using namespace lager::lenses;
	return nameOpt()[value_or("<no name>")];
	}

	lager::reader<bool> Room::encrypted() const
	{
	return roomCursor()[&RoomModel::encrypted];
	}

	auto Room::heroIds() const
	-> lager::reader<immer::flex_vector<std::string>>
	{
	return roomCursor().map([](const auto &room) {
	return room.heroIds;
	});
	}

	auto Room::joinedMemberCount() const -> lager::reader<std::size_t>
	{
	return roomCursor()[&RoomModel::joinedMemberCount];
	}

	auto Room::invitedMemberCount() const -> lager::reader<std::size_t>
	{
	return roomCursor()[&RoomModel::invitedMemberCount];
	}

	auto Room::avatarMxcUri() const -> lager::reader<std::string>
	{
	using namespace lager::lenses;
	return inviteStateOrState()
	[KeyOfState{"m.room.avatar", ""}]
	[or_default]
	.map([](Event ev) {
	auto content = ev.content().get();
	return content.contains("url")
	? std::string(content["url"])
	: "";
	});
	}

	auto Room::setLocalDraft(std::string localDraft) const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(UpdateRoomAction{+roomId(), SetLocalDraftAction{localDraft}});
	}

	auto Room::sendMessage(Event msg) const
	-> PromiseT
	{
	using namespace CursorOp;
	auto hasCrypto = ~sdkCursor().map([](const auto &sdk) -> bool {
	return sdk.c().crypto.has_value();
	});
	auto roomEncrypted = ~roomCursor()[&RoomModel::encrypted];
	auto noFullMembers = ~roomCursor()[&RoomModel::membersFullyLoaded]
	.map([](auto b) { return !b; });

	auto rid = +roomId();

	// Don't use m_ctx directly in the callbacks
	// as `this` may have been destroyed when
	// the callbacks are called.
	auto ctx = m_ctx;

	auto promise = ctx.createResolvedPromise(true);

	// If we do not need encryption just send it as-is
	if (! +allCursors(hasCrypto, roomEncrypted)) {
	return promise
	.then([ctx, rid, msg](auto succ) {
	if (! succ) {
	return ctx.createResolvedPromise(false);
	}
	return ctx.dispatch(SendMessageAction{rid, msg});
	});
	}

	if (! m_deps) {
	return ctx.createResolvedPromise({false, json{{"error", "missing-deps"}}});
	}

	auto deps = m_deps.value();

	promise = promise.then([ctx, rid, msg](auto) {
	return ctx.dispatch(SaveLocalEchoAction{rid, msg});
	});

	auto saveLocalEchoPromise = promise;

	// If the room member list is not complete, load it fully first.
	if (+allCursors(hasCrypto, roomEncrypted, noFullMembers)) {
	kzo.client.dbg() << "The members of " << rid
	<< " are not fully loaded." << std::endl;

	promise = promise
	.then([ctx, rid](auto) { // SaveLocalEchoAction can't fail
	return ctx.dispatch(GetRoomStatesAction{rid});
	})
	.then([ctx, rid](auto succ) {
	if (! succ) {
	kzo.client.warn() << "Loading members of " << rid
	<< " failed." << std::endl;
	return ctx.createResolvedPromise(false);
	} else {
	// XXX remove the hard-coded initialSync parameter
	return ctx.dispatch(QueryKeysAction{true})
	.then([](auto succ) {
	if (! succ) {
	kzo.client.warn() << "Query keys failed" << std::endl;
	}
	return succ;
	});
	}
	});
	}

	auto encryptEvent = [ctx, rid, msg, deps](auto &&status) {
	if (! status) { return ctx.createResolvedPromise(status); }

	kzo.client.dbg() << "encrypting megolm" << std::endl;

	auto &rg = lager::get<RandomInterface &>(deps);

	return ctx.dispatch(EncryptMegOlmEventAction{
	rid,
	msg,
	currentTimeMs(),
	rg.generateRange<RandomData>(EncryptMegOlmEventAction::maxRandomSize())
	});
	};

	auto saveEncryptedLocalEcho = [saveLocalEchoPromise, msg, rid, ctx](auto &&status) mutable {
	if (! status) { return ctx.createResolvedPromise(status); }

	return saveLocalEchoPromise
	.then([status, msg, rid, ctx](auto &&st) {
	auto txnId = st.dataStr("txnId");
	kzo.client.dbg() << "saving encrypted local echo with txn id " << txnId << std::endl;

	auto encrypted = status.dataJson("encrypted");
	auto decrypted = msg.originalJson();
	auto event = Event(encrypted).setDecryptedJson(decrypted, Event::Decrypted);

	return ctx.dispatch(SaveLocalEchoAction{rid, event, txnId});
	})
	.then([status](auto &&) {
	return status;
	});
	};

	auto maybeSendKeys = [ctx, rid, r=toEventLoop(), deps](auto status) {
	if (! status) { return ctx.createResolvedPromise(status); }

	auto encryptedEvent = status.dataJson("encrypted");
	auto content = encryptedEvent.at("content");

	auto ret = ctx.createResolvedPromise({});
	if (status.data().get().contains("key")) {
	kzo.client.dbg() << "megolm session rotated, sending session key" << std::endl;

	auto key = status.dataStr("key");
	ret = ret
	.then([rid, r, key, ctx, deps, sessionId=content.at("session_id")](auto &&) {
	auto members = (+r.roomCursor()).joinedMemberIds();
	auto client = (+r.sdkCursor()).c();
	using DeviceMapT = immer::map<std::string, immer::flex_vector<std::string>>;

	auto devicesToSend = accumulate(
	members, DeviceMapT{}, [client](auto map, auto uid) {
	return std::move(map)
	.set(uid, client.devicesToSendKeys(uid));
	});
	auto &rg = lager::get<RandomInterface &>(deps);

	return ctx.dispatch(ClaimKeysAction{
	rid, sessionId, key, devicesToSend,
	rg.generateRange<RandomData>(ClaimKeysAction::randomSize(devicesToSend))
	})
	.then([rid, ctx, deps, devicesToSend](auto status) {
	if (! status) { return ctx.createResolvedPromise({}); }

	kzo.client.dbg() << "olm-encrypting key event" << std::endl;

	auto keyEv = status.dataJson("keyEvent");
	auto &rg = lager::get<RandomInterface &>(deps);

	return ctx.dispatch(PrepareForSharingRoomKeyAction{
	rid,
	devicesToSend, keyEv,
	rg.generateRange<RandomData>(EncryptOlmEventAction::randomSize(devicesToSend))
	});
	})
	.then([ctx, r, devicesToSend, rid](auto status) {
	if (! status) { return ctx.createResolvedPromise({}); }
	auto txnId = status.dataStr("txnId");
	return r.sendPendingKeyEvent(txnId);
	});
	});
	}
	return ret
	.then([ctx, prevStatus=status](auto status) {
	if (! status) { return status; }
	return prevStatus;
	});
	};

	auto sendEncryptedEvent = [ctx, rid, saveLocalEchoPromise, msg](auto status) mutable {
	if (! status) { return ctx.createResolvedPromise(status); }
	return saveLocalEchoPromise.then([ctx, rid, status, msg](auto st) {
	auto txnId = st.dataStr("txnId");
	kzo.client.dbg() << "sending encrypted message with txn id " << txnId << std::endl;
	auto encrypted = status.dataJson("encrypted");
	auto decrypted = msg.originalJson();
	auto event = Event(encrypted).setDecryptedJson(decrypted, Event::Decrypted);

	return ctx.dispatch(SendMessageAction{rid, event, txnId});
	});
	};

	auto maybeSetStatusToFailed = [ctx, saveLocalEchoPromise, rid](const auto &st) mutable {
	if (st.success()) {
	return ctx.createResolvedPromise(st);
	}

	return saveLocalEchoPromise
	.then([rid, ctx](const auto &saveLocalEchoStatus) {
	auto txnId = saveLocalEchoStatus.dataStr("txnId");
	return ctx.dispatch(UpdateLocalEchoStatusAction{rid, txnId, LocalEchoDesc::Failed});
	})
	.then([st](const auto &) { // can't fail
	return st;
	});
	};

	return promise
	.then(encryptEvent)
	.then(saveEncryptedLocalEcho)
	.then(maybeSendKeys)
	.then(sendEncryptedEvent)
	.then(maybeSetStatusToFailed);
	}

	auto Room::sendTextMessage(std::string text) const
	-> PromiseT
	{
	json j{
	{"type", "m.room.message"},
	{"content", {
	{"msgtype", "m.text"},
	{"body", text}
	}
	}
	};
	Event e{j};
	return sendMessage(e);
	}

	auto Room::resendMessage(std::string txnId) const
	-> PromiseT
	{
	return m_ctx.createResolvedPromise({})
	.then([that=toEventLoop()](const auto &) {
	kzo.client.dbg() << "resending all pending key events" << std::endl;
	return that.sendAllPendingKeyEvents();
	})
	.then([that=toEventLoop(), txnId](const auto &sendKeyStatus) {
	if (!sendKeyStatus.success()) {
	kzo.client.warn() << "resending all pending key events failed" << std::endl;
	return that.m_ctx.createResolvedPromise(sendKeyStatus);
	}
	auto maybeLocalEcho = that.roomCursor().map([txnId](const auto &room) {
	return room.getLocalEchoByTxnId(txnId);
	}).make();
	auto roomEncrypted = that.roomCursor()[&RoomModel::encrypted].make();

	if (!maybeLocalEcho.get()) {
	return that.m_ctx.createResolvedPromise({false, json{
	{"errorCode", "MOE_KAZV_MXC_NO_SUCH_TXNID"},
	{"error", "No such txn id"}
	}});
	}
	auto localEcho = maybeLocalEcho.get().value();
	auto event = localEcho.event;
	auto rid = that.roomId().make().get();
	if ((roomEncrypted.get() && event.encrypted()) \|\| !roomEncrypted.get()) {
	kzo.client.info() << "resending message with txn id " << localEcho.txnId << std::endl;
	return that.m_ctx.dispatch(SendMessageAction{rid, event, localEcho.txnId});
	} else {
	kzo.client.info() << "room encrypted but event isn't, just resend everything" << std::endl;
	return that.m_ctx.dispatch(RoomListAction{UpdateRoomAction{rid, RemoveLocalEchoAction{localEcho.txnId}}})
	.then([localEcho, that](auto) { // Can't fail
	return that.sendMessage(localEcho.event);
	});
	}
	});
	}

	auto Room::redactEvent(std::string eventId, std::optional<std::string> reason) const -> PromiseT
	{
	return m_ctx.dispatch(RedactEventAction{
	roomId().make().get(),
	eventId,
	reason
	});
	}

	auto Room::sendPendingKeyEvent(std::string txnId) const -> PromiseT
	{
	return m_ctx.createResolvedPromise({})
	.then([txnId, r=toEventLoop()](auto &&) {
	auto ctx = r.m_ctx;
	auto rid = r.roomId().make().get();
	kzo.client.dbg() << "sending key event as to-device message" << std::endl;

	kzo.client.dbg() << "txnId of key event: " << txnId << std::endl;
	auto maybePending = r.roomCursor().make().get().getPendingRoomKeyEventByTxnId(txnId);
	if (!maybePending.has_value()) {
	kzo.client.warn() << "No such pending room key event";
	return ctx.createResolvedPromise(EffectStatus(/* succ = */ false, json::object(
	{{"errorCode", "MOE_KAZV_MXC_NO_SUCH_PENDING_ROOM_KEY_EVENT"},
	{"error", "No such pending room key event"}}
	)));
	}
	auto pending = maybePending.value();
	auto event = pending.event;
	return ctx.dispatch(SendToDeviceMessageAction{event, pending.devices})
	.then([ctx, rid, txnId](const auto &sendToDeviceStatus) {
	if (!sendToDeviceStatus.success()) {
	return ctx.createResolvedPromise(sendToDeviceStatus);
	} else {
	return ctx.dispatch(UpdateRoomAction{rid, RemovePendingRoomKeyAction{txnId}});
	}
	});
	});
	}

	auto Room::sendAllPendingKeyEvents() const -> PromiseT
	{
	return m_ctx.createResolvedPromise({})
	.then([r=toEventLoop()](auto &&) {
	auto pendingEvents = r.pendingRoomKeyEvents().make().get();
	if (pendingEvents.empty()) {
	return r.m_ctx.createResolvedPromise(EffectStatus(/* succ = */ true));
	} else {
	auto txnId = pendingEvents[0].txnId;
	return r.sendPendingKeyEvent(txnId)
	.then([r, txnId](const auto &stat) {
	if (!stat.success()) {
	kzo.client.warn() << "Can't send pending key event of txnId " << txnId << std::endl;
	return r.m_ctx.createResolvedPromise(stat);
	}
	return r.sendAllPendingKeyEvents();
	});
	}
	});
	}

	auto Room::refreshRoomState() const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(GetRoomStatesAction{+roomId()});
	}

	auto Room::getStateEvent(std::string type, std::string stateKey) const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(GetStateEventAction{+roomId(), type, stateKey});
	}

	auto Room::sendStateEvent(Event state) const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(SendStateEventAction{+roomId(), state});
	}

	auto Room::setName(std::string name) const
	-> PromiseT
	{
	json j{
	{"type", "m.room.name"},
	{"content", {
	{"name", name}
	}
	}
	};
	Event e{j};
	return sendStateEvent(e);
	}

	auto Room::setTopic(std::string topic) const
	-> PromiseT
	{
	json j{
	{"type", "m.room.topic"},
	{"content", {
	{"topic", topic}
	}
	}
	};
	Event e{j};
	return sendStateEvent(e);
	}

	auto Room::invite(std::string userId) const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(InviteToRoomAction{+roomId(), userId});
	}

	auto Room::typingUsers() const -> lager::reader<immer::flex_vector<std::string>>
	{
	using namespace lager::lenses;
	return ephemeral("m.typing")
	.xform(eventContent
	\| jsonAtOr("user_ids", immer::flex_vector<std::string>{}));
	}

	auto Room::typingMemberEvents() const -> lager::reader<EventList>
	{
	return lager::with(typingUsers(), roomCursor()[&RoomModel::stateEvents])
	.map([](const auto &userIds, const auto &events) {
	return intoImmer(EventList{}, zug::map([events](const auto &id) {
	return events[KeyOfState{"m.room.member", id}];
	}), userIds);
	});
	}

	auto Room::setTyping(bool typing, std::optional<int> timeoutMs) const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(SetTypingAction{+roomId(), typing, timeoutMs});
	}

	auto Room::leave() const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(LeaveRoomAction{+roomId()});
	}

	auto Room::forget() const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(ForgetRoomAction{+roomId()});
	}

	auto Room::kick(std::string userId, std::optional<std::string> reason) const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(KickAction{+roomId(), userId, reason});
	}

	auto Room::ban(std::string userId, std::optional<std::string> reason) const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(BanAction{+roomId(), userId, reason});
	}

	auto Room::unban(std::string userId/, std::optional<std::string> reason/) const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(UnbanAction{+roomId(), userId});
	}

	auto Room::setAccountData(Event accountDataEvent) const -> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(SetAccountDataPerRoomAction{+roomId(), accountDataEvent});
	}

	auto Room::tags() const -> lager::reader<immer::map<std::string, double>>
	{
	return roomCursor().map(&RoomModel::tags);
	}

	auto Room::addOrSetTag(std::string tagId, std::optional<double> order) const -> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.createResolvedPromise({})
	.then([that=toEventLoop(), tagId, order](auto) {
	return that.setAccountData((+that.roomCursor()).makeAddTagEvent(tagId, order));
	});
	}

	auto Room::removeTag(std::string tagId) const -> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.createResolvedPromise({})
	.then([that=toEventLoop(), tagId](auto) {
	return that.setAccountData((+that.roomCursor()).makeRemoveTagEvent(tagId));
	});
	}

	auto Room::setPinnedEvents(immer::flex_vector<std::string> eventIds) const
	-> PromiseT
	{
	json j{
	{"type", "m.room.pinned_events"},
	{"content", {
	{"pinned", eventIds}
	}
	}
	};
	Event e{j};
	return sendStateEvent(e);
	}

	+ auto Room::timelineEventIds() const -> lager::reader<immer::flex_vector<std::string>>
	+ {
	+ return roomCursor()[&RoomModel::timeline];
	+ }
	+
	+ auto Room::messagesMap() const -> lager::reader<immer::map<std::string, Event>>
	+ {
	+ return roomCursor()[&RoomModel::messages];
	+ }
	+
	+ auto Room::timelineEvents() const -> lager::reader<immer::flex_vector<Event>>
	+ {
	+ return roomCursor()
	+ .xform(zug::map([](auto r) {
	+ auto messages = r.messages;
	+ auto timeline = r.timeline;
	+ return intoImmer(
	+ immer::flex_vector<Event>{},
	+ zug::map([=](auto eventId) {
	+ return messages[eventId];
	+ }),
	+ timeline);
	+ }));
	+ }
	+
	auto Room::timelineGaps() const
	-> lager::reader<immer::map<std::string /* eventId */,
	std::string /* prevBatch */>>
	{
	return roomCursor()[&RoomModel::timelineGaps];
	}

	auto Room::paginateBackFromEvent(std::string eventId) const
	-> PromiseT
	{
	using namespace CursorOp;
	return m_ctx.dispatch(PaginateTimelineAction{
	+roomId(), eventId, std::nullopt});
	}

	auto Room::localEchoes() const -> lager::reader<immer::flex_vector<LocalEchoDesc>>
	{
	return roomCursor()[&RoomModel::localEchoes];
	}

	auto Room::pendingRoomKeyEvents() const -> lager::reader<immer::flex_vector<PendingRoomKeyEvent>>
	{
	return roomCursor()[&RoomModel::pendingRoomKeyEvents];
	}

	auto Room::powerLevels() const -> lager::reader<PowerLevelsDesc>
	{
	return state({"m.room.power_levels", ""})
	.map([](const Event &event) {
	return PowerLevelsDesc(event);
	});
	}
	}
	diff --git a/src/client/room/room.hpp b/src/client/room/room.hpp
	index 642e054..1f6ff1f 100644
	--- a/src/client/room/room.hpp
	+++ b/src/client/room/room.hpp
	@@ -1,747 +1,757 @@
	/*
	* 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 <lager/context.hpp>
	#include <lager/with.hpp>
	#include <lager/constant.hpp>
	#include <lager/lenses/optional.hpp>
	#include <zug/transducer/map.hpp>
	#include <zug/transducer/filter.hpp>
	#include <zug/sequence.hpp>
	#include <immer/flex_vector_transient.hpp>

	#include "debug.hpp"

	#include "sdk-model.hpp"
	#include "client-model.hpp"
	#include "room-model.hpp"
	#include <cursorutil.hpp>
	#include "sdk-model-cursor-tag.hpp"
	#include "random-generator.hpp"
	#include "power-levels-desc.hpp"

	namespace Kazv
	{
	/**
	* Represent a Matrix room.
	*
	* This class has the same constraints as Client.
	*/
	class Room
	{
	public:
	using PromiseT = SingleTypePromise<DefaultRetType>;
	using DepsT = lager::deps<SdkModelCursorKey, RandomInterface &
	#ifdef KAZV_USE_THREAD_SAFETY_HELPER
	, EventLoopThreadIdKeeper &
	#endif
	>;
	using ContextT = Context<ClientAction>;

	struct InEventLoopTag {};

	/**
	* Constructor.
	*
	* Construct the room with @c roomId .
	*
	* `sdk` and `roomId` must be cursors in the same thread.
	*
	* The constructed room will be in the same thread as `sdk` and `roomId`.
	*
	* @warning Do not use this directly. Use `Client::room()` and
	* `Client::roomBycursor()` instead.
	*/
	Room(lager::reader<SdkModel> sdk,
	lager::reader<std::string> roomId,
	ContextT ctx);

	/**
	* Constructor.
	*
	* Construct the room with @c roomId and with Deps support.
	*
	* `sdk` and `roomId` must be cursors in the same thread.
	*
	* The constructed room will be in the same thread as `sdk` and `roomId`.
	*
	* @warning Do not use this directly. Use `Client::room()` and
	* `Client::roomBycursor()` instead.
	*/
	Room(lager::reader<SdkModel> sdk,
	lager::reader<std::string> roomId,
	ContextT ctx, DepsT deps);

	/**
	* Construct a Room in the same thread as the event loop.
	*
	* The constructed Room is not constructed from a cursor,
	* and thus copying-constructing from that is thread-safe as long as each thread
	* calls with different objects.
	*
	* this must have Deps support.
	*
	* @warning Do not use this directly. Use `Client::room()` and
	* `Client::roomBycursor()` instead.
	*/
	Room(InEventLoopTag, std::string roomId, ContextT ctx, DepsT deps);

	/**
	* Return a Room that represents the room currently represented by this,
	* but suitable for use in the event loop of the context.
	*
	* This function can only be called from the thread where this belongs.
	*
	* Example:
	*
	* ```
	* auto ctx = sdk.context();
	* auto client = sdk.clientFromSecondaryRoot(sr);
	* auto room = client.room("!room-id:domain.name");
	* room.sendTextMessage("test")
	* .then([r=room.toEventLoop(), ctx](auto &&st) {
	* if (!st) {
	* std::cerr << "Cannot send message" << std::endl;
	* return ctx.createResolvedPromise(st);
	* }
	* return r.sendTextMessage("follow-up");
	* });
	* ```
	*
	* @sa Sdk::clientFromSecondaryRoot , Client::room
	*/
	Room toEventLoop() const;

	/* lager::reader<MapT<KeyOfState, Event>> */
	inline auto stateEvents() const {
	return roomCursor()
	[&RoomModel::stateEvents];
	}

	/**
	* Get the invite_state of this room.
	*
	* @return A lager::reader containing a map from KeyOfState to the event.
	*/
	auto inviteState() const -> lager::reader<immer::map<KeyOfState, Event>>;

	/* lager::reader<std::optional<Event>> */
	inline auto stateOpt(KeyOfState k) const {
	return stateEvents()
	[std::move(k)];
	}

	/* lager::reader<Event> */
	inline auto state(KeyOfState k) const {
	return stateOpt(k)
	[lager::lenses::or_default];
	}

	- /* lager::reader<RangeT<Event>> */
	- inline auto timelineEvents() const {
	- return roomCursor()
	- .xform(zug::map([](auto r) {
	- auto messages = r.messages;
	- auto timeline = r.timeline;
	- return intoImmer(
	- immer::flex_vector<Event>{},
	- zug::map([=](auto eventId) {
	- return messages[eventId];
	- }),
	- timeline);
	- }));
	- }
	+ /**
	+ * Get the timeline event ids of this room in ascending timestamp order.
	+ * It takes constant time for the cursor to be updated.
	+ *
	+ * @return A lager::reader of a RangeT of event ids.
	+ */
	+ auto timelineEventIds() const -> lager::reader<immer::flex_vector<std::string>>;
	+
	+ /**
	+ * Get a map from event ids to events. It takes constant time for the
	+ * cursor to be updated.
	+ *
	+ * @return A lager::reader of a map for all timeline events.
	+ */
	+ auto messagesMap() const -> lager::reader<immer::map<std::string, Event>>;
	+
	+ /**
	+ * Get a list of timeline events in this room. It takes O(timeline.size())
	+ * time for the cursor to be updated.
	+ *
	+ * @return A lager::reader<RangeT<Event>> of timeline events from
	+ * the oldest to the latest.
	+ */
	+ auto timelineEvents() const -> lager::reader<immer::flex_vector<Event>>;

	/**
	* Get one message by the event id.
	*
	* @param A lager::reader of the event id.
	*
	* @return A lager::reader of the event.
	*/
	auto message(lager::reader<std::string> eventId) const -> lager::reader<Event>;

	/**
	* Get the member events of heroes this room.
	*
	* @return a lager::reader of a RangeT of Event containing the member events.
	*/
	auto heroMemberEvents() const -> lager::reader<immer::flex_vector<Event>>;

	/**
	* Get the member events of heroes this room.
	*
	* @return a lager::reader of a RangeT of std::string containing the member events.
	*/
	auto heroDisplayNames() const -> lager::reader<immer::flex_vector<std::string>>;

	/**
	* Get the name of this room.
	*
	* If there is a m.room.name state event, the name in it is used.
	* If there is none, the returned cursor will hold std::nullopt.
	*
	* @return a lager::reader of an optional std::string.
	*/
	auto nameOpt() const -> lager::reader<std::optional<std::string>>;

	/**
	* Get the name of this room.
	*
	* If there is a m.room.name state event, the name in it is used.
	* If there is none, the returned cursor will hold a placeholder string.
	*
	* @return a lager::reader of an std::string.
	*/
	auto name() const -> lager::reader<std::string>;

	/**
	* Get the avatar mxc uri of this room.
	*
	* @return A lager::reader containing the mxc uri of this room.
	*/
	auto avatarMxcUri() const -> lager::reader<std::string>;

	/**
	* Get the list of joined member ids.
	*
	* @return A lager::reader containing an RangeT of the joined members' ids.
	*/
	auto members() const -> lager::reader<immer::flex_vector<std::string>>;

	/**
	* Get the list of invited member ids.
	*
	* @return A lager::reader containing an RangeT of the invited members' ids.
	*/
	auto invitedMembers() const -> lager::reader<immer::flex_vector<std::string>>;

	/**
	* Get the list of knocked member ids.
	*
	* @return A lager::reader containing an RangeT of the knocked members' ids.
	*/
	auto knockedMembers() const -> lager::reader<immer::flex_vector<std::string>>;

	/**
	* Get the list of left member ids.
	*
	* @return A lager::reader containing an RangeT of the left members' ids.
	*/
	auto leftMembers() const -> lager::reader<immer::flex_vector<std::string>>;

	/**
	* Get the list of banned member ids.
	*
	* @return A lager::reader containing an RangeT of the banned members' id.
	*/
	auto bannedMembers() const -> lager::reader<immer::flex_vector<std::string>>;

	/**
	* Get the list of joined member events.
	*
	* @return A lager::reader containing an EventList of the joined members' events.
	*/
	auto joinedMemberEvents() const -> lager::reader<EventList>;

	/**
	* Get the list of invited member events.
	*
	* @return A lager::reader containing an EventList of the invited members' events.
	*/
	auto invitedMemberEvents() const -> lager::reader<EventList>;

	/**
	* Get the list of knocked member events.
	*
	* @return A lager::reader containing an EventList of the knocked members' events.
	*/
	auto knockedMemberEvents() const -> lager::reader<EventList>;

	/**
	* Get the list of left member events.
	*
	* @return A lager::reader containing an EventList of the left members' events.
	*/
	auto leftMemberEvents() const -> lager::reader<EventList>;

	/**
	* Get the list of banned member events.
	*
	* @return A lager::reader containing an EventList of the banned members' events.
	*/
	auto bannedMemberEvents() const -> lager::reader<EventList>;

	/**
	* Get the member event for userId.
	*
	* If membership of the current user is Invite, it prefers
	* the event in inviteState to the one in stateEvents.
	*
	* @return A lager::reader containing the state event.
	*/
	auto memberEventByCursor(lager::reader<std::string> userId) const -> lager::reader<Event>;

	/**
	* Get the member event for userId.
	*
	* If membership of the current user is Invite, it prefers
	* the event in inviteState to the one in stateEvents.
	*
	* @return A lager::reader containing the state event.
	*/
	auto memberEventFor(std::string userId) const -> lager::reader<Event>;

	/**
	* Get whether this room is encrypted.
	*
	* The encryption status is changed to true if the client
	* receives a state event that turns on encryption.
	* If that state event is removed later, the status will
	* not be changed.
	*
	* @return A lager::reader<bool> that contains
	* whether this room is encrypted.
	*/
	lager::reader<bool> encrypted() const;

	/lager::reader<std::string>/
	KAZV_WRAP_ATTR(RoomModel, roomCursor(), roomId);
	/lager::reader<RoomMembership>/
	KAZV_WRAP_ATTR(RoomModel, roomCursor(), membership);
	/lager::reader<std::string>/
	KAZV_WRAP_ATTR(RoomModel, roomCursor(), localDraft);
	/* lager::reader<bool> */
	KAZV_WRAP_ATTR(RoomModel, roomCursor(), membersFullyLoaded);

	/**
	* Get the ids of the heroes of the room.
	*
	* @return a lager::reader of a RangeT<std::string> containing
	* the ids of the heroes of the room.
	*/
	auto heroIds() const -> lager::reader<immer::flex_vector<std::string>>;

	/**
	* Get the joined member count of this room.
	*
	* @return A lager::reader of std::size_t containing the joined
	* member count for this room.
	*/
	auto joinedMemberCount() const -> lager::reader<std::size_t>;

	/**
	* Get the invited member count of this room.
	*
	* @return A lager::reader of std::size_t containing the invited
	* member count for this room.
	*/
	auto invitedMemberCount() const -> lager::reader<std::size_t>;

	/**
	* Set local draft for this room.
	*
	* After the returned Promise is resolved,
	* @c localDraft() will contain @c localDraft .
	*
	* @param localDraft The local draft to send.
	* @return A Promise that resolves when the local draft
	* has been set, or when there is an error.
	*/
	PromiseT setLocalDraft(std::string localDraft) const;

	/**
	* Send an event to this room.
	*
	* @param msg The message to send
	* @return A Promise that resolves when the event has been sent,
	* or when there is an error.
	*/
	PromiseT sendMessage(Event msg) const;

	/**
	* Send a text message to this room.
	*
	* @param text The text
	* @return A Promise that resolves when the text message has
	* been sent, or when there is an error.
	*/
	PromiseT sendTextMessage(std::string text) const;

	/**
	* Resend an event to this room.
	*
	* @param txnId The transaction id of the unsent message
	* @return A Promise that resolves when the event has been sent,
	* or when there is an error.
	*/
	PromiseT resendMessage(std::string txnId) const;

	/**
	* Redact an event.
	*
	* @param eventId The event id of the event you want to redact
	* @param reason The reason of redaction
	* @return A Promise that resolves when the event has been sent,
	* or when there is an error.
	*/
	PromiseT redactEvent(std::string eventId, std::optional<std::string> reason) const;

	/**
	* Send one pending key event in this room.
	*
	* @param txnId The transaction id of the pending key event
	* @return A Promise that resolves when the event has been sent,
	* or when there is an error.
	*/
	PromiseT sendPendingKeyEvent(std::string txnId) const;

	/**
	* Send all pending key events in this room.
	*
	* @return A Promise that resolves when all events has been sent,
	* or when there is an error.
	*/
	PromiseT sendAllPendingKeyEvents() const;

	/**
	* Get the full state of this room.
	*
	* This method will update the Client as needed.
	*
	* After the returned Promise resolves successfully,
	* @c stateEvents() will contain the fetched state.
	*
	* @return A Promise that resolves when the room state
	* has been fetched, or when there is an error.
	*/
	PromiseT refreshRoomState() const;

	/**
	* Get one state event with @c type and @c stateKey .
	*
	* This method will update the Client as needed.
	*
	* After the returned Promise resolves successfully,
	* @c state({type,stateKey}) will contain the fetched
	* state event.
	*
	* @return A Promise that resolves when the state
	* event has been fetched, or when there is an error.
	*/
	PromiseT getStateEvent(std::string type, std::string stateKey) const;

	/**
	* Send a state event to this room.
	*
	* @param state The state event to send.
	* @return A Promise that resolves when the state event
	* has been sent, or when there is an error.
	*/
	PromiseT sendStateEvent(Event state) const;

	/**
	* Set the room name.
	*
	* @param name The new name for this room.
	* @return A Promise that resolves when the state event
	* for the name change has been sent, or when there is an error.
	*/
	PromiseT setName(std::string name) const;

	// lager::reader<std::string>
	inline auto topic() const {
	using namespace lager::lenses;
	return stateEvents()
	[KeyOfState{"m.room.topic", ""}]
	[or_default]
	.xform(eventContent
	\| jsonAtOr("topic"s, ""s));
	}

	/**
	* Set the room topic.
	*
	* @param topic The new topic for this room.
	* @return A Promise that resolves when the state event
	* for the topic change has been sent, or when there is an error.
	*/
	PromiseT setTopic(std::string topic) const;

	/**
	* Invite a user to this room
	*
	* @param userId The user id for the user to invite.
	* @return A Promise that resolves when the state event
	* for the invite has been sent, or when there is an error.
	*/
	PromiseT invite(std::string userId) const;

	/* lager::reader<MapT<std::string, Event>> */
	inline auto ephemeralEvents() const {
	return roomCursor()
	[&RoomModel::ephemeral];
	}

	/* lager::reader<std::optional<Event>> */
	inline auto ephemeralOpt(std::string type) const {
	return roomCursor()
	[&RoomModel::ephemeral]
	[type];
	}

	/* lager::reader<Event> */
	inline auto ephemeral(std::string type) const {
	return roomCursor()
	[&RoomModel::ephemeral]
	[type]
	[lager::lenses::or_default];
	}

	/**
	* Get the ids of all typing users in this room.
	*
	* @return A lager::reader of an RangeT of std::string of ids of all typing users.
	*/
	auto typingUsers() const -> lager::reader<immer::flex_vector<std::string>>;

	/**
	* Get the member events of all typing users in this room.
	*
	* @return A lager::reader of an EventList of member events of all typing users.
	*/
	auto typingMemberEvents() const -> lager::reader<EventList>;

	/**
	* Set the typing status of the current user in this room.
	*
	* @param typing Whether the user is now typing.
	* @param timeoutMs How long this typing status should last,
	* in milliseconds.
	* @return A Promise that resolves when the typing status
	* has been sent, or when there is an error.
	*/
	PromiseT setTyping(bool typing, std::optional<int> timeoutMs) const;

	/* lager::reader<MapT<std::string, Event>> */
	inline auto accountDataEvents() const {
	return roomCursor()
	[&RoomModel::accountData];
	}

	/* lager::reader<std::optional<Event>> */
	inline auto accountDataOpt(std::string type) const {
	return roomCursor()
	[&RoomModel::accountData]
	[type];
	}

	/* lager::reader<Event> */
	inline auto accountData(std::string type) const {
	return roomCursor()
	[&RoomModel::accountData]
	[type]
	[lager::lenses::or_default];
	}

	/* lager::reader<std::string> */
	inline auto readMarker() const {
	using namespace lager::lenses;
	return accountData("m.fully_read")
	.xform(eventContent
	\| jsonAtOr("event_id", std::string{}));
	}

	/**
	* Set the account data for this 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 the tags of the current room.
	*
	* @return A lager::reader of a map from tag id of this room to
	* the corresponding order.
	*/
	auto tags() const -> lager::reader<immer::map<std::string, double>>;

	/**
	* Add or set a tag to this room.
	*
	* @param tagId The tag id to add or set.
	* @param order The order to specify.
	*
	* @return A Promise that resolves when the tag
	* has been set, or when there is an error.
	*/
	PromiseT addOrSetTag(std::string tagId, std::optional<double> order = std::nullopt) const;

	/**
	* Remove a tag from this room.
	*
	* @param tagId The tag id to remove.
	*
	* @return A Promise that resolves when the tag
	* has been removed, or when there is an error.
	*/
	PromiseT removeTag(std::string tagId) const;

	/**
	* Leave this room.
	*
	* @return A Promise that resolves when the state event
	* for the leaving has been sent, or when there is an error.
	*/
	PromiseT leave() const;

	/**
	* Forget this room.
	*
	* One can only forget a room when they have already left it.
	*
	* @return A Promise that resolves when the room has been
	* forgot, or when there is an error.
	*/
	PromiseT forget() const;

	/**
	* Kick a user from this room.
	*
	* You must have enough power levels in this room to do so.
	*
	* @param userId The id of the user that will be kicked.
	* @param reason The reason to explain this kick.
	*
	* @return A Promise that resolves when the kick is done,
	* or when there is an error.
	*/
	PromiseT kick(std::string userId, std::optional<std::string> reason = std::nullopt) const;

	/**
	* Ban a user from this room.
	*
	* You must have enough power levels in this room to do so.
	*
	* @param userId The id of the user that will be banned.
	* @param reason The reason to explain this ban.
	*
	* @return A Promise that resolves when the ban is done,
	* or when there is an error.
	*/
	PromiseT ban(std::string userId, std::optional<std::string> reason = std::nullopt) const;

	// TODO: v1.1 adds reason field
	/**
	* Unban a user from this room.
	*
	* You must have enough power levels in this room to do so.
	*
	* @param userId The id of the user that will be unbanned.
	*
	* @return A Promise that resolves when the unban is done,
	* or when there is an error.
	*/
	PromiseT unban(std::string userId/, std::optional<std::string> reason = std::nullopt/) const;

	/* lager::reader<JsonWrap> */
	inline auto avatar() const {
	return state(KeyOfState{"m.room.avatar", ""})
	.xform(eventContent);
	}

	/* lager::reader<RangeT<std::string>> */
	inline auto pinnedEvents() const {
	return state(KeyOfState{"m.room.pinned_events", ""})
	.xform(eventContent
	\| jsonAtOr("pinned", immer::flex_vector<std::string>{}));
	}

	/**
	* Set pinned events of this room
	*
	* @param eventIds The event ids of the new pinned events
	*
	* @return A Promise that resolves when the state event
	* for the pinned events change has been sent, or when there is an error.
	*/
	PromiseT setPinnedEvents(immer::flex_vector<std::string> eventIds) const;

	/**
	* Get the Gaps in the timeline for this room.
	*
	* Any key of the map in the returned reader can be send as
	* an argument of paginateBackFromEvent() to try to fill the Gap
	* at that event.
	*
	* @return A lager::reader that contains an evnetId-to-prevBatch map.
	*/
	lager::reader<immer::map<std::string /* eventId /, std::string / prevBatch */>> timelineGaps() const;

	/**
	* Try to paginate back from @c eventId.
	*
	* @param eventId An event id that is in the key of `+timelineGaps()`.
	*
	* @return A Promise that resolves when the pagination is
	* successful, or when there is an error. If it is successful,
	* `+timelineGaps()` will no longer contain eventId as key, and
	* `timeline()` will contain the events before eventId in the
	* full event chain on the homeserver.
	* If `eventId` is not in `+timelineGaps()`, it is considered
	* to be failed.
	*/
	PromiseT paginateBackFromEvent(std::string eventId) const;

	/**
	* Get the list of local echoes in this room.
	*
	* @return A lager::reader that contains the list of all local echoes in the room.
	* The event type will always be m.room.message and event id will not be meaningful.
	*/
	auto localEchoes() const -> lager::reader<immer::flex_vector<LocalEchoDesc>>;

	/**
	* Get the list of pending room key events in this room.
	*
	* @return A lager::reader that contains the list of all pending room key events in the room.
	* The event type will always be m.room.encrypted and event id will not be meaningful.
	*/
	auto pendingRoomKeyEvents() const -> lager::reader<immer::flex_vector<PendingRoomKeyEvent>>;

	/**
	* Get the power levels of this room.
	*
	* @return A lager::reader that contains a PowerLevelDesc describing the power levels of this room.
	*/
	auto powerLevels() const -> lager::reader<PowerLevelsDesc>;

	private:
	const lager::reader<SdkModel> &sdkCursor() const;
	const lager::reader<RoomModel> &roomCursor() const;
	lager::reader<RoomModel> makeRoomCursor() const;
	std::string currentRoomId() const;
	/// if membership is invite, return inviteState; otherwise return stateEvents
	lager::reader<immer::map<KeyOfState, Event>> inviteStateOrState() const;
	/// if membership is invite and inviteState[key] exists, return inviteState[key], otherwise return stateEvents[key]
	lager::reader<Event> inviteStateOrStateEvent(lager::reader<KeyOfState> key) const;

	std::optional<lager::reader<SdkModel>> m_sdk;
	std::variant<lager::reader<std::string>, std::string> m_roomId;

	ContextT m_ctx;
	std::optional<DepsT> m_deps;
	lager::reader<RoomModel> m_roomCursor;
	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/client/room-test.cpp b/src/tests/client/room-test.cpp
	index ccd5611..2f21adf 100644
	--- a/src/tests/client/room-test.cpp
	+++ b/src/tests/client/room-test.cpp
	@@ -1,412 +1,435 @@
	/*
	* 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 <catch2/catch_all.hpp>

	#include <lager/event_loop/boost_asio.hpp>
	#include <boost/asio.hpp>

	#include <sdk.hpp>
	#include <cprjobhandler.hpp>
	#include <lagerstoreeventemitter.hpp>
	#include <asio-promise-handler.hpp>

	#include "client-test-util.hpp"

	#include "factory.hpp"

	using namespace Kazv;
	using namespace Kazv::Factory;

	TEST_CASE("Result of Room::toEventLoop() should not vary with the original cursor", "[client][room]")
	{
	auto io = boost::asio::io_context{};
	auto jh = Kazv::CprJobHandler{io.get_executor()};
	auto ee = Kazv::LagerStoreEventEmitter(lager::with_boost_asio_event_loop{io.get_executor()});

	auto roomWithId = [](std::string roomId) {
	auto r = RoomModel{};
	r.roomId = roomId;
	return r;
	};

	auto initModel = Kazv::SdkModel{};
	initModel.client.roomList.rooms = std::move(initModel.client.roomList.rooms)
	.set("!foo:example.org", roomWithId("!foo:example.org"))
	.set("!bar:example.org", roomWithId("!bar:example.org"));
	auto sdk = Kazv::makeSdk(
	initModel,
	jh,
	ee,
	Kazv::AsioPromiseHandler{io.get_executor()},
	zug::identity
	);

	auto ctx = sdk.context();

	auto client = sdk.client();

	auto roomId = lager::make_state(std::string("!foo:example.org"), lager::automatic_tag{});

	auto room = client.roomByCursor(roomId);

	using namespace Kazv::CursorOp;

	REQUIRE(+room.roomId() == "!foo:example.org");

	auto roomInEventLoop = room.toEventLoop();

	REQUIRE(+roomInEventLoop.roomId() == "!foo:example.org");

	roomId.set("!bar:example.org");

	REQUIRE(+room.roomId() == "!bar:example.org");
	REQUIRE(+roomInEventLoop.roomId() == "!foo:example.org");
	}

	static const std::string exampleRoomId = "!example:example.org";

	static auto memberFoo = Event(R"(
	{
	"content": {
	"displayname": "foo's name",
	"membership": "join"
	},
	"event_id": "some id2",
	"room_id": "!example:example.org",
	"type": "m.room.member",
	"state_key": "@foo:example.org"
	})"_json);

	static auto memberBar = Event(R"(
	{
	"content": {
	"displayname": "bar's name",
	"membership": "join"
	},
	"event_id": "some id3",
	"room_id": "!example:example.org",
	"type": "m.room.member",
	"state_key": "@foo:example.org"
	})"_json);

	static auto exampleRoomWithoutNameEvent()
	{
	RoomModel model;
	model.membership = RoomMembership::Join;
	model.roomId = "!example:example.org";
	model.stateEvents = model.stateEvents
	.set({"m.room.member", "@foo:example.org"}, memberFoo)
	.set({"m.room.member", "@bar:example.org"}, memberBar);
	model.heroIds = {"@foo:example.org", "@bar:example.org"};
	return model;
	}

	static auto roomNameEvent = Event(R"(
	{
	"content": {
	"name": "some name"
	},
	"event_id": "some id",
	"room_id": "!example:example.org",
	"type": "m.room.name",
	"state_key": ""
	})"_json);

	// https://spec.matrix.org/v1.7/client-server-api/#mroomavatar
	static Event avatarEvent = R"({
	"content": {
	"info": {
	"h": 398,
	"mimetype": "image/jpeg",
	"size": 31037,
	"w": 394
	},
	"url": "mxc://example.org/JWEIFJgwEIhweiWJE"
	},
	"event_id": "$143273582443PhrSn:example.org",
	"origin_server_ts": 1432735824653,
	"room_id": "!jEsUZKDJdhlrceRyVU:example.org",
	"sender": "@example:example.org",
	"state_key": "",
	"type": "m.room.avatar",
	"unsigned": {
	"age": 1234
	}
	})"_json;

	static auto exampleRoomWithNameEvent()
	{
	auto model = exampleRoomWithoutNameEvent();
	model.stateEvents = model.stateEvents
	.set({"m.room.name", ""}, roomNameEvent);
	return model;
	};

	static auto sdkWith(RoomModel room)
	{
	SdkModel model;
	model.client.roomList.rooms = model.client.roomList.rooms.set(room.roomId, room);
	return model;
	}

	static auto makeRoomWithDumbContext(RoomModel room)
	{
	auto cursor = lager::make_constant(sdkWith(room));
	auto nameCursor = lager::make_constant(room.roomId);
	return Room(cursor, nameCursor, dumbContext());
	}

	TEST_CASE("Room::nameOpt()", "[client][room][getter]")
	{
	WHEN("the room has a name") {
	auto room = makeRoomWithDumbContext(exampleRoomWithNameEvent());
	THEN("it should give out the name") {
	auto val = room.nameOpt().make().get();
	REQUIRE(val.has_value());
	REQUIRE(val.value() == "some name");
	}
	}

	WHEN("the room has no name") {
	auto room = makeRoomWithDumbContext(exampleRoomWithoutNameEvent());
	THEN("it should give out nullopt") {
	auto val = room.nameOpt().make().get();
	REQUIRE(!val.has_value());
	}
	}
	}

	TEST_CASE("Room::heroMemberEvents()", "[client][room][getter]")
	{
	auto room = makeRoomWithDumbContext(exampleRoomWithNameEvent());
	THEN("it should give out the events") {
	auto val = room.heroMemberEvents().make().get();
	REQUIRE(val.size() == 2);
	REQUIRE(std::any_of(val.begin(), val.end(),
	[](const auto &v) {
	return v.id() == "some id2";
	}));
	REQUIRE(std::any_of(val.begin(), val.end(),
	[](const auto &v) {
	return v.id() == "some id3";
	}));
	}
	}

	TEST_CASE("Room::heroDisplayNames()", "[client][room][getter]")
	{
	auto room = makeRoomWithDumbContext(exampleRoomWithNameEvent());
	THEN("it should give out the names") {
	auto val = room.heroDisplayNames().make().get();
	REQUIRE(val.size() == 2);
	REQUIRE(std::any_of(val.begin(), val.end(),
	[](const auto &v) {
	return v == "foo's name";
	}));
	REQUIRE(std::any_of(val.begin(), val.end(),
	[](const auto &v) {
	return v == "bar's name";
	}));
	}
	}

	TEST_CASE("Room::encrypted()", "[client][room][getter]")
	{
	auto roomModel = exampleRoomWithNameEvent();
	WHEN("the room is encrypted") {
	roomModel.encrypted = true;
	auto room = makeRoomWithDumbContext(roomModel);
	THEN("it should give out true") {
	auto val = room.encrypted().make().get();
	REQUIRE(val);
	}
	}

	WHEN("the room is not encrypted") {
	roomModel.encrypted = false;
	auto room = makeRoomWithDumbContext(roomModel);
	THEN("it should give out false") {
	auto val = room.encrypted().make().get();
	REQUIRE(!val);
	}
	}
	}

	TEST_CASE("Room::avatarMxcUri()", "[client][room][getter]")
	{
	auto roomModel = exampleRoomWithoutNameEvent();
	roomModel.stateEvents = roomModel.stateEvents.set(KeyOfState{"m.room.avatar", ""}, avatarEvent);

	auto room = makeRoomWithDumbContext(roomModel);
	REQUIRE(room.avatarMxcUri().make().get() == "mxc://example.org/JWEIFJgwEIhweiWJE");
	}

	TEST_CASE("Room::typingMemberEvents()", "[client][room][getter][ephemeral]")
	{
	auto roomModel = exampleRoomWithoutNameEvent();
	auto typingJson = R"({
	"content": {
	"user_ids": ["@foo:example.org", "@bar:example.org"]
	},
	"type": "m.typing"
	})"_json;
	roomModel.ephemeral = roomModel.ephemeral.set("m.typing", Event{typingJson});

	auto room = makeRoomWithDumbContext(roomModel);
	REQUIRE(room.typingMemberEvents().make().get() == EventList{
	room.memberEventFor("@foo:example.org").make().get(),
	room.memberEventFor("@bar:example.org").make().get(),
	});
	}

	TEST_CASE("Room::message()", "[client][room][getter][timeline]")
	{
	auto roomModel = exampleRoomWithoutNameEvent();
	auto messageEvent = Event(R"({
	"content": {
	"body": "This is an example text message",
	"msgtype": "m.text",
	"format": "org.matrix.custom.html",
	"formatted_body": "<b>This is an example text message</b>"
	},
	"type": "m.room.message",
	"event_id": "$anothermessageevent:example.org",
	"room_id": "!726s6s6q:example.com",
	"sender": "@example:example.org",
	"origin_server_ts": 1432735824653,
	"unsigned": {
	"age": 1234
	}
	})"_json);
	roomModel.messages = roomModel.messages.set(messageEvent.id(), messageEvent);

	auto room = makeRoomWithDumbContext(roomModel);
	REQUIRE(room.message(lager::make_constant(messageEvent.id())).make().get() == messageEvent);
	}

	TEST_CASE("Room::memberEventFor(), Room::memberEventByCursor", "[client][room][getter][state]")
	{
	auto roomModel = exampleRoomWithoutNameEvent();
	auto memberFooJson = memberFoo.raw().get();
	memberFooJson["content"]["displayname"] = "some other name";
	auto newMemberFooEvent = Event(memberFooJson);
	roomModel.inviteState = roomModel.inviteState
	.set({"m.room.member", "@foo:example.org"}, newMemberFooEvent);

	WHEN("membership is Invite")
	{
	roomModel.membership = RoomMembership::Invite;
	auto room = makeRoomWithDumbContext(roomModel);
	THEN("should prefer inviteState")
	{
	REQUIRE(room.memberEventFor("@foo:example.org").make().get() == newMemberFooEvent);
	REQUIRE(room.memberEventFor("@bar:example.org").make().get() == memberBar);
	}
	}

	WHEN("membership is not Invite")
	{
	roomModel.membership = RoomMembership::Leave;
	auto room = makeRoomWithDumbContext(roomModel);
	THEN("should ignore inviteState")
	{
	REQUIRE(room.memberEventFor("@foo:example.org").make().get() == memberFoo);
	REQUIRE(room.memberEventFor("@bar:example.org").make().get() == memberBar);
	}
	}
	}

	TEST_CASE("Room::name(), Room::nameOpt()", "[client][room][getter][state]")
	{
	auto roomModel = exampleRoomWithoutNameEvent();
	WHEN("membership is invite and invite state contains name event")
	{
	roomModel.membership = RoomMembership::Invite;
	roomModel.inviteState = roomModel.inviteState.set({"m.room.name", ""}, roomNameEvent);
	auto room = makeRoomWithDumbContext(roomModel);
	THEN("it should give that name")
	{
	auto expectedName = roomNameEvent.content().get()["name"].template get<std::string>();
	REQUIRE(room.nameOpt().make().get().value() == expectedName);
	REQUIRE(room.name().make().get() == expectedName);
	}
	}

	WHEN("membership is not invite and invite state contains the name event")
	{
	roomModel.membership = RoomMembership::Join;
	roomModel.inviteState = roomModel.inviteState.set({"m.room.name", ""}, roomNameEvent);
	auto room = makeRoomWithDumbContext(roomModel);
	THEN("it should ignore that name")
	{
	REQUIRE(!room.nameOpt().make().get().has_value());
	REQUIRE(room.name().make().get() == "<no name>");
	}
	}
	}

	TEST_CASE("Room::avatarMxcUri()", "[client][room][getter][state]")
	{
	auto roomModel = exampleRoomWithoutNameEvent();
	roomModel.inviteState = roomModel.inviteState.set({"m.room.avatar", ""}, avatarEvent);
	WHEN("membership is invite and invite state contains name event")
	{
	roomModel.membership = RoomMembership::Invite;
	auto room = makeRoomWithDumbContext(roomModel);
	THEN("it should give that avatar")
	{
	auto expectedAvatar = avatarEvent.content().get()["url"].template get<std::string>();
	REQUIRE(room.avatarMxcUri().make().get() == expectedAvatar);
	}
	}

	WHEN("membership is not invite and invite state contains the name event")
	{
	roomModel.membership = RoomMembership::Join;
	auto room = makeRoomWithDumbContext(roomModel);
	THEN("it should ignore that avatar")
	{
	REQUIRE(room.avatarMxcUri().make().get() == "");
	}
	}
	}

	TEST_CASE("Room::joinedMemberEvents()", "[client][room][getter][state]")
	{
	auto members = immer::flex_vector<Event>{makeMemberEvent(), makeMemberEvent(), makeMemberEvent()};
	auto roomModel = makeRoom(
	withRoomState(members)
	\| withRoomState({
	makeMemberEvent(withMembership("leave")),
	makeMemberEvent(withMembership("invite")),
	makeMemberEvent(withMembership("ban")),
	})
	);

	auto room = makeRoomWithDumbContext(roomModel);
	THEN("it returns the joined members only")
	{
	REQUIRE_THAT(room.joinedMemberEvents().make().get(), Catch::Matchers::UnorderedRangeEquals(members));
	}
	}

	TEST_CASE("Room::powerLevels()", "[client][room][state][power-levels]")
	{
	auto content = json{
	{"users", {{"@foo:example.com", 40}}},
	};

	auto powerLevelsEvent = makeEvent(
	withEventType("m.room.power_levels")
	\| withEventContent(content)
	);
	auto roomModel = makeRoom(withRoomState({powerLevelsEvent}));
	auto room = makeRoomWithDumbContext(roomModel);
	REQUIRE(room.powerLevels().make().get().originalEvent() == powerLevelsEvent);
	}
	+
	+TEST_CASE("Room::{timelineEvents,timelineEventIds,messagesMap}()", "[client][room][getter][timeline]")
	+{
	+ auto timelineEvents = immer::flex_vector<Event>{makeEvent(), makeEvent(), makeEvent()};
	+ auto timelineEventIds = intoImmer(
	+ immer::flex_vector<std::string>{},
	+ zug::map([](const auto &ev) { return ev.id(); }),
	+ timelineEvents
	+ );
	+ auto messagesMap = intoImmer(
	+ immer::map<std::string, Event>{},
	+ zug::map([](const auto &ev) { return std::make_pair(ev.id(), ev); }),
	+ timelineEvents
	+ );
	+ auto roomModel = makeRoom(
	+ withRoomTimeline(timelineEvents)
	+ );
	+
	+ auto room = makeRoomWithDumbContext(roomModel);
	+ REQUIRE(room.timelineEvents().make().get() == timelineEvents);
	+ REQUIRE(room.timelineEventIds().make().get() == timelineEventIds);
	+ REQUIRE(room.messagesMap().make().get() == messagesMap);
	+}

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