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	diff --git a/src/client/room/room-model.cpp b/src/client/room/room-model.cpp
	index 4d6ca72..fc3b25a 100644
	--- a/src/client/room/room-model.cpp
	+++ b/src/client/room/room-model.cpp
	@@ -1,764 +1,771 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <libkazv-config.hpp>


	#include <lager/util.hpp>
	#include <zug/sequence.hpp>
	#include <zug/transducer/map.hpp>
	#include <zug/transducer/filter.hpp>

	#include "debug.hpp"

	#include "room-model.hpp"
	#include "cursorutil.hpp"
	#include "immer-utils.hpp"

	inline const auto receiptTypes = immer::flex_vector<std::string>{"m.read", "m.read.private"};

	template<class Func>
	static std::string getMaxInTimeline(std::string a, std::string b, Func sortKey)
	{
	if (a.empty() && b.empty()) {
	return std::string();
	} else {
	// for an unexisting event, event id is empty and timestamp is 0
	// for an existing event, event id is not empty and timestamp >= 0
	// so this handles all cases even when we do not have the corresponding event
	return std::max(a, b, [=](const std::string &x, const std::string &y) {
	return sortKey(x) < sortKey(y);
	});
	}
	}

	namespace Kazv
	{
	PendingRoomKeyEvent makePendingRoomKeyEventV0(std::string txnId, Event event, immer::map<std::string, immer::flex_vector<std::string>> devices)
	{
	immer::map<std::string, immer::map<std::string, Event>> messages;
	for (auto [userId, deviceIds] : devices) {
	messages = setIn(std::move(messages), immer::map<std::string, Event>(), userId);
	for (auto deviceId : deviceIds) {
	messages = setIn(
	std::move(messages),
	event,
	userId, deviceId
	);
	}
	}
	return PendingRoomKeyEvent{txnId, messages};
	}

	auto sortKeyForTimelineEvent(Event e) -> std::tuple<Timestamp, std::string>
	{
	return std::make_tuple(e.originServerTs(), e.id());
	}

	RoomModel RoomModel::update(RoomModel r, Action a)
	{
	return lager::match(std::move(a))(
	[&](AddStateEventsAction a) {
	r.stateEvents = merge(std::move(r.stateEvents), a.stateEvents, keyOfState);

	// If m.room.encryption state event appears,
	// configure the room to use encryption.
	if (r.stateEvents.find(KeyOfState{"m.room.encryption", ""})) {
	auto newRoom = update(std::move(r), SetRoomEncryptionAction{});
	r = std::move(newRoom);
	}
	return r;
	},
	[&](MaybeAddStateEventsAction a) {
	for (auto it = a.stateEvents.rbegin();
	it != a.stateEvents.rend();
	++it) {
	const auto &e = *it;
	auto k = keyOfState(e);
	if (!r.stateEvents.count(k)) {
	r.stateEvents = std::move(r.stateEvents).set(k, e);
	}
	}
	return r;
	},
	[&](AddMessagesAction a) {
	r.messages = merge(std::move(r.messages), a.events, keyOfTimeline);
	if (!a.alsoInTimeline) {
	for (const auto &e : a.events) {
	r.nonTimelineEvents = std::move(r.nonTimelineEvents).insert(keyOfTimeline(e));
	}
	}

	auto handleRedaction =
	[&r](const auto &event) {
	if (event.type() == "m.room.redaction") {
	auto origJson = event.originalJson().get();
	if (origJson.contains("redacts") && origJson.at("redacts").is_string()) {
	auto redactedEventId = origJson.at("redacts").template get<std::string>();
	if (r.messages.find(redactedEventId)) {
	r.messages = std::move(r.messages).update(redactedEventId, [&origJson](const auto &eventToBeRedacted) {
	auto newJson = eventToBeRedacted.originalJson().get();
	newJson.merge_patch(json{
	{"unsigned", {{"redacted_because", std::move(origJson)}}},
	});
	newJson["content"] = json::object();
	return Event(newJson);
	});
	}
	}
	}
	return event;
	};

	immer::for_each(a.events, handleRedaction);

	// remove all local echoes that are received
	for (const auto &e : a.events) {
	auto jw = e.originalJson();
	const auto &json = jw.get();
	if (json.contains("unsigned")
	&& json["unsigned"].contains("transaction_id")
	&& json["unsigned"]["transaction_id"].is_string()) {
	r = update(std::move(r), RemoveLocalEchoAction{json["unsigned"]["transaction_id"].template get<std::string>()});
	}
	}

	// calculate event relationships
	r.generateRelationships(a.events);

	r.addToUndecryptedEvents(a.events);

	return r;
	},
	[&](AddToTimelineAction a) {
	auto eventIds = intoImmer(immer::flex_vector<std::string>(),
	zug::map(keyOfTimeline), a.events);

	auto oldMessages = r.messages;
	auto next = RoomModel::update(std::move(r), AddMessagesAction{a.events, /* alsoInTimeline = */ true});
	r = std::move(next);
	auto key =
	[=](auto eventId) {
	// sort first by timestamp, then by id
	return sortKeyForTimelineEvent(r.messages[eventId]);
	};

	// Things in messages do not always appear in the timeline.
	// Let `exists` function to always return false, so that it is checked for duplicates automatically.
	r.timeline = sortedUniqueMerge(r.timeline, eventIds, [](auto &&) { return false; }, key);

	for (const auto &e : eventIds) {
	r.nonTimelineEvents = std::move(r.nonTimelineEvents).erase(e);
	}

	// We have 3 possibilities for the source of calling this action:
	// pagination, sync, or load from storage.
	//
	// In pagination: `gapEventId.has_value() && !limited.has_value()`
	// If we can paginate back: `prevBatch.has_value()`
	//
	// In sync: `!gapEventId.has_value()`
	// If limited: `limited.has_value() && limited.value()`
	// If we can paginate back: `prevBatch.has_value()` (should always be present, but we do not add a Gap if it is not limited)
	//
	// In load from storage: `!gapEventId.has_value() && !limited.has_value() && !prevBatch.has_value()` (Because of actions/storage.cpp)

	// Only pagination and sync can add a Gap
	if (((a.limited.has_value() && a.limited.value())
	\|\| a.gapEventId.has_value())
	&& a.prevBatch.has_value()) {
	// this sync is limited, add a Gap here
	if (!eventIds.empty()) {
	r.timelineGaps = std::move(r.timelineGaps).set(eventIds[0], a.prevBatch.value());
	}
	}

	// Only pagination can remove Gaps
	// remove the original Gap, as it is resolved
	if (a.gapEventId.has_value()) {
	r.timelineGaps = std::move(r.timelineGaps).erase(a.gapEventId.value());
	}

	// remove all Gaps between the gapped event and the first event in this batch
	if (!eventIds.empty() && a.gapEventId.has_value()) {
	auto cmp = [=](auto a, auto b) {
	return key(a) < key(b);
	};
	auto thisBatchStart = std::equal_range(r.timeline.begin(), r.timeline.end(), eventIds[0], cmp).first;
	auto origBatchStart = std::equal_range(thisBatchStart, r.timeline.end(), a.gapEventId.value(), cmp).first;

	// Safety assert: we do not want to execute the for_each if the range is empty,
	// or it will go out of bounds.
	if (thisBatchStart.index() < origBatchStart.index()) {
	std::for_each(thisBatchStart + 1, origBatchStart,
	[&](auto eventId) {
	r.timelineGaps = std::move(r.timelineGaps).erase(eventId);
	});
	}
	}

	return r;
	},
	[&](AddAccountDataAction a) {
	r.accountData = merge(std::move(r.accountData), a.events, keyOfAccountData);
	return r;
	},
	[&](ChangeMembershipAction a) {
	r.membership = a.membership;
	return r;
	},
	[&](ChangeInviteStateAction a) {
	r.inviteState = merge(immer::map<KeyOfState, Event>{}, a.events, keyOfState);
	return r;
	},
	[&](AddEphemeralAction a) {
	auto processReceipt = [&](Event e) {
	const auto content = e.content().get();
	for (auto [eventId, receipts] : content.items()) {
	if (!receipts.is_object()) {
	continue;
	}
	for (auto receiptType : receiptTypes) {
	if (!(receipts.contains(receiptType)
	&& receipts[receiptType].is_object())) {
	continue;
	}

	for (auto [user, receipt]: receipts[receiptType].items()) {
	ReadReceipt readReceipt{
	eventId,
	0,
	};

	if (receipt.is_object() && receipt.contains("ts")
	&& receipt["ts"].is_number()) {
	readReceipt.timestamp = receipt["ts"].template get<Timestamp>();
	}

	// Remove old receipts
	if (r.readReceipts.count(user)) {
	auto oldReceiptEventId = r.readReceipts[user].eventId;
	if (r.eventReadUsers.count(oldReceiptEventId)) {
	auto remaining =
	intoImmer(
	immer::flex_vector<std::string>{},
	zug::filter([user=user](auto userId) {
	return userId != user;
	}),
	r.eventReadUsers[oldReceiptEventId]
	);

	if (remaining.empty()) {
	r.eventReadUsers = std::move(r.eventReadUsers).erase(oldReceiptEventId);
	} else {
	r.eventReadUsers = std::move(r.eventReadUsers).set(oldReceiptEventId, remaining);
	}
	}
	}

	// Add new receipt
	r.readReceipts = std::move(r.readReceipts).set(user, readReceipt);
	auto oldReadUsers = r.eventReadUsers[eventId];
	r.eventReadUsers = std::move(r.eventReadUsers).set(eventId, oldReadUsers.push_back(user));
	}
	}
	}
	};

	for (auto e : a.events) {
	if (e.type() == "m.receipt") {
	processReceipt(e);
	}
	}
	r.ephemeral = merge(std::move(r.ephemeral), a.events, keyOfEphemeral);
	return r;
	},
	[&](SetLocalDraftAction a) {
	r.localDraft = a.localDraft;
	return r;
	},
	[&](SetRoomEncryptionAction) {
	r.encrypted = true;
	return r;
	},
	[&](MarkMembersFullyLoadedAction) {
	r.membersFullyLoaded = true;
	return r;
	},
	[&](SetHeroIdsAction a) {
	r.heroIds = a.heroIds;
	return r;
	},
	[&](AddLocalEchoAction a) {
	auto it = std::find_if(r.localEchoes.begin(), r.localEchoes.end(), [a](const auto &desc) {
	return desc.txnId == a.localEcho.txnId;
	});
	if (it == r.localEchoes.end()) {
	r.localEchoes = std::move(r.localEchoes).push_back(a.localEcho);
	} else {
	r.localEchoes = std::move(r.localEchoes).set(it.index(), a.localEcho);
	}
	return r;
	},
	[&](RemoveLocalEchoAction a) {
	auto it = std::find_if(r.localEchoes.begin(), r.localEchoes.end(), [a](const auto &desc) {
	return desc.txnId == a.txnId;
	});
	if (it != r.localEchoes.end()) {
	r.localEchoes = std::move(r.localEchoes).erase(it.index());
	}
	return r;
	},
	[&](AddPendingRoomKeyAction a) {
	auto it = std::find_if(r.pendingRoomKeyEvents.begin(), r.pendingRoomKeyEvents.end(), [a](const auto &p) {
	return p.txnId == a.pendingRoomKeyEvent.txnId;
	});
	if (it == r.pendingRoomKeyEvents.end()) {
	r.pendingRoomKeyEvents = std::move(r.pendingRoomKeyEvents).push_back(a.pendingRoomKeyEvent);
	} else {
	r.pendingRoomKeyEvents = std::move(r.pendingRoomKeyEvents).set(it.index(), a.pendingRoomKeyEvent);
	}
	return r;
	},
	[&](RemovePendingRoomKeyAction a) {
	auto it = std::find_if(r.pendingRoomKeyEvents.begin(), r.pendingRoomKeyEvents.end(), [a](const auto &desc) {
	return desc.txnId == a.txnId;
	});
	if (it != r.pendingRoomKeyEvents.end()) {
	r.pendingRoomKeyEvents = std::move(r.pendingRoomKeyEvents).erase(it.index());
	}
	return r;
	},
	[&](UpdateJoinedMemberCountAction a) {
	r.joinedMemberCount = a.joinedMemberCount;
	return r;
	},
	[&](UpdateInvitedMemberCountAction a) {
	r.invitedMemberCount = a.invitedMemberCount;
	return r;
	},
	[&](AddLocalNotificationsAction a) {
	auto k = [r](const auto &id) {
	return sortKeyForTimelineEvent(r.messages[id]);
	};

	auto readReceiptForCurrentUser = getMaxInTimeline(r.readReceipts[a.myUserId].eventId, r.localReadMarker, k);

	auto newEventIds = intoImmer(
	immer::flex_vector<std::string>{},
	zug::map(&Event::id),
	a.newEvents
	);

	auto needToAddPredicate = [a, r, k, readReceiptForCurrentUser](const auto &eid) {
	if (!readReceiptForCurrentUser.empty()
	&& k(readReceiptForCurrentUser) >= k(eid)) {
	// this means this event is already read
	return false;
	}
	auto e = r.messages[eid];
	return e.sender() != a.myUserId
	&& a.pushRulesDesc.handle(e, r).shouldNotify;
	};

	r.unreadNotificationEventIds = sortedUniqueMerge(std::move(r.unreadNotificationEventIds), newEventIds, [needToAddPredicate](const auto &e) { return !needToAddPredicate(e); }, k);
	return r;
	},
	[&](RemoveReadLocalNotificationsAction a) {
	auto k = [r](const auto &id) {
	return sortKeyForTimelineEvent(r.messages[id]);
	};
	auto cmp = [k](const auto &a, const auto &b) {
	return k(a) < k(b);
	};

	auto rr = getMaxInTimeline(
	r.readReceipts[a.myUserId].eventId,
	r.localReadMarker,
	k
	);
	if (rr.empty()) {
	return r;
	}

	auto it = std::upper_bound(
	r.unreadNotificationEventIds.begin(),
	r.unreadNotificationEventIds.end(),
	rr,
	cmp
	);
	// it > rr, (it - 1) <= rr (if it - 1 is valid)
	if (it == r.unreadNotificationEventIds.end()) {
	// If it == end(), it means everything is read
	r.unreadNotificationEventIds = {};
	} else if (it == r.unreadNotificationEventIds.begin()) {
	// If it == begin(), it means everything is unread, so nothing to do
	} else {
	// it is somewhere in the middle, pointing to the first element that is unread
	r.unreadNotificationEventIds = std::move(r.unreadNotificationEventIds).erase(0, it.index());
	}
	return r;
	},
	[&](UpdateLocalReadMarkerAction a) {
	r.localReadMarker = a.localReadMarker;
	auto next = RoomModel::update(std::move(r), RemoveReadLocalNotificationsAction{a.myUserId});
	return next;
	},
	[&](PurgeEventsAction a) {
	if (r.timeline.size() <= a.maxToKeep) {
	return r;
	}
	auto numToDrop = r.timeline.size() - a.maxToKeep;
	auto keepEvents = intoImmer(
	EventList{},
	zug::map([&r](const auto &eventId) {
	return r.messages[eventId];
	}),
	std::move(r.timeline).drop(numToDrop)
	);
	auto origMessages = r.messages;
	r.reverseEventRelationships = {};
	r.timeline = {};
	r.messages = {};
	r.undecryptedEvents = {};

	auto msgs = intoImmer(
	r.localReadMarker.empty() ? EventList{} : EventList{origMessages[r.localReadMarker]},
	zug::filter([l=r.localReadMarker](const auto &eventId) {
	return eventId != l;
	})
	\| zug::map([&origMessages](const auto &eventId) {
	return origMessages[eventId];
	}),
	r.unreadNotificationEventIds
	);

	auto next = update(std::move(r), AddMessagesAction{msgs});

	return update(std::move(next), AddToTimelineAction{
	keepEvents,
	std::nullopt,
	std::nullopt,
	std::nullopt,
	});
	}
	);
	}

	RoomListModel RoomListModel::update(RoomListModel l, Action a)
	{
	return lager::match(std::move(a))(
	[&](UpdateRoomAction a) {
	l.rooms = std::move(l.rooms)
	.update(a.roomId,
	[=](RoomModel oldRoom) {
	oldRoom.roomId = a.roomId; // in case it is a new room
	return RoomModel::update(std::move(oldRoom), a.roomAction);
	});
	return l;
	}
	);
	}

	static auto membershipTransducer(const std::string &membership)
	{
	return zug::filter([](auto val) {
	auto [k, v] = val;
	auto [type, stateKey] = k;
	return type == "m.room.member"s;
	})
	\| zug::map([](auto val) {
	auto [k, v] = val;
	auto [type, stateKey] = k;
	return std::pair<std::string, Kazv::Event>{stateKey, v};
	})
	\| zug::filter([&membership](auto val) {
	auto [stateKey, ev] = val;
	return ev.content().get()
	.at("membership"s) == membership;
	});
	}

	static auto memberIdsByMembership(immer::map<KeyOfState, Event> stateEvents, const std::string &membership)
	{
	return intoImmer(
	immer::flex_vector<std::string>{},
	membershipTransducer(membership)
	\| zug::map([](auto val) {
	auto [stateKey, ev] = val;
	return stateKey;
	}),
	stateEvents);
	}

	auto memberEventsByMembership(immer::map<KeyOfState, Event> stateEvents, const std::string &membership)
	{
	return intoImmer(
	EventList{},
	membershipTransducer(membership)
	\| zug::map([](auto val) {
	auto [stateKey, ev] = val;
	return ev;
	}),
	stateEvents);
	}

	immer::flex_vector<std::string> RoomModel::joinedMemberIds() const
	{
	return memberIdsByMembership(stateEvents, "join"s);
	}

	immer::flex_vector<std::string> RoomModel::invitedMemberIds() const
	{
	return memberIdsByMembership(stateEvents, "invite"s);
	}

	immer::flex_vector<std::string> RoomModel::knockedMemberIds() const
	{
	return memberIdsByMembership(stateEvents, "knock"s);
	}

	immer::flex_vector<std::string> RoomModel::leftMemberIds() const
	{
	return memberIdsByMembership(stateEvents, "leave"s);
	}

	immer::flex_vector<std::string> RoomModel::bannedMemberIds() const
	{
	return memberIdsByMembership(stateEvents, "ban"s);
	}

	EventList RoomModel::joinedMemberEvents() const
	{
	return memberEventsByMembership(stateEvents, "join"s);
	}

	EventList RoomModel::invitedMemberEvents() const
	{
	return memberEventsByMembership(stateEvents, "invite"s);
	}

	EventList RoomModel::knockedMemberEvents() const
	{
	return memberEventsByMembership(stateEvents, "knock"s);
	}

	EventList RoomModel::leftMemberEvents() const
	{
	return memberEventsByMembership(stateEvents, "leave"s);
	}

	EventList RoomModel::bannedMemberEvents() const
	{
	return memberEventsByMembership(stateEvents, "ban"s);
	}

	EventList RoomModel::heroMemberEvents() const
	{
	return intoImmer(
	EventList{},
	zug::filter([heroIds=heroIds](auto val) {
	auto [k, ev] = val;
	auto [type, stateKey] = k;
	return type == "m.room.member"s &&
	std::find(heroIds.begin(), heroIds.end(), stateKey) != heroIds.end();
	})
	\| zug::map([](auto val) {
	auto [_, ev] = val;
	return ev;
	}),
	stateEvents);
	}

	static Timestamp defaultRotateMs = 604800000;
	static int defaultRotateMsgs = 100;

	MegOlmSessionRotateDesc RoomModel::sessionRotateDesc() const
	{
	auto k = KeyOfState{"m.room.encryption", ""};
	auto content = stateEvents[k].content().get();
	auto ms = content.contains("rotation_period_ms")
	? content["rotation_period_ms"].get<Timestamp>()
	: defaultRotateMs;
	auto msgs = content.contains("rotation_period_msgs")
	? content["rotation_period_msgs"].get<int>()
	: defaultRotateMsgs;
	return MegOlmSessionRotateDesc{ ms, msgs };
	}

	bool RoomModel::hasUser(std::string userId) const
	{
	try {
	auto ev = stateEvents.at(KeyOfState{"m.room.member", userId});
	if (ev.content().get().at("membership") == "join") {
	return true;
	}
	} catch (const std::exception &) {
	return false;
	}
	return false;
	}

	std::optional<LocalEchoDesc> RoomModel::getLocalEchoByTxnId(std::string txnId) const
	{
	auto it = std::find_if(localEchoes.begin(), localEchoes.end(), [txnId](const auto &desc) {
	return txnId == desc.txnId;
	});
	if (it != localEchoes.end()) {
	return *it;
	} else {
	return std::nullopt;
	}
	}

	std::optional<PendingRoomKeyEvent> RoomModel::getPendingRoomKeyEventByTxnId(std::string txnId) const
	{
	auto it = std::find_if(pendingRoomKeyEvents.begin(), pendingRoomKeyEvents.end(), [txnId](const auto &desc) {
	return txnId == desc.txnId;
	});
	if (it != pendingRoomKeyEvents.end()) {
	return *it;
	} else {
	return std::nullopt;
	}
	}

	static double getTagOrder(const json &tag)
	{
	// https://spec.matrix.org/v1.7/client-server-api/#events-12
	// If a room has a tag without an order key then it should appear after the rooms with that tag that have an order key.
	return tag.contains("order") && tag["order"].is_number()
	? tag["order"].template get<double>()
	: ROOM_TAG_DEFAULT_ORDER;
	}

	immer::map<std::string, double> RoomModel::tags() const
	{
	auto content = accountData["m.tag"].content().get();
	if (!content.contains("tags") \|\| !content["tags"].is_object()) {
	return {};
	}

	auto tagsObject = content["tags"];
	auto tagsItems = tagsObject.items();
	return std::accumulate(tagsItems.begin(), tagsItems.end(), immer::map<std::string, double>(),
	[=](auto acc, const auto &cur) {
	auto [id, tag] = cur;
	return std::move(acc).set(id, getTagOrder(tag));
	}
	);
	}

	static auto normalizeTagEventJson(Event e)
	{
	auto content = e.content().get();
	if (!content.contains("tags") \|\| !content["tags"].is_object()) {
	content["tags"] = json::object();
	}
	return json{
	{"content", content},
	{"type", "m.tag"},
	};
	}

	Event RoomModel::makeAddTagEvent(std::string tagId, std::optional<double> order) const
	{
	auto eventJson = normalizeTagEventJson(accountData["m.tag"]);
	auto tag = json::object();
	if (order.has_value()) {
	tag["order"] = order.value();
	}

	eventJson["content"]["tags"][tagId] = tag;
	return Event(eventJson);
	}

	Event RoomModel::makeRemoveTagEvent(std::string tagId) const
	{
	auto eventJson = normalizeTagEventJson(accountData["m.tag"]);
	eventJson["content"]["tags"].erase(tagId);
	return Event(eventJson);
	}

	void RoomModel::generateRelationships(EventList newEvents)
	{
	for (const auto &event: newEvents) {
	auto [relType, eventId] = event.relationship();
	if (!relType.empty()) {
	reverseEventRelationships = updateIn(std::move(reverseEventRelationships), [event](auto &&evs) {
	return evs.push_back(event.id());
	}, eventId, relType);
	}
	}
	}

	void RoomModel::regenerateRelationships()
	{
	generateRelationships(intoImmer(EventList{}, zug::map([](const auto &kv) {
	return kv.second;
	}), messages));
	}

	void RoomModel::addToUndecryptedEvents(EventList newEvents)
	{
	if (!encrypted) {
	return;
	}

	for (auto event : newEvents) {
	if (event.encrypted() && !event.decrypted()) {
	auto original = event.originalJson();
	const auto &o = original.get();
	if (o.contains("content")
	&& o["content"].contains("session_id")
	&& o["content"]["session_id"].is_string()
	) {
	auto sessionId = o["content"]["session_id"].template get<std::string>();
	undecryptedEvents = std::move(undecryptedEvents)
	.update(sessionId, [id=event.id()](const auto &v) {
	return v.push_back(id);
	});
	}
	}
	}
	}

	void RoomModel::recalculateUndecryptedEvents()
	{
	if (!encrypted) {
	return;
	}

	addToUndecryptedEvents(intoImmer(EventList{}, zug::map([](const auto &kv) {
	return kv.second;
	}), messages));
	}

	bool RoomModel::checkInvariants() const
	{
	auto inMessages = [this](const std::string &eventId) {
	return !!messages.count(eventId);
	};
	return immer::all_of(timeline, inMessages)
	&& immer::all_of(unreadNotificationEventIds, inMessages)
	&& std::all_of(undecryptedEvents.begin(), undecryptedEvents.end(), [&inMessages](const auto &p) {
	return immer::all_of(p.second, inMessages);
	})
	&& (localReadMarker.empty() \|\| messages.count(localReadMarker))
	&& std::all_of(reverseEventRelationships.begin(), reverseEventRelationships.end(), [&inMessages](const auto &p) {
	const auto &relTypeToEventsMap = p.second;
	return std::all_of(relTypeToEventsMap.begin(), relTypeToEventsMap.end(), [&inMessages](const auto &p2) {
	const auto &events = p2.second;
	return immer::all_of(events, inMessages);
	});
	});
	}

	bool RoomModel::isInTimeline(const std::string &eventId) const
	{
	return !nonTimelineEvents.count(eventId) && messages.count(eventId);
	}
	+
	+ bool RoomModel::isReadBy(const std::string &eventId, const std::string &userId) const
	+ {
	+ auto readReceiptAt = messages[readReceipts[userId].eventId];
	+ auto event = messages[eventId];
	+ return sortKeyForTimelineEvent(readReceiptAt) >= sortKeyForTimelineEvent(event);
	+ }
	}
	diff --git a/src/client/room/room-model.hpp b/src/client/room/room-model.hpp
	index b9b0c2f..8e14717 100644
	--- a/src/client/room/room-model.hpp
	+++ b/src/client/room/room-model.hpp
	@@ -1,506 +1,516 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2021-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/


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

	#include <string>
	#include <variant>
	#include <immer/flex_vector.hpp>
	#include <immer/map.hpp>
	#include <immer/set.hpp>

	#include <serialization/immer-flex-vector.hpp>
	#include <serialization/immer-box.hpp>
	#include <serialization/immer-map.hpp>
	#include <serialization/immer-set.hpp>
	#include <serialization/immer-array.hpp>

	#include <csapi/sync.hpp>
	#include <event.hpp>

	#include <crypto.hpp>
	#include "push-rules-desc.hpp"
	#include "local-echo.hpp"
	#include "clientutil.hpp"

	namespace Kazv
	{
	struct PendingRoomKeyEvent
	{
	std::string txnId;
	immer::map<std::string, immer::map<std::string, Event>> messages;

	friend bool operator==(const PendingRoomKeyEvent &a, const PendingRoomKeyEvent &b) = default;
	friend bool operator!=(const PendingRoomKeyEvent &a, const PendingRoomKeyEvent &b) = default;
	};

	PendingRoomKeyEvent makePendingRoomKeyEventV0(std::string txnId, Event event, immer::map<std::string, immer::flex_vector<std::string>> devices);

	struct ReadReceipt
	{
	std::string eventId;
	Timestamp timestamp;
	friend bool operator==(const ReadReceipt &a, const ReadReceipt &b) = default;
	friend bool operator!=(const ReadReceipt &a, const ReadReceipt &b) = default;
	};

	template<class Archive>
	void serialize(Archive &ar, ReadReceipt &r, std::uint32_t const /* version */)
	{
	ar & r.eventId & r.timestamp;
	}


	struct EventReader
	{
	std::string userId;
	Timestamp timestamp;
	friend bool operator==(const EventReader &a, const EventReader &b) = default;
	friend bool operator!=(const EventReader &a, const EventReader &b) = default;
	};

	struct AddStateEventsAction
	{
	immer::flex_vector<Event> stateEvents;
	};

	/// Go from the back of stateEvents to the beginning,
	/// adding the event to room state only if the room
	/// has no state event with that state key.
	struct MaybeAddStateEventsAction
	{
	immer::flex_vector<Event> stateEvents;
	};

	/// Add events to the messages map, but not the timeline.
	/// Usually because their position in the timeline is not known.
	struct AddMessagesAction
	{
	EventList events;
	/// @internal only to be used by AddToTimelineAction
	bool alsoInTimeline{false};
	};

	struct AddToTimelineAction
	{
	/// Events from oldest to latest
	immer::flex_vector<Event> events;
	std::optional<std::string> prevBatch;
	std::optional<bool> limited;
	std::optional<std::string> gapEventId;
	};

	struct AddAccountDataAction
	{
	immer::flex_vector<Event> events;
	};

	struct ChangeMembershipAction
	{
	RoomMembership membership;
	};

	struct ChangeInviteStateAction
	{
	immer::flex_vector<Event> events;
	};

	struct AddEphemeralAction
	{
	EventList events;
	};

	struct SetLocalDraftAction
	{
	std::string localDraft;
	};

	struct SetRoomEncryptionAction
	{
	};

	struct MarkMembersFullyLoadedAction
	{
	};

	struct SetHeroIdsAction
	{
	immer::flex_vector<std::string> heroIds;
	};

	struct AddLocalEchoAction
	{
	LocalEchoDesc localEcho;
	};

	struct RemoveLocalEchoAction
	{
	std::string txnId;
	};

	struct AddPendingRoomKeyAction
	{
	PendingRoomKeyEvent pendingRoomKeyEvent;
	};

	struct RemovePendingRoomKeyAction
	{
	std::string txnId;
	};

	struct UpdateJoinedMemberCountAction
	{
	std::size_t joinedMemberCount;
	};

	struct UpdateInvitedMemberCountAction
	{
	std::size_t invitedMemberCount;
	};

	/// Update local notifications to include the new events
	///
	/// Precondition: newEvents are already in room.messages
	struct AddLocalNotificationsAction
	{
	EventList newEvents;
	PushRulesDesc pushRulesDesc;
	std::string myUserId;
	};

	/// Remove local notifications that are already read
	struct RemoveReadLocalNotificationsAction
	{
	std::string myUserId;
	};

	/// Update the local read marker, removing any read notifications before it.
	struct UpdateLocalReadMarkerAction
	{
	std::string localReadMarker;
	std::string myUserId;
	};

	/// Remove events from the model, retaining only the latest `maxToKeep` events.
	struct PurgeEventsAction
	{
	std::size_t maxToKeep;
	};

	inline const double ROOM_TAG_DEFAULT_ORDER = 2;

	template<class Archive>
	void serialize(Archive &ar, PendingRoomKeyEvent &e, std::uint32_t const version)
	{
	if (version < 1) {
	// loading an older version where there is only one event
	std::string txnId;
	Event event;
	immer::map<std::string, immer::flex_vector<std::string>> devices;
	ar & txnId & event & devices;
	e = makePendingRoomKeyEventV0(
	std::move(txnId), std::move(event), std::move(devices));
	} else {
	ar & e.txnId & e.messages;
	}
	}

	/**
	* Get the sort key for a timeline event.
	*
	* If the key is larger, the event should be placed
	* at the more recent end of the timeline.
	*
	* @param e The event to get the sort key for.
	* @return The sort key. You MUST use `auto` to store the
	* result.
	*/
	auto sortKeyForTimelineEvent(Event e) -> std::tuple<Timestamp, std::string>;

	/**
	* The model to store information about a room.
	*
	* Room invariants:
	* Any event in timeline is in messages.
	* Any event in undecryptedEvents is in messages.
	* Any event in unreadNotificationEventIds is in messages.
	* Any relater (i.e. child) event in reverseEventRelationships is in messages.
	* localReadMarker (if not empty) is in messages.
	*/
	struct RoomModel
	{
	using Membership = RoomMembership;
	using ReverseEventRelationshipMap = immer::map<
	std::string /* related event id */,
	immer::map<std::string /* relation type /, immer::flex_vector<std::string / relater event id */>>>;

	std::string roomId;
	immer::map<KeyOfState, Event> stateEvents;
	immer::map<KeyOfState, Event> inviteState;
	// Smaller indices mean earlier events
	// (oldest) 0 --------> n (latest)
	immer::flex_vector<std::string> timeline;
	immer::map<std::string, Event> messages;
	immer::map<std::string, Event> accountData;
	Membership membership{};
	std::string paginateBackToken;
	/// whether this room has earlier events to be fetched
	bool canPaginateBack{true};

	immer::map<std::string /* eventId /, std::string / prevBatch */> timelineGaps;

	immer::map<std::string, Event> ephemeral;

	std::string localDraft;

	bool encrypted{false};
	/// a marker to indicate whether we need to rotate
	/// the session key earlier than it expires
	/// (e.g. when a user in the room's device list changed
	/// or when someone joins or leaves)
	bool shouldRotateSessionKey{true};

	bool membersFullyLoaded{false};
	immer::flex_vector<std::string> heroIds;

	immer::flex_vector<LocalEchoDesc> localEchoes;

	immer::flex_vector<PendingRoomKeyEvent> pendingRoomKeyEvents;

	ReverseEventRelationshipMap reverseEventRelationships;

	std::size_t joinedMemberCount{0};
	std::size_t invitedMemberCount{0};

	/// The local read marker for this room. Indicates that
	/// you have read up to this event.
	std::string localReadMarker;
	/// The local unread count for this room.
	std::size_t localUnreadCount{0};
	/// The local unread notification count for this room.
	/// XXX this is never used.
	std::size_t localNotificationCount{0};
	/// Read receipts for all users
	immer::map<std::string /* userId */, ReadReceipt> readReceipts;
	/// A map from event id to a list of users that has read
	/// receipt at that point
	immer::map<
	std::string /* eventId */,
	immer::flex_vector<std::string /* userId */>> eventReadUsers;

	/// A map from the session id to a list of event ids of events
	/// that cannot (yet) be decrypted.
	immer::map<
	std::string /* sessionId */,
	immer::flex_vector<std::string /* eventId */>> undecryptedEvents;

	immer::flex_vector<std::string> unreadNotificationEventIds;
	/// The set of event ids that are in `messages` but not in `timeline`.
	/// The rationale is that non-timeline events are sparse, so
	/// instead of recording events that are in the timeline, we
	/// record those not in the timeline.
	immer::set<std::string> nonTimelineEvents;

	immer::flex_vector<std::string> joinedMemberIds() const;
	immer::flex_vector<std::string> invitedMemberIds() const;
	immer::flex_vector<std::string> knockedMemberIds() const;
	immer::flex_vector<std::string> leftMemberIds() const;
	immer::flex_vector<std::string> bannedMemberIds() const;

	EventList joinedMemberEvents() const;
	EventList invitedMemberEvents() const;
	EventList knockedMemberEvents() const;
	EventList leftMemberEvents() const;
	EventList bannedMemberEvents() const;
	EventList heroMemberEvents() const;

	MegOlmSessionRotateDesc sessionRotateDesc() const;

	bool hasUser(std::string userId) const;

	std::optional<LocalEchoDesc> getLocalEchoByTxnId(std::string txnId) const;
	std::optional<PendingRoomKeyEvent> getPendingRoomKeyEventByTxnId(std::string txnId) const;

	immer::map<std::string, double> tags() const;

	Event makeAddTagEvent(std::string tagId, std::optional<double> order) const;
	Event makeRemoveTagEvent(std::string tagId) const;

	/**
	* Fill in reverseEventRelationships by gathering
	* the relationships specified in `newEvents`
	*
	* @param newEvents The events that just came in after last time event relationships
	* are gathered.
	*/
	void generateRelationships(EventList newEvents);

	void regenerateRelationships();

	/**
	* Fill in undecryptedEvents by gathering
	* the session ids specified in `newEvents`.
	*
	* @param newEvents New incoming events.
	*/
	void addToUndecryptedEvents(EventList newEvents);

	void recalculateUndecryptedEvents();

	/**
	* Check if the invariants in the model are satisfied.
	* @return true iff the invariants are satisfied.
	*/
	bool checkInvariants() const;

	/**
	* Check if the event is in the timeline.
	*
	* This function takes constant time.
	* @param eventId The id of the event to check.
	* @return true iff the event is in the timeline.
	*/
	bool isInTimeline(const std::string &eventId) const;

	+
	+ /**
	+ * Check if an event has been read by the given user
	+ *
	+ * @param eventId eventId of the event to check
	+ * @param userId userId of the given user
	+ * @return true iff the event is read by the user
	+ */
	+ bool isReadBy(const std::string &eventId, const std::string &userId) const;
	+
	using Action = std::variant<
	AddStateEventsAction,
	MaybeAddStateEventsAction,
	AddMessagesAction,
	AddToTimelineAction,
	AddAccountDataAction,
	ChangeMembershipAction,
	ChangeInviteStateAction,
	AddEphemeralAction,
	SetLocalDraftAction,
	SetRoomEncryptionAction,
	MarkMembersFullyLoadedAction,
	SetHeroIdsAction,
	AddLocalEchoAction,
	RemoveLocalEchoAction,
	AddPendingRoomKeyAction,
	RemovePendingRoomKeyAction,
	UpdateJoinedMemberCountAction,
	UpdateInvitedMemberCountAction,
	AddLocalNotificationsAction,
	RemoveReadLocalNotificationsAction,
	UpdateLocalReadMarkerAction,
	PurgeEventsAction
	>;

	static RoomModel update(RoomModel r, Action a);

	friend bool operator==(const RoomModel &a, const RoomModel &b) = default;
	};

	using RoomAction = RoomModel::Action;

	struct UpdateRoomAction
	{
	std::string roomId;
	RoomAction roomAction;
	};

	struct RoomListModel
	{
	immer::map<std::string, RoomModel> rooms;

	inline auto at(std::string id) const { return rooms.at(id); }
	inline auto operator[](std::string id) const { return rooms[id]; }
	inline bool has(std::string id) const { return rooms.find(id); }

	using Action = std::variant<
	UpdateRoomAction
	>;
	static RoomListModel update(RoomListModel l, Action a);

	friend bool operator==(const RoomListModel &a, const RoomListModel &b) = default;
	};

	using RoomListAction = RoomListModel::Action;

	template<class Archive>
	void serialize(Archive &ar, RoomModel &r, std::uint32_t const version)
	{
	ar
	& r.roomId
	& r.stateEvents
	& r.inviteState

	& r.timeline
	& r.messages
	& r.accountData
	& r.membership
	& r.paginateBackToken
	& r.canPaginateBack

	& r.timelineGaps
	& r.ephemeral

	& r.localDraft

	& r.encrypted
	& r.shouldRotateSessionKey

	& r.membersFullyLoaded
	;

	if (version >= 1) {
	ar
	& r.heroIds
	;
	}
	if (version >= 2) {
	ar & r.localEchoes;
	}
	if (version >= 3) {
	ar & r.pendingRoomKeyEvents;
	}
	if (version >= 4) {
	ar & r.reverseEventRelationships;
	} else { // must be reading from an older version
	if constexpr (typename Archive::is_loading()) {
	r.regenerateRelationships();
	}
	}
	if (version >= 5) {
	ar & r.joinedMemberCount & r.invitedMemberCount;
	}
	if (version >= 6) {
	ar
	& r.localReadMarker
	& r.localUnreadCount
	& r.localNotificationCount
	& r.readReceipts
	& r.eventReadUsers;
	}
	if (version >= 7) {
	ar & r.undecryptedEvents;
	} else {
	if constexpr (typename Archive::is_loading()) {
	r.recalculateUndecryptedEvents();
	}
	}
	if (version >= 8) {
	ar & r.unreadNotificationEventIds;
	}
	if (version >= 9) {
	ar & r.nonTimelineEvents;
	}
	}

	template<class Archive>
	void serialize(Archive &ar, RoomListModel &l, std::uint32_t const /version/)
	{
	ar & l.rooms;
	}
	}

	BOOST_CLASS_VERSION(Kazv::PendingRoomKeyEvent, 1)
	BOOST_CLASS_VERSION(Kazv::ReadReceipt, 0)
	BOOST_CLASS_VERSION(Kazv::RoomModel, 9)
	BOOST_CLASS_VERSION(Kazv::RoomListModel, 0)
	diff --git a/src/client/room/room.cpp b/src/client/room/room.cpp
	index 2aef687..ef2d02d 100644
	--- a/src/client/room/room.cpp
	+++ b/src/client/room/room.cpp
	@@ -1,947 +1,952 @@
	/*
	* 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 <zug/into_vector.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::localEcho(lager::reader<std::string> txnId) const -> lager::reader<LocalEchoDesc>
	{
	return lager::with(roomCursor()[&RoomModel::localEchoes], txnId)
	.map([](const auto localEchoes, const auto &id) {
	auto localEchoIt = std::find_if(
	localEchoes.begin(), localEchoes.end(),
	[id](const auto localEcho) {
	return localEcho.txnId == id;
	});
	if (localEchoIt == localEchoes.end()) {
	return LocalEchoDesc {};
	}
	return *localEchoIt;
	});
	}

	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;
	return roomCursor().map(&RoomModel::heroMemberEvents);
	}

	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::localReadMarker() const
	-> lager::reader<std::string>
	{
	return roomCursor()[&RoomModel::localReadMarker];
	}

	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>(PrepareForSharingRoomKeyAction::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();
	return ctx.dispatch(SendMultipleToDeviceMessagesAction{pending.messages})
	.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::pinnedEvents() const -> lager::reader<immer::flex_vector<std::string>>
	{
	return state(KeyOfState{"m.room.pinned_events", ""})
	.xform(eventContent \| jsonAtOr("pinned", immer::flex_vector<std::string>{}));
	}

	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::pinEvents(immer::flex_vector<std::string> eventIds) const -> PromiseT
	{
	return m_ctx.createResolvedPromise({})
	.then([room=toEventLoop(), eventIds](auto) {
	auto curPinnedEvents = room.pinnedEvents().get();
	auto newPinnedEvents = intoImmer(
	curPinnedEvents,
	zug::filter([curPinnedEvents](const auto &eventId) {
	return std::find(curPinnedEvents.begin(), curPinnedEvents.end(), eventId) == curPinnedEvents.end();
	}),
	eventIds
	);
	return room.setPinnedEvents(newPinnedEvents);
	});
	}

	auto Room::unpinEvents(immer::flex_vector<std::string> eventIds) const -> PromiseT
	{
	return m_ctx.createResolvedPromise({})
	.then([room=toEventLoop(), eventIds](auto) {
	auto curPinnedEvents = room.pinnedEvents().get();
	auto newPinnedEvents = intoImmer(
	immer::flex_vector<std::string>(),
	zug::filter([eventIds](const auto &eventId) {
	return std::find(eventIds.begin(), eventIds.end(), eventId) == eventIds.end();
	}),
	curPinnedEvents
	);
	return room.setPinnedEvents(newPinnedEvents);
	});
	}

	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::removeLocalEcho(std::string txnId) const -> PromiseT
	{
	return m_ctx.dispatch(RoomListAction{UpdateRoomAction{
	currentRoomId(),
	RemoveLocalEchoAction{txnId},
	}});
	}

	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);
	});
	}

	auto Room::relatedEvents(lager::reader<std::string> eventId, std::string relType) const -> lager::reader<EventList>
	{
	return lager::with(
	eventId,
	roomCursor()[&RoomModel::reverseEventRelationships],
	roomCursor()[&RoomModel::messages]
	).map([relType](const auto &eid, const auto &rels, const auto &msgs) {
	auto relatedEvents = zug::into_vector(
	zug::map([msgs](const auto &id) {
	return msgs[id];
	}),
	rels[eid][relType]
	);
	std::sort(relatedEvents.begin(), relatedEvents.end(), [](const Event &a, const Event &b) {
	return std::make_tuple(a.originServerTs(), a.id()) < std::make_tuple(b.originServerTs(), b.id());
	});

	return EventList(relatedEvents.begin(), relatedEvents.end());
	}).make();
	}

	auto Room::eventReaders(lager::reader<std::string> eventId) const -> lager::reader<immer::flex_vector<EventReader>>
	{
	return lager::with(
	roomCursor()[&RoomModel::readReceipts],
	roomCursor()[&RoomModel::eventReadUsers],
	eventId
	).map([](const auto &receipts, const auto &readUsers, const auto &eid) {
	auto userIds = readUsers[eid];
	return intoImmer(
	immer::flex_vector<EventReader>{},
	zug::map([receipts](const auto &userId) {
	return EventReader{userId, receipts[userId].timestamp};
	}),
	userIds
	);
	});
	}

	auto Room::postReceipt(std::string eventId) const -> PromiseT
	{
	return m_ctx.dispatch(PostReceiptAction{roomId().make().get(), eventId});
	}

	auto Room::unreadNotificationEventIds() const -> lager::reader<immer::flex_vector<std::string>>
	{
	return m_roomCursor[&RoomModel::unreadNotificationEventIds];
	}
	+
	+ bool Room::isReadBy(const std::string &eventId, const std::string &userId)
	+ {
	+ return m_roomCursor.get().isReadBy(eventId, userId);
	+ }
	}
	diff --git a/src/client/room/room.hpp b/src/client/room/room.hpp
	index b7fd521..d6bd3b7 100644
	--- a/src/client/room/room.hpp
	+++ b/src/client/room/room.hpp
	@@ -1,834 +1,843 @@
	/*
	* 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];
	}

	/**
	* 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 one local echo by the txnId.
	*
	* @param A lager::reader of the txnId.
	*
	* @return A lager::reader of the local echo.
	*/
	auto localEcho(lager::reader<std::string> txnId) const -> lager::reader<LocalEchoDesc>;

	/**
	* 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 local read marker in this room.
	*
	* @return a lager::reader of a std::string of the local read marker.
	*/
	auto localReadMarker() const -> lager::reader<std::string>;

	/**
	* 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);
	}

	/**
	* Get pinned events of this room
	*
	* @return A lager::reader of RangeT of the pinned event ids.
	*/
	auto pinnedEvents() const -> lager::reader<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;

	/**
	* Add eventIds to the pinned events of this room
	*
	* @param eventIds The ids of events you want to add to the 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 pinEvents(immer::flex_vector<std::string> eventIds) const;

	/**
	* Remove eventIds from the pinned events of this room
	*
	* @param eventIds The ids of events you want to remove from the 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 unpinEvents(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>>;

	/**
	* Remove a local echo from this room.
	*
	* @param txnId The transaction id associated with that local echo.
	*
	* @return A Promise that resolves when the local echo is removed.
	*/
	PromiseT removeLocalEcho(std::string txnId) const;

	/**
	* 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>;

	/**
	* Get a list of child events of a specified event.
	*
	* @param eventId The id of the event.
	* @param relType The type of the relationship.
	* @return A lager::reader of a RangeT of events that are related to the event via `relType`. It is sorted in the same order as the timeline.
	*/
	auto relatedEvents(lager::reader<std::string> eventId, std::string relType) const -> lager::reader<EventList>;

	/**
	* Get a list of read receipts of some event in this room.
	*
	* @param eventId The id of the event.
	* @return A lager::reader of a RangeT of matrix id and timestamp of receipts of the event.
	*/
	auto eventReaders(lager::reader<std::string> eventId) const -> lager::reader<immer::flex_vector<EventReader>>;

	/**
	* Post a read receipt for this room.
	*
	* @param eventId The event id the user has read up to.
	*
	* @return A Promise that resolves when the read receipt is sent.
	*/
	PromiseT postReceipt(std::string eventId) const;

	/**
	* Get a list of event ids of unread notifications.
	*
	* @return A lager::reader of a RangeT of event ids that
	* has an unread notification.
	*/
	auto unreadNotificationEventIds() const -> lager::reader<immer::flex_vector<std::string>>;

	+ /**
	+ * Check if an event has been read by the given user
	+ *
	+ * @param eventId eventId of the event to check
	+ * @param userId userId of the given user
	+ * @return true iff the event is read by the user
	+ */
	+ bool isReadBy(const std::string &eventId, const std::string &userId);
	+
	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/testfixtures/factory.cpp b/src/testfixtures/factory.cpp
	index 0b183df..5b6a4b0 100644
	--- a/src/testfixtures/factory.cpp
	+++ b/src/testfixtures/factory.cpp
	@@ -1,321 +1,326 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include "factory.hpp"

	namespace Kazv::Factory
	{
	static std::string generateUserId()
	{
	static std::size_t next = 0;
	++next;
	return "@u" + std::to_string(next) + ":example.com";
	}

	static std::string generateEventId()
	{
	static std::size_t next = 0;
	++next;
	std::stringstream s;
	s << std::setw(40) << std::setfill('0') << next;
	return "$" + s.str();
	}

	static std::string generateRoomId()
	{
	static std::size_t next = 0;
	++next;
	return "!" + std::to_string(next) + ":example.com";
	}

	static std::string generateDeviceId()
	{
	static std::size_t next = 0;
	++next;
	return "dev" + std::to_string(next);
	}

	ClientModel makeClient(const ComposedModifier<ClientModel> &mod)
	{
	ClientModel m;
	m.serverUrl = "example.com";
	m.userId = "@bob:example.com";
	m.token = "exampletoken";
	m.deviceId = "exampledevice";
	m.loggedIn = true;
	mod(m);
	return m;
	}

	ComposedModifier<ClientModel> withRoom(RoomModel room)
	{
	return [room](ClientModel &m) {
	m.roomList.rooms = m.roomList.rooms.set(room.roomId, room);
	};
	}

	ComposedModifier<ClientModel> withAccountData(immer::flex_vector<Event> accountDataEvent)
	{
	return [accountDataEvent](ClientModel &m) {
	m.accountData = merge(std::move(m.accountData), accountDataEvent, keyOfAccountData);
	};
	}

	ComposedModifier<ClientModel> withCrypto(const Crypto &crypto)
	{
	return [crypto](ClientModel &m) {
	m.crypto = crypto;
	};
	}

	ComposedModifier<ClientModel> withDevice(std::string userId, DeviceKeyInfo info)
	{
	return [userId, info](ClientModel &m) {
	m.deviceLists.deviceLists = std::move(m.deviceLists.deviceLists)
	.update(userId, [=](auto deviceMap) {
	return std::move(deviceMap).set(info.deviceId, info);
	});
	};
	}

	DeviceKeyInfo makeDeviceKeyInfo(const ComposedModifier<DeviceKeyInfo> &mod)
	{
	DeviceKeyInfo m;
	mod(m);
	if (m.deviceId.empty()) {
	withDeviceId(generateDeviceId())(m);
	}
	if (m.ed25519Key.empty()) {
	m.ed25519Key = m.deviceId + "ed25519";
	}
	if (m.curve25519Key.empty()) {
	m.curve25519Key = m.deviceId + "curve25519";
	}
	return m;
	}

	ComposedModifier<DeviceKeyInfo> withDeviceId(std::string deviceId)
	{
	return [deviceId](DeviceKeyInfo &m) { m.deviceId = deviceId; };
	}

	ComposedModifier<DeviceKeyInfo> withDeviceDisplayName(std::string displayName)
	{
	return [displayName](DeviceKeyInfo &m) { m.displayName = displayName; };
	}

	ComposedModifier<DeviceKeyInfo> withDeviceTrustLevel(DeviceTrustLevel trustLevel)
	{
	return [trustLevel](DeviceKeyInfo &m) { m.trustLevel = trustLevel; };
	}

	Crypto makeCrypto(const ComposedModifier<Crypto> &mod)
	{
	auto m = Crypto(RandomTag{}, genRandomData(Crypto::constructRandomSize()));
	mod(m);
	return m;
	}

	RoomModel makeRoom(const ComposedModifier<RoomModel> &mod)
	{
	RoomModel room;
	room.roomId = generateRoomId();
	mod(room);
	return room;
	}

	ComposedModifier<RoomModel> withRoomId(std::string id)
	{
	return [id](RoomModel &m) { m.roomId = id; };
	}

	ComposedModifier<RoomModel> withRoomAccountData(immer::flex_vector<Event> accountDataEvent)
	{
	return [accountDataEvent](RoomModel &m) {
	m.accountData = merge(std::move(m.accountData), accountDataEvent, keyOfAccountData);
	};
	}

	ComposedModifier<RoomModel> withRoomState(immer::flex_vector<Event> stateEvent)
	{
	return [stateEvent](RoomModel &m) {
	m.stateEvents = merge(std::move(m.stateEvents), stateEvent, keyOfState);
	};
	}

	ComposedModifier<RoomModel> withRoomTimeline(immer::flex_vector<Event> timelineEvents)
	{
	return [timelineEvents](RoomModel &m) {
	m = RoomModel::update(m, AddToTimelineAction{timelineEvents, std::nullopt, std::nullopt, std::nullopt});
	};
	}

	ComposedModifier<RoomModel> withRoomTimelineGaps(immer::map<std::string, std::string> timelineGaps)
	{
	return [timelineGaps](RoomModel &m) {
	m.timelineGaps = timelineGaps;
	};
	}

	ComposedModifier<RoomModel> withRoomMembership(RoomMembership membership)
	{
	return [membership](RoomModel &m) {
	m.membership = membership;
	};
	}

	ComposedModifier<RoomModel> withRoomEncrypted(bool encrypted)
	{
	return [encrypted](RoomModel &m) {
	m.encrypted = encrypted;
	};
	}

	Event makeEvent(const ComposedModifier<Event> &mod)
	{
	Event e = json{
	{"type", "m.room.message"},
	{"sender", "@foo:tusooa.xyz"},
	{"content", {
	{"msgtype", "m.text"},
	{"body", "test"},
	}},
	{"origin_server_ts", 1000},
	{"event_id", generateEventId()},
	};
	mod(e);
	return e;
	}

	Event makeMemberEvent(const ComposedModifier<Event> &mod)
	{
	auto userId = generateUserId();
	auto event = makeEvent(
	withEventType("m.room.member")
	\| withStateKey(userId)
	\| withEventContent(json::object())
	\| withMembership("join")
	\| mod
	);
	if (event.sender().empty()) {
	withEventSenderId(event.stateKey());
	}
	return event;
	}

	ComposedModifier<Event> withEventJson(const json &j)
	{
	return [j](Event &e) {
	e = Event(j);
	};
	}

	ComposedModifier<Event> withEventKV(const json::json_pointer &k, const json &v)
	{
	return [k, v](Event &e) {
	auto j = e.originalJson().get();
	j[k] = v;
	withEventJson(j)(e);
	};
	}

	+ ComposedModifier<Event> withEventTs(Timestamp ts)
	+ {
	+ return withEventKV("/origin_server_ts"_json_pointer, ts);
	+ }
	+
	ComposedModifier<Event> withEventId(std::string id)
	{
	return withEventKV("/event_id"_json_pointer, id);
	}

	ComposedModifier<Event> withEventType(std::string type)
	{
	return withEventKV("/type"_json_pointer, type);
	}

	ComposedModifier<Event> withEventContent(const json &content)
	{
	return withEventKV("/content"_json_pointer, content);
	}

	ComposedModifier<Event> withStateKey(std::string id)
	{
	return withEventKV("/state_key"_json_pointer, id);
	}

	ComposedModifier<Event> withMembership(std::string membership)
	{
	return withEventKV("/content/membership"_json_pointer, membership);
	}

	ComposedModifier<Event> withMemberDisplayName(std::string displayName)
	{
	return withEventKV("/content/displayname"_json_pointer, displayName);
	}

	ComposedModifier<Event> withMemberAvatarUrl(std::string avatarUrl)
	{
	return withEventKV("/content/avatar_url"_json_pointer, avatarUrl);
	}

	ComposedModifier<Event> withEventSenderId(std::string sender)
	{
	return withEventKV("/sender"_json_pointer, sender);
	}

	ComposedModifier<Event> withEventRelationship(std::string relType, std::string eventId)
	{
	return withEventKV("/content/m.relates_to"_json_pointer, {
	{"rel_type", relType},
	{"event_id", eventId},
	});
	}

	ComposedModifier<Event> withEventReplyTo(std::string eventId)
	{
	return withEventKV("/content/m.relates_to"_json_pointer, {
	{"m.in_reply_to", {{"event_id", eventId}}},
	});
	}

	Response makeResponse(std::string jobId, const ComposedModifier<Response> &mod)
	{
	Response r;
	(withResponseStatusCode(200)
	\| withResponseJsonBody(json::object())
	\| withResponseDataKV("-job-id", jobId)
	\| mod)(r);
	return r;
	}

	ComposedModifier<Response> withResponseStatusCode(int code)
	{
	return withAttr(&Response::statusCode, code);
	}

	ComposedModifier<Response> withResponseJsonBody(const json &body)
	{
	return withAttr(&Response::body, JsonWrap(body));
	}

	ComposedModifier<Response> withResponseBytesBody(const Bytes &body)
	{
	return withAttr(&Response::body, body);
	}

	ComposedModifier<Response> withResponseFileBody(const FileDesc &body)
	{
	return withAttr(&Response::body, body);
	}

	ComposedModifier<Response> withResponseDataKV(std::string k, const json &v)
	{
	return [k, v](Response &m) {
	auto data = m.extraData.get();
	if (!data.is_object()) {
	data = json::object();
	}
	data[k] = v;
	m.extraData = data;
	};
	}
	}
	diff --git a/src/testfixtures/factory.hpp b/src/testfixtures/factory.hpp
	index 9997404..e5990cc 100644
	--- a/src/testfixtures/factory.hpp
	+++ b/src/testfixtures/factory.hpp
	@@ -1,105 +1,106 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

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

	#include <client-model.hpp>

	namespace Kazv
	{
	namespace Factory
	{
	template<class ModelType>
	struct ComposedModifier : std::function<void(ModelType &)>
	{
	using BaseT = std::function<void(ModelType &)>;
	using BaseT::BaseT;
	using BaseT::operator();

	ComposedModifier() : BaseT([](ModelType &) {}) {}

	ComposedModifier operator\|(const ComposedModifier &that) const
	{
	return ComposedModifier([that, *this](ModelType &model) {
	(*this)(model);
	that(model);
	});
	}
	};

	template<class PointerToMember>
	struct AttrModifier
	{};

	template<class ModelType, class DataType>
	struct AttrModifier<DataType ModelType::*> : public ComposedModifier<ModelType>
	{
	using BaseT = ComposedModifier<ModelType>;
	using PtrT = DataType ModelType::*;
	using ModelT = ModelType;
	using DataT = DataType;

	AttrModifier(PtrT ptr, const DataType &data)
	: BaseT([ptr, data](ModelType &m) {
	m.*ptr = data;
	})
	{}
	};

	template<class PointerToMember>
	AttrModifier<PointerToMember> withAttr(PointerToMember p, const typename AttrModifier<PointerToMember>::DataT &data)
	{
	return AttrModifier<PointerToMember>(p, data);
	}

	ClientModel makeClient(const ComposedModifier<ClientModel> &mod = {});
	ComposedModifier<ClientModel> withRoom(RoomModel room);
	ComposedModifier<ClientModel> withAccountData(immer::flex_vector<Event> accountDataEvent);
	ComposedModifier<ClientModel> withCrypto(const Crypto &crypto);
	ComposedModifier<ClientModel> withDevice(std::string userId, DeviceKeyInfo info);

	DeviceKeyInfo makeDeviceKeyInfo(const ComposedModifier<DeviceKeyInfo> &mod = {});
	ComposedModifier<DeviceKeyInfo> withDeviceId(std::string deviceId);
	ComposedModifier<DeviceKeyInfo> withDeviceDisplayName(std::string displayName);
	ComposedModifier<DeviceKeyInfo> withDeviceTrustLevel(DeviceTrustLevel trustLevel);

	Crypto makeCrypto(const ComposedModifier<Crypto> &mod = {});

	RoomModel makeRoom(const ComposedModifier<RoomModel> &mod = {});

	ComposedModifier<RoomModel> withRoomId(std::string id);
	ComposedModifier<RoomModel> withRoomAccountData(immer::flex_vector<Event> accountDataEvent);
	ComposedModifier<RoomModel> withRoomState(immer::flex_vector<Event> stateEvent);
	ComposedModifier<RoomModel> withRoomInviteState(immer::flex_vector<Event> stateEvent);
	ComposedModifier<RoomModel> withRoomTimeline(immer::flex_vector<Event> timelineEvents);
	ComposedModifier<RoomModel> withRoomTimelineGaps(immer::map<std::string, std::string> timelineGaps);
	ComposedModifier<RoomModel> withRoomMembership(RoomMembership membership);
	ComposedModifier<RoomModel> withRoomEncrypted(bool encrypted);

	Event makeEvent(const ComposedModifier<Event> &mod = {});
	Event makeMemberEvent(const ComposedModifier<Event> &mod = {});
	ComposedModifier<Event> withEventJson(const json &j);
	ComposedModifier<Event> withEventKV(const json::json_pointer &k, const json &v);
	+ ComposedModifier<Event> withEventTs(Timestamp ts);
	ComposedModifier<Event> withEventId(std::string id);
	ComposedModifier<Event> withEventType(std::string type);
	ComposedModifier<Event> withEventContent(const json &content);
	ComposedModifier<Event> withStateKey(std::string id);
	ComposedModifier<Event> withMembership(std::string membership);
	ComposedModifier<Event> withMemberDisplayName(std::string displayName);
	ComposedModifier<Event> withMemberAvatarUrl(std::string avatarUrl);
	ComposedModifier<Event> withEventSenderId(std::string sender);
	ComposedModifier<Event> withEventRelationship(std::string relType, std::string eventId);
	ComposedModifier<Event> withEventReplyTo(std::string eventId);

	Response makeResponse(std::string jobId, const ComposedModifier<Response> &mod = {});
	ComposedModifier<Response> withResponseStatusCode(int code);
	ComposedModifier<Response> withResponseJsonBody(const json &body);
	ComposedModifier<Response> withResponseBytesBody(const Bytes &body);
	ComposedModifier<Response> withResponseFileBody(const FileDesc &body);
	ComposedModifier<Response> withResponseDataKV(std::string k, const json &v);
	}
	}
	diff --git a/src/tests/client/room/read-receipt-test.cpp b/src/tests/client/room/read-receipt-test.cpp
	index da09f83..162d443 100644
	--- a/src/tests/client/room/read-receipt-test.cpp
	+++ b/src/tests/client/room/read-receipt-test.cpp
	@@ -1,410 +1,438 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <libkazv-config.hpp>

	#include <boost/asio.hpp>

	#include <catch2/catch_test_macros.hpp>
	#include <catch2/matchers/catch_matchers_range_equals.hpp>

	#include <lager/event_loop/boost_asio.hpp>

	#include <asio-promise-handler.hpp>
	#include <room/room-model.hpp>
	#include <sdk-model.hpp>
	#include <client/client.hpp>
	#include <client/actions/ephemeral.hpp>
	#include <cprjobhandler.hpp>
	#include <lagerstoreeventemitter.hpp>

	#include <testfixtures/factory.hpp>

	#include "client-test-util.hpp"
	#include "action-mock-utils.hpp"
	#include "push-rules-test-util.hpp"

	using namespace Kazv;
	using namespace Kazv::Factory;

	TEST_CASE("Adding an m.receipt ephemeral event", "[client][room][receipt]")
	{
	auto room = makeRoom();
	auto receiptEvent = makeEvent(
	withEventType("m.receipt")
	// https://spec.matrix.org/v1.8/client-server-api/#events-5
	\| withEventContent(R"({
	"$1435641916114394fHBLK:matrix.org": {
	"m.read": {
	"@rikj:jki.re": {
	"ts": 1436451550453
	}
	},
	"m.read.private": {
	"@self:example.org": {
	"ts": 1661384801651
	}
	}
	}
	})"_json));

	room = RoomModel::update(room, AddEphemeralAction{{receiptEvent}});

	auto receipt = room.readReceipts.at("@rikj:jki.re");
	REQUIRE(
	room.readReceipts.at("@rikj:jki.re")
	==
	ReadReceipt{"$1435641916114394fHBLK:matrix.org", 1436451550453}
	);
	REQUIRE(
	room.eventReadUsers.at("$1435641916114394fHBLK:matrix.org")
	==
	immer::flex_vector<std::string>{"@rikj:jki.re", "@self:example.org"}
	);

	auto anotherReceiptEvent = makeEvent(
	withEventType("m.receipt")
	\| withEventContent(json{
	{"$123", {
	{"m.read", {
	{"@foo:example.com", {{"ts", 1796451550450}}}
	}},
	}},
	}));

	room = RoomModel::update(room, AddEphemeralAction{{anotherReceiptEvent}});
	// the receipt that was there should still be there.
	REQUIRE(
	room.readReceipts.at("@rikj:jki.re")
	==
	ReadReceipt{"$1435641916114394fHBLK:matrix.org", 1436451550453}
	);

	REQUIRE(
	room.readReceipts.at("@foo:example.com")
	==
	ReadReceipt{"$123", 1796451550450}
	);

	boost::asio::io_context io;
	AsioPromiseHandler ph{io.get_executor()};

	auto model = makeClient(withRoom(room));
	auto store = createTestClientStoreFrom(model, ph);
	auto client = Client(store.reader().map([](auto c) { return SdkModel{c}; }),
	store,
	std::nullopt);
	auto r = client.room(room.roomId);
	auto readers1 = r.eventReaders(lager::make_constant<std::string>("$1435641916114394fHBLK:matrix.org")).make().get();
	auto expected1 = immer::flex_vector<EventReader>{{"@rikj:jki.re", 1436451550453}, {"@self:example.org", 1661384801651}};
	REQUIRE_THAT(readers1, Catch::Matchers::UnorderedRangeEquals(expected1));

	auto readers2 = r.eventReaders(lager::make_constant<std::string>("$123")).make().get();
	auto expected2 = immer::flex_vector<EventReader>{{"@foo:example.com", 1796451550450}};
	REQUIRE(readers2 == expected2);
	}

	TEST_CASE("Update a receipt for some user", "[client][room][receipt]")
	{
	auto room = makeRoom();
	auto receiptEvent = makeEvent(
	withEventType("m.receipt")
	// https://spec.matrix.org/v1.8/client-server-api/#events-5
	\| withEventContent(R"({
	"$1435641916114394fHBLK:matrix.org": {
	"m.read": {
	"@rikj:jki.re": {
	"ts": 1436451550453
	}
	}
	}
	})"_json));

	room = RoomModel::update(room, AddEphemeralAction{{receiptEvent}});

	auto anotherReceiptEvent = makeEvent(
	withEventType("m.receipt")
	\| withEventContent(json{
	{"$123", {
	{"m.read", {
	{"@rikj:jki.re", {{"ts", 1796451550450}}}
	}},
	}},
	}));

	room = RoomModel::update(room, AddEphemeralAction{{anotherReceiptEvent}});
	REQUIRE(
	room.readReceipts.at("@rikj:jki.re")
	==
	ReadReceipt{"$123", 1796451550450}
	);

	REQUIRE(room.eventReadUsers.count("$1435641916114394fHBLK:matrix.org") == 0);
	REQUIRE(room.eventReadUsers.count("$123") == 1);

	boost::asio::io_context io;
	AsioPromiseHandler ph{io.get_executor()};

	auto model = makeClient(withRoom(room));
	auto store = createTestClientStoreFrom(model, ph);
	auto client = Client(store.reader().map([](auto c) { return SdkModel{c}; }),
	store,
	std::nullopt);
	auto r = client.room(room.roomId);
	auto readers1 = r.eventReaders(lager::make_constant<std::string>("$1435641916114394fHBLK:matrix.org")).make().get();
	auto expected1 = immer::flex_vector<EventReader>{};
	REQUIRE(readers1 == expected1);

	auto readers2 = r.eventReaders(lager::make_constant<std::string>("$123")).make().get();
	auto expected2 = immer::flex_vector<EventReader>{{"@rikj:jki.re", 1796451550450}};
	REQUIRE(readers2 == expected2);
	}

	TEST_CASE("localReadMarker", "[client][room][receipt]")
	{
	boost::asio::io_context io;
	AsioPromiseHandler ph{io.get_executor()};

	auto tl = EventList{
	makeEvent(),
	};
	auto room = makeRoom(withRoomTimeline(tl));
	room.localReadMarker = tl[0].id();
	auto model = makeClient(withRoom(room));
	auto store = createTestClientStoreFrom(model, ph);
	auto client = Client(store.reader().map([](auto c) { return SdkModel{c}; }),
	store,
	std::nullopt);
	auto r = client.room(room.roomId);
	REQUIRE(r.localReadMarker().get() == tl[0].id());
	}

	TEST_CASE("Posting receipts", "[client][room][receipt]")
	{
	auto r = makeRoom();
	auto m = makeClient(withRoom(r));

	boost::asio::io_context io;
	SingleTypePromiseInterface<EffectStatus> sgph{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 dispatcher = getMockDispatcher(
	sgph,
	ctx,
	returnEmpty<PostReceiptAction>()
	);
	auto mockContext = getMockContext(sgph, dispatcher);
	auto client = Client(Client::InEventLoopTag{}, mockContext, sdk.context());

	auto room = client.room(r.roomId);

	room.postReceipt("$1")
	.then([&io](auto) {
	io.stop();
	});
	io.run();

	REQUIRE(dispatcher.template calledTimes<PostReceiptAction>() == 1);
	auto action = dispatcher.template of<PostReceiptAction>()[0];
	REQUIRE(action.roomId == r.roomId);
	REQUIRE(action.eventId == "$1");
	}

	TEST_CASE("PostReceiptAction", "[client][room][receipt]")
	{
	auto m = makeClient();
	auto [next, _ignore] = updateClient(m, PostReceiptAction{"!someroom:example.com", "$someevent"});
	assert1Job(next);
	for1stJob(next, [](const BaseJob &job) {
	REQUIRE(job.jobId() == "PostReceipt");
	REQUIRE(job.url().find("rooms/!someroom:example.com/receipt/m.read/$someevent") != std::string::npos);
	REQUIRE(json::parse(std::get<Bytes>(job.requestBody())) == json::object());
	});
	}

	static auto pushRules = PushRulesDesc(Event(R"({
	"type": "m.push_rules",
	"content": {
	"global": {
	"override": [{
	"rule_id": "moe.kazv.mxc.some-rule",
	"default": true,
	"enabled": true,
	"conditions": [{
	"kind": "event_match",
	"key": "type",
	"pattern": "moe.kazv.mxc.test-event"
	}],
	"actions": ["notify"]
	}]
	}
	}
	})"_json));

	TEST_CASE("AddLocalNotificationsAction", "[client][room][receipt]")
	{
	auto myUserId = "@mew:example.com"s;

	auto newEvents = EventList{
	makeEvent(withEventType("moe.kazv.mxc.test-event")),
	makeEvent(),
	makeEvent(withEventType("moe.kazv.mxc.test-event")),
	makeEvent(withEventType("moe.kazv.mxc.test-event") \| withEventSenderId(myUserId)),
	makeEvent(withEventType("moe.kazv.mxc.test-event")),
	};
	auto r = makeRoom(withRoomTimeline(newEvents));
	r.readReceipts = {{myUserId, ReadReceipt{newEvents[0].id(), 0}}};

	WHEN("push rules does not notify") {
	auto next = RoomModel::update(r, AddLocalNotificationsAction{
	newEvents,
	PushRulesDesc(Event()),
	myUserId,
	});
	REQUIRE(next.unreadNotificationEventIds == immer::flex_vector<std::string>{});
	}

	WHEN("push rules notifies some") {
	auto next = RoomModel::update(r, AddLocalNotificationsAction{
	newEvents,
	pushRules,
	myUserId,
	});
	REQUIRE(
	next.unreadNotificationEventIds
	== immer::flex_vector<std::string>{
	newEvents[2].id(),
	newEvents[4].id(),
	}
	);
	}

	WHEN("push rules notifies some but is before local read marker, only things after local read marker is added") {
	r.localReadMarker = newEvents[3].id();
	auto next = RoomModel::update(r, AddLocalNotificationsAction{
	newEvents,
	pushRules,
	myUserId,
	});

	REQUIRE(
	next.unreadNotificationEventIds
	== immer::flex_vector<std::string>{
	newEvents[4].id(),
	}
	);
	}
	}

	TEST_CASE("PostReceiptAction should update local read marker and remove read notifications")
	{
	auto myUserId = "@mew:example.com"s;

	auto newEvents = EventList{
	makeEvent(withEventType("moe.kazv.mxc.test-event")),
	makeEvent(withEventType("moe.kazv.mxc.test-event")),
	makeEvent(withEventType("moe.kazv.mxc.test-event")),
	};
	auto r = makeRoom(withRoomTimeline(newEvents));
	r.readReceipts = {{myUserId, ReadReceipt{newEvents[0].id(), 0}}};
	r = RoomModel::update(r, AddLocalNotificationsAction{
	newEvents,
	pushRules,
	myUserId,
	});

	auto client = makeClient(withRoom(r));
	client.userId = myUserId;
	auto receiptPos = newEvents[1].id();
	auto [next, _] = ClientModel::update(client, PostReceiptAction{r.roomId, receiptPos});
	auto nextRoom = next.roomList.rooms.at(r.roomId);
	REQUIRE(nextRoom.localReadMarker == receiptPos);
	REQUIRE(nextRoom.unreadNotificationEventIds == immer::flex_vector<std::string>{newEvents[2].id()});
	}

	TEST_CASE("RemoveReadLocalNotificationsAction", "[client][room][receipt]")
	{
	auto myUserId = "@mew:example.com"s;

	auto oldEvents = EventList{
	makeEvent(),
	makeEvent(),
	};
	auto newEvents = EventList{
	makeEvent(),
	makeEvent(),
	makeEvent(),
	makeEvent(),
	makeEvent(),
	makeEvent(),
	};
	auto timeline = oldEvents + newEvents;
	auto r = makeRoom(withRoomTimeline(timeline));
	r.unreadNotificationEventIds = intoImmer(
	immer::flex_vector<std::string>(),
	zug::map(&Event::id),
	newEvents.erase(5)
	);

	WHEN("a read receipt is in the middle") {
	r.readReceipts = {{myUserId, ReadReceipt{newEvents[2].id(), 0}}};
	auto next = RoomModel::update(r, RemoveReadLocalNotificationsAction{myUserId});
	REQUIRE(next.unreadNotificationEventIds == immer::flex_vector<std::string>{newEvents[3].id(), newEvents[4].id()});
	}

	WHEN("a read receipt is before the beginning") {
	r.readReceipts = {{myUserId, ReadReceipt{oldEvents[0].id(), 0}}};
	auto next = RoomModel::update(r, RemoveReadLocalNotificationsAction{myUserId});
	REQUIRE(next.unreadNotificationEventIds == r.unreadNotificationEventIds);
	}

	WHEN("a read receipt does not exist") {
	r.readReceipts = {};
	auto next = RoomModel::update(r, RemoveReadLocalNotificationsAction{myUserId});
	REQUIRE(next.unreadNotificationEventIds == r.unreadNotificationEventIds);
	}

	WHEN("a read receipt is at the end") {
	r.readReceipts = {{myUserId, ReadReceipt{newEvents[5].id(), 0}}};
	auto next = RoomModel::update(r, RemoveReadLocalNotificationsAction{myUserId});
	REQUIRE(next.unreadNotificationEventIds == immer::flex_vector<std::string>{});
	}

	WHEN("a read receipt is after the end") {
	r.readReceipts = {{myUserId, ReadReceipt{newEvents[5].id(), 0}}};
	auto next = RoomModel::update(r, RemoveReadLocalNotificationsAction{myUserId});
	REQUIRE(next.unreadNotificationEventIds == immer::flex_vector<std::string>{});
	}
	}

	TEST_CASE("Room::unreadNotificationEventIds()", "[client][room][receipt]")
	{
	boost::asio::io_context io;
	AsioPromiseHandler ph{io.get_executor()};

	auto room = makeRoom();
	room.unreadNotificationEventIds = {"$foo", "$bar"};
	auto model = makeClient(withRoom(room));
	auto store = createTestClientStoreFrom(model, ph);
	auto client = Client(store.reader().map([](auto c) { return SdkModel{c}; }),
	store,
	std::nullopt);

	auto r = client.room(room.roomId);
	REQUIRE(r.unreadNotificationEventIds().get()
	== room.unreadNotificationEventIds);
	}
	+
	+TEST_CASE("RoomModel::isReadBy", "[client][room][receipt]")
	+{
	+ auto room = makeRoom();
	+ auto receiptEvent = makeEvent(
	+ withEventType("m.receipt")
	+ // https://spec.matrix.org/v1.8/client-server-api/#events-5
	+ \| withEventContent(R"({
	+ "$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Z2": {
	+ "m.read": {
	+ "@rikj:jki.re": {
	+ "ts": 1145141919810
	+ }
	+ }
	+ }
	+ })"_json));
	+ auto timeline = EventList{makeEvent(withEventTs(1436451550452) \| withEventId("$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Z0")),
	+ makeEvent(withEventTs(1436451550453) \| withEventId("$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Z7")),
	+ makeEvent(withEventTs(1436451550453) \| withEventId("$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Z2")),
	+ makeEvent(withEventTs(1436451550454) \| withEventId("$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Z1"))
	+ };
	+ room = RoomModel::update(std::move(room), AddMessagesAction{timeline});
	+ room = RoomModel::update(std::move(room), AddEphemeralAction({receiptEvent}));
	+ REQUIRE(room.isReadBy("$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Z0", "@rikj:jki.re") == true);
	+ REQUIRE(room.isReadBy("$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Z7", "@rikj:jki.re") == false);
	+ REQUIRE(room.isReadBy("$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Z2", "@rikj:jki.re") == true);
	+ REQUIRE(room.isReadBy("$Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Z1", "@rikj:jki.re") == false);
	+}

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