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	diff --git a/src/client/room/room-model.cpp b/src/client/room/room-model.cpp
	index f12dfa5..c775704 100644
	--- a/src/client/room/room-model.cpp
	+++ b/src/client/room/room-model.cpp
	@@ -1,339 +1,370 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2020 Tusooa Zhu
	* 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"


	namespace Kazv
	{
	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;
	},
	[&](AppendTimelineAction a) {
	auto eventIds = intoImmer(immer::flex_vector<std::string>(),
	zug::map(keyOfTimeline), a.events);
	r.timeline = r.timeline + eventIds;
	r.messages = merge(std::move(r.messages), a.events, keyOfTimeline);
	return r;
	},
	[&](PrependTimelineAction a) {
	auto eventIds = intoImmer(immer::flex_vector<std::string>(),
	zug::map(keyOfTimeline), a.events);
	r.timeline = eventIds + r.timeline;
	r.messages = merge(std::move(r.messages), a.events, keyOfTimeline);
	r.paginateBackToken = a.paginateBackToken;
	// if there are no more events we should not allow further paginating
	r.canPaginateBack = a.events.size() != 0;
	return r;
	},
	[&](AddToTimelineAction a) {
	auto eventIds = intoImmer(immer::flex_vector<std::string>(),
	zug::map(keyOfTimeline), a.events);

	auto oldMessages = r.messages;
	r.messages = merge(std::move(r.messages), a.events, keyOfTimeline);
	auto exists =
	[=](auto eventId) -> bool {
	return !! oldMessages.find(eventId);
	};
	auto key =
	[=](auto eventId) {
	// sort first by timestamp, then by id
	return std::make_tuple(r.messages[eventId].originServerTs(), eventId);
	};

	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);

	r.timeline = sortedUniqueMerge(r.timeline, eventIds, exists, key);

	// TODO need other way to determine whether it is limited
	// in a pagination request (/messages does not have that field)
	if ((! a.limited.has_value() \|\| a.limited.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());
	}
	}

	// 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;

	std::for_each(thisBatchStart + 1, origBatchStart,
	[&](auto eventId) {
	r.timelineGaps = std::move(r.timelineGaps).erase(eventId);
	});
	}

	// remove all local echoes that are received
	for (const auto &e : a.events) {
	const auto &json = e.originalJson().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>()});
	}
	}

	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) {
	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;
	}
	);
	}

	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;
	}
	);
	}

	immer::flex_vector<std::string> RoomModel::joinedMemberIds() const
	{
	using MemberNode = std::pair<std::string, Kazv::Event>;

	auto memberNameTransducer =
	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 MemberNode{stateKey, v};
	})
	\| zug::filter(
	[](auto val) {
	auto [stateKey, ev] = val;
	return ev.content().get()
	.at("membership"s) == "join"s;
	})
	\| zug::map(
	[](auto val) {
	auto [stateKey, ev] = val;
	return stateKey;
	});

	return intoImmer(
	immer::flex_vector<std::string>{},
	memberNameTransducer,
	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);
	+ }
	}
	diff --git a/src/client/room/room-model.hpp b/src/client/room/room-model.hpp
	index b0365f2..959aab3 100644
	--- a/src/client/room/room-model.hpp
	+++ b/src/client/room/room-model.hpp
	@@ -1,308 +1,311 @@
	/*
	* 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 <serialization/immer-flex-vector.hpp>
	#include <serialization/immer-box.hpp>
	#include <serialization/immer-map.hpp>
	#include <serialization/immer-array.hpp>

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

	#include <crypto.hpp>

	#include "local-echo.hpp"
	#include "clientutil.hpp"

	namespace Kazv
	{
	struct PendingRoomKeyEvent
	{
	std::string txnId;
	Event event;
	immer::map<std::string, immer::flex_vector<std::string>> devices;
	};

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

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

	struct PrependTimelineAction
	{
	immer::flex_vector<Event> events;
	std::string paginateBackToken;
	};

	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;
	};

	inline bool operator==(const PendingRoomKeyEvent &a, const PendingRoomKeyEvent &b)
	{
	return a.txnId == b.txnId && a.event == b.event && a.devices == b.devices;
	}

	inline bool operator!=(const PendingRoomKeyEvent &a, const PendingRoomKeyEvent &b)
	{
	return !(a == b);
	}

	inline const double ROOM_TAG_DEFAULT_ORDER = 2;

	template<class Archive>
	void serialize(Archive &ar, PendingRoomKeyEvent &e, std::uint32_t const version)
	{
	ar & e.txnId & e.event & e.devices;
	}

	struct RoomModel
	{
	using Membership = RoomMembership;

	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;

	immer::flex_vector<std::string> joinedMemberIds() 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;
	+
	using Action = std::variant<
	AddStateEventsAction,
	AppendTimelineAction,
	PrependTimelineAction,
	AddToTimelineAction,
	AddAccountDataAction,
	ChangeMembershipAction,
	ChangeInviteStateAction,
	AddEphemeralAction,
	SetLocalDraftAction,
	SetRoomEncryptionAction,
	MarkMembersFullyLoadedAction,
	SetHeroIdsAction,
	AddLocalEchoAction,
	RemoveLocalEchoAction,
	AddPendingRoomKeyAction,
	RemovePendingRoomKeyAction
	>;

	static RoomModel update(RoomModel r, Action a);
	};

	using RoomAction = RoomModel::Action;

	inline bool operator==(RoomModel a, RoomModel b)
	{
	return a.roomId == b.roomId
	&& a.stateEvents == b.stateEvents
	&& a.inviteState == b.inviteState
	&& a.timeline == b.timeline
	&& a.messages == b.messages
	&& a.accountData == b.accountData
	&& a.membership == b.membership
	&& a.paginateBackToken == b.paginateBackToken
	&& a.canPaginateBack == b.canPaginateBack
	&& a.timelineGaps == b.timelineGaps
	&& a.ephemeral == b.ephemeral
	&& a.localDraft == b.localDraft
	&& a.encrypted == b.encrypted
	&& a.shouldRotateSessionKey == b.shouldRotateSessionKey
	&& a.membersFullyLoaded == b.membersFullyLoaded
	&& a.heroIds == b.heroIds
	&& a.localEchoes == b.localEchoes
	&& a.pendingRoomKeyEvents == b.pendingRoomKeyEvents;
	}

	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);
	};

	using RoomListAction = RoomListModel::Action;

	inline bool operator==(RoomListModel a, RoomListModel b)
	{
	return a.rooms == b.rooms;
	}

	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;
	}
	}

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

	BOOST_CLASS_VERSION(Kazv::PendingRoomKeyEvent, 0)
	BOOST_CLASS_VERSION(Kazv::RoomModel, 3)
	BOOST_CLASS_VERSION(Kazv::RoomListModel, 0)
	diff --git a/src/client/room/room.cpp b/src/client/room/room.cpp
	index 6e43f4e..198575e 100644
	--- a/src/client/room/room.cpp
	+++ b/src/client/room/room.cpp
	@@ -1,623 +1,641 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2021 Tusooa Zhu <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <libkazv-config.hpp>

	#include <immer/algorithm.hpp>
	#include <debug.hpp>

	#include "room.hpp"

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

	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)
	{
	}

	Room::Room(InEventLoopTag, std::string roomId, ContextT ctx, DepsT deps)
	: m_sdk(std::nullopt)
	, m_roomId(roomId)
	, m_ctx(ctx)
	, m_deps(deps)
	#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());
	}

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

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

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

	auto Room::nameOpt() const -> lager::reader<std::optional<std::string>>
	{
	using namespace lager::lenses;
	return stateEvents()
	[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;
	}));
	}

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

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

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

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

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

	auto rid = +roomId();

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

	auto promise = ctx.createResolvedPromise(true);

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

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

	auto deps = m_deps.value();

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

	auto saveLocalEchoPromise = promise;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	auto Room::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::addOrSetTag(std::string tagId, std::optional<double> order) const -> PromiseT
	+ {
	+ using namespace CursorOp;
	+ return m_ctx.createResolvedPromise({})
	+ .then([that=toEventLoop(), tagId, order](auto) {
	+ return that.setAccountData((+that.roomCursor()).makeAddTagEvent(tagId, order));
	+ });
	+ }
	+
	+ auto Room::removeTag(std::string tagId) const -> PromiseT
	+ {
	+ using namespace CursorOp;
	+ return m_ctx.createResolvedPromise({})
	+ .then([that=toEventLoop(), tagId](auto) {
	+ return that.setAccountData((+that.roomCursor()).makeRemoveTagEvent(tagId));
	+ });
	+ }
	+
	auto Room::setPinnedEvents(immer::flex_vector<std::string> eventIds) const
	-> PromiseT
	{
	json j{
	{"type", "m.room.pinned_events"},
	{"content", {
	{"pinned", eventIds}
	}
	}
	};
	Event e{j};
	return sendStateEvent(e);
	}

	auto Room::timelineGaps() const
	-> lager::reader<immer::map<std::string /* eventId */,
	std::string /* prevBatch */>>
	{
	return roomCursor()[&RoomModel::timelineGaps];
	}

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

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

	auto Room::pendingRoomKeyEvents() const -> lager::reader<immer::flex_vector<PendingRoomKeyEvent>>
	{
	return roomCursor()[&RoomModel::pendingRoomKeyEvents];
	}
	}
	diff --git a/src/client/room/room.hpp b/src/client/room/room.hpp
	index ee741be..b3c4eb2 100644
	--- a/src/client/room/room.hpp
	+++ b/src/client/room/room.hpp
	@@ -1,611 +1,632 @@
	/*
	* 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"

	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];
	}

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

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

	/* lager::reader<RangeT<Event>> */
	inline auto timelineEvents() const {
	return roomCursor()
	.xform(zug::map([](auto r) {
	auto messages = r.messages;
	auto timeline = r.timeline;
	return intoImmer(
	immer::flex_vector<Event>{},
	zug::map([=](auto eventId) {
	return messages[eventId];
	}),
	timeline);
	}));
	}

	/**
	* Get the 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.
	*/
	/* lager::reader<std::string> */
	inline auto name() const {
	using namespace lager::lenses;
	return stateEvents()
	[KeyOfState{"m.room.name", ""}]
	[or_default]
	.xform(zug::map([](Event ev) {
	auto content = ev.content().get();
	return
	content.contains("name")
	? std::string(content["name"])
	// TODO: use heroes to generate a name
	: "<no name>";
	}));
	}

	/**
	* 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>;

	/* lager::reader<RangeT<std::string>> */
	inline auto members() const {
	return roomCursor().xform(zug::map([=](auto room) {
	return room.joinedMemberIds();
	}));
	}

	inline auto memberEventByCursor(lager::reader<std::string> userId) const {
	return lager::with(roomCursor()[&RoomModel::stateEvents], userId)
	.xform(zug::map([](auto events, auto userId) {
	auto k = KeyOfState{"m.room.member", userId};
	return events[k];
	}));
	}

	/* lager::reader<std::optional<Event>> */
	inline auto memberEventFor(std::string userId) const {
	return memberEventByCursor(lager::make_constant(userId));
	}

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

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

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

	/**
	* 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];
	}

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

	/**
	* 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;

	+ /**
	+ * Add or set a tag to this room.
	+ *
	+ * @param tagId The tag id to add or set.
	+ * @param order The order to specify.
	+ *
	+ * @return A Promise that resolves when the tag
	+ * has been set, or when there is an error.
	+ */
	+ PromiseT addOrSetTag(std::string tagId, std::optional<double> order = std::nullopt) const;
	+
	+ /**
	+ * Remove a tag from this room.
	+ *
	+ * @param tagId The tag id to remove.
	+ *
	+ * @return A Promise that resolves when the tag
	+ * has been removed, or when there is an error.
	+ */
	+ PromiseT removeTag(std::string tagId) const;
	+
	/**
	* Leave this room.
	*
	* @return A Promise that resolves when the state event
	* for the leaving has been sent, or when there is an error.
	*/
	PromiseT leave() const;

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

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

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

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

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

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

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

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

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

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

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

	private:
	const lager::reader<SdkModel> &sdkCursor() const;
	lager::reader<RoomModel> roomCursor() const;
	std::string currentRoomId() 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;
	KAZV_DECLARE_THREAD_ID();
	KAZV_DECLARE_EVENT_LOOP_THREAD_ID_KEEPER(m_deps.has_value() ? &lager::get<EventLoopThreadIdKeeper &>(m_deps.value()) : 0);
	};
	}
	diff --git a/src/tests/client/account-data-test.cpp b/src/tests/client/account-data-test.cpp
	index c9085af..bd7f48c 100644
	--- a/src/tests/client/account-data-test.cpp
	+++ b/src/tests/client/account-data-test.cpp
	@@ -1,124 +1,289 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <libkazv-config.hpp>

	#include <catch2/catch_test_macros.hpp>

	#include <lager/event_loop/boost_asio.hpp>

	#include <boost/asio.hpp>
	#include <cprjobhandler.hpp>
	#include <asio-promise-handler.hpp>
	#include <lagerstoreeventemitter.hpp>
	#include <cursorutil.hpp>
	#include <sdk-model.hpp>
	#include <client/client.hpp>

	#include "client-test-util.hpp"

	Event accountDataEvent = R"({
	"type": "moe.kazv.mxc.kazv.some-event",
	"content": {
	"test": 1
	}
	})"_json;

	TEST_CASE("Send set account data by room job", "[client][account-data]")
	{
	ClientModel loggedInModel = createTestClientModel();

	auto [resModel, dontCareEffect] = ClientModel::update(
	loggedInModel, SetAccountDataPerRoomAction{"!room:example.com", accountDataEvent});

	assert1Job(resModel);
	for1stJob(resModel, [] (const auto &job) {
	REQUIRE(job.jobId() == "SetAccountDataPerRoom");
	REQUIRE(job.url().find("!room:example.com") != std::string::npos);
	REQUIRE(job.url().find("moe.kazv.mxc.kazv.some-event") != std::string::npos);
	auto jsonBody = json::parse(std::get<BytesBody>(job.requestBody()));
	REQUIRE(jsonBody == accountDataEvent.content().get());
	});
	}

	TEST_CASE("Process account data by room response", "[client][account-data]")
	{
	boost::asio::io_context io;
	AsioPromiseHandler ph{io.get_executor()};

	auto store = createTestClientStore(ph);

	WHEN("Success response")
	{
	auto succResponse = createResponse("SetAccountDataPerRoom", json::object({}));
	store.dispatch(ProcessResponseAction{succResponse})
	.then([] (auto stat) {
	REQUIRE(stat.success());
	});
	}

	WHEN("Failed response")
	{
	auto failResponse = createResponse("SetAccountDataPerRoom", R"({
	"errcode": "M_FORBIDDEN",
	"error": "Cannot add account data for other users."
	})"_json);
	failResponse.statusCode = 403;
	store.dispatch(ProcessResponseAction{failResponse})
	.then([] (auto stat) {
	REQUIRE(!stat.success());
	REQUIRE(stat.dataStr("error") == "Cannot add account data for other users.");
	REQUIRE(stat.dataStr("errorCode") == "M_FORBIDDEN");
	});
	}

	io.run();
	}

	TEST_CASE("Room::setAccountData()", "[client][account-data]")
	{
	boost::asio::io_context io;
	SingleTypePromiseInterface<EffectStatus> ph{AsioPromiseHandler{io.get_executor()}};

	ClientModel m;
	RoomModel room;
	room.roomId = "!room:example.com";
	m.roomList.rooms = m.roomList.rooms.set("!room:example.com", room);
	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 setAccountDataCalled = false;
	auto mockContext = typename Client::ContextT([&ph, &setAccountDataCalled](const auto &action) {
	if (std::holds_alternative<SetAccountDataPerRoomAction>(action)) {
	setAccountDataCalled = true;
	auto a = std::get<SetAccountDataPerRoomAction>(action);
	REQUIRE(a.roomId == "!room:example.com");
	REQUIRE(a.accountDataEvent == accountDataEvent);
	return ph.createResolved(EffectStatus(true, json::object()));
	}
	throw std::runtime_error{"unhandled action"};
	}, ph, lager::deps<>{});

	auto client = Client(Client::InEventLoopTag{}, mockContext, sdk.context());
	auto r = client.room("!room:example.com");
	r.setAccountData(accountDataEvent)
	.then([&io](auto) {
	io.stop();
	});

	io.run();

	REQUIRE(setAccountDataCalled);
	}
	+
	+Event tagEvent = R"({
	+ "type": "m.tag",
	+ "content": {
	+ "tags": {
	+ "m.favourite": 0
	+ }
	+ }
	+})"_json;
	+
	+TEST_CASE("Room::addOrSetTag()", "[client][account-data][tagging]")
	+{
	+ boost::asio::io_context io;
	+ SingleTypePromiseInterface<EffectStatus> ph{AsioPromiseHandler{io.get_executor()}};
	+
	+ ClientModel m;
	+ RoomModel room;
	+ room.roomId = "!room:example.com";
	+ room.accountData = room.accountData.set(tagEvent.type(), tagEvent);
	+ m.roomList.rooms = m.roomList.rooms.set("!room:example.com", room);
	+ 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 setAccountDataCalled = false;
	+ auto expectedEvent = Event();
	+ auto mockContext = typename Client::ContextT([&ph, &expectedEvent, &setAccountDataCalled](const auto &action) {
	+ if (std::holds_alternative<SetAccountDataPerRoomAction>(action)) {
	+ setAccountDataCalled = true;
	+ auto a = std::get<SetAccountDataPerRoomAction>(action);
	+ REQUIRE(a.roomId == "!room:example.com");
	+ REQUIRE(a.accountDataEvent == expectedEvent);
	+ return ph.createResolved(EffectStatus(true, json::object()));
	+ }
	+ throw std::runtime_error{"unhandled action"};
	+ }, ph, lager::deps<>{});
	+
	+ auto client = Client(Client::InEventLoopTag{}, mockContext, sdk.context());
	+ auto r = client.room("!room:example.com");
	+
	+ SECTION("adding new tag")
	+ {
	+ auto expectedJson = tagEvent.raw().get();
	+ expectedJson["content"]["tags"]["u.xxx"] = {{"order", 0.2}};
	+ expectedEvent = expectedJson;
	+
	+ r.addOrSetTag("u.xxx", 0.2)
	+ .then([&io](auto) {
	+ io.stop();
	+ });
	+ }
	+
	+ SECTION("adding new tag, no order")
	+ {
	+ auto expectedJson = tagEvent.raw().get();
	+ expectedJson["content"]["tags"]["u.xxx"] = json::object();
	+ expectedEvent = expectedJson;
	+
	+ r.addOrSetTag("u.xxx")
	+ .then([&io](auto) {
	+ io.stop();
	+ });
	+ }
	+
	+ SECTION("updating existing tag")
	+ {
	+ auto expectedJson = tagEvent.raw().get();
	+ expectedJson["content"]["tags"]["m.favourite"] = {{"order", 0.5}};
	+ expectedEvent = expectedJson;
	+
	+ r.addOrSetTag("m.favourite", 0.5)
	+ .then([&io](auto) {
	+ io.stop();
	+ });
	+ }
	+
	+ SECTION("updating existing tag, no order")
	+ {
	+ auto expectedJson = tagEvent.raw().get();
	+ expectedJson["content"]["tags"]["m.favourite"] = json::object();
	+ expectedEvent = expectedJson;
	+
	+ r.addOrSetTag("m.favourite")
	+ .then([&io](auto) {
	+ io.stop();
	+ });
	+ }
	+
	+ io.run();
	+
	+ REQUIRE(setAccountDataCalled);
	+}
	+
	+TEST_CASE("Room::removeTag()", "[client][account-data][tagging]")
	+{
	+ boost::asio::io_context io;
	+ SingleTypePromiseInterface<EffectStatus> ph{AsioPromiseHandler{io.get_executor()}};
	+
	+ ClientModel m;
	+ RoomModel room;
	+ room.roomId = "!room:example.com";
	+ room.accountData = room.accountData.set(tagEvent.type(), tagEvent);
	+ m.roomList.rooms = m.roomList.rooms.set("!room:example.com", room);
	+ 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 setAccountDataCalled = false;
	+ auto expectedEvent = Event();
	+ auto mockContext = typename Client::ContextT([&ph, &expectedEvent, &setAccountDataCalled](const auto &action) {
	+ if (std::holds_alternative<SetAccountDataPerRoomAction>(action)) {
	+ setAccountDataCalled = true;
	+ auto a = std::get<SetAccountDataPerRoomAction>(action);
	+ REQUIRE(a.roomId == "!room:example.com");
	+ REQUIRE(a.accountDataEvent == expectedEvent);
	+ return ph.createResolved(EffectStatus(true, json::object()));
	+ }
	+ throw std::runtime_error{"unhandled action"};
	+ }, ph, lager::deps<>{});
	+
	+ auto client = Client(Client::InEventLoopTag{}, mockContext, sdk.context());
	+ auto r = client.room("!room:example.com");
	+
	+ SECTION("removing existing tag")
	+ {
	+ auto expectedJson = tagEvent.raw().get();
	+ expectedJson["content"]["tags"] = json::object();
	+ expectedEvent = expectedJson;
	+
	+ r.removeTag("m.favourite")
	+ .then([&io](auto) {
	+ io.stop();
	+ });
	+ }
	+
	+ SECTION("removing non-existent tag")
	+ {
	+ expectedEvent = tagEvent;
	+
	+ r.removeTag("u.xxx")
	+ .then([&io](auto) {
	+ io.stop();
	+ });
	+ }
	+
	+ io.run();
	+
	+ REQUIRE(setAccountDataCalled);
	+}

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