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	diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
	index a233809..0262b49 100644
	--- a/src/CMakeLists.txt
	+++ b/src/CMakeLists.txt
	@@ -1,88 +1,90 @@
	set(KAZV_DATA_DIR ${KDE_INSTALL_DATADIR})
	set(KAZV_L10N_DIR ${KAZV_DATA_DIR}/l10n)
	if(WIN32)
	set(KAZV_IS_WINDOWS 1)
	else()
	set(KAZV_IS_WINDOWS 0)
	endif()
	configure_file(kazv-path-config.hpp.in kazv-path-config.hpp)
	configure_file(kazv-version.cpp.in kazv-version.cpp)
	configure_file(kazv-platform.hpp.in kazv-platform.hpp)

	set(kazvprivlib_SRCS
	qt-job-handler.cpp
	qt-job.cpp
	${CMAKE_CURRENT_BINARY_DIR}/kazv-version.cpp
	matrix-sdk.cpp
	matrix-room.cpp
	matrix-room-list.cpp
	matrix-room-timeline.cpp
	matrix-room-member.cpp
	matrix-room-member-list-model.cpp
	+ matrix-event-reader.cpp
	+ matrix-event-reader-list-model.cpp
	matrix-event.cpp
	meta-types.cpp
	l10n-provider.cpp
	qt-rand-adapter.cpp
	helper.cpp
	matrix-promise.cpp
	kazv-util.cpp
	matrix-sticker-pack.cpp
	matrix-sticker.cpp
	matrix-sticker-pack-list.cpp
	matrix-sticker-pack-source.cpp

	device-mgmt/matrix-device.cpp
	device-mgmt/matrix-device-list.cpp

	kazv-config.cpp
	kazv-io-manager.cpp
	kazv-io-job.cpp
	kazv-file.cpp
	upload-job-model.cpp
	kazv-markdown.cpp

	shortcuts/shortcut-util.cpp

	register-types.cpp
	)

	ecm_qt_declare_logging_category(kazvprivlib_SRCS
	HEADER kazv-log.hpp
	IDENTIFIER kazvLog
	CATEGORY_NAME moe.kazv.mxc.kazv
	)

	add_library(kazvprivlib STATIC ${kazvprivlib_SRCS})

	target_link_libraries(kazvprivlib PUBLIC
	libkazv::kazvall
	Qt5::Core
	Qt5::Network
	Threads::Threads
	Qt5::Gui Qt5::Qml Qt5::Quick Qt5::QuickControls2 Qt5::Svg Qt5::Concurrent Qt5::Widgets
	KF5::ConfigCore KF5::KIOCore KF5::Notifications
	${CMARK_TARGET_NAME}
	)

	target_include_directories(kazvprivlib PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
	target_include_directories(kazvprivlib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/device-mgmt)

	set(kazv_SRCS
	main.cpp
	resources.qrc
	)

	add_executable(kazv ${kazv_SRCS})

	target_link_libraries(kazv
	PRIVATE
	kazvprivlib
	)
	install(TARGETS kazv ${KF5_INSTALL_TARGETS_DEFAULT_ARGS})
	install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/l10n/
	DESTINATION ${KAZV_L10N_DIR}
	FILES_MATCHING PATTERN "*.ftl"
	PATTERN "*.json"
	)

	add_subdirectory(tests)
	diff --git a/src/matrix-event-reader-list-model.cpp b/src/matrix-event-reader-list-model.cpp
	new file mode 100644
	index 0000000..0dd1d58
	--- /dev/null
	+++ b/src/matrix-event-reader-list-model.cpp
	@@ -0,0 +1,38 @@
	+/*
	+ * This file is part of kazv.
	+ * SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	+ * SPDX-License-Identifier: AGPL-3.0-or-later
	+ */
	+
	+#include <libkazv-config.hpp>
	+#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168
	+
	+#include "matrix-event-reader-list-model.hpp"
	+#include "matrix-event-reader.hpp"
	+
	+using namespace Kazv;
	+
	+MatrixEventReaderListModel::MatrixEventReaderListModel(lager::reader<immer::flex_vector<std::tuple<Kazv::Event, Kazv::Timestamp>>> readers, QObject *parent)
	+ : MatrixRoomMemberListModel(
	+ readers.xform(containerMap(EventList{}, zug::map([](const auto &item) {
	+ return std::get<0>(item);
	+ }))),
	+ parent
	+ )
	+ , m_readers(readers)
	+{
	+}
	+
	+MatrixEventReaderListModel::~MatrixEventReaderListModel() = default;
	+
	+MatrixEventReader *MatrixEventReaderListModel::at(int index) const
	+{
	+ auto reader = m_readers[index][lager::lenses::or_default].make();
	+ return new MatrixEventReader(
	+ reader.map([](const auto &r) {
	+ return std::get<0>(r);
	+ }),
	+ reader.map([](const auto &r) {
	+ return std::get<1>(r);
	+ }));
	+}
	diff --git a/src/matrix-event-reader-list-model.hpp b/src/matrix-event-reader-list-model.hpp
	new file mode 100644
	index 0000000..63f4a6e
	--- /dev/null
	+++ b/src/matrix-event-reader-list-model.hpp
	@@ -0,0 +1,29 @@
	+/*
	+ * This file is part of kazv.
	+ * SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	+ * SPDX-License-Identifier: AGPL-3.0-or-later
	+ */
	+
	+#pragma once
	+#include <libkazv-config.hpp>
	+
	+#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168
	+
	+#include "matrix-room-member-list-model.hpp"
	+
	+class MatrixEventReader;
	+
	+class MatrixEventReaderListModel : public MatrixRoomMemberListModel
	+{
	+ Q_OBJECT
	+ QML_ELEMENT
	+ QML_UNCREATABLE("")
	+
	+ lager::reader<immer::flex_vector<std::tuple<Kazv::Event, Kazv::Timestamp>>> m_readers;
	+
	+public:
	+ explicit MatrixEventReaderListModel(lager::reader<immer::flex_vector<std::tuple<Kazv::Event, Kazv::Timestamp>>> readers, QObject *parent = 0);
	+ ~MatrixEventReaderListModel() override;
	+
	+ Q_INVOKABLE MatrixEventReader *at(int index) const;
	+};
	diff --git a/src/matrix-event-reader.cpp b/src/matrix-event-reader.cpp
	new file mode 100644
	index 0000000..b3630d2
	--- /dev/null
	+++ b/src/matrix-event-reader.cpp
	@@ -0,0 +1,22 @@
	+/*
	+ * This file is part of kazv.
	+ * SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	+ * SPDX-License-Identifier: AGPL-3.0-or-later
	+ */
	+
	+#include <libkazv-config.hpp>
	+#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168
	+
	+#include "matrix-event-reader.hpp"
	+
	+using namespace Kazv;
	+
	+MatrixEventReader::MatrixEventReader(lager::reader<Kazv::Event> memberEvent, lager::reader<Kazv::Timestamp> timestamp, QObject *parent)
	+ : MatrixRoomMember(memberEvent, parent)
	+ , LAGER_QT(timestamp)(timestamp.map([](auto ts) {
	+ return static_cast<qint64>(ts);
	+ }))
	+{
	+}
	+
	+MatrixEventReader::~MatrixEventReader() = default;
	diff --git a/src/matrix-event-reader.hpp b/src/matrix-event-reader.hpp
	new file mode 100644
	index 0000000..1b80b69
	--- /dev/null
	+++ b/src/matrix-event-reader.hpp
	@@ -0,0 +1,25 @@
	+/*
	+ * This file is part of kazv.
	+ * SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	+ * SPDX-License-Identifier: AGPL-3.0-or-later
	+ */
	+
	+#pragma once
	+#include <libkazv-config.hpp>
	+
	+#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168
	+
	+#include "matrix-room-member.hpp"
	+
	+class MatrixEventReader : public MatrixRoomMember
	+{
	+ Q_OBJECT
	+ QML_ELEMENT
	+ QML_UNCREATABLE("")
	+
	+public:
	+ explicit MatrixEventReader(lager::reader<Kazv::Event> memberEvent, lager::reader<Kazv::Timestamp> timestamp, QObject *parent = 0);
	+ ~MatrixEventReader() override;
	+
	+ LAGER_QT_READER(qint64, timestamp);
	+};
	diff --git a/src/matrix-event.cpp b/src/matrix-event.cpp
	index 7a6c9a6..c5fa69a 100644
	--- a/src/matrix-event.cpp
	+++ b/src/matrix-event.cpp
	@@ -1,104 +1,136 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/
	#include <libkazv-config.hpp>

	#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168

	#include "matrix-event.hpp"
	+#include "matrix-event-reader-list-model.hpp"

	#include "helper.hpp"

	using namespace Kazv;

	static std::optional<LocalEchoDesc> getLocalEcho(std::variant<Event, LocalEchoDesc> event)
	{
	if (std::holds_alternative<LocalEchoDesc>(event)) {
	return std::get<LocalEchoDesc>(event);
	} else {
	return std::nullopt;
	}
	}

	static Event getEvent(std::variant<Event, LocalEchoDesc> event)
	{
	if (std::holds_alternative<LocalEchoDesc>(event)) {
	return std::get<LocalEchoDesc>(event).event;
	} else {
	return std::get<Event>(event);
	}
	}

	-MatrixEvent::MatrixEvent(lager::reader<std::variant<Event, LocalEchoDesc>> event, QObject *parent)
	+MatrixEvent::MatrixEvent(lager::reader<std::variant<Event, LocalEchoDesc>> event, std::optional<Room> room, QObject *parent)
	: QObject(parent)
	, m_localEcho(event.map(getLocalEcho))
	, m_event(event.map(getEvent))
	+ , m_room(room)
	, LAGER_QT(eventId)(m_event.xform(zug::map([](Event e) { return e.id(); }) \| strToQt))
	, LAGER_QT(sender)(m_event.xform(zug::map([](Event e) { return e.sender(); }) \| strToQt))
	, LAGER_QT(type)(m_event.xform(zug::map([](Event e) { return e.type(); }) \| strToQt))
	, LAGER_QT(stateKey)(m_event.xform(zug::map([](Event e) { return e.stateKey(); }) \| strToQt))
	, LAGER_QT(content)(m_event.xform(zug::map([](Event e) { return e.content().get().get<QJsonObject>(); })))
	, LAGER_QT(encrypted)(m_event.xform(zug::map([](Event e) { return e.encrypted(); })))
	, LAGER_QT(decrypted)(m_event.map([](Event e) { return e.decrypted(); }))
	, LAGER_QT(isState)(m_event.map([](Event e) { return e.isState(); }))
	, LAGER_QT(unsignedData)(m_event.map([](Event e) {
	auto j = e.raw();
	if (j.get().contains("unsigned")) {
	return j.get()["unsigned"].template get<QJsonObject>();
	} else {
	return QJsonObject();
	}
	}))
	, LAGER_QT(isLocalEcho)(m_localEcho.map([](const auto &maybe) { return maybe.has_value(); }))
	, LAGER_QT(isSending)(m_localEcho.map([](const auto &maybe) {
	return maybe.has_value() && maybe.value().status == LocalEchoDesc::Sending;
	}))
	, LAGER_QT(isFailed)(m_localEcho.map([](const auto &maybe) {
	return maybe.has_value() && maybe.value().status == LocalEchoDesc::Failed;
	}))
	, LAGER_QT(txnId)(m_localEcho.map([](const auto &maybe) {
	return maybe.has_value() ? QString::fromStdString(maybe.value().txnId) : QStringLiteral("");
	}))
	, LAGER_QT(redacted)(m_event.map([](const auto &e) {
	return e.redacted();
	}))
	, LAGER_QT(originalSource)(m_event.map([](Event e) {
	return e.originalJson().get().template get<QJsonObject>();
	}))
	, LAGER_QT(decryptedSource)(m_event.map([](Event e) {
	return e.decrypted() ? e.raw().get().template get<QJsonObject>() : QJsonObject();
	}))
	, LAGER_QT(replyingToEventId)(m_event.map([](Event e) {
	return e.replyingTo();
	}).xform(strToQt))
	, LAGER_QT(relationType)(m_event.map([](Event e) {
	return e.relationship().first;
	}).xform(strToQt))
	, LAGER_QT(relatedEventId)(m_event.map([](Event e) {
	return e.relationship().second;
	}).xform(strToQt))
	, LAGER_QT(formattedTime)(m_event
	.map(&Event::originServerTs)
	.map([](Timestamp ts) {
	auto locale = QLocale::system();
	return locale.toString(
	QDateTime::fromMSecsSinceEpoch(ts).time(),
	QLocale::ShortFormat
	);
	}))
	{
	}

	-MatrixEvent::MatrixEvent(lager::reader<Event> event, QObject *parent)
	- : MatrixEvent(event.map([](const auto &e) -> std::variant<Kazv::Event, Kazv::LocalEchoDesc> { return e; }), parent)
	+MatrixEvent::MatrixEvent(lager::reader<Event> event, std::optional<Kazv::Room> room, QObject *parent)
	+ : MatrixEvent(event.map([](const auto &e) -> std::variant<Kazv::Event, Kazv::LocalEchoDesc> { return e; }), room, parent)
	{
	}

	MatrixEvent::~MatrixEvent() = default;

	+MatrixEventReaderListModel *MatrixEvent::readers() const
	+{
	+ if (!m_room.has_value()) {
	+ return new MatrixEventReaderListModel(lager::make_constant(immer::flex_vector<std::tuple<Kazv::Event, Kazv::Timestamp>>{}));
	+ }
	+
	+ auto eventReaders = lager::with(
	+ m_room.value().eventReaders(m_event.map(&Event::id)),
	+ m_room.value().stateEvents()
	+ ).map([](const auto &eventReaders, const auto &states) {
	+ return intoImmer(
	+ immer::flex_vector<std::tuple<Kazv::Event, Kazv::Timestamp>>{},
	+ zug::map([states](const auto &item) -> std::tuple<Kazv::Event, Kazv::Timestamp> {
	+ auto [userId, ts] = item;
	+ auto memberEvent = states.count({"m.room.member", userId})
	+ ? states[{"m.room.member", userId}]
	+ : Event{json{
	+ {"content", json::object()},
	+ {"state_key", userId},
	+ {"type", "m.room.member"},
	+ }};
	+ return {memberEvent, ts};
	+ }),
	+ eventReaders
	+ );
	+ }).make();
	+
	+ return new MatrixEventReaderListModel(eventReaders);
	+}
	+
	Kazv::Event MatrixEvent::underlyingEvent() const
	{
	return m_event.get();
	}
	diff --git a/src/matrix-event.hpp b/src/matrix-event.hpp
	index 95573c3..8ac992d 100644
	--- a/src/matrix-event.hpp
	+++ b/src/matrix-event.hpp
	@@ -1,57 +1,62 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

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

	#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168

	#include <QObject>
	#include <QQmlEngine>

	#include <lager/extra/qt.hpp>

	#include <client/room/room.hpp>

	#include "qt-json.hpp"

	+class MatrixEventReaderListModel;
	+
	class MatrixEvent : public QObject
	{
	Q_OBJECT
	QML_ELEMENT
	QML_UNCREATABLE("")

	lager::reader<std::optional<Kazv::LocalEchoDesc>> m_localEcho;
	lager::reader<Kazv::Event> m_event;
	+ std::optional<Kazv::Room> m_room;

	public:
	- explicit MatrixEvent(lager::reader<std::variant<Kazv::Event, Kazv::LocalEchoDesc>> event, QObject *parent = 0);
	- explicit MatrixEvent(lager::reader<Kazv::Event> event, QObject *parent = 0);
	+ explicit MatrixEvent(lager::reader<std::variant<Kazv::Event, Kazv::LocalEchoDesc>> event, std::optional<Kazv::Room> room = std::nullopt, QObject *parent = 0);
	+ explicit MatrixEvent(lager::reader<Kazv::Event> event, std::optional<Kazv::Room> room = std::nullopt, QObject *parent = 0);
	~MatrixEvent() override;

	LAGER_QT_READER(QString, eventId);
	LAGER_QT_READER(QString, sender);
	LAGER_QT_READER(QString, type);
	LAGER_QT_READER(QString, stateKey);
	LAGER_QT_READER(QJsonObject, content);
	LAGER_QT_READER(bool, encrypted);
	LAGER_QT_READER(bool, decrypted);
	LAGER_QT_READER(bool, isState);
	LAGER_QT_READER(QJsonObject, unsignedData);
	LAGER_QT_READER(bool, isLocalEcho);
	LAGER_QT_READER(bool, isSending);
	LAGER_QT_READER(bool, isFailed);
	LAGER_QT_READER(QString, txnId);
	LAGER_QT_READER(bool, redacted);
	LAGER_QT_READER(QJsonObject, originalSource);
	LAGER_QT_READER(QJsonObject, decryptedSource);
	LAGER_QT_READER(QString, replyingToEventId);
	LAGER_QT_READER(QString, relationType);
	LAGER_QT_READER(QString, relatedEventId);
	LAGER_QT_READER(QString, formattedTime);

	+ MatrixEventReaderListModel *readers() const;
	+
	Kazv::Event underlyingEvent() const;
	};
	diff --git a/src/matrix-room-timeline.cpp b/src/matrix-room-timeline.cpp
	index 96afa3c..ea9c344 100644
	--- a/src/matrix-room-timeline.cpp
	+++ b/src/matrix-room-timeline.cpp
	@@ -1,104 +1,104 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/
	#include <libkazv-config.hpp>

	#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168

	#include <cmath>

	#include <lager/lenses/optional.hpp>

	#include <QTimer>

	#include <cursorutil.hpp>

	#include "matrix-room-timeline.hpp"
	#include "matrix-event.hpp"

	#include "helper.hpp"

	#include "kazv-log.hpp"

	using namespace Kazv;

	MatrixRoomTimeline::MatrixRoomTimeline(Kazv::Room room, QObject *parent)
	: QAbstractListModel(parent)
	, m_room(room)
	, m_timelineEventIds(m_room.timelineEventIds())
	, m_messagesMap(m_room.messagesMap())
	, m_internalCount(0)
	, m_localEchoes(m_room.localEchoes())
	, m_timelineGaps(m_room.timelineGaps())
	, LAGER_QT(count)(lager::with(
	m_timelineEventIds.xform(containerSize),
	m_localEchoes.xform(containerSize)
	).map([](const auto &tlSize, const auto &localSize) { return tlSize + localSize; }))
	, LAGER_QT(gaps)(m_timelineGaps.map([](auto g) {
	QSet<QString> res{};
	for (const auto &[k, _v] : g) {
	res.insert(QString::fromStdString(k));
	}
	return res;
	}))
	{
	connect(this, &MatrixRoomTimeline::countChanged, this, &MatrixRoomTimeline::updateInternalCount);
	// HACK: If internally the count is set to its full count at the beginning,
	// ListView will instantiate everything in the timeline.
	// I don't know why it is the case, so I keep the internal count as 0
	// when it is constructed, and update it in the next tick.
	QTimer::singleShot(0, this, [this] { Q_EMIT countChanged(count()); });
	}

	MatrixRoomTimeline::~MatrixRoomTimeline() = default;

	MatrixEvent *MatrixRoomTimeline::at(int index) const
	{
	return new MatrixEvent(lager::with(m_timelineEventIds, m_messagesMap, m_localEchoes, LAGER_QT(count))
	.map([index](const auto &tlEventIds, const auto &messagesMap, const auto &localEchoes, const auto &count) -> std::variant<Kazv::Event, Kazv::LocalEchoDesc> {
	auto rIndex = count - index - 1;
	if (static_cast<unsigned int>(rIndex) < tlEventIds.size()) {
	return messagesMap[tlEventIds[rIndex]];
	} else {
	auto remainingIndex = rIndex - tlEventIds.size();
	if (remainingIndex < localEchoes.size()) {
	return localEchoes[remainingIndex];
	} else {
	return Event();
	}
	}
	- }));
	+ }), m_room);
	}

	int MatrixRoomTimeline::rowCount(const QModelIndex &index) const
	{
	if (index.isValid()) {
	return 0;
	} else {
	return m_internalCount;
	}
	}

	QVariant MatrixRoomTimeline::data(const QModelIndex &, int) const
	{
	return QVariant();
	}

	void MatrixRoomTimeline::updateInternalCount()
	{
	auto curCount = count();
	auto oldCount = m_internalCount;
	auto diff = std::abs(curCount - oldCount);

	if (curCount > oldCount) {
	beginInsertRows(QModelIndex(), 0, diff - 1);
	m_internalCount = curCount;
	endInsertRows();
	} else if (curCount < oldCount) {
	beginRemoveRows(QModelIndex(), 0, diff - 1);
	m_internalCount = curCount;
	endRemoveRows();
	}
	}
	diff --git a/src/matrix-room.cpp b/src/matrix-room.cpp
	index 1ce5eb1..8eb48c4 100644
	--- a/src/matrix-room.cpp
	+++ b/src/matrix-room.cpp
	@@ -1,451 +1,452 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/
	#include <libkazv-config.hpp>

	#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168

	#include <lager/setter.hpp>
	#include <nlohmann/json.hpp>
	#include <event.hpp>

	#include <QFile>
	#include <QMimeDatabase>

	#include "kazv-log.hpp"
	#include "matrix-room.hpp"
	#include "matrix-room-timeline.hpp"
	#include "matrix-room-member.hpp"
	#include "matrix-room-member-list-model.hpp"
	#include "matrix-promise.hpp"
	#include "matrix-event.hpp"
	#include "kazv-markdown.hpp"

	#include "qfunctionutils.hpp"

	#include "helper.hpp"

	using namespace Kazv;

	static const int typingDebounceMs = 500;
	static const int saveDraftDebounceMs = 5000;
	static const int typingTimeoutMs = 1000;

	MatrixRoom::MatrixRoom(Kazv::Room room, lager::reader<std::string> selfUserId, QObject *parent)
	: QObject(parent)
	, m_room(room)
	, m_selfUserId(selfUserId)
	, m_memberNames(m_room.members())
	, m_powerLevels(m_room.powerLevels())
	, LAGER_QT(roomId)(m_room.roomId().xform(strToQt))
	, LAGER_QT(name)(m_room.nameOpt()[lager::lenses::or_default].xform(strToQt))
	, LAGER_QT(heroNames)(m_room.heroDisplayNames().xform(strListToQt))
	, LAGER_QT(avatarMxcUri)(m_room.avatarMxcUri().xform(strToQt))
	, LAGER_QT(roomOrHeroAvatarMxcUri)(lager::with(m_room.heroMemberEvents(), m_room.avatarMxcUri())
	.map([](const auto &heroes, const auto &roomAvatar) {
	if (!roomAvatar.empty()) {
	return roomAvatar;
	}
	if (heroes.size() == 1) {
	return zug::reduce(roomMemberToAvatar(zug::last), std::string(), heroes);
	}
	return std::string();
	})
	.xform(strToQt))
	, LAGER_QT(localDraft)(m_room.localDraft().xform(strToQt))
	, LAGER_QT(encrypted)(m_room.encrypted())
	, LAGER_QT(memberNames)(m_memberNames.xform(strListToQt))
	, LAGER_QT(tagIds)(m_room.tags().map([](const auto &tagsMap) {
	return zug::into(
	QStringList(),
	zug::map([](const auto pair) {
	return QString::fromStdString(pair.first);
	}),
	tagsMap);
	}))
	, LAGER_QT(membership)(m_room.membership().map([](const auto &membership) { return static_cast<Membership>(membership); }))
	, m_setTypingThrottled(QFunctionUtils::Throttle([self=QPointer<MatrixRoom>(this)]() {
	if (self) {
	self->setTypingImpl();
	}
	}, typingDebounceMs))
	, m_updateLocalDraftDebounced(QFunctionUtils::Debounce([self=QPointer<MatrixRoom>(this)]() {
	if (self) {
	self->updateLocalDraftNow();
	}
	}, saveDraftDebounceMs))
	, m_internalLocalDraft(std::nullopt)
	{
	lager::watch(m_powerLevels, [this](auto &&) {
	powerLevelsChanged();
	});
	}

	MatrixRoom::~MatrixRoom() {
	updateLocalDraftNow();
	}

	MatrixRoomTimeline *MatrixRoom::timeline() const
	{
	return new MatrixRoomTimeline(m_room);
	}

	static void maybeAddRelations(nlohmann::json &msg, const QString &replyTo)
	{
	if (!replyTo.isEmpty()) {
	msg["content"]["m.relates_to"] = nlohmann::json{
	{"m.in_reply_to", {
	{"event_id", replyTo},
	}},
	};
	}
	}

	static const std::string HTML_FORMAT = "org.matrix.custom.html";

	nlohmann::json makeTextMessageJson(const QString &text, const QString &replyTo, Event replyToEvent)
	{
	auto msg = nlohmann::json{
	{"type", "m.room.message"},
	{"content", {
	{"msgtype", "m.text"},
	{"body", text},
	}},
	};

	std::string replyToBody;
	if (!replyTo.isEmpty()) {
	auto replyToContent = replyToEvent.content().get();
	if (replyToContent.contains("format")
	&& replyToContent["format"] == HTML_FORMAT
	&& replyToContent.contains("formatted_body")
	&& replyToContent["formatted_body"].is_string()) {
	replyToBody = replyToContent["formatted_body"].template get<std::string>();
	auto replyPos = replyToBody.find("</mx-reply>");
	if (replyPos != std::string::npos) {
	replyToBody.erase(0, replyPos + std::string("</mx-reply>").size());
	}
	} else if (replyToContent.contains("body") && replyToContent["body"].is_string()) {
	replyToBody = markdownToHtml(replyToContent["body"].template get<std::string>()).html;
	}

	if (!replyToBody.empty()) {
	replyToBody = "<mx-reply><blockquote>" + replyToBody + "</blockquote></mx-reply>";
	}
	}
	auto richText = markdownToHtml(text.toStdString());
	msg["content"]["format"] = HTML_FORMAT;
	msg["content"]["formatted_body"] = replyToBody + richText.html;
	auto mentions = richText.mentions;
	if (!replyToEvent.sender().empty()
	&& std::find(mentions.begin(), mentions.end(), replyToEvent.sender()) == mentions.end()) {
	mentions = std::move(mentions).push_back(replyToEvent.sender());
	}

	if (!mentions.empty()) {
	msg["content"]["m.mentions"] = {
	{"user_ids", mentions},
	};
	}

	maybeAddRelations(msg, replyTo);
	return msg;
	}

	void MatrixRoom::sendMessage(const QJsonObject &eventJson, const QString &replyTo) const
	{
	auto msg = nlohmann::json(eventJson);
	maybeAddRelations(msg, replyTo);
	m_room.sendMessage(Event(msg));
	}

	void MatrixRoom::sendTextMessage(QString text, QString replyTo) const
	{
	Event replyToEvent = replyTo.isEmpty()
	? Event()
	: m_room.message(lager::make_constant(replyTo.toStdString())).make().get();
	auto j = makeTextMessageJson(text, replyTo, replyToEvent);
	m_room.sendMessage(Event(j));
	}

	void MatrixRoom::sendMediaFileMessage(QString fileName, QString mimeType, qint64 fileSize, QString mxcUri) const
	{
	auto j = makeMediaFileMessageJson(fileName, mimeType, fileSize, mxcUri);
	Kazv::Event e{j};
	m_room.sendMessage(e);
	}

	void MatrixRoom::sendEncryptedFileMessage(const QString &fileName, const QString &mimeType,
	const qint64 fileSize, const QString &mxcUri,
	const QString &key, const QString &iv, const QByteArray &hash) const
	{
	auto j = makeEncryptedFileMessageJson(fileName, mimeType, fileSize, mxcUri, key, iv, hash);
	Kazv::Event e{j};
	m_room.sendMessage(e);
	}

	static nlohmann::json makeReactionJson(QString text, QString relatedTo)
	{
	auto msg = nlohmann::json{
	{"type", "m.reaction"},
	{"content", {
	{"m.relates_to", {
	{"rel_type", "m.annotation"},
	{"event_id", relatedTo.toStdString()},
	{"key", text.toStdString()},
	}},
	}},
	};

	return msg;
	}

	void MatrixRoom::sendReaction(QString text, QString relatedTo) const
	{
	auto j = makeReactionJson(text, relatedTo);
	m_room.sendMessage(Event(j));
	}

	void MatrixRoom::resendMessage(QString txnId) const
	{
	m_room.resendMessage(txnId.toStdString());
	}

	nlohmann::json MatrixRoom::makeMediaFileMessageJson(QString fileName, QString mimeType, qint64 fileSize, QString mxcUri) const
	{
	static auto available_msgtype = std::array<std::string, 3>{"m.audio", "m.video", "m.image"};
	auto try_msgtype = std::find(available_msgtype.begin(), available_msgtype.end(),
	QStringLiteral("m.").append(mimeType.split(QChar('/'))[0]).toStdString());
	std::string msgtype;
	if (try_msgtype == available_msgtype.end()) {
	msgtype = "m.file";
	} else {
	msgtype = *try_msgtype;
	}
	return nlohmann::json {
	{"type", "m.room.message"},
	{"content", {
	{"msgtype", msgtype},
	{"body", fileName.toStdString()},
	{"url", mxcUri.toStdString()},
	{"info", {
	{"size", fileSize},
	{"mimetype", mimeType.toStdString()}
	}}
	}}
	};
	}

	nlohmann::json MatrixRoom::makeEncryptedFileMessageJson(const QString &fileName, const QString &mimeType,
	const qint64 fileSize, const QString &mxcUri,
	const QString &key, const QString &iv, const QByteArray &hash) const
	{
	static auto available_msgtype = std::array<std::string, 3>{"m.audio", "m.video", "m.image"};
	auto try_msgtype = std::find(available_msgtype.begin(), available_msgtype.end(),
	QStringLiteral("m.").append(mimeType.split(QChar('/'))[0]).toStdString());
	std::string msgtype;
	if (try_msgtype == available_msgtype.end()) {
	msgtype = "m.file";
	} else {
	msgtype = *try_msgtype;
	}
	return nlohmann::json {
	{"type", "m.room.message"},
	{"content", {
	{"msgtype", msgtype},
	{"body", fileName.toStdString()},
	{"file", {
	{"url", mxcUri.toStdString()},
	{"key", {
	{"kty", "oct"},
	{"key_ops", nlohmann::json::array({"encrypt", "decrypt"})},
	{"alg", "A256CTR"},
	{"k", key.toStdString()},
	{"ext", true}
	}},
	{"iv", iv.toStdString()},
	{"hashes", {
	{"sha256", hash.toStdString()}
	}},
	{"v", "v2"}
	}},
	{"info", {
	{"size", fileSize},
	{"mimetype", mimeType.toStdString()}
	}}
	}}
	};
	}

	MatrixPromise *MatrixRoom::redactEvent(QString eventId, QString reason) const
	{
	qCInfo(kazvLog) << "redactEvent(" << eventId << ", " << reason << ")";
	return new MatrixPromise(m_room.redactEvent(
	eventId.toStdString(),
	reason.isEmpty() ? std::nullopt : std::optional<std::string>(reason.toStdString())
	));
	}

	MatrixPromise *MatrixRoom::removeLocalEcho(QString txnId) const
	{
	return new MatrixPromise(m_room.removeLocalEcho(txnId.toStdString()));
	}

	MatrixPromise *MatrixRoom::addOrSetTag(QString tagId) const
	{
	return new MatrixPromise(m_room.addOrSetTag(tagId.toStdString()));
	}

	MatrixPromise *MatrixRoom::removeTag(QString tagId) const
	{
	return new MatrixPromise(m_room.removeTag(tagId.toStdString()));
	}

	MatrixPromise *MatrixRoom::paginateBackFrom(QString eventId) const
	{
	return new MatrixPromise(m_room.paginateBackFromEvent(eventId.toStdString()));
	}

	MatrixPromise *MatrixRoom::leaveRoom() const
	{
	return new MatrixPromise(m_room.leave());
	}

	MatrixRoomMember *MatrixRoom::memberAt(int index) const
	{
	return new MatrixRoomMember(m_room.memberEventByCursor(
	m_memberNames[index][lager::lenses::or_default]));
	}

	MatrixRoomMember *MatrixRoom::member(QString userId) const
	{
	return new MatrixRoomMember(m_room.memberEventFor(userId.toStdString()));
	}

	MatrixEvent *MatrixRoom::messageById(QString eventId) const
	{
	return new MatrixEvent(
	m_room.message(lager::make_constant(eventId.toStdString()))
	- .map([](const auto &e) -> std::variant<Kazv::Event, Kazv::LocalEchoDesc> { return e; })
	+ .map([](const auto &e) -> std::variant<Kazv::Event, Kazv::LocalEchoDesc> { return e; }),
	+ m_room
	);
	}

	MatrixRoomMemberListModel *MatrixRoom::typingUsers() const
	{
	return new MatrixRoomMemberListModel(
	m_room.typingMemberEvents()
	.xform(containerMap(EventList{}, zug::filter([self=m_selfUserId.make().get()](const auto &e) {
	return e.stateKey() != self;
	})))
	);
	}

	void MatrixRoom::setTyping(bool typing)
	{
	if (typing) {
	m_setTypingThrottled();
	} else {
	m_room.setTyping(false, std::nullopt);
	}
	}

	void MatrixRoom::setTypingImpl()
	{
	m_room.setTyping(true, typingTimeoutMs);
	}

	void MatrixRoom::setLocalDraft(QString localDraft)
	{
	// To avoid heavy computations when updating the local draft again
	// and again, we only set our internal state. **Assume only
	// one MatrixRoom can deal with the local draft** at the same time,
	// it is safe to update it debounced and when we are destructed.
	// See also the destructor.
	m_internalLocalDraft = localDraft;
	m_updateLocalDraftDebounced();
	}

	void MatrixRoom::updateLocalDraftNow()
	{
	if (m_internalLocalDraft.has_value()) {
	m_room.setLocalDraft(m_internalLocalDraft.value().toStdString());
	m_internalLocalDraft = std::nullopt;
	}
	}

	MatrixRoomMemberListModel *MatrixRoom::members() const
	{
	return new MatrixRoomMemberListModel(
	m_room.joinedMemberEvents()
	);
	}

	MatrixRoomMemberListModel *MatrixRoom::bannedMembers() const
	{
	return new MatrixRoomMemberListModel(
	m_room.bannedMemberEvents()
	);
	}

	qint64 MatrixRoom::userPowerLevel(const QString &userId) const
	{
	auto e = m_powerLevels.get().normalizedEvent().content().get();
	auto userIdStd = userId.toStdString();
	return e.at("users").contains(userIdStd)
	? e.at("users")[userIdStd].template get<Kazv::PowerLevel>()
	: e.at("users_default").template get<Kazv::PowerLevel>();
	}

	MatrixPromise *MatrixRoom::setUserPowerLevel(const QString &userId, qint64 powerLevel) const
	{
	auto next = m_powerLevels.get().setUser(userId.toStdString(), powerLevel);
	return new MatrixPromise(m_room.sendStateEvent(next.originalEvent()));
	}

	MatrixPromise *MatrixRoom::unsetUserPowerLevel(const QString &userId) const
	{
	auto next = m_powerLevels.get().setUser(userId.toStdString(), std::nullopt);
	return new MatrixPromise(m_room.sendStateEvent(next.originalEvent()));
	}

	MatrixPromise *MatrixRoom::getStateEvent(const QString &type, const QString &stateKey) const
	{
	return new MatrixPromise(m_room.getStateEvent(
	type.toStdString(), stateKey.toStdString()
	));
	}

	MatrixPromise *MatrixRoom::ensureStateEvent(const QString &type, const QString &stateKey) const
	{
	if (m_room
	.stateOpt({type.toStdString(), stateKey.toStdString()})
	.make()
	.get()
	.has_value()) {
	return MatrixPromise::createResolved(true, QJsonObject());
	} else {
	return getStateEvent(type, stateKey);
	}
	}

	MatrixPromise *MatrixRoom::kickUser(const QString &userId, const QString &reason) const
	{
	return new MatrixPromise(m_room.kick(userId.toStdString(), reason.toStdString()));
	}

	MatrixPromise *MatrixRoom::banUser(const QString &userId, const QString &reason) const
	{
	return new MatrixPromise(m_room.ban(userId.toStdString(), reason.toStdString()));
	}

	MatrixPromise *MatrixRoom::unbanUser(const QString &userId) const
	{
	return new MatrixPromise(m_room.unban(userId.toStdString()));
	}

	MatrixPromise *MatrixRoom::inviteUser(const QString &userId) const
	{
	return new MatrixPromise(m_room.invite(userId.toStdString()));
	}
	diff --git a/src/tests/matrix-room-timeline-test.cpp b/src/tests/matrix-room-timeline-test.cpp
	index cd11449..c77fc59 100644
	--- a/src/tests/matrix-room-timeline-test.cpp
	+++ b/src/tests/matrix-room-timeline-test.cpp
	@@ -1,56 +1,96 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <libkazv-config.hpp>
	#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168

	#include <memory>

	#include <QtTest>

	+#include <factory.hpp>
	+
	#include <matrix-room-timeline.hpp>
	#include <matrix-sdk.hpp>
	#include <matrix-room-list.hpp>
	#include <matrix-room.hpp>
	#include <matrix-event.hpp>
	+#include <matrix-event-reader-list-model.hpp>
	+#include <matrix-event-reader.hpp>

	#include "test-model.hpp"
	#include "test-utils.hpp"

	using namespace Kazv;
	+using namespace Kazv::Factory;

	class MatrixRoomTimelineTest : public QObject
	{
	Q_OBJECT

	private Q_SLOTS:
	void testLocalEcho();
	+ void testReadReceipts();
	};

	void MatrixRoomTimelineTest::testLocalEcho()
	{
	auto model = makeTestModel();
	std::unique_ptr<MatrixSdk> sdk{makeTestSdk(model)};
	auto roomList = toUniquePtr(sdk->roomList());
	auto room = toUniquePtr(roomList->room("!foo:tusooa.xyz"));
	auto timeline = toUniquePtr(room->timeline());

	QCOMPARE(timeline->count(), 2);
	auto first = toUniquePtr(timeline->at(1)); // reverse order
	QCOMPARE(first->isSending(), true);
	QCOMPARE(first->isLocalEcho(), true);
	QCOMPARE(first->isFailed(), false);
	QCOMPARE(first->txnId(), "some-txn-id");
	auto second = toUniquePtr(timeline->at(0));
	QCOMPARE(second->isSending(), false);
	QCOMPARE(second->isLocalEcho(), true);
	QCOMPARE(second->isFailed(), true);
	QCOMPARE(second->txnId(), "some-other-txn-id");
	}

	+void MatrixRoomTimelineTest::testReadReceipts()
	+{
	+ auto r = makeRoom(withRoomTimeline({
	+ makeEvent(withEventId("$1")),
	+ makeEvent(withEventId("$2")),
	+ }));
	+ r.eventReadUsers = {{"$1", {"@a:example.com", "@b:example.com"}}};
	+ r.readReceipts = {{"@a:example.com", {"$1", 1234}}, {"@b:example.com", {"$2", 5678}}};
	+ auto model = SdkModel{makeClient(withRoom(r))};
	+ std::unique_ptr<MatrixSdk> sdk{makeTestSdk(model)};
	+ auto roomList = toUniquePtr(sdk->roomList());
	+ auto room = toUniquePtr(roomList->room(QString::fromStdString(r.roomId)));
	+ auto timeline = toUniquePtr(room->timeline());
	+ {
	+ auto event = toUniquePtr(timeline->at(1));
	+ QCOMPARE(event->eventId(), "$1");
	+ auto readers = toUniquePtr(event->readers());
	+ QCOMPARE(readers->count(), 2);
	+ auto reader1 = toUniquePtr(readers->at(0));
	+ QCOMPARE(reader1->userId(), "@a:example.com");
	+ QCOMPARE(reader1->timestamp(), 1234);
	+ auto reader2 = toUniquePtr(readers->at(1));
	+ QCOMPARE(reader2->userId(), "@b:example.com");
	+ QCOMPARE(reader2->timestamp(), 5678);
	+ }
	+
	+ {
	+ auto event = toUniquePtr(timeline->at(0));
	+ QCOMPARE(event->eventId(), "$2");
	+ auto readers = toUniquePtr(event->readers());
	+ QCOMPARE(readers->count(), 0);
	+ }
	+}
	+
	QTEST_MAIN(MatrixRoomTimelineTest)

	#include "matrix-room-timeline-test.moc"

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