room.hpp
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room.hpp
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	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

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

	#include <lager/reader.hpp>
	#include <lager/context.hpp>
	#include <lager/with.hpp>
	#include <lager/constant.hpp>
	#include <lager/lenses/optional.hpp>
	#include <zug/transducer/map.hpp>
	#include <zug/transducer/filter.hpp>
	#include <zug/sequence.hpp>
	#include <immer/flex_vector_transient.hpp>

	#include "debug.hpp"

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

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

	struct InEventLoopTag {};

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

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

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

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

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

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

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

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

	/**
	* Get the timeline event ids of this room in ascending timestamp order.
	* It takes constant time for the cursor to be updated.
	*
	* @return A lager::reader of a RangeT of event ids.
	*/
	auto timelineEventIds() const -> lager::reader<immer::flex_vector<std::string>>;

	/**
	* Get a map from event ids to events. It takes constant time for the
	* cursor to be updated.
	*
	* @return A lager::reader of a map for all timeline events.
	*/
	auto messagesMap() const -> lager::reader<immer::map<std::string, Event>>;

	/**
	* Get a list of timeline events in this room. It takes O(timeline.size())
	* time for the cursor to be updated.
	*
	* @return A lager::reader<RangeT<Event>> of timeline events from
	* the oldest to the latest.
	*/
	auto timelineEvents() const -> lager::reader<immer::flex_vector<Event>>;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	/**
	* Set the account data for this room.
	*
	* @return A Promise that resolves when the account data
	* has been set, or when there is an error.
	*/
	PromiseT setAccountData(Event accountDataEvent) const;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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