sync.cpp
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	/*
	* Copyright (C) 2020 Tusooa Zhu
	*
	* This file is part of libkazv.
	*
	* libkazv is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* libkazv is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
	*/


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

	#include <csapi/sync.hpp>
	#include <jobinterface.hpp>
	#include <debug.hpp>

	#include "cursorutil.hpp"

	#include "sync.hpp"

	static const int syncInterval = 2000; // ms

	namespace Kazv
	{
	// Atomicity guaranteed: if the sync action is created
	// before an action that reasonably changes Client
	// (e.g. roll back to an earlier state, obtain other
	// events), but executed
	// after that action, the sync will still give continuous
	// data about the events. (Sync will not "skip" events)
	// This is because this function takes the sync token
	// from the Client model it is passed.
	ClientResult updateClient(Client m, SyncAction)
	{
	return {
	m,
	[=](auto &&ctx) {
	dbgClient << "Start syncing with token " << m.syncToken << std::endl;
	SyncJob job(m.serverUrl,
	m.token,
	{}, // filter
	m.syncToken);
	auto &jobHandler = lager::get<JobInterface &>(ctx);
	jobHandler.fetch(
	job,
	[=](BaseJob::Response r) {
	if (!SyncJob::success(r)) {
	dbgClient << "Sync failed" << std::endl;
	dbgClient << r.statusCode << std::endl;
	if (BaseJob::isBodyJson(r.body)) {
	auto j = jsonBody(r);
	dbgClient << "Json says: " << j.get().dump() << std::endl;
	} else {
	dbgClient << "Response body: "
	<< std::get<BaseJob::BytesBody>(r.body) << std::endl;
	}
	return;
	}
	dbgClient << "Sync successful" << std::endl;

	auto rooms = SyncJob::rooms(r);
	auto accountData = SyncJob::accountData(r);
	auto presence = SyncJob::presence(r);
	// load the info that has been sync'd

	ctx.dispatch(
	LoadSyncResultAction{
	SyncJob::nextBatch(r),
	rooms,
	presence,
	accountData,
	SyncJob::toDevice(r),
	SyncJob::deviceLists(r),
	SyncJob::deviceOneTimeKeysCount(r),
	});

	// kick off next sync
	auto &jobHandler = lager::get<JobInterface &>(ctx);
	jobHandler.setTimeout(
	[=]() {
	ctx.dispatch(SyncAction{});
	}, syncInterval);
	});
	}
	};
	}


	static KazvEventList loadRoomsFromSyncInPlace(Client &m, SyncJob::Rooms rooms)
	{
	auto l = m.roomList;
	auto eventsToEmit = KazvEventList{};

	auto updateRoomImpl =
	[&l](auto id, auto a) {
	l = RoomList::update(
	std::move(l),
	RoomList::UpdateRoomAction{id, a});
	};
	auto updateSingleRoom =
	[&, updateRoomImpl](auto id, auto room, auto membership) {
	if (!l.has(id) \|\| l[id].membership != membership) {
	eventsToEmit = eventsToEmit.push_back(RoomMembershipChanged{membership, id});
	}
	updateRoomImpl(id, Room::ChangeMembershipAction{membership});
	eventsToEmit = std::move(eventsToEmit) + intoImmer(
	KazvEventList{},
	zug::map([=](Event e) -> KazvEvent { return ReceivingRoomTimelineEvent{e, id}; }),
	room.timeline.events);
	updateRoomImpl(id, Room::AppendTimelineAction{room.timeline.events});
	if (room.state) {
	eventsToEmit = std::move(eventsToEmit) + intoImmer(
	KazvEventList{},
	zug::map([=](Event e) -> KazvEvent { return ReceivingRoomStateEvent{e, id}; }),
	room.state.value().events);
	updateRoomImpl(id, Room::AddStateEventsAction{room.state.value().events});
	}
	if (room.accountData) {
	eventsToEmit = std::move(eventsToEmit) + intoImmer(
	KazvEventList{},
	zug::map([=](Event e) -> KazvEvent { return ReceivingRoomAccountDataEvent{e, id}; }),
	room.state.value().events);
	updateRoomImpl(id, Room::AddAccountDataAction{room.accountData.value().events});
	}
	};

	auto updateJoinedRoom =
	[=](auto id, auto room) {
	updateSingleRoom(id, room, Room::Membership::Join);
	};

	auto updateInvitedRoom =
	[=](auto id, auto room) {
	updateRoomImpl(id, Room::ChangeMembershipAction{Room::Membership::Invite});
	if (room.inviteState) {
	updateRoomImpl(id, Room::ChangeInviteStateAction{room.inviteState.value().events});
	}
	};

	auto updateLeftRoom =
	[=](auto id, auto room) {
	updateSingleRoom(id, room, Room::Membership::Leave);
	};

	for (auto &&[id, room]: rooms.join) {
	updateJoinedRoom(id, room);
	// TODO update other info such as
	// ephemeral, notification and summary
	}

	// TODO update info for invited rooms
	for (auto &&[id, room]: rooms.invite) {
	updateInvitedRoom(id, room);
	}

	for (auto &&[id, room]: rooms.leave) {
	updateLeftRoom(id, room);
	}

	m.roomList = l;
	return eventsToEmit;
	}

	static KazvEventList loadPresenceFromSyncInPlace(Client &m, EventList presence)
	{
	auto eventsToEmit = intoImmer(
	KazvEventList{},
	zug::map([](Event e) { return ReceivingPresenceEvent{e}; }),
	presence);
	m.presence = merge(std::move(m.presence), presence, keyOfPresence);
	return eventsToEmit;
	}

	static KazvEventList loadAccountDataFromSyncInPlace(Client &m, EventList accountData)
	{
	auto eventsToEmit = intoImmer(
	KazvEventList{},
	zug::map([](Event e) { return ReceivingPresenceEvent{e}; }),
	accountData);
	m.accountData = merge(std::move(m.accountData), accountData, keyOfAccountData);
	return eventsToEmit;
	}

	ClientResult updateClient(Client m, LoadSyncResultAction a)
	{
	auto eventsToEmit = KazvEventList{};
	m.syncToken = a.syncToken;
	if (a.rooms) {
	eventsToEmit = std::move(eventsToEmit) + loadRoomsFromSyncInPlace(m, a.rooms.value());
	}

	if (a.presence) {
	eventsToEmit = std::move(eventsToEmit) + loadPresenceFromSyncInPlace(m, a.presence.value().events);
	}

	if (a.accountData) {
	eventsToEmit = std::move(eventsToEmit) + loadAccountDataFromSyncInPlace(m, a.accountData.value().events);
	}

	auto eventAction = EmitKazvEventsAction{eventsToEmit};

	return {
	std::move(m),
	[=](auto &&ctx) {
	ctx.dispatch(eventAction);
	}
	};
	}

	Client::Result updateClient(Client m, EmitKazvEventsAction a)
	{
	return { std::move(m),
	[=](auto &&ctx) {
	auto &eventEmitter = lager::get<EventInterface &>(ctx);
	for (auto ev: a.events) {
	eventEmitter.emit(ev);
	}
	}
	};
	}
	}

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