/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "api/api_updates.h"

#include "api/api_text_entities.h"
#include "main/main_session.h"
#include "main/main_account.h"
#include "mtproto/mtp_instance.h"
#include "mtproto/mtproto_config.h"
#include "mtproto/mtproto_dc_options.h"
#include "data/stickers/data_stickers.h"
#include "data/data_session.h"
#include "data/data_user.h"
#include "data/data_chat.h"
#include "data/data_changes.h"
#include "data/data_channel.h"
#include "data/data_chat_filters.h"
#include "data/data_cloud_themes.h"
#include "data/data_drafts.h"
#include "data/data_histories.h"
#include "data/data_folder.h"
#include "data/data_scheduled_messages.h"
#include "lang/lang_cloud_manager.h"
#include "history/history.h"
#include "history/history_item.h"
#include "core/application.h"
#include "storage/storage_account.h"
#include "storage/storage_facade.h"
#include "storage/storage_user_photos.h"
#include "storage/storage_shared_media.h"
#include "calls/calls_instance.h"
#include "base/unixtime.h"
#include "window/window_session_controller.h"
#include "window/window_controller.h"
#include "boxes/confirm_box.h"
#include "apiwrap.h"
#include "app.h" // App::formatPhone

namespace Api {
namespace {

constexpr auto kChannelGetDifferenceLimit = 100;

// 1s wait after show channel history before sending getChannelDifference.
constexpr auto kWaitForChannelGetDifference = crl::time(1000);

// If nothing is received in 1 min we ping.
constexpr auto kNoUpdatesTimeout = 60 * 1000;

// If nothing is received in 1 min when was a sleepmode we ping.
constexpr auto kNoUpdatesAfterSleepTimeout = 60 * crl::time(1000);

enum class DataIsLoadedResult {
	NotLoaded = 0,
	FromNotLoaded = 1,
	MentionNotLoaded = 2,
	Ok = 3,
};

bool IsForceLogoutNotification(const MTPDupdateServiceNotification &data) {
	return qs(data.vtype()).startsWith(qstr("AUTH_KEY_DROP_"));
}

bool HasForceLogoutNotification(const MTPUpdates &updates) {
	const auto checkUpdate = [](const MTPUpdate &update) {
		if (update.type() != mtpc_updateServiceNotification) {
			return false;
		}
		return IsForceLogoutNotification(
			update.c_updateServiceNotification());
	};
	const auto checkVector = [&](const MTPVector<MTPUpdate> &list) {
		for (const auto &update : list.v) {
			if (checkUpdate(update)) {
				return true;
			}
		}
		return false;
	};
	switch (updates.type()) {
	case mtpc_updates:
		return checkVector(updates.c_updates().vupdates());
	case mtpc_updatesCombined:
		return checkVector(updates.c_updatesCombined().vupdates());
	case mtpc_updateShort:
		return checkUpdate(updates.c_updateShort().vupdate());
	}
	return false;
}

bool ForwardedInfoDataLoaded(
		not_null<Main::Session*> session,
		const MTPMessageFwdHeader &header) {
	return header.match([&](const MTPDmessageFwdHeader &data) {
		if (const auto fromId = data.vfrom_id()) {
			// Fully loaded is required in this case.
			if (!session->data().peerLoaded(peerFromMTP(*fromId))) {
				return false;
			}
		}
		return true;
	});
}

bool MentionUsersLoaded(
		not_null<Main::Session*> session,
		const MTPVector<MTPMessageEntity> &entities) {
	for (const auto &entity : entities.v) {
		auto type = entity.type();
		if (type == mtpc_messageEntityMentionName) {
			if (!session->data().userLoaded(entity.c_messageEntityMentionName().vuser_id().v)) {
				return false;
			}
		} else if (type == mtpc_inputMessageEntityMentionName) {
			auto &inputUser = entity.c_inputMessageEntityMentionName().vuser_id();
			if (inputUser.type() == mtpc_inputUser) {
				if (!session->data().userLoaded(inputUser.c_inputUser().vuser_id().v)) {
					return false;
				}
			}
		}
	}
	return true;
}

DataIsLoadedResult AllDataLoadedForMessage(
		not_null<Main::Session*> session,
		const MTPMessage &message) {
	return message.match([&](const MTPDmessage &message) {
		if (const auto fromId = message.vfrom_id()) {
			if (!message.is_post()
				&& !session->data().peerLoaded(peerFromMTP(*fromId))) {
				return DataIsLoadedResult::FromNotLoaded;
			}
		}
		if (const auto viaBotId = message.vvia_bot_id()) {
			if (!session->data().userLoaded(viaBotId->v)) {
				return DataIsLoadedResult::NotLoaded;
			}
		}
		if (const auto fwd = message.vfwd_from()) {
			if (!ForwardedInfoDataLoaded(session, *fwd)) {
				return DataIsLoadedResult::NotLoaded;
			}
		}
		if (const auto entities = message.ventities()) {
			if (!MentionUsersLoaded(session, *entities)) {
				return DataIsLoadedResult::MentionNotLoaded;
			}
		}
		return DataIsLoadedResult::Ok;
	}, [&](const MTPDmessageService &message) {
		if (const auto fromId = message.vfrom_id()) {
			if (!message.is_post()
				&& !session->data().peerLoaded(peerFromMTP(*fromId))) {
				return DataIsLoadedResult::FromNotLoaded;
			}
		}
		return message.vaction().match(
		[&](const MTPDmessageActionChatAddUser &action) {
			for (const MTPint &userId : action.vusers().v) {
				if (!session->data().userLoaded(userId.v)) {
					return DataIsLoadedResult::NotLoaded;
				}
			}
			return DataIsLoadedResult::Ok;
		}, [&](const MTPDmessageActionChatJoinedByLink &action) {
			if (!session->data().userLoaded(action.vinviter_id().v)) {
				return DataIsLoadedResult::NotLoaded;
			}
			return DataIsLoadedResult::Ok;
		}, [&](const MTPDmessageActionChatDeleteUser &action) {
			if (!session->data().userLoaded(action.vuser_id().v)) {
				return DataIsLoadedResult::NotLoaded;
			}
			return DataIsLoadedResult::Ok;
		}, [](const auto &) {
			return DataIsLoadedResult::Ok;
		});
	}, [](const MTPDmessageEmpty &message) {
		return DataIsLoadedResult::Ok;
	});
}

} // namespace

Updates::Updates(not_null<Main::Session*> session)
: _session(session)
, _noUpdatesTimer([=] { sendPing(); })
, _onlineTimer([=] { updateOnline(); })
, _ptsWaiter(this)
, _byPtsTimer([=] { getDifferenceByPts(); })
, _bySeqTimer([=] { getDifference(); })
, _byMinChannelTimer([=] { getDifference(); })
, _failDifferenceTimer([=] { getDifferenceAfterFail(); })
, _idleFinishTimer([=] { checkIdleFinish(); }) {
	_ptsWaiter.setRequesting(true);

	session->account().mtpUpdates(
	) | rpl::start_with_next([=](const MTPUpdates &updates) {
		mtpUpdateReceived(updates);
	}, _lifetime);

	session->account().mtpNewSessionCreated(
	) | rpl::start_with_next([=] {
		mtpNewSessionCreated();
	}, _lifetime);

	api().request(MTPupdates_GetState(
	)).done([=](const MTPupdates_State &result) {
		stateDone(result);
	}).send();
}

Main::Session &Updates::session() const {
	return *_session;
}

ApiWrap &Updates::api() const {
	return _session->api();
}

void Updates::checkLastUpdate(bool afterSleep) {
	const auto now = crl::now();
	const auto skip = afterSleep
		? kNoUpdatesAfterSleepTimeout
		: kNoUpdatesTimeout;
	if (_lastUpdateTime && now > _lastUpdateTime + skip) {
		_lastUpdateTime = now;
		sendPing();
	}
}

void Updates::feedUpdateVector(
		const MTPVector<MTPUpdate> &updates,
		bool skipMessageIds) {
	for (const auto &update : updates.v) {
		if (skipMessageIds && update.type() == mtpc_updateMessageID) {
			continue;
		}
		feedUpdate(update);
	}
	session().data().sendHistoryChangeNotifications();
}

void Updates::feedMessageIds(const MTPVector<MTPUpdate> &updates) {
	for (const auto &update : updates.v) {
		if (update.type() == mtpc_updateMessageID) {
			feedUpdate(update);
		}
	}
}

void Updates::setState(int32 pts, int32 date, int32 qts, int32 seq) {
	if (pts) {
		_ptsWaiter.init(pts);
	}
	if (_updatesDate < date && !_byMinChannelTimer.isActive()) {
		_updatesDate = date;
	}
	if (qts && _updatesQts < qts) {
		_updatesQts = qts;
	}
	if (seq && seq != _updatesSeq) {
		_updatesSeq = seq;
		if (_bySeqTimer.isActive()) {
			_bySeqTimer.cancel();
		}
		while (!_bySeqUpdates.empty()) {
			const auto s = _bySeqUpdates.front().first;
			if (s <= seq + 1) {
				const auto v = _bySeqUpdates.front().second;
				_bySeqUpdates.erase(_bySeqUpdates.begin());
				if (s == seq + 1) {
					return applyUpdates(v);
				}
			} else {
				if (!_bySeqTimer.isActive()) {
					_bySeqTimer.callOnce(PtsWaiter::kWaitForSkippedTimeout);
				}
				break;
			}
		}
	}
}

void Updates::channelDifferenceDone(
		not_null<ChannelData*> channel,
		const MTPupdates_ChannelDifference &difference) {
	_channelFailDifferenceTimeout.remove(channel);

	const auto timeout = difference.match([&](const auto &data) {
		return data.vtimeout().value_or_empty();
	});
	const auto isFinal = difference.match([&](const auto &data) {
		return data.is_final();
	});
	difference.match([&](const MTPDupdates_channelDifferenceEmpty &data) {
		channel->ptsInit(data.vpts().v);
	}, [&](const MTPDupdates_channelDifferenceTooLong &data) {
		session().data().processUsers(data.vusers());
		session().data().processChats(data.vchats());
		const auto history = session().data().historyLoaded(channel->id);
		if (history) {
			history->setNotLoadedAtBottom();
			requestChannelRangeDifference(history);
		}
		data.vdialog().match([&](const MTPDdialog &data) {
			if (const auto pts = data.vpts()) {
				channel->ptsInit(pts->v);
			}
		}, [&](const MTPDdialogFolder &) {
		});
		session().data().applyDialogs(
			nullptr,
			data.vmessages().v,
			QVector<MTPDialog>(1, data.vdialog()));
		session().data().channelDifferenceTooLong(channel);
	}, [&](const MTPDupdates_channelDifference &data) {
		feedChannelDifference(data);
		channel->ptsInit(data.vpts().v);
	});

	channel->ptsSetRequesting(false);

	if (!isFinal) {
		MTP_LOG(0, ("getChannelDifference "
			"{ good - after not final channelDifference was received }%1"
			).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));
		getChannelDifference(channel);
	} else if (ranges::contains(
			_activeChats,
			channel,
			[](const auto &pair) { return pair.second.peer; })) {
		channel->ptsWaitingForShortPoll(timeout
			? (timeout * crl::time(1000))
			: kWaitForChannelGetDifference);
	}
}

void Updates::feedChannelDifference(
		const MTPDupdates_channelDifference &data) {
	session().data().processUsers(data.vusers());
	session().data().processChats(data.vchats());

	_handlingChannelDifference = true;
	feedMessageIds(data.vother_updates());
	session().data().processMessages(
		data.vnew_messages(),
		NewMessageType::Unread);
	feedUpdateVector(data.vother_updates(), true);
	_handlingChannelDifference = false;
}

void Updates::channelDifferenceFail(
		not_null<ChannelData*> channel,
		const RPCError &error) {
	LOG(("RPC Error in getChannelDifference: %1 %2: %3"
		).arg(error.code()
		).arg(error.type()
		).arg(error.description()));
	failDifferenceStartTimerFor(channel);
}

void Updates::stateDone(const MTPupdates_State &state) {
	const auto &d = state.c_updates_state();
	setState(d.vpts().v, d.vdate().v, d.vqts().v, d.vseq().v);

	_lastUpdateTime = crl::now();
	_noUpdatesTimer.callOnce(kNoUpdatesTimeout);
	_ptsWaiter.setRequesting(false);

	session().api().requestDialogs();
	updateOnline();
}

void Updates::differenceDone(const MTPupdates_Difference &result) {
	_failDifferenceTimeout = 1;

	switch (result.type()) {
	case mtpc_updates_differenceEmpty: {
		auto &d = result.c_updates_differenceEmpty();
		setState(_ptsWaiter.current(), d.vdate().v, _updatesQts, d.vseq().v);

		_lastUpdateTime = crl::now();
		_noUpdatesTimer.callOnce(kNoUpdatesTimeout);

		_ptsWaiter.setRequesting(false);
	} break;
	case mtpc_updates_differenceSlice: {
		auto &d = result.c_updates_differenceSlice();
		feedDifference(d.vusers(), d.vchats(), d.vnew_messages(), d.vother_updates());

		auto &s = d.vintermediate_state().c_updates_state();
		setState(s.vpts().v, s.vdate().v, s.vqts().v, s.vseq().v);

		_ptsWaiter.setRequesting(false);

		MTP_LOG(0, ("getDifference "
			"{ good - after a slice of difference was received }%1"
			).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));
		getDifference();
	} break;
	case mtpc_updates_difference: {
		auto &d = result.c_updates_difference();
		feedDifference(d.vusers(), d.vchats(), d.vnew_messages(), d.vother_updates());

		stateDone(d.vstate());
	} break;
	case mtpc_updates_differenceTooLong: {
		auto &d = result.c_updates_differenceTooLong();
		LOG(("API Error: updates.differenceTooLong is not supported by Telegram Desktop!"));
	} break;
	};
}

bool Updates::whenGetDiffChanged(
		ChannelData *channel,
		int32 ms,
		base::flat_map<not_null<ChannelData*>, crl::time> &whenMap,
		crl::time &curTime) {
	if (channel) {
		if (ms <= 0) {
			const auto i = whenMap.find(channel);
			if (i != whenMap.cend()) {
				whenMap.erase(i);
			} else {
				return false;
			}
		} else {
			auto when = crl::now() + ms;
			const auto i = whenMap.find(channel);
			if (i != whenMap.cend()) {
				if (i->second > when) {
					i->second = when;
				} else {
					return false;
				}
			} else {
				whenMap.emplace(channel, when);
			}
		}
	} else {
		if (ms <= 0) {
			if (curTime) {
				curTime = 0;
			} else {
				return false;
			}
		} else {
			auto when = crl::now() + ms;
			if (!curTime || curTime > when) {
				curTime = when;
			} else {
				return false;
			}
		}
	}
	return true;
}

void Updates::ptsWaiterStartTimerFor(ChannelData *channel, crl::time ms) {
	if (whenGetDiffChanged(channel, ms, _whenGetDiffByPts, _getDifferenceTimeByPts)) {
		getDifferenceByPts();
	}
}

void Updates::failDifferenceStartTimerFor(ChannelData *channel) {
	auto &timeout = [&]() -> crl::time & {
		if (!channel) {
			return _failDifferenceTimeout;
		}
		const auto i = _channelFailDifferenceTimeout.find(channel);
		return (i == _channelFailDifferenceTimeout.end())
			? _channelFailDifferenceTimeout.emplace(channel, 1).first->second
			: i->second;
	}();
	if (whenGetDiffChanged(channel, timeout * 1000, _whenGetDiffAfterFail, _getDifferenceTimeAfterFail)) {
		getDifferenceAfterFail();
	}
	if (timeout < 64) timeout *= 2;
}

bool Updates::updateAndApply(
		int32 pts,
		int32 ptsCount,
		const MTPUpdates &updates) {
	return _ptsWaiter.updateAndApply(nullptr, pts, ptsCount, updates);
}

bool Updates::updateAndApply(
		int32 pts,
		int32 ptsCount,
		const MTPUpdate &update) {
	return _ptsWaiter.updateAndApply(nullptr, pts, ptsCount, update);
}

bool Updates::updateAndApply(int32 pts, int32 ptsCount) {
	return _ptsWaiter.updateAndApply(nullptr, pts, ptsCount);
}

void Updates::feedDifference(
		const MTPVector<MTPUser> &users,
		const MTPVector<MTPChat> &chats,
		const MTPVector<MTPMessage> &msgs,
		const MTPVector<MTPUpdate> &other) {
	Core::App().checkAutoLock();
	session().data().processUsers(users);
	session().data().processChats(chats);
	feedMessageIds(other);
	session().data().processMessages(msgs, NewMessageType::Unread);
	feedUpdateVector(other, true);
}

void Updates::differenceFail(const RPCError &error) {
	LOG(("RPC Error in getDifference: %1 %2: %3"
		).arg(error.code()
		).arg(error.type()
		).arg(error.description()));
	failDifferenceStartTimerFor(nullptr);
}

void Updates::getDifferenceByPts() {
	auto now = crl::now(), wait = crl::time(0);
	if (_getDifferenceTimeByPts) {
		if (_getDifferenceTimeByPts > now) {
			wait = _getDifferenceTimeByPts - now;
		} else {
			getDifference();
		}
	}
	for (auto i = _whenGetDiffByPts.begin(); i != _whenGetDiffByPts.cend();) {
		if (i->second > now) {
			wait = wait ? std::min(wait, i->second - now) : (i->second - now);
			++i;
		} else {
			getChannelDifference(
				i->first,
				ChannelDifferenceRequest::PtsGapOrShortPoll);
			i = _whenGetDiffByPts.erase(i);
		}
	}
	if (wait) {
		_byPtsTimer.callOnce(wait);
	} else {
		_byPtsTimer.cancel();
	}
}

void Updates::getDifferenceAfterFail() {
	auto now = crl::now(), wait = crl::time(0);
	if (_getDifferenceTimeAfterFail) {
		if (_getDifferenceTimeAfterFail > now) {
			wait = _getDifferenceTimeAfterFail - now;
		} else {
			_ptsWaiter.setRequesting(false);
			MTP_LOG(0, ("getDifference "
				"{ force - after get difference failed }%1"
				).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));
			getDifference();
		}
	}
	for (auto i = _whenGetDiffAfterFail.begin(); i != _whenGetDiffAfterFail.cend();) {
		if (i->second > now) {
			wait = wait ? std::min(wait, i->second - now) : (i->second - now);
			++i;
		} else {
			getChannelDifference(i->first, ChannelDifferenceRequest::AfterFail);
			i = _whenGetDiffAfterFail.erase(i);
		}
	}
	if (wait) {
		_failDifferenceTimer.callOnce(wait);
	} else {
		_failDifferenceTimer.cancel();
	}
}

void Updates::getDifference() {
	_getDifferenceTimeByPts = 0;

	if (requestingDifference()) {
		return;
	}

	_bySeqUpdates.clear();
	_bySeqTimer.cancel();

	_noUpdatesTimer.cancel();
	_getDifferenceTimeAfterFail = 0;

	_ptsWaiter.setRequesting(true);

	api().request(MTPupdates_GetDifference(
		MTP_flags(0),
		MTP_int(_ptsWaiter.current()),
		MTPint(),
		MTP_int(_updatesDate),
		MTP_int(_updatesQts)
	)).done([=](const MTPupdates_Difference &result) {
		differenceDone(result);
	}).fail([=](const RPCError &error) {
		differenceFail(error);
	}).send();
}

void Updates::getChannelDifference(
		not_null<ChannelData*> channel,
		ChannelDifferenceRequest from) {
	if (from != ChannelDifferenceRequest::PtsGapOrShortPoll) {
		_whenGetDiffByPts.remove(channel);
	}

	if (!channel->ptsInited() || channel->ptsRequesting()) return;

	if (from != ChannelDifferenceRequest::AfterFail) {
		_whenGetDiffAfterFail.remove(channel);
	}

	channel->ptsSetRequesting(true);

	auto filter = MTP_channelMessagesFilterEmpty();
	auto flags = MTPupdates_GetChannelDifference::Flag::f_force | 0;
	if (from != ChannelDifferenceRequest::PtsGapOrShortPoll) {
		if (!channel->ptsWaitingForSkipped()) {
			flags = 0; // No force flag when requesting for short poll.
		}
	}
	api().request(MTPupdates_GetChannelDifference(
		MTP_flags(flags),
		channel->inputChannel,
		filter,
		MTP_int(channel->pts()),
		MTP_int(kChannelGetDifferenceLimit)
	)).done([=](const MTPupdates_ChannelDifference &result) {
		channelDifferenceDone(channel, result);
	}).fail([=](const RPCError &error) {
		channelDifferenceFail(channel, error);
	}).send();
}

void Updates::sendPing() {
	_session->mtp().ping();
}

void Updates::addActiveChat(rpl::producer<PeerData*> chat) {
	const auto key = _activeChats.empty() ? 0 : _activeChats.back().first + 1;
	std::move(
		chat
	) | rpl::start_with_next_done([=](PeerData *peer) {
		_activeChats[key].peer = peer;
		if (const auto channel = peer ? peer->asChannel() : nullptr) {
			channel->ptsWaitingForShortPoll(
				kWaitForChannelGetDifference);
		}
	}, [=] {
		_activeChats.erase(key);
	}, _activeChats[key].lifetime);
}

void Updates::requestChannelRangeDifference(not_null<History*> history) {
	Expects(history->isChannel());

	const auto channel = history->peer->asChannel();
	if (const auto requestId = _rangeDifferenceRequests.take(channel)) {
		api().request(*requestId).cancel();
	}
	const auto range = history->rangeForDifferenceRequest();
	if (!(range.from < range.till) || !channel->pts()) {
		return;
	}

	MTP_LOG(0, ("getChannelDifference "
		"{ good - after channelDifferenceTooLong was received, "
		"validating history part }%1"
		).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));
	channelRangeDifferenceSend(channel, range, channel->pts());
}

void Updates::channelRangeDifferenceSend(
		not_null<ChannelData*> channel,
		MsgRange range,
		int32 pts) {
	Expects(range.from < range.till);

	const auto limit = range.till - range.from;
	const auto filter = MTP_channelMessagesFilter(
		MTP_flags(0),
		MTP_vector<MTPMessageRange>(1, MTP_messageRange(
			MTP_int(range.from),
			MTP_int(range.till - 1))));
	const auto requestId = api().request(MTPupdates_GetChannelDifference(
		MTP_flags(MTPupdates_GetChannelDifference::Flag::f_force),
		channel->inputChannel,
		filter,
		MTP_int(pts),
		MTP_int(limit)
	)).done([=](const MTPupdates_ChannelDifference &result) {
		_rangeDifferenceRequests.remove(channel);
		channelRangeDifferenceDone(channel, range, result);
	}).fail([=](const RPCError &error) {
		_rangeDifferenceRequests.remove(channel);
	}).send();
	_rangeDifferenceRequests.emplace(channel, requestId);
}

void Updates::channelRangeDifferenceDone(
		not_null<ChannelData*> channel,
		MsgRange range,
		const MTPupdates_ChannelDifference &result) {
	auto nextRequestPts = int32(0);
	auto isFinal = true;

	switch (result.type()) {
	case mtpc_updates_channelDifferenceEmpty: {
		const auto &d = result.c_updates_channelDifferenceEmpty();
		nextRequestPts = d.vpts().v;
		isFinal = d.is_final();
	} break;

	case mtpc_updates_channelDifferenceTooLong: {
		const auto &d = result.c_updates_channelDifferenceTooLong();

		_session->data().processUsers(d.vusers());
		_session->data().processChats(d.vchats());

		nextRequestPts = d.vdialog().match([&](const MTPDdialog &data) {
			return data.vpts().value_or_empty();
		}, [&](const MTPDdialogFolder &data) {
			return 0;
		});
		isFinal = d.is_final();
	} break;

	case mtpc_updates_channelDifference: {
		const auto &d = result.c_updates_channelDifference();

		feedChannelDifference(d);

		nextRequestPts = d.vpts().v;
		isFinal = d.is_final();
	} break;
	}

	if (!isFinal && nextRequestPts) {
		MTP_LOG(0, ("getChannelDifference "
			"{ good - after not final channelDifference was received, "
			"validating history part }%1"
			).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));
		channelRangeDifferenceSend(channel, range, nextRequestPts);
	}
}

void Updates::mtpNewSessionCreated() {
	Core::App().checkAutoLock();
	_updatesSeq = 0;
	MTP_LOG(0, ("getDifference { after new_session_created }%1"
		).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));
	getDifference();
}

void Updates::mtpUpdateReceived(const MTPUpdates &updates) {
	Core::App().checkAutoLock();
	_lastUpdateTime = crl::now();
	_noUpdatesTimer.callOnce(kNoUpdatesTimeout);
	if (!requestingDifference()
		|| HasForceLogoutNotification(updates)) {
		applyUpdates(updates);
	}
}

void Updates::updateOnline() {
	updateOnline(false);
}

bool Updates::isIdle() const {
	return _isIdle;
}

void Updates::updateOnline(bool gotOtherOffline) {
	crl::on_main(&session(), [] { Core::App().checkAutoLock(); });

	const auto &config = _session->serverConfig();
	bool isOnline = Core::App().hasActiveWindow(&session());
	int updateIn = config.onlineUpdatePeriod;
	Assert(updateIn >= 0);
	if (isOnline) {
		const auto idle = crl::now() - Core::App().lastNonIdleTime();
		if (idle >= config.offlineIdleTimeout) {
			isOnline = false;
			if (!_isIdle) {
				_isIdle = true;
				_idleFinishTimer.callOnce(900);
			}
		} else {
			updateIn = qMin(updateIn, int(config.offlineIdleTimeout - idle));
			Assert(updateIn >= 0);
		}
	}
	auto ms = crl::now();
	if (isOnline != _lastWasOnline
		|| (isOnline && _lastSetOnline + config.onlineUpdatePeriod <= ms)
		|| (isOnline && gotOtherOffline)) {
		api().request(base::take(_onlineRequest)).cancel();

		_lastWasOnline = isOnline;
		_lastSetOnline = ms;
		if (!App::quitting()) {
			_onlineRequest = api().request(MTPaccount_UpdateStatus(
				MTP_bool(!isOnline)
			)).send();
		} else {
			_onlineRequest = api().request(MTPaccount_UpdateStatus(
				MTP_bool(!isOnline)
			)).done([=](const MTPBool &result) {
				Core::App().quitPreventFinished();
			}).fail([=](const RPCError &error) {
				Core::App().quitPreventFinished();
			}).send();
		}

		const auto self = session().user();
		self->onlineTill = base::unixtime::now() + (isOnline ? (config.onlineUpdatePeriod / 1000) : -1);
		session().changes().peerUpdated(
			self,
			Data::PeerUpdate::Flag::OnlineStatus);
		if (!isOnline) { // Went offline, so we need to save message draft to the cloud.
			api().saveCurrentDraftToCloud();
		}

		_lastSetOnline = ms;
	} else if (isOnline) {
		updateIn = qMin(updateIn, int(_lastSetOnline + config.onlineUpdatePeriod - ms));
		Assert(updateIn >= 0);
	}
	_onlineTimer.callOnce(updateIn);
}

void Updates::checkIdleFinish() {
	if (crl::now() - Core::App().lastNonIdleTime()
		< _session->serverConfig().offlineIdleTimeout) {
		_idleFinishTimer.cancel();
		_isIdle = false;
		updateOnline();
		App::wnd()->checkHistoryActivation();
	} else {
		_idleFinishTimer.callOnce(900);
	}
}

bool Updates::lastWasOnline() const {
	return _lastWasOnline;
}

crl::time Updates::lastSetOnline() const {
	return _lastSetOnline;
}

bool Updates::isQuitPrevent() {
	if (!_lastWasOnline) {
		return false;
	}
	LOG(("Api::Updates prevents quit, sending offline status..."));
	updateOnline();
	return true;
}

void Updates::applyUpdatesNoPtsCheck(const MTPUpdates &updates) {
	switch (updates.type()) {
	case mtpc_updateShortMessage: {
		const auto &d = updates.c_updateShortMessage();
		const auto flags = mtpCastFlags(d.vflags().v)
			| MTPDmessage::Flag::f_from_id;
		const auto peerUserId = d.is_out()
			? d.vuser_id()
			: MTP_int(_session->userId());
		_session->data().addNewMessage(
			MTP_message(
				MTP_flags(flags),
				d.vid(),
				(d.is_out()
					? peerToMTP(_session->userPeerId())
					: MTP_peerUser(d.vuser_id())),
				MTP_peerUser(d.vuser_id()),
				d.vfwd_from() ? *d.vfwd_from() : MTPMessageFwdHeader(),
				MTP_int(d.vvia_bot_id().value_or_empty()),
				d.vreply_to() ? *d.vreply_to() : MTPMessageReplyHeader(),
				d.vdate(),
				d.vmessage(),
				MTP_messageMediaEmpty(),
				MTPReplyMarkup(),
				MTP_vector<MTPMessageEntity>(d.ventities().value_or_empty()),
				MTPint(), // views
				MTPint(), // forwards
				MTPMessageReplies(),
				MTPint(), // edit_date
				MTPstring(),
				MTPlong(),
				//MTPMessageReactions(),
				MTPVector<MTPRestrictionReason>()),
			MTPDmessage_ClientFlags(),
			NewMessageType::Unread);
	} break;

	case mtpc_updateShortChatMessage: {
		const auto &d = updates.c_updateShortChatMessage();
		const auto flags = mtpCastFlags(d.vflags().v)
			| MTPDmessage::Flag::f_from_id;
		_session->data().addNewMessage(
			MTP_message(
				MTP_flags(flags),
				d.vid(),
				MTP_peerUser(d.vfrom_id()),
				MTP_peerChat(d.vchat_id()),
				d.vfwd_from() ? *d.vfwd_from() : MTPMessageFwdHeader(),
				MTP_int(d.vvia_bot_id().value_or_empty()),
				d.vreply_to() ? *d.vreply_to() : MTPMessageReplyHeader(),
				d.vdate(),
				d.vmessage(),
				MTP_messageMediaEmpty(),
				MTPReplyMarkup(),
				MTP_vector<MTPMessageEntity>(d.ventities().value_or_empty()),
				MTPint(), // views
				MTPint(), // forwards
				MTPMessageReplies(),
				MTPint(), // edit_date
				MTPstring(),
				MTPlong(),
				//MTPMessageReactions(),
				MTPVector<MTPRestrictionReason>()),
			MTPDmessage_ClientFlags(),
			NewMessageType::Unread);
	} break;

	case mtpc_updateShortSentMessage: {
		auto &d = updates.c_updateShortSentMessage();
		Q_UNUSED(d); // Sent message data was applied anyway.
	} break;

	default: Unexpected("Type in applyUpdatesNoPtsCheck()");
	}
}

void Updates::applyUpdateNoPtsCheck(const MTPUpdate &update) {
	switch (update.type()) {
	case mtpc_updateNewMessage: {
		auto &d = update.c_updateNewMessage();
		auto needToAdd = true;
		if (d.vmessage().type() == mtpc_message) { // index forwarded messages to links _overview
			const auto &data = d.vmessage().c_message();
			if (_session->data().checkEntitiesAndViewsUpdate(data)) { // already in blocks
				LOG(("Skipping message, because it is already in blocks!"));
				needToAdd = false;
			}
			if (needToAdd && !data.is_from_scheduled()) {
				// If we still need to add a new message,
				// we should first check if this message is in
				// the list of scheduled messages.
				// This is necessary to correctly update the file reference.
				// Note that when a message is scheduled until online
				// while the recipient is already online, the server sends
				// an ordinary new message with skipped "from_scheduled" flag.
				_session->data().scheduledMessages().checkEntitiesAndUpdate(
					data);
			}
		}
		if (needToAdd) {
			_session->data().addNewMessage(
				d.vmessage(),
				MTPDmessage_ClientFlags(),
				NewMessageType::Unread);
		}
	} break;

	case mtpc_updateReadMessagesContents: {
		const auto &d = update.c_updateReadMessagesContents();
		auto possiblyReadMentions = base::flat_set<MsgId>();
		for (const auto &msgId : d.vmessages().v) {
			if (const auto item = _session->data().message(NoChannel, msgId.v)) {
				if (item->isUnreadMedia() || item->isUnreadMention()) {
					item->markMediaRead();
					_session->data().requestItemRepaint(item);

					if (item->out()
						&& item->history()->peer->isUser()
						&& !requestingDifference()) {
						item->history()->peer->asUser()->madeAction(base::unixtime::now());
					}
				}
			} else {
				// Perhaps it was an unread mention!
				possiblyReadMentions.insert(msgId.v);
			}
		}
		session().api().checkForUnreadMentions(possiblyReadMentions);
	} break;

	case mtpc_updateReadHistoryInbox: {
		const auto &d = update.c_updateReadHistoryInbox();
		const auto peer = peerFromMTP(d.vpeer());
		if (const auto history = _session->data().historyLoaded(peer)) {
			const auto folderId = d.vfolder_id().value_or_empty();
			history->applyInboxReadUpdate(
				folderId,
				d.vmax_id().v,
				d.vstill_unread_count().v);
		}
	} break;

	case mtpc_updateReadHistoryOutbox: {
		const auto &d = update.c_updateReadHistoryOutbox();
		const auto peer = peerFromMTP(d.vpeer());
		if (const auto history = _session->data().historyLoaded(peer)) {
			history->outboxRead(d.vmax_id().v);
			if (!requestingDifference()) {
				if (const auto user = history->peer->asUser()) {
					user->madeAction(base::unixtime::now());
				}
			}
		}
	} break;

	case mtpc_updateWebPage: {
		auto &d = update.c_updateWebPage();
		Q_UNUSED(d); // Web page was updated anyway.
	} break;

	case mtpc_updateFolderPeers: {
		const auto &data = update.c_updateFolderPeers();
		auto &owner = _session->data();
		for (const auto &peer : data.vfolder_peers().v) {
			peer.match([&](const MTPDfolderPeer &data) {
				const auto peerId = peerFromMTP(data.vpeer());
				if (const auto history = owner.historyLoaded(peerId)) {
					if (const auto folderId = data.vfolder_id().v) {
						history->setFolder(owner.folder(folderId));
					} else {
						history->clearFolder();
					}
				}
			});
		}
	} break;

	case mtpc_updateDeleteMessages: {
		auto &d = update.c_updateDeleteMessages();
		_session->data().processMessagesDeleted(NoChannel, d.vmessages().v);
	} break;

	case mtpc_updateNewChannelMessage: {
		auto &d = update.c_updateNewChannelMessage();
		auto needToAdd = true;
		if (d.vmessage().type() == mtpc_message) { // index forwarded messages to links _overview
			if (_session->data().checkEntitiesAndViewsUpdate(d.vmessage().c_message())) { // already in blocks
				LOG(("Skipping message, because it is already in blocks!"));
				needToAdd = false;
			}
		}
		if (needToAdd) {
			_session->data().addNewMessage(
				d.vmessage(),
				MTPDmessage_ClientFlags(),
				NewMessageType::Unread);
		}
	} break;

	case mtpc_updateEditChannelMessage: {
		auto &d = update.c_updateEditChannelMessage();
		_session->data().updateEditedMessage(d.vmessage());
	} break;

	case mtpc_updateEditMessage: {
		auto &d = update.c_updateEditMessage();
		_session->data().updateEditedMessage(d.vmessage());
	} break;

	case mtpc_updateChannelWebPage: {
		auto &d = update.c_updateChannelWebPage();
		Q_UNUSED(d); // Web page was updated anyway.
	} break;

	case mtpc_updateDeleteChannelMessages: {
		auto &d = update.c_updateDeleteChannelMessages();
		_session->data().processMessagesDeleted(d.vchannel_id().v, d.vmessages().v);
	} break;

	default: Unexpected("Type in applyUpdateNoPtsCheck()");
	}
}

void Updates::applyUpdates(
		const MTPUpdates &updates,
		uint64 sentMessageRandomId) {
	const auto randomId = sentMessageRandomId;

	switch (updates.type()) {
	case mtpc_updates: {
		auto &d = updates.c_updates();
		if (d.vseq().v) {
			if (d.vseq().v <= _updatesSeq) {
				return;
			}
			if (d.vseq().v > _updatesSeq + 1) {
				_bySeqUpdates.emplace(d.vseq().v, updates);
				_bySeqTimer.callOnce(PtsWaiter::kWaitForSkippedTimeout);
				return;
			}
		}

		session().data().processUsers(d.vusers());
		session().data().processChats(d.vchats());
		feedUpdateVector(d.vupdates());

		setState(0, d.vdate().v, _updatesQts, d.vseq().v);
	} break;

	case mtpc_updatesCombined: {
		auto &d = updates.c_updatesCombined();
		if (d.vseq_start().v) {
			if (d.vseq_start().v <= _updatesSeq) {
				return;
			}
			if (d.vseq_start().v > _updatesSeq + 1) {
				_bySeqUpdates.emplace(d.vseq_start().v, updates);
				_bySeqTimer.callOnce(PtsWaiter::kWaitForSkippedTimeout);
				return;
			}
		}

		session().data().processUsers(d.vusers());
		session().data().processChats(d.vchats());
		feedUpdateVector(d.vupdates());

		setState(0, d.vdate().v, _updatesQts, d.vseq().v);
	} break;

	case mtpc_updateShort: {
		auto &d = updates.c_updateShort();
		feedUpdate(d.vupdate());

		setState(0, d.vdate().v, _updatesQts, _updatesSeq);
	} break;

	case mtpc_updateShortMessage: {
		auto &d = updates.c_updateShortMessage();
		const auto viaBotId = d.vvia_bot_id();
		const auto entities = d.ventities();
		const auto fwd = d.vfwd_from();
		if (!session().data().userLoaded(d.vuser_id().v)
			|| (viaBotId && !session().data().userLoaded(viaBotId->v))
			|| (entities && !MentionUsersLoaded(&session(), *entities))
			|| (fwd && !ForwardedInfoDataLoaded(&session(), *fwd))) {
			MTP_LOG(0, ("getDifference "
				"{ good - getting user for updateShortMessage }%1"
				).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));
			return getDifference();
		}
		if (updateAndApply(d.vpts().v, d.vpts_count().v, updates)) {
			// Update date as well.
			setState(0, d.vdate().v, _updatesQts, _updatesSeq);
		}
	} break;

	case mtpc_updateShortChatMessage: {
		auto &d = updates.c_updateShortChatMessage();
		const auto noFrom = !session().data().userLoaded(d.vfrom_id().v);
		const auto chat = session().data().chatLoaded(d.vchat_id().v);
		const auto viaBotId = d.vvia_bot_id();
		const auto entities = d.ventities();
		const auto fwd = d.vfwd_from();
		if (!chat
			|| noFrom
			|| (viaBotId && !session().data().userLoaded(viaBotId->v))
			|| (entities && !MentionUsersLoaded(&session(), *entities))
			|| (fwd && !ForwardedInfoDataLoaded(&session(), *fwd))) {
			MTP_LOG(0, ("getDifference "
				"{ good - getting user for updateShortChatMessage }%1"
				).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));
			if (chat && noFrom) {
				session().api().requestFullPeer(chat);
			}
			return getDifference();
		}
		if (updateAndApply(d.vpts().v, d.vpts_count().v, updates)) {
			// Update date as well.
			setState(0, d.vdate().v, _updatesQts, _updatesSeq);
		}
	} break;

	case mtpc_updateShortSentMessage: {
		auto &d = updates.c_updateShortSentMessage();
		if (!IsServerMsgId(d.vid().v)) {
			LOG(("API Error: Bad msgId got from server: %1").arg(d.vid().v));
		} else if (randomId) {
			auto &owner = session().data();
			const auto sent = owner.messageSentData(randomId);
			const auto lookupMessage = [&] {
				return sent.peerId
					? owner.message(peerToChannel(sent.peerId), d.vid().v)
					: nullptr;
			};
			if (const auto id = owner.messageIdByRandomId(randomId)) {
				const auto local = owner.message(id);
				if (local && local->isScheduled()) {
					owner.scheduledMessages().sendNowSimpleMessage(d, local);
				}
			}
			const auto wasAlready = (lookupMessage() != nullptr);
			feedUpdate(MTP_updateMessageID(d.vid(), MTP_long(randomId))); // ignore real date
			if (const auto item = lookupMessage()) {
				const auto list = d.ventities();
				if (list && !MentionUsersLoaded(&session(), *list)) {
					session().api().requestMessageData(
						item->history()->peer->asChannel(),
						item->id,
						ApiWrap::RequestMessageDataCallback());
				}
				item->updateSentContent({
					sent.text,
					Api::EntitiesFromMTP(&session(), list.value_or_empty())
				}, d.vmedia());
				item->contributeToSlowmode(d.vdate().v);
				if (!wasAlready) {
					item->indexAsNewItem();
				}
			}
		}

		if (updateAndApply(d.vpts().v, d.vpts_count().v, updates)) {
			// Update date as well.
			setState(0, d.vdate().v, _updatesQts, _updatesSeq);
		}
	} break;

	case mtpc_updatesTooLong: {
		MTP_LOG(0, ("getDifference "
			"{ good - updatesTooLong received }%1"
			).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));
		return getDifference();
	} break;
	}
	session().data().sendHistoryChangeNotifications();
}

void Updates::feedUpdate(const MTPUpdate &update) {
	switch (update.type()) {

	// New messages.
	case mtpc_updateNewMessage: {
		auto &d = update.c_updateNewMessage();

		const auto isDataLoaded = AllDataLoadedForMessage(&session(), d.vmessage());
		if (!requestingDifference() && isDataLoaded != DataIsLoadedResult::Ok) {
			MTP_LOG(0, ("getDifference "
				"{ good - after not all data loaded in updateNewMessage }%1"
				).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));

			// This can be if this update was created by grouping
			// some short message update into an updates vector.
			return getDifference();
		}

		updateAndApply(d.vpts().v, d.vpts_count().v, update);
	} break;

	case mtpc_updateNewChannelMessage: {
		auto &d = update.c_updateNewChannelMessage();
		auto channel = session().data().channelLoaded(peerToChannel(PeerFromMessage(d.vmessage())));
		const auto isDataLoaded = AllDataLoadedForMessage(&session(), d.vmessage());
		if (!requestingDifference() && (!channel || isDataLoaded != DataIsLoadedResult::Ok)) {
			MTP_LOG(0, ("getDifference "
				"{ good - after not all data loaded in updateNewChannelMessage }%1"
				).arg(_session->mtp().isTestMode() ? " TESTMODE" : ""));

			// Request last active supergroup participants if the 'from' user was not loaded yet.
			// This will optimize similar getDifference() calls for almost all next messages.
			if (isDataLoaded == DataIsLoadedResult::FromNotLoaded && channel && channel->isMegagroup()) {
				if (channel->mgInfo->lastParticipants.size() < _session->serverConfig().chatSizeMax
					&& (channel->mgInfo->lastParticipants.empty()
						|| channel->mgInfo->lastParticipants.size() < channel->membersCount())) {
					session().api().requestLastParticipants(channel);
				}
			}

			if (!_byMinChannelTimer.isActive()) { // getDifference after timeout
				_byMinChannelTimer.callOnce(PtsWaiter::kWaitForSkippedTimeout);
			}
			return;
		}
		if (channel && !_handlingChannelDifference) {
			if (channel->ptsRequesting()) { // skip global updates while getting channel difference
				return;
			}
			channel->ptsUpdateAndApply(d.vpts().v, d.vpts_count().v, update);
		} else {
			applyUpdateNoPtsCheck(update);
		}
	} break;

	case mtpc_updateMessageID: {
		const auto &d = update.c_updateMessageID();
		const auto randomId = d.vrandom_id().v;
		if (const auto id = session().data().messageIdByRandomId(randomId)) {
			const auto newId = d.vid().v;
			if (const auto local = session().data().message(id)) {
				if (local->isScheduled()) {
					session().data().scheduledMessages().apply(d, local);
				} else {
					const auto channel = id.channel;
					const auto existing = session().data().message(
						channel,
						newId);
					if (existing && !local->mainView()) {
						const auto history = local->history();
						local->destroy();
						history->requestChatListMessage();
					} else {
						if (existing) {
							existing->destroy();
						}
						local->setRealId(d.vid().v);
					}
				}
			}
			session().data().unregisterMessageRandomId(randomId);
		}
		session().data().unregisterMessageSentData(randomId);
	} break;

	// Message contents being read.
	case mtpc_updateReadMessagesContents: {
		auto &d = update.c_updateReadMessagesContents();
		updateAndApply(d.vpts().v, d.vpts_count().v, update);
	} break;

	case mtpc_updateChannelReadMessagesContents: {
		auto &d = update.c_updateChannelReadMessagesContents();
		auto channel = session().data().channelLoaded(d.vchannel_id().v);
		if (!channel) {
			if (!_byMinChannelTimer.isActive()) {
				// getDifference after timeout.
				_byMinChannelTimer.callOnce(PtsWaiter::kWaitForSkippedTimeout);
			}
			return;
		}
		auto possiblyReadMentions = base::flat_set<MsgId>();
		for_const (auto &msgId, d.vmessages().v) {
			if (auto item = session().data().message(channel, msgId.v)) {
				if (item->isUnreadMedia() || item->isUnreadMention()) {
					item->markMediaRead();
					session().data().requestItemRepaint(item);
				}
			} else {
				// Perhaps it was an unread mention!
				possiblyReadMentions.insert(msgId.v);
			}
		}
		session().api().checkForUnreadMentions(possiblyReadMentions, channel);
	} break;

	// Edited messages.
	case mtpc_updateEditMessage: {
		auto &d = update.c_updateEditMessage();
		updateAndApply(d.vpts().v, d.vpts_count().v, update);
	} break;

	case mtpc_updateEditChannelMessage: {
		auto &d = update.c_updateEditChannelMessage();
		auto channel = session().data().channelLoaded(peerToChannel(PeerFromMessage(d.vmessage())));

		if (channel && !_handlingChannelDifference) {
			if (channel->ptsRequesting()) { // skip global updates while getting channel difference
				return;
			} else {
				channel->ptsUpdateAndApply(d.vpts().v, d.vpts_count().v, update);
			}
		} else {
			applyUpdateNoPtsCheck(update);
		}
	} break;

	// Messages being read.
	case mtpc_updateReadHistoryInbox: {
		auto &d = update.c_updateReadHistoryInbox();
		updateAndApply(d.vpts().v, d.vpts_count().v, update);
	} break;

	case mtpc_updateReadHistoryOutbox: {
		auto &d = update.c_updateReadHistoryOutbox();
		updateAndApply(d.vpts().v, d.vpts_count().v, update);
	} break;

	case mtpc_updateReadChannelInbox: {
		const auto &d = update.c_updateReadChannelInbox();
		const auto peer = peerFromChannel(d.vchannel_id().v);
		if (const auto history = session().data().historyLoaded(peer)) {
			history->applyInboxReadUpdate(
				d.vfolder_id().value_or_empty(),
				d.vmax_id().v,
				d.vstill_unread_count().v,
				d.vpts().v);
		}
	} break;

	case mtpc_updateReadChannelOutbox: {
		const auto &d = update.c_updateReadChannelOutbox();
		const auto peer = peerFromChannel(d.vchannel_id().v);
		if (const auto history = session().data().historyLoaded(peer)) {
			history->outboxRead(d.vmax_id().v);
			if (!requestingDifference()) {
				if (const auto user = history->peer->asUser()) {
					user->madeAction(base::unixtime::now());
				}
			}
		}
	} break;

	//case mtpc_updateReadFeed: { // #feed
	//	const auto &d = update.c_updateReadFeed();
	//	const auto feedId = d.vfeed_id().v;
	//	if (const auto feed = session().data().feedLoaded(feedId)) {
	//		feed->setUnreadPosition(
	//			Data::FeedPositionFromMTP(d.vmax_position()));
	//		if (d.vunread_count() && d.vunread_muted_count()) {
	//			feed->setUnreadCounts(
	//				d.vunread_count()->v,
	//				d.vunread_muted_count()->v);
	//		} else {
	//			session().data().histories().requestDialogEntry(feed);
	//		}
	//	}
	//} break;

	case mtpc_updateDialogUnreadMark: {
		const auto &data = update.c_updateDialogUnreadMark();
		data.vpeer().match(
		[&](const MTPDdialogPeer &dialog) {
			const auto id = peerFromMTP(dialog.vpeer());
			if (const auto history = session().data().historyLoaded(id)) {
				history->setUnreadMark(data.is_unread());
			}
		}, [&](const MTPDdialogPeerFolder &dialog) {
			const auto id = dialog.vfolder_id().v; // #TODO archive
			//if (const auto folder = session().data().folderLoaded(id)) {
			//	folder->setUnreadMark(data.is_unread());
			//}
		});
	} break;

	case mtpc_updateFolderPeers: {
		const auto &data = update.c_updateFolderPeers();

		updateAndApply(data.vpts().v, data.vpts_count().v, update);
	} break;

	case mtpc_updateDialogFilter:
	case mtpc_updateDialogFilterOrder:
	case mtpc_updateDialogFilters: {
		session().data().chatsFilters().apply(update);
	} break;

	// Deleted messages.
	case mtpc_updateDeleteMessages: {
		auto &d = update.c_updateDeleteMessages();

		updateAndApply(d.vpts().v, d.vpts_count().v, update);
	} break;

	case mtpc_updateDeleteChannelMessages: {
		auto &d = update.c_updateDeleteChannelMessages();
		auto channel = session().data().channelLoaded(d.vchannel_id().v);

		if (channel && !_handlingChannelDifference) {
			if (channel->ptsRequesting()) { // skip global updates while getting channel difference
				return;
			}
			channel->ptsUpdateAndApply(d.vpts().v, d.vpts_count().v, update);
		} else {
			applyUpdateNoPtsCheck(update);
		}
	} break;

	case mtpc_updateNewScheduledMessage: {
		const auto &d = update.c_updateNewScheduledMessage();
		session().data().scheduledMessages().apply(d);
	} break;

	case mtpc_updateDeleteScheduledMessages: {
		const auto &d = update.c_updateDeleteScheduledMessages();
		session().data().scheduledMessages().apply(d);
	} break;

	case mtpc_updateWebPage: {
		auto &d = update.c_updateWebPage();

		// Update web page anyway.
		session().data().processWebpage(d.vwebpage());
		session().data().sendWebPageGamePollNotifications();

		updateAndApply(d.vpts().v, d.vpts_count().v, update);
	} break;

	case mtpc_updateChannelWebPage: {
		auto &d = update.c_updateChannelWebPage();

		// Update web page anyway.
		session().data().processWebpage(d.vwebpage());
		session().data().sendWebPageGamePollNotifications();

		auto channel = session().data().channelLoaded(d.vchannel_id().v);
		if (channel && !_handlingChannelDifference) {
			if (channel->ptsRequesting()) { // skip global updates while getting channel difference
				return;
			} else {
				channel->ptsUpdateAndApply(d.vpts().v, d.vpts_count().v, update);
			}
		} else {
			applyUpdateNoPtsCheck(update);
		}
	} break;

	case mtpc_updateMessagePoll: {
		session().data().applyUpdate(update.c_updateMessagePoll());
	} break;

	case mtpc_updateUserTyping: {
		auto &d = update.c_updateUserTyping();
		const auto userId = peerFromUser(d.vuser_id());
		const auto history = session().data().historyLoaded(userId);
		const auto user = session().data().userLoaded(d.vuser_id().v);
		if (history && user) {
			const auto when = requestingDifference() ? 0 : base::unixtime::now();
			session().data().registerSendAction(
				history,
				MsgId(),
				user,
				d.vaction(),
				when);
		}
	} break;

	case mtpc_updateChatUserTyping: {
		auto &d = update.c_updateChatUserTyping();
		const auto history = session().data().historyLoaded(
			peerFromChat(d.vchat_id()));
		const auto user = (d.vuser_id().v == session().userId())
			? nullptr
			: session().data().userLoaded(d.vuser_id().v);
		if (history && user) {
			const auto when = requestingDifference() ? 0 : base::unixtime::now();
			session().data().registerSendAction(
				history,
				MsgId(),
				user,
				d.vaction(),
				when);
		}
	} break;

	case mtpc_updateChannelUserTyping: {
		const auto &d = update.c_updateChannelUserTyping();
		const auto history = session().data().historyLoaded(
			peerFromChannel(d.vchannel_id()));
		const auto user = (d.vuser_id().v == session().userId())
			? nullptr
			: session().data().userLoaded(d.vuser_id().v);
		if (history && user) {
			const auto when = requestingDifference()
				? 0
				: base::unixtime::now();
			const auto rootId = d.vtop_msg_id().value_or_empty();
			session().data().registerSendAction(
				history,
				rootId,
				user,
				d.vaction(),
				when);
		}
	} break;

	case mtpc_updateChatParticipants: {
		session().data().applyUpdate(update.c_updateChatParticipants());
	} break;

	case mtpc_updateChatParticipantAdd: {
		session().data().applyUpdate(update.c_updateChatParticipantAdd());
	} break;

	case mtpc_updateChatParticipantDelete: {
		session().data().applyUpdate(update.c_updateChatParticipantDelete());
	} break;

	case mtpc_updateChatParticipantAdmin: {
		session().data().applyUpdate(update.c_updateChatParticipantAdmin());
	} break;

	case mtpc_updateChatDefaultBannedRights: {
		session().data().applyUpdate(update.c_updateChatDefaultBannedRights());
	} break;

	case mtpc_updateUserStatus: {
		auto &d = update.c_updateUserStatus();
		if (auto user = session().data().userLoaded(d.vuser_id().v)) {
			switch (d.vstatus().type()) {
			case mtpc_userStatusEmpty: user->onlineTill = 0; break;
			case mtpc_userStatusRecently:
				if (user->onlineTill > -10) { // don't modify pseudo-online
					user->onlineTill = -2;
				}
			break;
			case mtpc_userStatusLastWeek: user->onlineTill = -3; break;
			case mtpc_userStatusLastMonth: user->onlineTill = -4; break;
			case mtpc_userStatusOffline: user->onlineTill = d.vstatus().c_userStatusOffline().vwas_online().v; break;
			case mtpc_userStatusOnline: user->onlineTill = d.vstatus().c_userStatusOnline().vexpires().v; break;
			}
			session().changes().peerUpdated(
				user,
				Data::PeerUpdate::Flag::OnlineStatus);
		}
		if (d.vuser_id().v == session().userId()) {
			if (d.vstatus().type() == mtpc_userStatusOffline
				|| d.vstatus().type() == mtpc_userStatusEmpty) {
				updateOnline(true);
				if (d.vstatus().type() == mtpc_userStatusOffline) {
					cSetOtherOnline(
						d.vstatus().c_userStatusOffline().vwas_online().v);
				}
			} else if (d.vstatus().type() == mtpc_userStatusOnline) {
				cSetOtherOnline(
					d.vstatus().c_userStatusOnline().vexpires().v);
			}
		}
	} break;

	case mtpc_updateUserName: {
		auto &d = update.c_updateUserName();
		if (auto user = session().data().userLoaded(d.vuser_id().v)) {
			if (!user->isContact()) {
				user->setName(
					TextUtilities::SingleLine(qs(d.vfirst_name())),
					TextUtilities::SingleLine(qs(d.vlast_name())),
					user->nameOrPhone,
					TextUtilities::SingleLine(qs(d.vusername())));
			} else {
				user->setName(
					TextUtilities::SingleLine(user->firstName),
					TextUtilities::SingleLine(user->lastName),
					user->nameOrPhone,
					TextUtilities::SingleLine(qs(d.vusername())));
			}
		}
	} break;

	case mtpc_updateUserPhoto: {
		auto &d = update.c_updateUserPhoto();
		if (auto user = session().data().userLoaded(d.vuser_id().v)) {
			user->setPhoto(d.vphoto());
			user->loadUserpic();
			// After that update we don't have enough information to
			// create a 'photo' with all necessary fields. So if
			// we receive second such update we end up with a 'photo_id'
			// in user_photos list without a loaded 'photo'.
			// It fails to show in media overview if you try to open it.
			//
			//if (mtpIsTrue(d.vprevious()) || !user->userpicPhotoId()) {
				session().storage().remove(Storage::UserPhotosRemoveAfter(
					user->bareId(),
					user->userpicPhotoId()));
			//} else {
			//	session().storage().add(Storage::UserPhotosAddNew(
			//		user->bareId(),
			//		user->userpicPhotoId()));
			//}
		}
	} break;

	case mtpc_updatePeerSettings: {
		const auto &d = update.c_updatePeerSettings();
		const auto peerId = peerFromMTP(d.vpeer());
		if (const auto peer = session().data().peerLoaded(peerId)) {
			const auto settings = d.vsettings().match([](
					const MTPDpeerSettings &data) {
				return data.vflags().v;
			});
			peer->setSettings(settings);
		}
	} break;

	case mtpc_updateNotifySettings: {
		auto &d = update.c_updateNotifySettings();
		session().data().applyNotifySetting(d.vpeer(), d.vnotify_settings());
	} break;

	case mtpc_updateDcOptions: {
		auto &d = update.c_updateDcOptions();
		session().mtp().dcOptions().addFromList(d.vdc_options());
	} break;

	case mtpc_updateConfig: {
		session().mtp().requestConfig();
	} break;

	case mtpc_updateUserPhone: {
		const auto &d = update.c_updateUserPhone();
		if (const auto user = session().data().userLoaded(d.vuser_id().v)) {
			const auto newPhone = qs(d.vphone());
			if (newPhone != user->phone()) {
				user->setPhone(newPhone);
				user->setName(
					user->firstName,
					user->lastName,
					((user->isContact()
						|| user->isServiceUser()
						|| user->isSelf()
						|| user->phone().isEmpty())
						? QString()
						: App::formatPhone(user->phone())),
					user->username);

				session().changes().peerUpdated(
					user,
					Data::PeerUpdate::Flag::PhoneNumber);
			}
		}
	} break;

	case mtpc_updateNewEncryptedMessage: {
		auto &d = update.c_updateNewEncryptedMessage();
	} break;

	case mtpc_updateEncryptedChatTyping: {
		auto &d = update.c_updateEncryptedChatTyping();
	} break;

	case mtpc_updateEncryption: {
		auto &d = update.c_updateEncryption();
	} break;

	case mtpc_updateEncryptedMessagesRead: {
		auto &d = update.c_updateEncryptedMessagesRead();
	} break;

	case mtpc_updatePhoneCall:
	case mtpc_updatePhoneCallSignalingData: {
		Core::App().calls().handleUpdate(&session(), update);
	} break;

	case mtpc_updatePeerBlocked: {
		const auto &d = update.c_updatePeerBlocked();
		if (const auto peer = session().data().peerLoaded(peerFromMTP(d.vpeer_id()))) {
			peer->setIsBlocked(mtpIsTrue(d.vblocked()));
		}
	} break;

	case mtpc_updateServiceNotification: {
		const auto &d = update.c_updateServiceNotification();
		const auto text = TextWithEntities {
			qs(d.vmessage()),
			Api::EntitiesFromMTP(&session(), d.ventities().v)
		};
		if (IsForceLogoutNotification(d)) {
			Core::App().forceLogOut(&session().account(), text);
		} else if (d.is_popup()) {
			const auto &windows = session().windows();
			if (!windows.empty()) {
				windows.front()->window().show(Box<InformBox>(text));
			}
		} else {
			session().data().serviceNotification(text, d.vmedia());
			session().data().checkNewAuthorization();
		}
	} break;

	case mtpc_updatePrivacy: {
		auto &d = update.c_updatePrivacy();
		const auto allChatsLoaded = [&](const MTPVector<MTPint> &ids) {
			for (const auto &chatId : ids.v) {
				if (!session().data().chatLoaded(chatId.v)
					&& !session().data().channelLoaded(chatId.v)) {
					return false;
				}
			}
			return true;
		};
		const auto allLoaded = [&] {
			for (const auto &rule : d.vrules().v) {
				const auto loaded = rule.match([&](
					const MTPDprivacyValueAllowChatParticipants & data) {
					return allChatsLoaded(data.vchats());
				}, [&](const MTPDprivacyValueDisallowChatParticipants & data) {
					return allChatsLoaded(data.vchats());
				}, [](auto &&) { return true; });
				if (!loaded) {
					return false;
				}
			}
			return true;
		};
		if (const auto key = ApiWrap::Privacy::KeyFromMTP(d.vkey().type())) {
			if (allLoaded()) {
				session().api().handlePrivacyChange(*key, d.vrules());
			} else {
				session().api().reloadPrivacy(*key);
			}
		}
	} break;

	case mtpc_updatePinnedDialogs: {
		const auto &d = update.c_updatePinnedDialogs();
		const auto folderId = d.vfolder_id().value_or_empty();
		const auto loaded = !folderId
			|| (session().data().folderLoaded(folderId) != nullptr);
		const auto folder = folderId
			? session().data().folder(folderId).get()
			: nullptr;
		const auto done = [&] {
			const auto list = d.vorder();
			if (!list) {
				return false;
			}
			const auto &order = list->v;
			const auto notLoaded = [&](const MTPDialogPeer &peer) {
				return peer.match([&](const MTPDdialogPeer &data) {
					return !session().data().historyLoaded(
						peerFromMTP(data.vpeer()));
				}, [&](const MTPDdialogPeerFolder &data) {
					if (folderId) {
						LOG(("API Error: "
							"updatePinnedDialogs has nested folders."));
						return true;
					}
					return !session().data().folderLoaded(data.vfolder_id().v);
				});
			};
			if (!ranges::none_of(order, notLoaded)) {
				return false;
			}
			session().data().applyPinnedChats(folder, order);
			return true;
		}();
		if (!done) {
			session().api().requestPinnedDialogs(folder);
		}
		if (!loaded) {
			session().data().histories().requestDialogEntry(folder);
		}
	} break;

	case mtpc_updateDialogPinned: {
		const auto &d = update.c_updateDialogPinned();
		const auto folderId = d.vfolder_id().value_or_empty();
		const auto folder = folderId
			? session().data().folder(folderId).get()
			: nullptr;
		const auto done = d.vpeer().match([&](const MTPDdialogPeer &data) {
			const auto id = peerFromMTP(data.vpeer());
			if (const auto history = session().data().historyLoaded(id)) {
				history->applyPinnedUpdate(d);
				return true;
			}
			DEBUG_LOG(("API Error: "
				"pinned chat not loaded for peer %1, folder: %2"
				).arg(id
				).arg(folderId
				));
			return false;
		}, [&](const MTPDdialogPeerFolder &data) {
			if (folderId != 0) {
				DEBUG_LOG(("API Error: Nested folders updateDialogPinned."));
				return false;
			}
			const auto id = data.vfolder_id().v;
			if (const auto folder = session().data().folderLoaded(id)) {
				folder->applyPinnedUpdate(d);
				return true;
			}
			DEBUG_LOG(("API Error: "
				"pinned folder not loaded for folderId %1, folder: %2"
				).arg(id
				).arg(folderId
				));
			return false;
		});
		if (!done) {
			session().api().requestPinnedDialogs(folder);
		}
	} break;

	case mtpc_updateChannel: {
		auto &d = update.c_updateChannel();
		if (const auto channel = session().data().channelLoaded(d.vchannel_id().v)) {
			channel->inviter = UserId(0);
			if (channel->amIn()) {
				if (channel->isMegagroup()
					&& !channel->amCreator()
					&& !channel->hasAdminRights()) {
					channel->updateFullForced();
				}
				const auto history = channel->owner().history(channel);
				//if (const auto feed = channel->feed()) { // #feed
				//	feed->requestChatListMessage();
				//	if (!feed->unreadCountKnown()) {
				//		feed->owner().histories().requestDialogEntry(feed);
				//	}
				//} else {
					history->requestChatListMessage();
					if (!history->unreadCountKnown()) {
						history->owner().histories().requestDialogEntry(history);
					}
				//}
				if (!channel->amCreator()) {
					session().api().requestSelfParticipant(channel);
				}
			}
		}
	} break;

	case mtpc_updateChannelTooLong: {
		const auto &d = update.c_updateChannelTooLong();
		if (const auto channel = session().data().channelLoaded(d.vchannel_id().v)) {
			const auto pts = d.vpts();
			if (!pts || channel->pts() < pts->v) {
				getChannelDifference(channel);
			}
		}
	} break;

	case mtpc_updateChannelMessageViews: {
		const auto &d = update.c_updateChannelMessageViews();
		if (const auto item = session().data().message(d.vchannel_id().v, d.vid().v)) {
			item->setViewsCount(d.vviews().v);
		}
	} break;

	case mtpc_updateChannelMessageForwards: {
		const auto &d = update.c_updateChannelMessageForwards();
		if (const auto item = session().data().message(d.vchannel_id().v, d.vid().v)) {
			item->setForwardsCount(d.vforwards().v);
		}
	} break;

	case mtpc_updateReadChannelDiscussionInbox: {
		const auto &d = update.c_updateReadChannelDiscussionInbox();
		const auto channelId = d.vchannel_id().v;
		const auto msgId = d.vtop_msg_id().v;
		const auto readTillId = d.vread_max_id().v;
		const auto item = session().data().message(channelId, msgId);
		if (item) {
			item->setRepliesInboxReadTill(readTillId);
			if (const auto post = item->lookupDiscussionPostOriginal()) {
				post->setRepliesInboxReadTill(readTillId);
			}
		}
		if (const auto broadcastId = d.vbroadcast_id()) {
			if (const auto post = session().data().message(
					broadcastId->v,
					d.vbroadcast_post()->v)) {
				post->setRepliesInboxReadTill(readTillId);
			}
		}
	} break;

	case mtpc_updateReadChannelDiscussionOutbox: {
		const auto &d = update.c_updateReadChannelDiscussionOutbox();
		const auto channelId = d.vchannel_id().v;
		const auto msgId = d.vtop_msg_id().v;
		const auto readTillId = d.vread_max_id().v;
		const auto item = session().data().message(channelId, msgId);
		if (item) {
			item->setRepliesOutboxReadTill(readTillId);
			if (const auto post = item->lookupDiscussionPostOriginal()) {
				post->setRepliesOutboxReadTill(readTillId);
			}
		}
	} break;

	case mtpc_updateChannelAvailableMessages: {
		auto &d = update.c_updateChannelAvailableMessages();
		if (const auto channel = session().data().channelLoaded(d.vchannel_id().v)) {
			channel->setAvailableMinId(d.vavailable_min_id().v);
			if (const auto history = session().data().historyLoaded(channel)) {
				history->clearUpTill(d.vavailable_min_id().v);
			}
		}
	} break;

	// Pinned message.
	case mtpc_updateUserPinnedMessage: {
		const auto &d = update.c_updateUserPinnedMessage();
		if (const auto user = session().data().userLoaded(d.vuser_id().v)) {
			user->setPinnedMessageId(d.vid().v);
		}
	} break;

	case mtpc_updateChatPinnedMessage: {
		const auto &d = update.c_updateChatPinnedMessage();
		if (const auto chat = session().data().chatLoaded(d.vchat_id().v)) {
			const auto status = chat->applyUpdateVersion(d.vversion().v);
			if (status == ChatData::UpdateStatus::Good) {
				chat->setPinnedMessageId(d.vid().v);
			}
		}
	} break;

	case mtpc_updateChannelPinnedMessage: {
		const auto &d = update.c_updateChannelPinnedMessage();
		if (const auto channel = session().data().channelLoaded(d.vchannel_id().v)) {
			channel->setPinnedMessageId(d.vid().v);
		}
	} break;

	////// Cloud sticker sets
	case mtpc_updateNewStickerSet: {
		const auto &d = update.c_updateNewStickerSet();
		session().data().stickers().newSetReceived(d.vstickerset());
	} break;

	case mtpc_updateStickerSetsOrder: {
		auto &d = update.c_updateStickerSetsOrder();
		if (!d.is_masks()) {
			const auto &order = d.vorder().v;
			const auto &sets = session().data().stickers().sets();
			Data::StickersSetsOrder result;
			for (const auto &item : order) {
				if (sets.find(item.v) == sets.cend()) {
					break;
				}
				result.push_back(item.v);
			}
			if (result.size() != session().data().stickers().setsOrder().size()
				|| result.size() != order.size()) {
				session().data().stickers().setLastUpdate(0);
				session().api().updateStickers();
			} else {
				session().data().stickers().setsOrderRef() = std::move(result);
				session().local().writeInstalledStickers();
				session().data().stickers().notifyUpdated();
			}
		}
	} break;

	case mtpc_updateStickerSets: {
		session().data().stickers().setLastUpdate(0);
		session().api().updateStickers();
	} break;

	case mtpc_updateRecentStickers: {
		session().data().stickers().setLastRecentUpdate(0);
		session().api().updateStickers();
	} break;

	case mtpc_updateFavedStickers: {
		session().data().stickers().setLastFavedUpdate(0);
		session().api().updateStickers();
	} break;

	case mtpc_updateReadFeaturedStickers: {
		// We read some of the featured stickers, perhaps not all of them.
		// Here we don't know what featured sticker sets were read, so we
		// request all of them once again.
		session().data().stickers().setLastFeaturedUpdate(0);
		session().api().updateStickers();
	} break;

	////// Cloud saved GIFs
	case mtpc_updateSavedGifs: {
		session().data().stickers().setLastSavedGifsUpdate(0);
		session().api().updateStickers();
	} break;

	////// Cloud drafts
	case mtpc_updateDraftMessage: {
		const auto &data = update.c_updateDraftMessage();
		const auto peerId = peerFromMTP(data.vpeer());
		data.vdraft().match([&](const MTPDdraftMessage &data) {
			Data::ApplyPeerCloudDraft(&session(), peerId, data);
		}, [&](const MTPDdraftMessageEmpty &data) {
			Data::ClearPeerCloudDraft(
				&session(),
				peerId,
				data.vdate().value_or_empty());
		});
	} break;

	////// Cloud langpacks
	case mtpc_updateLangPack: {
		const auto &data = update.c_updateLangPack();
		Lang::CurrentCloudManager().applyLangPackDifference(data.vdifference());
	} break;

	case mtpc_updateLangPackTooLong: {
		const auto &data = update.c_updateLangPackTooLong();
		const auto code = qs(data.vlang_code());
		if (!code.isEmpty()) {
			Lang::CurrentCloudManager().requestLangPackDifference(code);
		}
	} break;

	////// Cloud themes
	case mtpc_updateTheme: {
		const auto &data = update.c_updateTheme();
		session().data().cloudThemes().applyUpdate(data.vtheme());
	} break;

	}
}

} // namespace Api