/*
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
*/
#pragma once

#include "api/api_common.h"
#include "base/timer.h"
#include "base/flat_map.h"
#include "base/flat_set.h"
#include "mtproto/sender.h"
#include "chat_helpers/stickers.h"
#include "data/data_messages.h"

class TaskQueue;
struct MessageGroupId;
struct SendingAlbum;
enum class SendMediaType;
struct FileLoadTo;

namespace Main {
class Session;
} // namespace Main

namespace Data {
struct UpdatedFileReferences;
class WallPaper;
} // namespace Data

namespace InlineBots {
class Result;
} // namespace InlineBots

namespace Storage {
enum class SharedMediaType : signed char;
struct PreparedList;
class DownloadMtprotoTask;
} // namespace Storage

namespace Dialogs {
class Key;
} // namespace Dialogs

namespace Core {
struct CloudPasswordState;
} // namespace Core

namespace Api {
namespace details {

inline QString ToString(const QString &value) {
	return value;
}

inline QString ToString(int32 value) {
	return QString::number(value);
}

inline QString ToString(uint64 value) {
	return QString::number(value);
}

} // namespace details

template <
	typename ...Types,
	typename = std::enable_if_t<(sizeof...(Types) > 0)>>
QString RequestKey(Types &&...values) {
	const auto strings = { details::ToString(values)... };
	if (strings.size() == 1) {
		return *strings.begin();
	}

	auto result = QString();
	result.reserve(
		ranges::accumulate(strings, 0, ranges::plus(), &QString::size));
	for (const auto &string : strings) {
		result.append(string);
	}
	return result;
}

class SelfDestruct;
class SensitiveContent;

} // namespace Api

class ApiWrap : public MTP::Sender, private base::Subscriber {
public:
	using SendAction = Api::SendAction;
	using MessageToSend = Api::MessageToSend;

	struct Privacy {
		enum class Key {
			PhoneNumber,
			AddedByPhone,
			LastSeen,
			Calls,
			Invites,
			CallsPeer2Peer,
			Forwards,
			ProfilePhoto,
		};
		enum class Option {
			Everyone,
			Contacts,
			Nobody,
		};
		Option option = Option::Everyone;
		std::vector<not_null<PeerData*>> always;
		std::vector<not_null<PeerData*>> never;

		static MTPInputPrivacyKey Input(Key key);
		static std::optional<Key> KeyFromMTP(mtpTypeId type);
	};

	struct BlockedUsersSlice {
		struct Item {
			UserData *user = nullptr;
			TimeId date = 0;

			bool operator==(const Item &other) const;
			bool operator!=(const Item &other) const;
		};

		QVector<Item> list;
		int total = 0;

		bool operator==(const BlockedUsersSlice &other) const;
		bool operator!=(const BlockedUsersSlice &other) const;
	};

	explicit ApiWrap(not_null<Main::Session*> session);
	~ApiWrap();

	Main::Session &session() const;

	void applyUpdates(
		const MTPUpdates &updates,
		uint64 sentMessageRandomId = 0);

	void registerModifyRequest(const QString &key, mtpRequestId requestId);
	void clearModifyRequest(const QString &key);

	void applyNotifySettings(
		MTPInputNotifyPeer peer,
		const MTPPeerNotifySettings &settings);

	void savePinnedOrder(Data::Folder *folder);
	void toggleHistoryArchived(
		not_null<History*> history,
		bool archived,
		Fn<void()> callback);
	//void ungroupAllFromFeed(not_null<Data::Feed*> feed); // #feed

	using RequestMessageDataCallback = Fn<void(ChannelData*, MsgId)>;
	void requestMessageData(
		ChannelData *channel,
		MsgId msgId,
		RequestMessageDataCallback callback);
	QString exportDirectMessageLink(not_null<HistoryItem*> item);

	void requestContacts();
	void requestDialogs(Data::Folder *folder = nullptr);
	void requestPinnedDialogs(Data::Folder *folder = nullptr);
	void requestMoreBlockedByDateDialogs();
	rpl::producer<bool> dialogsLoadMayBlockByDate() const;
	rpl::producer<bool> dialogsLoadBlockedByDate() const;

	void requestDialogEntry(not_null<Data::Folder*> folder);
	void requestDialogEntry(
		not_null<History*> history,
		Fn<void()> callback = nullptr);
	void dialogEntryApplied(not_null<History*> history);
	//void applyFeedSources(const MTPDchannels_feedSources &data); // #feed
	//void setFeedChannels(
	//	not_null<Data::Feed*> feed,
	//	const std::vector<not_null<ChannelData*>> &channels);
	void changeDialogUnreadMark(not_null<History*> history, bool unread);
	//void changeDialogUnreadMark(not_null<Data::Feed*> feed, bool unread); // #feed
	void requestFakeChatListMessage(not_null<History*> history);

	void requestWallPaper(
		const QString &slug,
		Fn<void(const Data::WallPaper &)> done,
		Fn<void(const RPCError &)> fail);

	void requestFullPeer(not_null<PeerData*> peer);
	void requestPeer(not_null<PeerData*> peer);
	void requestPeers(const QList<PeerData*> &peers);
	void requestPeerSettings(not_null<PeerData*> peer);
	void requestLastParticipants(not_null<ChannelData*> channel);
	void requestBots(not_null<ChannelData*> channel);
	void requestAdmins(not_null<ChannelData*> channel);
	void requestParticipantsCountDelayed(not_null<ChannelData*> channel);
	void requestChannelRangeDifference(not_null<History*> history);

	using UpdatedFileReferences = Data::UpdatedFileReferences;
	using FileReferencesHandler = FnMut<void(const UpdatedFileReferences&)>;
	void refreshFileReference(
		Data::FileOrigin origin,
		FileReferencesHandler &&handler);
	void refreshFileReference(
		Data::FileOrigin origin,
		not_null<Storage::DownloadMtprotoTask*> task,
		int requestId,
		const QByteArray &current);

	void requestChangelog(
		const QString &sinceVersion,
		Fn<void(const MTPUpdates &result)> callback);
	void refreshProxyPromotion();
	void requestDeepLinkInfo(
		const QString &path,
		Fn<void(const MTPDhelp_deepLinkInfo &result)> callback);
	void requestTermsUpdate();
	void acceptTerms(bytes::const_span termsId);

	void checkChatInvite(
		const QString &hash,
		FnMut<void(const MTPChatInvite &)> done,
		FnMut<void(const RPCError &)> fail);
	void importChatInvite(const QString &hash);

	void requestChannelMembersForAdd(
		not_null<ChannelData*> channel,
		Fn<void(const MTPchannels_ChannelParticipants&)> callback);
	void processFullPeer(
		not_null<PeerData*> peer,
		const MTPmessages_ChatFull &result);
	void processFullPeer(
		not_null<UserData*> user,
		const MTPUserFull &result);

	void migrateChat(
		not_null<ChatData*> chat,
		FnMut<void(not_null<ChannelData*>)> done,
		FnMut<void(const RPCError &)> fail = nullptr);

	void markMediaRead(const base::flat_set<not_null<HistoryItem*>> &items);
	void markMediaRead(not_null<HistoryItem*> item);

	void requestSelfParticipant(not_null<ChannelData*> channel);
	void kickParticipant(not_null<ChatData*> chat, not_null<UserData*> user);
	void kickParticipant(
		not_null<ChannelData*> channel,
		not_null<UserData*> user,
		const MTPChatBannedRights &currentRights);
	void unblockParticipant(
		not_null<ChannelData*> channel,
		not_null<UserData*> user);
	void deleteAllFromUser(
		not_null<ChannelData*> channel,
		not_null<UserData*> from);

	void requestWebPageDelayed(WebPageData *page);
	void clearWebPageRequest(WebPageData *page);
	void clearWebPageRequests();

	void requestAttachedStickerSets(not_null<PhotoData*> photo);
	void scheduleStickerSetRequest(uint64 setId, uint64 access);
	void requestStickerSets();
	void saveStickerSets(
		const Stickers::Order &localOrder,
		const Stickers::Order &localRemoved);
	void updateStickers();
	void requestRecentStickersForce();
	void setGroupStickerSet(
		not_null<ChannelData*> megagroup,
		const MTPInputStickerSet &set);
	std::vector<not_null<DocumentData*>> *stickersByEmoji(
		not_null<EmojiPtr> emoji);
	void toggleFavedSticker(
		not_null<DocumentData*> document,
		Data::FileOrigin origin,
		bool faved);
	void toggleSavedGif(
		not_null<DocumentData*> document,
		Data::FileOrigin origin,
		bool saved);

	void joinChannel(not_null<ChannelData*> channel);
	void leaveChannel(not_null<ChannelData*> channel);

	void blockUser(not_null<UserData*> user);
	void unblockUser(not_null<UserData*> user, Fn<void()> onDone = nullptr);

	void exportInviteLink(not_null<PeerData*> peer);
	void requestNotifySettings(const MTPInputNotifyPeer &peer);
	void updateNotifySettingsDelayed(not_null<const PeerData*> peer);
	void saveDraftToCloudDelayed(not_null<History*> history);

	void savePrivacy(
		const MTPInputPrivacyKey &key,
		QVector<MTPInputPrivacyRule> &&rules);
	void handlePrivacyChange(
		Privacy::Key key,
		const MTPVector<MTPPrivacyRule> &rules);
	static int OnlineTillFromStatus(
		const MTPUserStatus &status,
		int currentOnlineTill);

	void clearHistory(not_null<PeerData*> peer, bool revoke);
	void deleteConversation(not_null<PeerData*> peer, bool revoke);
	void deleteMessages(
		not_null<PeerData*> peer,
		const QVector<MTPint> &ids,
		bool revoke);

	base::Observable<PeerData*> &fullPeerUpdated() {
		return _fullPeerUpdated;
	}

	bool isQuitPrevent();

	void applyUpdatesNoPtsCheck(const MTPUpdates &updates);
	void applyUpdateNoPtsCheck(const MTPUpdate &update);

	void jumpToDate(Dialogs::Key chat, const QDate &date);

	void preloadEnoughUnreadMentions(not_null<History*> history);
	void checkForUnreadMentions(
		const base::flat_set<MsgId> &possiblyReadMentions,
		ChannelData *channel = nullptr);

	using SliceType = Data::LoadDirection;
	void requestSharedMedia(
		not_null<PeerData*> peer,
		Storage::SharedMediaType type,
		MsgId messageId,
		SliceType slice);
	void requestSharedMediaCount(
			not_null<PeerData*> peer,
			Storage::SharedMediaType type);

	void requestUserPhotos(
		not_null<UserData*> user,
		PhotoId afterId);

	//void requestFeedChannels( // #feed
	//	not_null<Data::Feed*> feed);
	//void requestFeedMessages(
	//	not_null<Data::Feed*> feed,
	//	Data::MessagePosition messageId,
	//	SliceType slice);
	//void saveDefaultFeedId(FeedId id, bool isDefaultFeedId);

	void stickerSetInstalled(uint64 setId) {
		_stickerSetInstalled.fire_copy(setId);
	}
	auto stickerSetInstalled() const {
		return _stickerSetInstalled.events();
	}
	void readFeaturedSetDelayed(uint64 setId);

	void parseChannelParticipants(
		not_null<ChannelData*> channel,
		const MTPchannels_ChannelParticipants &result,
		Fn<void(
			int availableCount,
			const QVector<MTPChannelParticipant> &list)> callbackList,
		Fn<void()> callbackNotModified = nullptr);
	void parseRecentChannelParticipants(
		not_null<ChannelData*> channel,
		const MTPchannels_ChannelParticipants &result,
		Fn<void(
			int availableCount,
			const QVector<MTPChannelParticipant> &list)> callbackList = nullptr,
		Fn<void()> callbackNotModified = nullptr);
	void addChatParticipants(
		not_null<PeerData*> peer,
		const std::vector<not_null<UserData*>> &users);


	rpl::producer<SendAction> sendActions() const {
		return _sendActions.events();
	}
	void sendAction(const SendAction &action);
	void forwardMessages(
		HistoryItemsList &&items,
		const SendAction &action,
		FnMut<void()> &&successCallback = nullptr);
	void shareContact(
		const QString &phone,
		const QString &firstName,
		const QString &lastName,
		const SendAction &action);
	void shareContact(not_null<UserData*> user, const SendAction &action);
	void readServerHistory(not_null<History*> history);
	void readServerHistoryForce(not_null<History*> history, MsgId upTo = 0);
	//void readFeed( // #feed
	//	not_null<Data::Feed*> feed,
	//	Data::MessagePosition position);

	void sendVoiceMessage(
		QByteArray result,
		VoiceWaveform waveform,
		int duration,
		const SendAction &action);
	void sendFiles(
		Storage::PreparedList &&list,
		SendMediaType type,
		TextWithTags &&caption,
		std::shared_ptr<SendingAlbum> album,
		const SendAction &action);
	void sendFile(
		const QByteArray &fileContent,
		SendMediaType type,
		const SendAction &action);

	void editMedia(
		Storage::PreparedList &&list,
		SendMediaType type,
		TextWithTags &&caption,
		const SendAction &action,
		MsgId msgIdToEdit);

	void sendUploadedPhoto(
		FullMsgId localId,
		const MTPInputFile &file,
		Api::SendOptions options);
	void sendUploadedDocument(
		FullMsgId localId,
		const MTPInputFile &file,
		const std::optional<MTPInputFile> &thumb,
		Api::SendOptions options);
	void editUploadedFile(
		FullMsgId localId,
		const MTPInputFile &file,
		const std::optional<MTPInputFile> &thumb,
		Api::SendOptions options,
		bool isDocument);

	void cancelLocalItem(not_null<HistoryItem*> item);

	void sendMessage(MessageToSend &&message);
	void sendBotStart(not_null<UserData*> bot, PeerData *chat = nullptr);
	void sendInlineResult(
		not_null<UserData*> bot,
		not_null<InlineBots::Result*> data,
		const SendAction &action);
	void sendMessageFail(
		const RPCError &error,
		not_null<PeerData*> peer,
		uint64 randomId = 0,
		FullMsgId itemId = FullMsgId());

	void uploadPeerPhoto(not_null<PeerData*> peer, QImage &&image);
	void clearPeerPhoto(not_null<PhotoData*> photo);

	void reloadPasswordState();
	void clearUnconfirmedPassword();
	rpl::producer<Core::CloudPasswordState> passwordState() const;
	std::optional<Core::CloudPasswordState> passwordStateCurrent() const;

	void reloadContactSignupSilent();
	rpl::producer<bool> contactSignupSilent() const;
	std::optional<bool> contactSignupSilentCurrent() const;
	void saveContactSignupSilent(bool silent);

	void saveSelfBio(const QString &text, FnMut<void()> done);

	void reloadPrivacy(Privacy::Key key);
	rpl::producer<Privacy> privacyValue(Privacy::Key key);

	void reloadBlockedUsers();
	rpl::producer<BlockedUsersSlice> blockedUsersSlice();

	[[nodiscard]] Api::SelfDestruct &selfDestruct();
	[[nodiscard]] Api::SensitiveContent &sensitiveContent();

	void createPoll(
		const PollData &data,
		const SendAction &action,
		FnMut<void()> done,
		FnMut<void(const RPCError &error)> fail);
	void sendPollVotes(
		FullMsgId itemId,
		const std::vector<QByteArray> &options);
	void closePoll(not_null<HistoryItem*> item);
	void reloadPollResults(not_null<HistoryItem*> item);

private:
	struct MessageDataRequest {
		using Callbacks = QList<RequestMessageDataCallback>;
		mtpRequestId requestId = 0;
		Callbacks callbacks;
	};
	using MessageDataRequests = QMap<MsgId, MessageDataRequest>;
	using SharedMediaType = Storage::SharedMediaType;

	struct StickersByEmoji {
		std::vector<not_null<DocumentData*>> list;
		int32 hash = 0;
		crl::time received = 0;
	};

	struct DialogsLoadState {
		TimeId offsetDate = 0;
		MsgId offsetId = 0;
		PeerData *offsetPeer = nullptr;
		mtpRequestId requestId = 0;
		bool listReceived = false;

		mtpRequestId pinnedRequestId = 0;
		bool pinnedReceived = false;
	};

	void setupSupportMode();
	void refreshDialogsLoadBlocked();
	void updateDialogsOffset(
		Data::Folder *folder,
		const QVector<MTPDialog> &dialogs,
		const QVector<MTPMessage> &messages);
	void requestMoreDialogs(Data::Folder *folder);
	DialogsLoadState *dialogsLoadState(Data::Folder *folder);
	void dialogsLoadFinish(Data::Folder *folder);

	void checkQuitPreventFinished();

	void saveDraftsToCloud();

	void resolveMessageDatas();
	void gotMessageDatas(ChannelData *channel, const MTPmessages_Messages &result, mtpRequestId requestId);
	void finalizeMessageDataRequest(
		ChannelData *channel,
		mtpRequestId requestId);

	QVector<MTPInputMessage> collectMessageIds(const MessageDataRequests &requests);
	MessageDataRequests *messageDataRequests(ChannelData *channel, bool onlyExisting = false);
	void applyPeerDialogs(const MTPmessages_PeerDialogs &dialogs);

	void gotChatFull(
		not_null<PeerData*> peer,
		const MTPmessages_ChatFull &result,
		mtpRequestId req);
	void gotUserFull(
		not_null<UserData*> user,
		const MTPUserFull &result,
		mtpRequestId req);
	void applyLastParticipantsList(
		not_null<ChannelData*> channel,
		int availableCount,
		const QVector<MTPChannelParticipant> &list);
	void applyBotsList(
		not_null<ChannelData*> channel,
		int availableCount,
		const QVector<MTPChannelParticipant> &list);
	void resolveWebPages();
	void gotWebPages(
		ChannelData *channel,
		const MTPmessages_Messages &result,
		mtpRequestId req);
	void gotStickerSet(uint64 setId, const MTPmessages_StickerSet &result);

	void channelRangeDifferenceSend(
		not_null<ChannelData*> channel,
		MsgRange range,
		int32 pts);
	void channelRangeDifferenceDone(
		not_null<ChannelData*> channel,
		MsgRange range,
		const MTPupdates_ChannelDifference &result);

	void stickerSetDisenabled(mtpRequestId requestId);
	void stickersSaveOrder();

	void requestStickers(TimeId now);
	void requestRecentStickers(TimeId now);
	void requestRecentStickersWithHash(int32 hash);
	void requestFavedStickers(TimeId now);
	void requestFeaturedStickers(TimeId now);
	void requestSavedGifs(TimeId now);
	void readFeaturedSets();

	void refreshChannelAdmins(
		not_null<ChannelData*> channel,
		const QVector<MTPChannelParticipant> &participants);

	void jumpToHistoryDate(not_null<PeerData*> peer, const QDate &date);
	//void jumpToFeedDate(not_null<Data::Feed*> feed, const QDate &date); // #feed
	template <typename Callback>
	void requestMessageAfterDate(
		not_null<PeerData*> peer,
		const QDate &date,
		Callback &&callback);
	//template <typename Callback> // #feed
	//void requestMessageAfterDate(
	//	not_null<Data::Feed*> feed,
	//	const QDate &date,
	//	Callback &&callback);

	void sharedMediaDone(
		not_null<PeerData*> peer,
		SharedMediaType type,
		MsgId messageId,
		SliceType slice,
		const MTPmessages_Messages &result);

	void userPhotosDone(
		not_null<UserData*> user,
		PhotoId photoId,
		const MTPphotos_Photos &result);

	//void feedChannelsDone(not_null<Data::Feed*> feed); // #feed
	//void feedMessagesDone(
	//	not_null<Data::Feed*> feed,
	//	Data::MessagePosition messageId,
	//	SliceType slice,
	//	const MTPmessages_FeedMessages &result);

	void sendSharedContact(
		const QString &phone,
		const QString &firstName,
		const QString &lastName,
		UserId userId,
		const SendAction &action);

	void deleteHistory(
		not_null<PeerData*> peer,
		bool justClear,
		bool revoke);
	void sendReadRequest(not_null<PeerData*> peer, MsgId upTo);
	int applyAffectedHistory(
		not_null<PeerData*> peer,
		const MTPmessages_AffectedHistory &result);
	void applyAffectedMessages(const MTPmessages_AffectedMessages &result);
	void applyAffectedMessages(
		not_null<PeerData*> peer,
		const MTPmessages_AffectedMessages &result);

	void deleteAllFromUserSend(
		not_null<ChannelData*> channel,
		not_null<UserData*> from);

	void uploadAlbumMedia(
		not_null<HistoryItem*> item,
		const MessageGroupId &groupId,
		const MTPInputMedia &media);
	void sendAlbumWithUploaded(
		not_null<HistoryItem*> item,
		const MessageGroupId &groupId,
		const MTPInputMedia &media);
	void sendAlbumWithCancelled(
		not_null<HistoryItem*> item,
		const MessageGroupId &groupId);
	void sendAlbumIfReady(not_null<SendingAlbum*> album);
	void sendMedia(
		not_null<HistoryItem*> item,
		const MTPInputMedia &media,
		Api::SendOptions options);
	void sendMediaWithRandomId(
		not_null<HistoryItem*> item,
		const MTPInputMedia &media,
		Api::SendOptions options,
		uint64 randomId);
	FileLoadTo fileLoadTaskOptions(const SendAction &action) const;

	//void readFeeds(); // #feed

	void getProxyPromotionDelayed(TimeId now, TimeId next);
	void proxyPromotionDone(const MTPhelp_ProxyData &proxy);

	void sendNotifySettingsUpdates();

	template <typename Request>
	void requestFileReference(
		Data::FileOrigin origin,
		FileReferencesHandler &&handler,
		Request &&data);

	void photoUploadReady(const FullMsgId &msgId, const MTPInputFile &file);

	Privacy parsePrivacy(const QVector<MTPPrivacyRule> &rules);
	void pushPrivacy(
		Privacy::Key key,
		const QVector<MTPPrivacyRule> &rules);
	void updatePrivacyLastSeens(const QVector<MTPPrivacyRule> &rules);

	void migrateDone(
		not_null<PeerData*> peer,
		not_null<ChannelData*> channel);
	void migrateFail(not_null<PeerData*> peer, const RPCError &error);

	void sendDialogRequests();

	not_null<Main::Session*> _session;

	base::flat_map<QString, int> _modifyRequests;

	MessageDataRequests _messageDataRequests;
	QMap<ChannelData*, MessageDataRequests> _channelMessageDataRequests;
	SingleQueuedInvokation _messageDataResolveDelayed;

	using PeerRequests = QMap<PeerData*, mtpRequestId>;
	PeerRequests _fullPeerRequests;
	PeerRequests _peerRequests;
	base::flat_set<not_null<PeerData*>> _requestedPeerSettings;

	PeerRequests _participantsRequests;
	PeerRequests _botsRequests;
	PeerRequests _adminsRequests;
	base::DelayedCallTimer _participantsCountRequestTimer;

	ChannelData *_channelMembersForAdd = nullptr;
	mtpRequestId _channelMembersForAddRequestId = 0;
	Fn<void(
		const MTPchannels_ChannelParticipants&)> _channelMembersForAddCallback;
	base::flat_map<
		not_null<History*>,
		std::pair<mtpRequestId,Fn<void()>>> _historyArchivedRequests;

	using KickRequest = std::pair<
		not_null<ChannelData*>,
		not_null<UserData*>>;
	base::flat_map<KickRequest, mtpRequestId> _kickRequests;

	base::flat_set<not_null<ChannelData*>> _selfParticipantRequests;

	base::flat_map<
		not_null<ChannelData*>,
		mtpRequestId> _rangeDifferenceRequests;

	QMap<WebPageData*, mtpRequestId> _webPagesPending;
	base::Timer _webPagesTimer;

	QMap<uint64, QPair<uint64, mtpRequestId> > _stickerSetRequests;

	QMap<ChannelData*, mtpRequestId> _channelAmInRequests;
	base::flat_map<not_null<UserData*>, mtpRequestId> _blockRequests;
	base::flat_map<not_null<PeerData*>, mtpRequestId> _exportInviteRequests;
	base::flat_map<PeerId, mtpRequestId> _notifySettingRequests;
	base::flat_map<not_null<History*>, mtpRequestId> _draftsSaveRequestIds;
	base::Timer _draftsSaveTimer;

	base::flat_set<mtpRequestId> _stickerSetDisenableRequests;
	Stickers::Order _stickersOrder;
	mtpRequestId _stickersReorderRequestId = 0;
	mtpRequestId _stickersClearRecentRequestId = 0;

	mtpRequestId _stickersUpdateRequest = 0;
	mtpRequestId _recentStickersUpdateRequest = 0;
	mtpRequestId _favedStickersUpdateRequest = 0;
	mtpRequestId _featuredStickersUpdateRequest = 0;
	mtpRequestId _savedGifsUpdateRequest = 0;

	base::Timer _featuredSetsReadTimer;
	base::flat_set<uint64> _featuredSetsRead;

	base::flat_map<not_null<EmojiPtr>, StickersByEmoji> _stickersByEmoji;

	base::flat_map<mtpTypeId, mtpRequestId> _privacySaveRequests;

	mtpRequestId _contactsRequestId = 0;
	mtpRequestId _contactsStatusesRequestId = 0;
	base::flat_set<not_null<Data::Folder*>> _dialogFolderRequests;
	base::flat_map<
		not_null<History*>,
		std::vector<Fn<void()>>> _dialogRequests;
	base::flat_map<
		not_null<History*>,
		std::vector<Fn<void()>>> _dialogRequestsPending;
	base::flat_set<not_null<History*>> _fakeChatListRequests;

	base::flat_map<not_null<History*>, mtpRequestId> _unreadMentionsRequests;

	base::flat_map<std::tuple<
		not_null<PeerData*>,
		SharedMediaType,
		MsgId,
		SliceType>, mtpRequestId> _sharedMediaRequests;

	base::flat_map<not_null<UserData*>, mtpRequestId> _userPhotosRequests;

	//base::flat_set<not_null<Data::Feed*>> _feedChannelsGetRequests; // #feed
	//base::flat_map<
	//	not_null<Data::Feed*>,
	//	mtpRequestId> _feedChannelsSetRequests;
	//base::flat_set<std::tuple<
	//	not_null<Data::Feed*>,
	//	Data::MessagePosition,
	//	SliceType>> _feedMessagesRequests;
	//base::flat_set<std::tuple<
	//	not_null<Data::Feed*>,
	//	Data::MessagePosition,
	//	SliceType>> _feedMessagesRequestsPending;
	//mtpRequestId _saveDefaultFeedIdRequest = 0;

	std::unique_ptr<DialogsLoadState> _dialogsLoadState;
	TimeId _dialogsLoadTill = 0;
	rpl::variable<bool> _dialogsLoadMayBlockByDate = false;
	rpl::variable<bool> _dialogsLoadBlockedByDate = false;

	base::flat_map<
		not_null<Data::Folder*>,
		DialogsLoadState> _foldersLoadState;

	rpl::event_stream<SendAction> _sendActions;

	struct ReadRequest {
		ReadRequest(mtpRequestId requestId, MsgId upTo)
		: requestId(requestId)
		, upTo(upTo) {
		}

		mtpRequestId requestId = 0;
		MsgId upTo = 0;
	};
	base::flat_map<not_null<PeerData*>, ReadRequest> _readRequests;
	base::flat_map<not_null<PeerData*>, MsgId> _readRequestsPending;

	std::unique_ptr<TaskQueue> _fileLoader;
	base::flat_map<uint64, std::shared_ptr<SendingAlbum>> _sendingAlbums;

	base::Observable<PeerData*> _fullPeerUpdated;

	rpl::event_stream<uint64> _stickerSetInstalled;

	// #feed
	//base::flat_map<not_null<Data::Feed*>, crl::time> _feedReadsDelayed;
	//base::flat_map<not_null<Data::Feed*>, mtpRequestId> _feedReadRequests;
	//base::Timer _feedReadTimer;

	mtpRequestId _proxyPromotionRequestId = 0;
	std::pair<QString, uint32> _proxyPromotionKey;
	TimeId _proxyPromotionNextRequestTime = TimeId(0);
	base::Timer _proxyPromotionTimer;

	base::flat_set<not_null<const PeerData*>> _updateNotifySettingsPeers;
	base::Timer _updateNotifySettingsTimer;

	std::map<
		Data::FileOrigin,
		std::vector<FileReferencesHandler>> _fileReferenceHandlers;

	mtpRequestId _deepLinkInfoRequestId = 0;

	crl::time _termsUpdateSendAt = 0;
	mtpRequestId _termsUpdateRequestId = 0;

	mtpRequestId _checkInviteRequestId = 0;
	FnMut<void(const MTPChatInvite &result)> _checkInviteDone;
	FnMut<void(const RPCError &error)> _checkInviteFail;

	struct MigrateCallbacks {
		FnMut<void(not_null<ChannelData*>)> done;
		FnMut<void(const RPCError&)> fail;
	};
	base::flat_map<
		not_null<PeerData*>,
		std::vector<MigrateCallbacks>> _migrateCallbacks;

	std::vector<FnMut<void(const MTPUser &)>> _supportContactCallbacks;

	base::flat_map<FullMsgId, not_null<PeerData*>> _peerPhotoUploads;

	mtpRequestId _passwordRequestId = 0;
	std::unique_ptr<Core::CloudPasswordState> _passwordState;
	rpl::event_stream<Core::CloudPasswordState> _passwordStateChanges;

	mtpRequestId _saveBioRequestId = 0;
	FnMut<void()> _saveBioDone;
	QString _saveBioText;

	base::flat_map<Privacy::Key, mtpRequestId> _privacyRequestIds;
	base::flat_map<Privacy::Key, Privacy> _privacyValues;
	std::map<Privacy::Key, rpl::event_stream<Privacy>> _privacyChanges;

	mtpRequestId _blockedUsersRequestId = 0;
	std::optional<BlockedUsersSlice> _blockedUsersSlice;
	rpl::event_stream<BlockedUsersSlice> _blockedUsersChanges;

	const std::unique_ptr<Api::SelfDestruct> _selfDestruct;
	const std::unique_ptr<Api::SensitiveContent> _sensitiveContent;

	base::flat_map<FullMsgId, mtpRequestId> _pollVotesRequestIds;
	base::flat_map<FullMsgId, mtpRequestId> _pollCloseRequestIds;
	base::flat_map<FullMsgId, mtpRequestId> _pollReloadRequestIds;

	mtpRequestId _wallPaperRequestId = 0;
	QString _wallPaperSlug;
	Fn<void(const Data::WallPaper &)> _wallPaperDone;
	Fn<void(const RPCError &)> _wallPaperFail;

	mtpRequestId _contactSignupSilentRequestId = 0;
	std::optional<bool> _contactSignupSilent;
	rpl::event_stream<bool> _contactSignupSilentChanges;

	mtpRequestId _attachedStickerSetsRequestId = 0;

	base::flat_map<FullMsgId, QString> _unlikelyMessageLinks;

};