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Telegram/SourceFiles/data/data_saved_messages.h

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+/*
+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 "dialogs/dialogs_main_list.h"
+
+namespace Dialogs {
+struct UnreadState;
+} // namespace Dialogs
+
+namespace Main {
+class Session;
+} // namespace Main
+
+namespace Data {
+
+class Session;
+class SavedSublist;
+
+struct SavedMessagesOffsets {
+	TimeId date = 0;
+	MsgId id = 0;
+	PeerData *peer = nullptr;
+
+	friend inline constexpr auto operator<=>(
+		SavedMessagesOffsets,
+		SavedMessagesOffsets) = default;
+};
+
+class SavedMessages final {
+public:
+	explicit SavedMessages(
+		not_null<Session*> owner,
+		ChannelData *parentChat = nullptr);
+	~SavedMessages();
+
+	[[nodiscard]] bool supported() const;
+	void markUnsupported();
+
+	[[nodiscard]] ChannelData *parentChat() const;
+	[[nodiscard]] not_null<History*> owningHistory() const;
+
+	[[nodiscard]] Session &owner() const;
+	[[nodiscard]] Main::Session &session() const;
+
+	[[nodiscard]] not_null<Dialogs::MainList*> chatsList();
+	[[nodiscard]] not_null<SavedSublist*> sublist(not_null<PeerData*> peer);
+	[[nodiscard]] SavedSublist *sublistLoaded(not_null<PeerData*> peer);
+	void requestSublist(not_null<PeerData*> peer, Fn<void()> done = nullptr);
+
+	[[nodiscard]] rpl::producer<> chatsListChanges() const;
+	[[nodiscard]] rpl::producer<> chatsListLoadedEvents() const;
+
+	[[nodiscard]] rpl::producer<> destroyed() const;
+	[[nodiscard]] auto sublistDestroyed() const
+		-> rpl::producer<not_null<SavedSublist*>>;
+
+	void preloadSublists();
+	void loadMore();
+	void clearAllUnreadReactions();
+
+	void apply(const MTPDupdatePinnedSavedDialogs &update);
+	void apply(const MTPDupdateSavedDialogPinned &update);
+	void applySublistDeleted(not_null<PeerData*> sublistPeer);
+
+	void listMessageChanged(HistoryItem *from, HistoryItem *to);
+	[[nodiscard]] int recentSublistsListVersion() const;
+	void recentSublistsInvalidate(not_null<SavedSublist*> sublist);
+	[[nodiscard]] auto recentSublists() const
+		-> const std::vector<not_null<SavedSublist*>> &;
+
+	void markUnreadCountsUnknown(MsgId readTillId);
+	void updateUnreadCounts(
+		MsgId readTillId,
+		const base::flat_map<not_null<SavedSublist*>, int> &counts);
+
+	void clear();
+
+	void saveActiveSubsectionThread(not_null<Thread*> thread);
+	Thread *activeSubsectionThread() const;
+
+	[[nodiscard]] rpl::lifetime &lifetime();
+
+private:
+	struct SublistRequest {
+		mtpRequestId id = 0;
+		std::vector<Fn<void()>> callbacks;
+	};
+	struct ApplyResult {
+		SavedMessagesOffsets offset;
+		bool allLoaded = false;
+	};
+
+	void loadPinned();
+	ApplyResult applyReceivedSublists(
+		const MTPmessages_SavedDialogs &result,
+		SavedMessagesOffsets &updateOffsets);
+	ApplyResult applyReceivedSublists(
+		const MTPmessages_SavedDialogs &result,
+		bool pinned = false);
+
+	void reorderLastSublists();
+	void requestSomeStale();
+	void finishSublistRequest(not_null<PeerData*> peer);
+
+	void sendLoadMore();
+	void sendLoadMoreRequests();
+
+	const not_null<Session*> _owner;
+	ChannelData *_parentChat = nullptr;
+	History *_owningHistory = nullptr;
+
+	rpl::event_stream<not_null<SavedSublist*>> _sublistDestroyed;
+
+	Dialogs::MainList _chatsList;
+	base::flat_map<
+		not_null<PeerData*>,
+		std::unique_ptr<SavedSublist>> _sublists;
+	base::flat_map<not_null<PeerData*>, SublistRequest> _sublistRequests;
+	base::flat_set<not_null<PeerData*>> _stalePeers;
+	mtpRequestId _staleRequestId = 0;
+
+	mtpRequestId _loadMoreRequestId = 0;
+	mtpRequestId _pinnedRequestId = 0;
+
+	SavedMessagesOffsets _offset;
+
+	SingleQueuedInvokation _loadMore;
+	bool _loadMoreScheduled = false;
+
+	std::vector<not_null<SavedSublist*>> _lastSublists;
+	int _lastSublistsVersion = 0;
+
+	rpl::event_stream<> _chatsListChanges;
+	rpl::event_stream<> _chatsListLoadedEvents;
+
+	SavedSublist *_activeSubsectionSublist = nullptr;
+
+	bool _pinnedLoaded = false;
+	bool _unsupported = false;
+
+	rpl::lifetime _lifetime;
+
+};
+
+} // namespace Data