Receive and track recent sticker usage date.

Telegram/SourceFiles/apiwrap.cpp

@@ -1397,7 +1397,9 @@ void ApiWrap::saveStickerSets(
 				writeRecent = true;
 			}
 
-			_stickersClearRecentRequestId = request(MTPmessages_ClearRecentStickers(MTP_flags(0))).done([this](const MTPBool &result) {
+			_stickersClearRecentRequestId = request(MTPmessages_ClearRecentStickers(
+				MTP_flags(0)
+			)).done([this](const MTPBool &result) {
 				_stickersClearRecentRequestId = 0;
 			}).fail([this](const RPCError &error) {
 				_stickersClearRecentRequestId = 0;
@@ -2301,7 +2303,8 @@ void ApiWrap::requestRecentStickers(TimeId now) {
 				lang(lng_recent_stickers),
 				d.vstickers.v,
 				d.vhash.v,
-				d.vpacks.v);
+				d.vpacks.v,
+				d.vdates.v);
 		} return;
 		default: Unexpected("Type in ApiWrap::recentStickersDone()");
 		}

Telegram/SourceFiles/chat_helpers/stickers.cpp

@@ -405,8 +405,13 @@ void SetsReceived(const QVector<MTPStickerSet> &data, int32 hash) {
 	Auth().data().notifyStickersUpdated();
 }
 
-void SetPackAndEmoji(Set &set, Pack &&pack, const QVector<MTPStickerPack> &packs) {
+void SetPackAndEmoji(
+		Set &set,
+		Pack &&pack,
+		const std::vector<TimeId> &&dates,
+		const QVector<MTPStickerPack> &packs) {
 	set.stickers = std::move(pack);
+	set.dates = std::move(dates);
 	set.emoji.clear();
 	for_const (auto &mtpPack, packs) {
 		Assert(mtpPack.type() == mtpc_stickerPack);
@@ -433,12 +438,12 @@ void SpecialSetReceived(
 		const QString &setTitle,
 		const QVector<MTPDocument> &items,
 		int32 hash,
-		const QVector<MTPStickerPack> &packs) {
+		const QVector<MTPStickerPack> &packs,
+		const QVector<MTPint> &usageDates) {
 	auto &sets = Auth().data().stickerSetsRef();
 	auto it = sets.find(setId);
 
-	auto &d_docs = items;
+	if (items.isEmpty()) {
-	if (d_docs.isEmpty()) {
 		if (it != sets.cend()) {
 			sets.erase(it);
 		}
@@ -458,14 +463,22 @@ void SpecialSetReceived(
 		}
 		it->hash = hash;
 
+		auto dates = std::vector<TimeId>();
+		auto dateIndex = 0;
+		auto datesAvailable = (items.size() == usageDates.size());
+
 		auto custom = sets.find(CustomSetId);
 		auto pack = Pack();
-		pack.reserve(d_docs.size());
+		pack.reserve(items.size());
-		for_const (auto &mtpDocument, d_docs) {
+		for_const (auto &mtpDocument, items) {
+			const auto date = datesAvailable
+				? TimeId(usageDates[dateIndex++].v)
+				: TimeId();
 			auto document = Auth().data().document(mtpDocument);
 			if (!document->sticker()) continue;
 
 			pack.push_back(document);
+			dates.push_back(date);
 			if (custom != sets.cend()) {
 				auto index = custom->stickers.indexOf(document);
 				if (index >= 0) {
@@ -492,7 +505,7 @@ void SpecialSetReceived(
 		if (pack.isEmpty()) {
 			sets.erase(it);
 		} else {
-			SetPackAndEmoji(*it, std::move(pack), packs);
+			SetPackAndEmoji(*it, std::move(pack), std::move(dates), packs);
 		}
 
 		if (writeRecent) {

Telegram/SourceFiles/chat_helpers/stickers.h

@@ -52,6 +52,7 @@ struct Set {
 	MTPDstickerSet::Flags flags;
 	TimeId installDate = 0;
 	Pack stickers;
+	std::vector<TimeId> dates;
 	Pack covers;
 	ByEmojiMap emoji;
 };
@@ -77,7 +78,8 @@ void SpecialSetReceived(
 	const QString &setTitle,
 	const QVector<MTPDocument> &items,
 	int32 hash,
-	const QVector<MTPStickerPack> &packs = QVector<MTPStickerPack>());
+	const QVector<MTPStickerPack> &packs = QVector<MTPStickerPack>(),
+	const QVector<MTPint> &usageDates = QVector<MTPint>());
 void FeaturedSetsReceived(
 	const QVector<MTPStickerSetCovered> &data,
 	const QVector<MTPlong> &unread,

Telegram/SourceFiles/mainwidget.cpp

@@ -4060,9 +4060,16 @@ void MainWidget::incrementSticker(DocumentData *sticker) {
 	}
 	auto index = it->stickers.indexOf(sticker);
 	if (index > 0) {
+		if (!it->dates.empty()) {
+			Assert(it->dates.size() == it->stickers.size());
+			it->dates.erase(it->dates.begin() + index);
+		}
 		it->stickers.removeAt(index);
 	}
 	if (index) {
+		if (it->dates.size() == it->stickers.size()) {
+			it->dates.insert(it->dates.begin(), unixtime());
+		}
 		it->stickers.push_front(sticker);
 		writeRecentStickers = true;
 	}

Telegram/SourceFiles/storage/localstorage.cpp

@@ -3216,6 +3216,15 @@ void _writeStickerSet(QDataStream &stream, const Stickers::Set &set) {
 	for (auto j = set.stickers.cbegin(), e = set.stickers.cend(); j != e; ++j) {
 		Serialize::Document::writeToStream(stream, *j);
 	}
+	if (AppVersion > 1002008) {
+		stream << qint32(set.dates.size());
+		if (!set.dates.empty()) {
+			Assert(set.dates.size() == set.stickers.size());
+			for (const auto date : set.dates) {
+				stream << qint32(date);
+			}
+		}
+	}
 
 	if (AppVersion > 9018) {
 		stream << qint32(set.emoji.size());
@@ -3267,6 +3276,11 @@ void _writeStickerSets(FileKey &stickersKey, CheckSet checkSet, const Stickers::
 		for_const (auto &sticker, set.stickers) {
 			size += Serialize::Document::sizeInStream(sticker);
 		}
+		size += sizeof(qint32); // dates count
+		if (!set.dates.empty()) {
+			Assert(set.stickers.size() == set.dates.size());
+			size += set.dates.size() * sizeof(qint32);
+		}
 
 		size += sizeof(qint32); // emojiCount
 		for (auto j = set.emoji.cbegin(), e = set.emoji.cend(); j != e; ++j) {
@@ -3432,6 +3446,23 @@ void _readStickerSets(FileKey &stickersKey, Stickers::Order *outOrder = nullptr,
 			}
 		}
 
+		if (stickers.version > 1002008) {
+			auto datesCount = qint32(0);
+			stickers.stream >> datesCount;
+			if (datesCount > 0) {
+				if (datesCount != scnt) {
+					// Bad file.
+					return;
+				}
+				set.dates.reserve(datesCount);
+				for (auto i = 0; i != datesCount; ++i) {
+					auto date = qint32();
+					stickers.stream >> date;
+					set.dates.push_back(TimeId(date));
+				}
+			}
+		}
+
 		if (stickers.version > 9018) {
 			qint32 emojiCount;
 			stickers.stream >> emojiCount;

Telegram/SourceFiles/storage/serialize_document.cpp

@@ -82,7 +82,10 @@ DocumentData *Document::readFromStreamHelper(int streamAppVersion, QDataStream &
 		if (typeOfSet == StickerSetTypeEmpty) {
 			attributes.push_back(MTP_documentAttributeSticker(MTP_flags(0), MTP_string(alt), MTP_inputStickerSetEmpty(), MTPMaskCoords()));
 		} else if (info) {
-			if (info->setId == Stickers::DefaultSetId || info->setId == Stickers::CloudRecentSetId || info->setId == Stickers::FavedSetId || info->setId == Stickers::CustomSetId) {
+			if (info->setId == Stickers::DefaultSetId
+				|| info->setId == Stickers::CloudRecentSetId
+				|| info->setId == Stickers::FavedSetId
+				|| info->setId == Stickers::CustomSetId) {
 				typeOfSet = StickerSetTypeEmpty;
 			}