From 6cfbccd955d959029b3d0dbe96ee502dc67e4eb4 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Mon, 23 Dec 2024 16:09:37 +0400
Subject: [PATCH] Handle report_delivery_until_date.

---
 Telegram/SourceFiles/data/data_histories.cpp  | 53 +++++++++++++++++++
 Telegram/SourceFiles/data/data_histories.h    |  7 +++
 Telegram/SourceFiles/history/history_item.cpp |  7 +++
 3 files changed, 67 insertions(+)

diff --git a/Telegram/SourceFiles/data/data_histories.cpp b/Telegram/SourceFiles/data/data_histories.cpp
index f68eed90e9..e9b0b02575 100644
--- a/Telegram/SourceFiles/data/data_histories.cpp
+++ b/Telegram/SourceFiles/data/data_histories.cpp
@@ -32,6 +32,7 @@ namespace Data {
 namespace {
 
 constexpr auto kReadRequestTimeout = 3 * crl::time(1000);
+constexpr auto kReportDeliveriesPerRequest = 50;
 
 } // namespace
 
@@ -566,6 +567,58 @@ void Histories::sendPendingReadInbox(not_null<History*> history) {
 	}
 }
 
+void Histories::reportDelivery(not_null<HistoryItem*> item) {
+	auto &set = _pendingDeliveryReport[item->history()->peer];
+	if (!set.emplace(item->id).second) {
+		return;
+	}
+	crl::on_main(&session(), [=] {
+		reportPendingDeliveries();
+	});
+}
+
+void Histories::reportPendingDeliveries() {
+	auto &pending = _pendingDeliveryReport;
+	for (auto i = begin(pending); i != end(pending);) {
+		auto &[peer, ids] = *i;
+		auto list = QVector<MTPint>();
+		if (_deliveryReportSent.contains(peer)) {
+			++i;
+			continue;
+		} else if (ids.size() > kReportDeliveriesPerRequest) {
+			const auto count = kReportDeliveriesPerRequest;
+			list.reserve(count);
+			for (auto j = begin(ids), till = j + count; j != till; ++j) {
+				list.push_back(MTP_int(*j));
+			}
+			ids.erase(begin(ids), begin(ids) + count);
+		} else if (!ids.empty()) {
+			list.reserve(ids.size());
+			for (const auto &id : ids) {
+				list.push_back(MTP_int(id));
+			}
+			ids.clear();
+		}
+		if (ids.empty()) {
+			i = pending.erase(i);
+		} else {
+			++i;
+		}
+		_deliveryReportSent.emplace(peer);
+		const auto finish = [=] {
+			_deliveryReportSent.remove(peer);
+			if (_pendingDeliveryReport.contains(peer)) {
+				reportPendingDeliveries();
+			}
+		};
+		session().api().request(MTPmessages_ReportMessagesDelivery(
+			MTP_flags(0),
+			peer->input,
+			MTP_vector(std::move(list))
+		)).done(finish).fail(finish).send();
+	}
+}
+
 void Histories::sendReadRequests() {
 	DEBUG_LOG(("Reading: send requests with count %1.").arg(_states.size()));
 	if (_states.empty()) {
diff --git a/Telegram/SourceFiles/data/data_histories.h b/Telegram/SourceFiles/data/data_histories.h
index dd2900a41c..eb8645c5a6 100644
--- a/Telegram/SourceFiles/data/data_histories.h
+++ b/Telegram/SourceFiles/data/data_histories.h
@@ -63,6 +63,7 @@ public:
 	void readInboxOnNewMessage(not_null<HistoryItem*> item);
 	void readClientSideMessage(not_null<HistoryItem*> item);
 	void sendPendingReadInbox(not_null<History*> history);
+	void reportDelivery(not_null<HistoryItem*> item);
 
 	void requestDialogEntry(not_null<Data::Folder*> folder);
 	void requestDialogEntry(
@@ -201,6 +202,7 @@ private:
 	void postponeRequestDialogEntries();
 
 	void sendDialogRequests();
+	void reportPendingDeliveries();
 
 	[[nodiscard]] bool isCreatingTopic(
 		not_null<History*> history,
@@ -236,6 +238,11 @@ private:
 	base::flat_map<FullMsgId, MsgId> _createdTopicIds;
 	base::flat_set<mtpRequestId> _creatingTopicRequests;
 
+	base::flat_map<
+		not_null<PeerData*>,
+		base::flat_set<MsgId>> _pendingDeliveryReport;
+	base::flat_set<not_null<PeerData*>> _deliveryReportSent;
+
 };
 
 } // namespace Data
diff --git a/Telegram/SourceFiles/history/history_item.cpp b/Telegram/SourceFiles/history/history_item.cpp
index 69be637cef..816f69e64a 100644
--- a/Telegram/SourceFiles/history/history_item.cpp
+++ b/Telegram/SourceFiles/history/history_item.cpp
@@ -59,6 +59,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_channel.h"
 #include "data/data_chat.h"
 #include "data/data_game.h"
+#include "data/data_histories.h"
 #include "data/data_history_messages.h"
 #include "data/data_user.h"
 #include "data/data_group_call.h" // Data::GroupCall::id().
@@ -449,6 +450,12 @@ HistoryItem::HistoryItem(
 			Get<HistoryMessageFactcheck>()->data = check;
 		}
 	}
+
+	if (const auto until = data.vreport_delivery_until_date()) {
+		if (base::unixtime::now() < TimeId(until->v)) {
+			history->owner().histories().reportDelivery(this);
+		}
+	}
 }
 
 HistoryItem::HistoryItem(