From 177a7eaf43d387add3a374692aa01af4972fdb0a Mon Sep 17 00:00:00 2001
From: 23rd <23rd@vivaldi.net>
Date: Wed, 26 Apr 2023 23:58:03 +0300
Subject: [PATCH] Added initial serialization from TL data to statistics data.

---
 Telegram/SourceFiles/api/api_statistics.cpp | 78 ++++++++++++++++++++-
 Telegram/SourceFiles/api/api_statistics.h   |  8 ++-
 2 files changed, 81 insertions(+), 5 deletions(-)

diff --git a/Telegram/SourceFiles/api/api_statistics.cpp b/Telegram/SourceFiles/api/api_statistics.cpp
index 839fa98fd..62cdf05b4 100644
--- a/Telegram/SourceFiles/api/api_statistics.cpp
+++ b/Telegram/SourceFiles/api/api_statistics.cpp
@@ -8,20 +8,92 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "api/api_statistics.h"
 
 #include "apiwrap.h"
+#include "data/data_channel.h"
 #include "data/data_peer.h"
 #include "main/main_session.h"
 
 namespace Api {
 namespace {
+
+[[nodiscard]] Data::StatisticalValue StatisticalValueFromTL(
+		const MTPStatsAbsValueAndPrev &tl) {
+	const auto current = tl.data().vcurrent().v;
+	const auto previous = tl.data().vprevious().v;
+	return Data::StatisticalValue{
+		.value = current,
+		.previousValue = previous,
+		.growthRatePercentage = previous
+			? std::abs((current - previous) / float64(previous) * 100.)
+			: 0,
+	};
+}
+
+[[nodiscard]] Data::ChannelStatistics ChannelStatisticsFromTL(
+		const MTPDstats_broadcastStats &data) {
+	const auto &tlUnmuted = data.venabled_notifications().data();
+	const auto unmuted = (!tlUnmuted.vtotal().v)
+		? 0.
+		: std::clamp(
+			tlUnmuted.vpart().v / tlUnmuted.vtotal().v * 100.,
+			0.,
+			100.);
+	using Recent = MTPMessageInteractionCounters;
+	auto recentMessages = ranges::views::all(
+		data.vrecent_message_interactions().v
+	) | ranges::views::transform([&](const Recent &tl) {
+		return Data::StatisticsMessageInteractionInfo{
+			.messageId = tl.data().vmsg_id().v,
+			.viewsCount = tl.data().vviews().v,
+			.forwardsCount = tl.data().vforwards().v,
+		};
+	}) | ranges::to_vector;
+	return {
+		.startDate = data.vperiod().data().vmin_date().v,
+		.endDate = data.vperiod().data().vmax_date().v,
+
+		.memberCount = StatisticalValueFromTL(data.vfollowers()),
+		.meanViewCount = StatisticalValueFromTL(data.vviews_per_post()),
+		.meanShareCount = StatisticalValueFromTL(data.vshares_per_post()),
+
+		.enabledNotificationsPercentage = unmuted,
+
+		.recentMessageInteractions = std::move(recentMessages),
+	};
+}
+
 } // namespace
 
 Statistics::Statistics(not_null<ApiWrap*> api)
 : _api(&api->instance()) {
 }
 
-rpl::producer<> Statistics::request(
-		not_null<PeerData*> peer) const {
-	return rpl::never<>();
+rpl::producer<rpl::no_value, QString> Statistics::request(
+		not_null<PeerData*> peer) {
+	return [=](auto consumer) {
+		auto lifetime = rpl::lifetime();
+		const auto channel = peer->asChannel();
+		if (!channel) {
+			return lifetime;
+		}
+
+		if (!channel->isMegagroup()) {
+			_api.request(MTPstats_GetBroadcastStats(
+				MTP_flags(MTPstats_GetBroadcastStats::Flags(0)),
+				channel->inputChannel
+			)).done([=](const MTPstats_BroadcastStats &result) {
+				_channelStats = ChannelStatisticsFromTL(result.data());
+				consumer.put_done();
+			}).fail([=](const MTP::Error &error) {
+				consumer.put_error_copy(error.type());
+			}).send();
+		}
+
+		return lifetime;
+	};
+}
+
+Data::ChannelStatistics Statistics::channelStats() const {
+	return _channelStats;
 }
 
 } // namespace Api
diff --git a/Telegram/SourceFiles/api/api_statistics.h b/Telegram/SourceFiles/api/api_statistics.h
index 2197c9f82..6591976e7 100644
--- a/Telegram/SourceFiles/api/api_statistics.h
+++ b/Telegram/SourceFiles/api/api_statistics.h
@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
+#include "data/data_statistics.h"
 #include "mtproto/sender.h"
 
 class ApiWrap;
@@ -18,10 +19,13 @@ class Statistics final {
 public:
 	explicit Statistics(not_null<ApiWrap*> api);
 
-	[[nodiscard]] rpl::producer<> request(
-		not_null<PeerData*> peer) const;
+	[[nodiscard]] rpl::producer<rpl::no_value, QString> request(
+		not_null<PeerData*> peer);
+
+	[[nodiscard]] Data::ChannelStatistics channelStats() const;
 
 private:
+	Data::ChannelStatistics _channelStats;
 	MTP::Sender _api;
 
 };