From 01fc8ea1c113e3b28d5f939d88287df8ee51713d Mon Sep 17 00:00:00 2001
From: AlexeyZavar <sltkval1@gmail.com>
Date: Sat, 13 Dec 2025 19:59:43 +0300
Subject: [PATCH] feat: cache localizations

---
 Telegram/SourceFiles/ayu/ayu_lang.cpp     | 63 +++++++++++++++++++++++
 Telegram/SourceFiles/ayu/ayu_lang.h       |  6 +++
 Telegram/SourceFiles/ayu/ayu_settings.cpp | 10 ++--
 3 files changed, 75 insertions(+), 4 deletions(-)

diff --git a/Telegram/SourceFiles/ayu/ayu_lang.cpp b/Telegram/SourceFiles/ayu/ayu_lang.cpp
index e9d0aad7c4..31409c6f7f 100644
--- a/Telegram/SourceFiles/ayu/ayu_lang.cpp
+++ b/Telegram/SourceFiles/ayu/ayu_lang.cpp
@@ -6,10 +6,14 @@
 // Copyright @Radolyn, 2025
 #include "ayu_lang.h"
 
+#include <QDir>
+#include <QFile>
+
 #include "qjsondocument.h"
 #include "core/application.h"
 #include "core/core_settings.h"
 #include "lang/lang_instance.h"
+#include "storage/localstorage.h"
 
 // hard-coded languages
 std::map<QString, QString> langMapping = {
@@ -35,14 +39,72 @@ AyuLanguage::AyuLanguage() = default;
 
 void AyuLanguage::init() {
 	if (!instance) instance = new AyuLanguage;
+	instance->loadCachedLanguage();
 }
 
 AyuLanguage *AyuLanguage::currentInstance() {
 	return instance;
 }
 
+QString AyuLanguage::getCacheDir() const {
+	return cWorkingDir() + u"tdata/ayu/languages/"_q;
+}
+
+QString AyuLanguage::getCachePath(const QString &langId) const {
+	return getCacheDir() + langId + u".json"_q;
+}
+
+void AyuLanguage::loadCachedLanguage() {
+	const auto langPackId = Lang::GetInstance().id();
+	const auto langPackBaseId = Lang::GetInstance().baseId();
+	auto finalLangPackId = langMapping.contains(langPackId) ? langMapping[langPackId] : langPackId;
+
+	if (finalLangPackId.isEmpty()) {
+		finalLangPackId = langPackBaseId;
+	}
+	if (finalLangPackId.isEmpty()) {
+		return;
+	}
+
+	const auto cachePath = getCachePath(finalLangPackId);
+	QFile file(cachePath);
+	if (!file.exists()) {
+		const auto basePath = getCachePath(langPackBaseId);
+		if (!QFile::exists(basePath)) {
+			return;
+		}
+		file.setFileName(basePath);
+	}
+
+	if (file.open(QIODevice::ReadOnly)) {
+		const auto data = file.readAll();
+		file.close();
+
+		QJsonParseError error{};
+		const auto doc = QJsonDocument::fromJson(data, &error);
+		if (error.error == QJsonParseError::NoError) {
+			LOG(("Loading cached AyuGram language: %1").arg(finalLangPackId));
+			applyLanguageJson(doc);
+		}
+	}
+}
+
+void AyuLanguage::saveCachedLanguage(const QByteArray &json, const QString &langId) {
+	const auto cacheDir = getCacheDir();
+	QDir().mkpath(cacheDir);
+
+	const auto cachePath = getCachePath(langId);
+	QFile file(cachePath);
+	if (file.open(QIODevice::WriteOnly)) {
+		file.write(json);
+		file.close();
+		LOG(("Cached AyuGram language: %1").arg(langId));
+	}
+}
+
 void AyuLanguage::fetchLanguage(const QString &id, const QString &baseId) {
 	auto finalLangPackId = langMapping.contains(id) ? langMapping[id] : id;
+	_currentLangId = finalLangPackId.isEmpty() ? baseId : finalLangPackId;
 
 	if (Core::App().settings().proxy().isEnabled()) {
 		const auto proxy = Core::App().settings().proxy().selected();
@@ -84,6 +146,7 @@ void AyuLanguage::fetchFinished() {
 		QJsonParseError error{};
 		const auto doc = QJsonDocument::fromJson(result, &error);
 		if (error.error == QJsonParseError::NoError) {
+			saveCachedLanguage(result, _currentLangId);
 			applyLanguageJson(doc);
 		} else {
 			LOG(("Incorrect language JSON File."));
diff --git a/Telegram/SourceFiles/ayu/ayu_lang.h b/Telegram/SourceFiles/ayu/ayu_lang.h
index d80ca2d4d0..3a9960a9c0 100644
--- a/Telegram/SourceFiles/ayu/ayu_lang.h
+++ b/Telegram/SourceFiles/ayu/ayu_lang.h
@@ -30,7 +30,13 @@ private:
 	AyuLanguage();
 	~AyuLanguage() override = default;
 
+	void loadCachedLanguage();
+	void saveCachedLanguage(const QByteArray &json, const QString &langId);
+	[[nodiscard]] QString getCacheDir() const;
+	[[nodiscard]] QString getCachePath(const QString &langId) const;
+
 	QNetworkAccessManager networkManager;
 	QNetworkReply *_chkReply = nullptr;
 	bool needFallback = false;
+	QString _currentLangId;
 };
diff --git a/Telegram/SourceFiles/ayu/ayu_settings.cpp b/Telegram/SourceFiles/ayu/ayu_settings.cpp
index 3c7afa705c..f217e26842 100644
--- a/Telegram/SourceFiles/ayu/ayu_settings.cpp
+++ b/Telegram/SourceFiles/ayu/ayu_settings.cpp
@@ -25,8 +25,6 @@ using json = nlohmann::json;
 
 namespace AyuSettings {
 
-const std::string filename = "tdata/ayu_settings.json";
-
 std::optional<AyuGramSettings> settings = std::nullopt;
 
 rpl::variable<bool> sendReadMessagesReactive;
@@ -155,8 +153,12 @@ AyuGramSettings &getInstance() {
 	return settings.value();
 }
 
+std::string getSettingsPath() {
+	return (cWorkingDir() + u"tdata/ayu_settings.json"_q).toStdString();
+}
+
 void load() {
-	std::ifstream file(filename);
+	std::ifstream file(getSettingsPath());
 	if (!file.good()) {
 		return;
 	}
@@ -194,7 +196,7 @@ void save() {
 	json p = settings.value();
 
 	std::ofstream file;
-	file.open(filename);
+	file.open(getSettingsPath());
 	file << p.dump(4);
 	file.close();