/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org

Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.

Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once

#include "mtproto/sender.h"

namespace MTP {
class Instance;
} // namespace MTP

namespace Lang {

class Instance;

class CloudManager : private MTP::Sender {
public:
	CloudManager(Instance &langpack, gsl::not_null<MTP::Instance*> mtproto);

	struct Language {
		QString id;
		QString name;
	};
	using Languages = QVector<Language>;

	void requestLanguageList();
	Languages languageList() const {
		return _languages;
	}
	base::Observable<void> &languageListChanged() {
		return _languagesChanged;
	}
	void requestLangPackDifference();
	void applyLangPackDifference(const MTPLangPackDifference &difference);

	void switchToLanguage(const QString &id);

private:
	void applyLangPack(const MTPUpdates &updates);
	void switchLangPackId(const QString &id);

	Instance &_langpack;
	Languages _languages;
	base::Observable<void> _languagesChanged;
	mtpRequestId _langPackRequestId = 0;
	mtpRequestId _languagesRequestId = 0;

};

inline bool operator==(const CloudManager::Language &a, const CloudManager::Language &b) {
	return (a.id == b.id) && (a.name == b.name);
}

inline bool operator!=(const CloudManager::Language &a, const CloudManager::Language &b) {
	return !(a == b);
}

CloudManager &CurrentCloudManager();

} // namespace Lang