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Telegram/SourceFiles/api/api_premium_option.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "data/data_premium_subscription_option.h"
+
+namespace Api {
+
+[[nodiscard]] Data::PremiumSubscriptionOption CreateSubscriptionOption(
+	int months,
+	int monthlyAmount,
+	int64 amount,
+	const QString &currency,
+	const QString &botUrl);
+
+template<typename Option>
+[[nodiscard]] auto PremiumSubscriptionOptionsFromTL(
+		const QVector<Option> &tlOpts) -> Data::PremiumSubscriptionOptions {
+	if (tlOpts.isEmpty()) {
+		return {};
+	}
+	auto monthlyAmountPerCurrency = base::flat_map<QString, int>();
+	auto result = Data::PremiumSubscriptionOptions();
+	const auto monthlyAmount = [&](const QString &currency) -> int {
+		const auto it = monthlyAmountPerCurrency.find(currency);
+		if (it != end(monthlyAmountPerCurrency)) {
+			return it->second;
+		}
+		const auto &min = ranges::min_element(
+			tlOpts,
+			ranges::less(),
+			[&](const Option &o) {
+				return currency == qs(o.data().vcurrency())
+					? o.data().vamount().v
+					: std::numeric_limits<int64_t>::max();
+			}
+		)->data();
+		const auto monthly = min.vamount().v / float64(min.vmonths().v);
+		monthlyAmountPerCurrency.emplace(currency, monthly);
+		return monthly;
+	};
+	result.reserve(tlOpts.size());
+	for (const auto &tlOption : tlOpts) {
+		const auto &option = tlOption.data();
+		auto botUrl = QString();
+		if constexpr (!std::is_same_v<Option, MTPPremiumGiftCodeOption>) {
+			botUrl = qs(option.vbot_url());
+		}
+		const auto months = option.vmonths().v;
+		const auto amount = option.vamount().v;
+		const auto currency = qs(option.vcurrency());
+		result.push_back(CreateSubscriptionOption(
+			months,
+			monthlyAmount(currency),
+			amount,
+			currency,
+			botUrl));
+	}
+	return result;
+}
+
+} // namespace Api