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Telegram/SourceFiles/api/api_premium_option.cpp

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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
+*/
+#include "api/api_premium_option.h"
+
+#include "ui/text/format_values.h"
+
+namespace Api {
+
+constexpr auto kDiscountDivider = 1.;
+
+Data::PremiumSubscriptionOption CreateSubscriptionOption(
+		int months,
+		int monthlyAmount,
+		int64 amount,
+		const QString &currency,
+		const QString &botUrl) {
+	const auto discount = [&] {
+		const auto percent = 1. - float64(amount) / (monthlyAmount * months);
+		return std::round(percent * 100. / kDiscountDivider)
+			* kDiscountDivider;
+	}();
+	return {
+		.months = months,
+		.duration = Ui::FormatTTL(months * 86400 * 31),
+		.discount = (discount > 0)
+			? QString::fromUtf8("\xe2\x88\x92%1%").arg(discount)
+			: QString(),
+		.costPerMonth = Ui::FillAmountAndCurrency(
+			amount / float64(months),
+			currency),
+		.costNoDiscount = Ui::FillAmountAndCurrency(
+			monthlyAmount * months,
+			currency),
+		.costPerYear = Ui::FillAmountAndCurrency(
+			amount / float64(months / 12.),
+			currency),
+		.botUrl = botUrl,
+	};
+}
+
+} // namespace Api