Handle already-premium state in gift link usage.

Telegram/Resources/langs/lang.strings

@@ -1103,7 +1103,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_edit_privacy_everyone" = "Everybody";
 "lng_edit_privacy_contacts" = "My contacts";
 "lng_edit_privacy_close_friends" = "Close friends";
-"lng_edit_privacy_contacts_and_premium" = "Contacts and Premium";
+"lng_edit_privacy_contacts_and_premium" = "Contacts & Premium";
 "lng_edit_privacy_nobody" = "Nobody";
 "lng_edit_privacy_premium" = "Premium users";
 "lng_edit_privacy_exceptions" = "Add exceptions";
@@ -2687,6 +2687,9 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_gift_link_also_send" = "You can also {link} to a friend as a gift.";
 "lng_gift_link_also_send_link" = "send this link";
 "lng_gift_link_use" = "Use Link";
+"lng_gift_link_already_title" = "You already have Telegram Premium";
+"lng_gift_link_already_about" = "You can activate this link after {date} or {link} to a friend.";
+"lng_gift_link_already_link" = "send the link";
 "lng_gift_link_used_title" = "Used Gift Link";
 "lng_gift_link_used_about" = "This link was used to activate\na **Telegram Premium** subscription.";
 "lng_gift_link_used_footer" = "This link was used on {date}.";

Telegram/SourceFiles/boxes/gift_premium_box.cpp

@@ -45,6 +45,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/rect.h"
 #include "ui/vertical_list.h"
 #include "ui/text/text_utilities.h"
+#include "ui/toast/toast.h"
 #include "ui/widgets/checkbox.h"
 #include "ui/widgets/gradient_round_button.h"
 #include "ui/wrap/padding_wrap.h"
@@ -892,6 +893,52 @@ void AddTable(
 	}
 }
 
+void ShareWithFriend(
+		not_null<Window::SessionNavigation*> navigation,
+		const QString &slug) {
+	const auto chosen = [=](not_null<Data::Thread*> thread) {
+		const auto content = navigation->parentController()->content();
+		return content->shareUrl(
+			thread,
+			MakeGiftCodeLink(&navigation->session(), slug).link,
+			QString());
+	};
+	Window::ShowChooseRecipientBox(navigation, chosen);
+}
+
+[[nodiscard]] void ShowAlreadyPremiumToast(
+		not_null<Window::SessionNavigation*> navigation,
+		const QString &slug,
+		TimeId date) {
+	const auto instance = std::make_shared<
+		base::weak_ptr<Ui::Toast::Instance>
+	>();
+	const auto shareLink = [=](
+			const ClickHandlerPtr &,
+			Qt::MouseButton button) {
+		if (button == Qt::LeftButton) {
+			if (const auto strong = instance->get()) {
+				strong->hideAnimated();
+			}
+			ShareWithFriend(navigation, slug);
+		}
+		return false;
+	};
+	*instance = navigation->showToast({
+		.title = tr::lng_gift_link_already_title(tr::now),
+		.text = tr::lng_gift_link_already_about(
+			tr::now,
+			lt_date,
+			Ui::Text::Bold(langDateTime(base::unixtime::parse(date))),
+			lt_link,
+			Ui::Text::Link(
+				Ui::Text::Bold(tr::lng_gift_link_already_link(tr::now))),
+			Ui::Text::WithEntities),
+		.duration = 6 * crl::time(1000),
+		.filter = crl::guard(navigation, shareLink),
+	});
+}
+
 } // namespace
 
 GiftPremiumValidator::GiftPremiumValidator(
@@ -1157,14 +1204,7 @@ void GiftCodeBox(
 			st::giveawayGiftCodeFooter),
 		st::giveawayGiftCodeFooterMargin);
 	footer->setClickHandlerFilter([=](const auto &...) {
-		const auto chosen = [=](not_null<Data::Thread*> thread) {
-			const auto content = controller->parentController()->content();
-			return content->shareUrl(
-				thread,
-				MakeGiftCodeLink(&controller->session(), slug).link,
-				QString());
-		};
-		Window::ShowChooseRecipientBox(controller, chosen);
+		ShareWithFriend(controller, slug);
 		return false;
 	});
 
@@ -1189,14 +1229,20 @@ void GiftCodeBox(
 		} else if (!state->sent) {
 			state->sent = true;
 			const auto done = crl::guard(box, [=](const QString &error) {
+				const auto activePrefix = u"PREMIUM_SUB_ACTIVE_UNTIL_"_q;
 				if (error.isEmpty()) {
 					auto copy = state->data.current();
 					copy.used = base::unixtime::now();
 					state->data = std::move(copy);
 
 					Ui::StartFireworks(box->parentWidget());
+				} else if (error.startsWith(activePrefix)) {
+					const auto date = error.mid(activePrefix.size()).toInt();
+					ShowAlreadyPremiumToast(controller, slug, date);
+					state->sent = false;
 				} else {
 					box->uiShow()->showToast(error);
+					state->sent = false;
 				}
 			});
 			controller->session().api().premium().applyGiftCode(slug, done);