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fix(subscription): fall back to purchase flow for free-tariff switches

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The bot backend now rejects prorated tariff switches from a free (0RUB)
tariff with 400 free_tariff_cannot_switch + use_purchase_flow=true
(TARIFF_SWITCH_RESET_FREE_DAYS: the free remainder must reset, not be
prorated over hundreds of accumulated days and carried to a paid
tariff). Handle it like the existing trial_cannot_switch contract:

- SwitchTariffSheet: accept free_tariff_cannot_switch in
  shouldUsePurchaseFlow so the sheet hands off to the purchase form
- TariffPickerGrid: new subscription_on_free_tariff purchase-options
  flag disables the switch CTA up front and shows purchase instead

Companion to BEDOLAGA-DEV/remnawave-bedolaga-telegram-bot#3056.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Chara-Freedom
2026-07-13 05:36:12 +03:00
parent f9ee16a2e6
commit 255777e7d1
3 changed files with 20 additions and 5 deletions
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14
src/components/subscription/sheets/SwitchTariffSheet.tsx
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@@ -27,11 +27,13 @@ import type { Tariff } from '../../../types';
// ──────────────────────────────────────────────────────────────────
// The backend rejects a switch that must instead go through the purchase flow:
// the subscription lapsed (`subscription_expired`), or it is a trial that has no
// the subscription lapsed (`subscription_expired`), it is a trial that has no
// paid value to prorate and would otherwise be handed a full target period
// (`trial_cannot_switch`, bug #629889). Both arrive as detail.code +
// use_purchase_flow=true; some payloads use the legacy `error_code` key, so we
// accept either.
// (`trial_cannot_switch`, bug #629889), or it sits on a free 0₽ tariff whose
// spammed/gifted remainder must reset rather than be prorated and carried
// (`free_tariff_cannot_switch`, TARIFF_SWITCH_RESET_FREE_DAYS). All arrive as
// detail.code + use_purchase_flow=true; some payloads use the legacy
// `error_code` key, so we accept either.
function shouldUsePurchaseFlow(error: unknown): boolean {
if (!(error instanceof AxiosError)) return false;
const detail = error.response?.data?.detail as
@@ -40,7 +42,9 @@ function shouldUsePurchaseFlow(error: unknown): boolean {
if (!detail || typeof detail !== 'object') return false;
const code = detail.code ?? detail.error_code;
return (
(code === 'subscription_expired' || code === 'trial_cannot_switch') &&
(code === 'subscription_expired' ||
code === 'trial_cannot_switch' ||
code === 'free_tariff_cannot_switch') &&
detail.use_purchase_flow === true
);
}