// The server's refusals of a staff payment, in the words staff see. Any other answer is not a refusal:
// the payment may have landed, so its key is kept.
type Refusal = { outcome?: unknown; message?: unknown; openUntil?: unknown };

export const paymentRefusal = (body: unknown): string | undefined => {
    const refusal = body as Refusal | undefined;
    if (refusal?.outcome !== 'refused') return undefined;
    switch (refusal.message) {
        case 'amount_exceeds_remaining':
        case 'partial_payment_not_allowed':
            return 'The balance changed before the payment was recorded. Check what is owed and try again.';
        case 'card_payment_open': {
            const until = typeof refusal.openUntil === 'string' ? new Date(refusal.openUntil) : undefined;
            const when = until && !Number.isNaN(until.getTime())
                ? ` until ${until.toLocaleTimeString([], { hour: 'numeric', minute: '2-digit' })}`
                : '';
            return `A card payment is open on this invoice${when}. Nothing was recorded; record this payment once it completes or expires.`;
        }
        default:
            return 'This invoice is no longer open for payment, so nothing was recorded.';
    }
};