import Stripe from 'stripe';
import { PaymentClient } from '../portal';

/**
 * Stripe-backed reloads: creates a PaymentIntent and returns its client
 * secret. The balance is credited only after the payment confirms (webhook
 * step); until then creditedCents is 0 and the intent is pending.
 */
export function stripePaymentClient(secretKey: string): PaymentClient {
  const stripe = new Stripe(secretKey);
  return {
    reload: async (customer, amountCents) => {
      const intent = await stripe.paymentIntents.create({
        amount: amountCents,
        currency: 'usd',
        automatic_payment_methods: { enabled: true },
        metadata: { customerId: customer.id },
      });
      return {
        mode: 'stripe',
        creditedCents: 0,
        clientSecret: intent.client_secret ?? undefined,
      };
    },
  };
}

/** True when the key looks usable (not empty / not the setup placeholder). */
export function hasRealStripeKey(key: string | undefined): key is string {
  return typeof key === 'string' && key.startsWith('sk_');
}