/**
 * Stripe client for the Billing Service.
 *
 * Multi-tenant: supports per-product Stripe keys via env vars:
 *   STRIPE_SECRET_KEY             — default key
 *   STRIPE_SECRET_KEY_<PRODUCTID> — product-specific key (uppercase)
 */

import Stripe from 'stripe';

const _cache = new Map<string, Stripe>();

/** Get a Stripe client, optionally per-product (falls back to default key). */
export function getStripeForProduct(productId?: string): Stripe {
  const cacheKey = productId || 'default';
  if (_cache.has(cacheKey)) return _cache.get(cacheKey)!;

  // Try product-specific key first, then default
  const envKey = productId ? `STRIPE_SECRET_KEY_${productId.toUpperCase()}` : 'STRIPE_SECRET_KEY';
  const key = process.env[envKey] || process.env.STRIPE_SECRET_KEY;
  if (!key) throw new Error(`Stripe key not configured (tried ${envKey})`);

  const client = new Stripe(key);
  _cache.set(cacheKey, client);
  return client;
}

/** Alias for backward compatibility. */
export function getStripe(): Stripe {
  return getStripeForProduct();
}

/** Get price IDs — configurable per product in the future. */
export function getPriceIds(): Record<string, string> {
  return {
    pro: process.env.STRIPE_PRICE_PRO || 'price_pro_placeholder',
    enterprise: process.env.STRIPE_PRICE_ENTERPRISE || 'price_enterprise_placeholder',
  };
}

export const PRICE_IDS: Record<string, string> = getPriceIds();