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// Next.js App Router: High-Performance Server Action with Redis Rate-Limiting
import { revalidateTag } from 'next/cache';
import { Redis } from '@upstash/redis';

const redis = Redis.fromEnv();

export async function processEnterpriseSubscription(formData: FormData) {
  'use server';
  const ip = headers().get('x-forwarded-for') ?? 'anonymous';
  
  // Rate-limiting: 5 requests per 60 seconds
  const rateLimit = await redis.incr(`ratelimit:${ip}`);
  if (rateLimit === 1) await redis.expire(`ratelimit:${ip}`, 60);
  if (rateLimit > 5) throw new Error('Too many requests. Please wait.');

  const planId = formData.get('planId') as string;
  const customerId = formData.get('customerId') as string;

  // Execute atomic database operation & revalidate cached billing UI
  await createStripeCustomerSession({ planId, customerId });
  revalidateTag('customer-billing');

  return { success: true };
}