Momento/memento-note/lib/billing/trial.ts

import { prisma } from '@/lib/prisma'

export { SUBSCRIPTION_TRIAL_DAYS } from '@/lib/billing/trial-constants'

/**
 * Offer a trial only to users who never held a real Stripe subscription.
 * Users with cus_mock / price_mock leftovers from local tests are still eligible
 * if they never had a non-mock stripeSubscriptionId.
 */
export async function shouldOfferSubscriptionTrial(userId: string): Promise<boolean> {
  const sub = await prisma.subscription.findUnique({
    where: { userId },
    select: {
      stripeSubscriptionId: true,
      tier: true,
      status: true,
      trialEndsAt: true,
    },
  })

  if (!sub) return true

  const stripeSubId = sub.stripeSubscriptionId
  if (stripeSubId && !stripeSubId.startsWith('sub_mock')) {
    return false
  }

  // Already on a paid / trial tier locally without a Stripe id (admin override)
  if (sub.tier !== 'BASIC' && (sub.status === 'ACTIVE' || sub.status === 'TRIALING')) {
    return false
  }

  return true
}