import { getCMS } from "@/lib/payload/getPayload";
import { hashVerificationToken } from "@/lib/auth/verification";

const TOKEN_SHAPE = /^[0-9a-f]{64}$/i;

/**
 * Verifies a token from a /auth/verify-email/[token] link: looks it up by
 * hash (the plaintext is never stored), checks it hasn't expired, then
 * marks the account verified and immediately clears the hash + expiry so
 * the same link can never be used a second time.
 */
export async function verifyEmailToken(token: string): Promise<boolean> {
  if (!TOKEN_SHAPE.test(token)) return false;

  const payload = await getCMS();
  const hash = hashVerificationToken(token);

  const { docs } = await payload.find({
    collection: "customers",
    where: { emailVerificationTokenHash: { equals: hash } },
    limit: 1,
  });
  const customer = docs[0];
  if (!customer || !customer.emailVerificationExpires) return false;
  if (new Date(customer.emailVerificationExpires).getTime() < Date.now()) return false;

  await payload.update({
    collection: "customers",
    id: customer.id,
    data: {
      emailVerified: true,
      emailVerificationTokenHash: null,
      emailVerificationExpires: null,
    },
  });

  return true;
}