const Contacts = Application("Contacts");
const email = "ada@example.com";
try {
  const existing = Contacts.people.whose({ emails: { value: { _equals: email } } })();
  const person = existing.length ? existing[0] : Contacts.Person().make();
  person.firstName = "Ada";
  person.lastName = "Lovelace";
  
  // Handle multi-value email
  const work = Contacts.Email({ label: "Work", value: email });
  person.emails.push(work);
  Contacts.save();
  
  // Handle groups with error checking
  let grp;
  try { 
    grp = Contacts.groups.byName("VIP"); 
    grp.name(); // Verify exists
  } catch (e) {
    grp = Contacts.Group().make(); 
    grp.name = "VIP";
  }
  Contacts.add(person, { to: grp });
  Contacts.save();
  console.log("Contact upserted successfully");
} catch (error) {
  console.error("Contacts operation failed:", error);
}