package example.client;

import example.entity.UserCredential;

import javax.persistence.*;

public class Main { // appclient main class must be public

    // 1. injected field must be static in an appclient.
    // 2. We can't inject an EntityManager into an appclient, so
    // let's inject an EntityManagerFactory.
    @PersistenceUnit
    private static EntityManagerFactory emf; 
    
    public static void main(String... args) throws Exception {
        EntityManager em = emf.createEntityManager();
        for(String name : args) {

            // In ACC, JTA EM is not supported. Let's use EntityTransaction API.
            EntityTransaction et = em.getTransaction();
            et.begin();
            System.out.println("Finding " + name);
            UserCredential uc = em.find(UserCredential.class, name);
            if(uc!=null) {
                System.out.println("Found " + name + ", going to remove it");
                em.remove(uc);
                System.out.println("Removed " + name);
            } else {
                System.out.println("No user called " + name + ", so creating one.");
                em.persist(new UserCredential(name, name));
                System.out.println("Created " + name);
            }
            et.commit();
        }
        em.close();
    }
}