/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package myapp;

import jakarta.persistence.*;
import jakarta.transaction.*;
import java.io.*;

public class JpaTest {

    private EntityManagerFactory emf;
    private EntityManager em;
    private UserTransaction utx;
    PrintWriter out;
    private static Department deptRef[] = new Department[2];
    private static Employee empRef[] = new Employee[5];

    public JpaTest(){}

    public JpaTest(EntityManagerFactory emf, EntityManager em,
        UserTransaction utx, PrintWriter out){
       this.emf = emf;
       this.em = em;
       this.utx = utx;
       this.out = out;
    }

    protected boolean lazyLoadingInit(){
       boolean status = false;
       out.println("-----lazeLoadingInit()---------");
       try {
     deptRef[0] = new Department(1, "Engineering");
     deptRef[1] = new Department(2, "Marketing");
     utx.begin();
     em.joinTransaction();
     for (int i=0; i < 2; i++ ) {
       em.persist(deptRef[i]);
     }
     utx.commit();

     empRef[0] = new Employee(1, "Alan", "Frechette", deptRef[0]);
     empRef[1] = new Employee(2, "Arthur", "Wesley", deptRef[0]);
     empRef[2] = new Employee(3, "Abe", "White", deptRef[0]);
     empRef[3] = new Employee(4, "Paul", "Hinz", deptRef[1]);
     empRef[4] = new Employee(5, "Carla", "Calrson", deptRef[1]);
     utx.begin();
     em.joinTransaction();
     for (int i=0; i<5; i++ ) {
       em.persist(empRef[i]);
     }
     utx.commit();
     status = true;
       } catch(Exception ex){
     ex.printStackTrace();
       }
       out.println("-----status = " + status + "---------");
       return status;
    }

    public boolean lazyLoadingByFind(int employeeID) {

      boolean status=true;
      out.println("------------lazyLoadingAfterFind -----------");
      out.println("employeeID = "+ employeeID);
      Employee emp = em.find(Employee.class, employeeID);

      out.println("found: emp.id=" + emp.getId());

      try {
    // 1. get Department before loading
    Department deptBL = emp.getDepartmentNoWeaving();
    out.println("1. before loading: deptBL="+deptBL);
    String deptNameBL = null;
    if (deptBL != null) {
      deptNameBL = deptBL.getName();
      out.println("deptNameBL="+deptNameBL);
    }
    // assert deptBL == null;
        if (deptBL != null) {
            status = false;
    }

    // 2. loading
    String deptName = emp.getDepartment().getName();
    out.println("2. loading, deptName = " + deptName);

    // 3. get Department after loading
    Department deptAL = emp.getDepartmentNoWeaving();
    out.println("3. after loading: deptAL="+deptAL);
    String deptNameAL = deptAL.getName();
    System.out.println("deptNameAL="+deptNameAL);
    //   assert deptAL != null
    //   assert deptAL.getName == deptName;
        if (deptAL == null ||  deptNameAL != deptName) {
        status = false;
    }
      } catch(Exception ex){
    status = false;
    ex.printStackTrace();
      }

      out.println("-----status = " + status + "---------");
      return status;
    }

    public boolean lazyLoadingByQuery(String fName) {

      boolean status=true;
      out.println("------------lazyLoadingByQuery -----------");
      out.println("fName = "+ fName);
      Query query = em.createQuery(
    "SELECT e FROM Employee e WHERE e.firstName like :firstName")
    .setParameter("firstName", fName);;
      Employee emp = (Employee) query.getSingleResult();

      out.println("queried: emp.firstName=" + emp.getFirstName());

      try {
    // 1. get Department before loading
    Department deptBL = emp.getDepartmentNoWeaving();
    out.println("1. before loading: deptBL="+deptBL);
    String deptNameBL = null;
    if (deptBL != null) {
      deptNameBL = deptBL.getName();
      out.println("deptNameBL="+deptNameBL);
    }
    // assert deptBL == null;
        if (deptBL != null) {
            status = false;
    }

    // 2. loading
    String deptName = emp.getDepartment().getName();
    System.out.println("2. loading, deptName = " + deptName);

    // 3. get Department after loading
    Department deptAL = emp.getDepartmentNoWeaving();
    out.println("3. after loading: deptAL="+deptAL);
    String deptNameAL = deptAL.getName();
    out.println("deptNameAL="+deptNameAL);
    //   assert deptAL != null
    //   assert deptAL.getName == deptName;
        if (deptAL == null ||  deptNameAL != deptName) {
        status = false;
    }
      } catch(Exception ex){
    status = false;
    ex.printStackTrace();
      }
      out.println("-----status = " + status + "---------");
      return status;
    }

}