/********************************************************************************
 * Copyright (c) 2015-2018 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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.
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 ********************************************************************************/

package org.eclipse.mdm.preferences.entity;

import static org.assertj.core.api.Assertions.assertThat;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.TypedQuery;

import org.eclipse.persistence.config.PersistenceUnitProperties;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.google.common.collect.ImmutableMap;

public class PreferenceTest {
	private static final long CLOB_SIZE = 1_000_000;

	private EntityManagerFactory factory;

	@Before
	public void init() {
		factory = Persistence.createEntityManagerFactory("preferenceTest", ImmutableMap
				.of(PersistenceUnitProperties.ECLIPSELINK_PERSISTENCE_XML, "META-INF/persistence-test.xml"));

		EntityManager em = factory.createEntityManager();
		em.getTransaction().begin();
		em.createQuery("delete from Preference").executeUpdate();
		em.getTransaction().commit();
		em.close();
	}

	@After
	public void destroy() {
		factory.close();
	}

	@Test
	public void testPersist() {

		EntityManager em = factory.createEntityManager();

		em.getTransaction().begin();
		Preference p = new Preference("MDMXYZ", "*", "key1", "value1");
		em.persist(p);
		em.getTransaction().commit();
	}

	@Test
	public void testLoad() {
		EntityManager em = factory.createEntityManager();

		em.getTransaction().begin();
		Preference p = new Preference("MDMXYZ", "*", "key2", "value1");
		em.persist(p);
		em.getTransaction().commit();

		assertThat(em.find(Preference.class, p.getId()))
				.isEqualToIgnoringGivenFields(new Preference("MDMXYZ", "*", "key2", "value1"), "id");

		em.close();
	}

	@Test
	public void testQuery() {
		EntityManager em = factory.createEntityManager();

		em.getTransaction().begin();
		Preference p = new Preference("MDMXYZ", "*", "key3", "value1");
		em.persist(p);
		em.getTransaction().commit();

		TypedQuery<Preference> q = em.createQuery("select p from Preference p", Preference.class);
		assertThat(q.getResultList()).hasSize(1).usingElementComparatorIgnoringFields("id")
				.contains(new Preference("MDMXYZ", "*", "key3", "value1"));

		em.close();
	}

	@Test
	public void testPersistLob() {
		String longString = generateString(CLOB_SIZE);

		EntityManager em = factory.createEntityManager();

		em.getTransaction().begin();
		Preference p = new Preference("MDMXYZ", "*", "clob", longString);
		em.persist(p);
		em.getTransaction().commit();
		em.close();

		em = factory.createEntityManager();
		Preference loaded = em.find(Preference.class, p.getId());

		assertThat(loaded).isEqualToIgnoringGivenFields(new Preference("MDMXYZ", "*", "clob", longString), "id");
		em.close();
	}

	private String generateString(long length) {
		StringBuilder builder = new StringBuilder();
		for (int i = 0; i < length; i++) {
			builder.append("a");
		}
		return builder.toString();
	}
}