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 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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package org.apache.cayenne.query;

import static org.junit.Assert.assertEquals;

import java.util.Collections;

import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.di.Inject;
import org.apache.cayenne.test.jdbc.DBHelper;
import org.apache.cayenne.test.jdbc.TableHelper;
import org.apache.cayenne.unit.di.server.CayenneProjects;
import org.apache.cayenne.unit.di.server.ServerCase;
import org.apache.cayenne.unit.di.server.UseServerRuntime;
import org.junit.Before;
import org.junit.Test;

@UseServerRuntime(CayenneProjects.TESTMAP_PROJECT)
public class EJBQLQueryCountIT extends ServerCase {

	@Inject
	private ObjectContext context;

	@Inject
	protected DBHelper dbHelper;

	protected TableHelper tArtist;
	protected TableHelper tPainting;
	protected TableHelper tGallery;

	@Before
	public void before() throws Exception {
		tArtist = new TableHelper(dbHelper, "ARTIST");
		tArtist.setColumns("ARTIST_ID", "ARTIST_NAME");

		tPainting = new TableHelper(dbHelper, "PAINTING");
		tPainting.setColumns("PAINTING_ID", "ARTIST_ID", "PAINTING_TITLE");
	}

	@Test
	public void test_ToOne() throws Exception {
		tArtist.insert(1, "A1");
		tArtist.insert(2, "A2");
		tArtist.insert(3, "A3");

		tPainting.insert(1, 1, "P1");
		tPainting.insert(2, 1, "P2");
		tPainting.insert(4, 2, "P1");

		EJBQLQuery query = new EJBQLQuery("SELECT COUNT(p.toArtist) FROM Painting p");

		// this should be simply a count of painting/artist joins
		assertEquals(Collections.singletonList(3l), context.performQuery(query));
	}

//	@Test
//	public void test_DistinctToOne() throws Exception {
//		tArtist.insert(1, "A1");
//		tArtist.insert(2, "A2");
//		tArtist.insert(3, "A3");
//
//		tPainting.insert(1, 1, "P1");
//		tPainting.insert(2, 1, "P2");
//		tPainting.insert(4, 2, "P1");
//
//		EJBQLQuery query = new EJBQLQuery("SELECT COUNT(DISTINCT p.toArtist) FROM Painting p");
//		// this should be a count of artists that have paintings
//		assertEquals(Collections.singletonList(2l), context.performQuery(query));
//	}
	
	@Test
	public void test_DistinctToOneAttribute() throws Exception {
		tArtist.insert(1, "A1");
		tArtist.insert(2, "A1");
		tArtist.insert(3, "A1");

		tPainting.insert(1, 1, "P1");
		tPainting.insert(2, 1, "P2");
		tPainting.insert(4, 2, "P1");

		EJBQLQuery query = new EJBQLQuery("SELECT COUNT(DISTINCT p.toArtist.artistName) FROM Painting p");
		// this should be a count of artists that have paintings
		assertEquals(Collections.singletonList(1l), context.performQuery(query));
	}
	
}