/*
 * Copyright 2002-2008 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.batch.core.configuration.xml;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.ArrayList;
import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.aop.framework.Advised;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.StepListener;
import org.springframework.batch.core.listener.ChunkListenerSupport;
import org.springframework.batch.core.listener.ItemListenerSupport;
import org.springframework.batch.core.listener.StepExecutionListenerSupport;
import org.springframework.batch.core.step.tasklet.TaskletStep;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.util.ReflectionTestUtils;

/**
 * @author Dan Garrette
 * @since 2.0
 */
@ContextConfiguration
@RunWith(SpringJUnit4ClassRunner.class)
public class StepListenerInStepParserTests {

	@Autowired
	private BeanFactory beanFactory;

	@Test
	public void testListenersAtStepLevel() throws Exception {
		Step step = (Step) beanFactory.getBean("s1");
		List<?> list = getListeners(step);
		assertEquals(1, list.size());
		assertTrue(list.get(0) instanceof StepExecutionListenerSupport);
	}

	@Test
	// TODO: BATCH-1689 (expected=BeanCreationException.class)
	public void testListenersAtStepLevelWrongType() throws Exception {
		Step step = (Step) beanFactory.getBean("s2");
		List<?> list = getListeners(step);
		assertEquals(1, list.size());
		assertTrue(list.get(0) instanceof ChunkListenerSupport);
	}

	@Test
	public void testListenersAtTaskletAndStepLevels() throws Exception {
		Step step = (Step) beanFactory.getBean("s3");
		List<?> list = getListeners(step);
		assertEquals(2, list.size());
		assertTrue(list.get(0) instanceof StepExecutionListenerSupport);
		assertTrue(list.get(1) instanceof ChunkListenerSupport);
	}

	@Test
	public void testListenersAtChunkAndStepLevels() throws Exception {
		Step step = (Step) beanFactory.getBean("s4");
		List<?> list = getListeners(step);
		assertEquals(2, list.size());
		assertTrue(list.get(0) instanceof StepExecutionListenerSupport);
		assertTrue(list.get(1) instanceof ItemListenerSupport);
	}

	@SuppressWarnings("unchecked")
	private List<?> getListeners(Step step) throws Exception {
		assertTrue(step instanceof TaskletStep);

		Object compositeListener = ReflectionTestUtils.getField(step, "stepExecutionListener");
		Object composite = ReflectionTestUtils.getField(compositeListener, "list");
		List<StepListener> proxiedListeners = (List<StepListener>) ReflectionTestUtils.getField(
				composite, "list");
		List<Object> r = new ArrayList<Object>();
		for (Object listener : proxiedListeners) {
			while (listener instanceof Advised) {
				listener = ((Advised) listener).getTargetSource().getTarget();
			}
			r.add(listener);
		}
		compositeListener = ReflectionTestUtils.getField(step, "chunkListener");
		composite = ReflectionTestUtils.getField(compositeListener, "listeners");
		proxiedListeners = (List<StepListener>) ReflectionTestUtils.getField(composite, "list");
		for (Object listener : proxiedListeners) {
			while (listener instanceof Advised) {
				listener = ((Advised) listener).getTargetSource().getTarget();
			}
			r.add(listener);
		}
		try {
			compositeListener = ReflectionTestUtils.getField(
					ReflectionTestUtils.getField(ReflectionTestUtils.getField(
							ReflectionTestUtils.getField(step, "tasklet"), "chunkProvider"), "listener"),
					"itemReadListener");
			composite = ReflectionTestUtils.getField(compositeListener, "listeners");
			proxiedListeners = (List<StepListener>) ReflectionTestUtils.getField(composite, "list");
			for (Object listener : proxiedListeners) {
				while (listener instanceof Advised) {
					listener = ((Advised) listener).getTargetSource().getTarget();
				}
				r.add(listener);
			}
		}
		catch (IllegalArgumentException e) {
			// ignore (not a chunk oriented step)
		}
		return r;
	}
}