/*
 * Copyright 2002-2021 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
 *
 *      https://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.context.annotation;

import java.io.ByteArrayOutputStream;
import java.io.PrintWriter;

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.BeanCreationException;
import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;

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

/**
 * @author Andy Wilkinson
 * @author Liu Dongmiao
 */
public class AggressiveFactoryBeanInstantiationTests {

	@Test
	public void directlyRegisteredFactoryBean() {
		try (AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext()) {
			context.register(SimpleFactoryBean.class);
			context.addBeanFactoryPostProcessor(factory ->
				BeanFactoryUtils.beanNamesForTypeIncludingAncestors(factory, String.class)
			);
			context.refresh();
		}
	}

	@Test
	public void beanMethodFactoryBean() {
		try (AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext()) {
			context.register(BeanMethodConfiguration.class);
			context.addBeanFactoryPostProcessor(factory ->
				BeanFactoryUtils.beanNamesForTypeIncludingAncestors(factory, String.class)
			);
			context.refresh();
		}
	}

	@Test
	public void checkLinkageError() {
		try (AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext()) {
			context.register(BeanMethodConfigurationWithExceptionInInitializer.class);
			context.refresh();
			fail("Should have thrown BeanCreationException");
		}
		catch (BeanCreationException ex) {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			PrintWriter pw = new PrintWriter(baos);
			ex.printStackTrace(pw);
			pw.flush();
			String stackTrace = baos.toString();
			assertThat(stackTrace.contains(".<clinit>")).isTrue();
			assertThat(stackTrace.contains("java.lang.NoClassDefFoundError")).isFalse();
		}
	}


	@Configuration
	static class BeanMethodConfiguration {

		@Bean
		public String foo() {
			return "foo";
		}

		@Bean
		public AutowiredBean autowiredBean() {
			return new AutowiredBean();
		}

		@Bean
		@DependsOn("autowiredBean")
		public SimpleFactoryBean simpleFactoryBean(ApplicationContext applicationContext) {
			return new SimpleFactoryBean(applicationContext);
		}
	}


	@Configuration
	static class BeanMethodConfigurationWithExceptionInInitializer extends BeanMethodConfiguration {

		@Bean
		@DependsOn("autowiredBean")
		@Override
		public SimpleFactoryBean simpleFactoryBean(ApplicationContext applicationContext) {
			new ExceptionInInitializer();
			return new SimpleFactoryBean(applicationContext);
		}
	}


	static class AutowiredBean {

		@Autowired
		String foo;
	}


	static class SimpleFactoryBean implements FactoryBean<Object> {

		public SimpleFactoryBean(ApplicationContext applicationContext) {
		}

		@Override
		public Object getObject() {
			return new Object();
		}

		@Override
		public Class<?> getObjectType() {
			return Object.class;
		}
	}


	static class ExceptionInInitializer {

		@SuppressWarnings("unused")
		private static final int ERROR = callInClinit();

		private static int callInClinit() {
			throw new UnsupportedOperationException();
		}
	}

}
