/*
 * Copyright 2002-2013 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.transaction.annotation;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

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

import javax.sql.DataSource;

import org.junit.Ignore;
import org.junit.Test;
import org.springframework.aop.Advisor;
import org.springframework.aop.framework.Advised;
import org.springframework.aop.support.AopUtils;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.cache.concurrent.ConcurrentMapCache;
import org.springframework.cache.support.SimpleCacheManager;
import org.springframework.context.annotation.AdviceMode;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
import org.springframework.stereotype.Repository;
import org.springframework.tests.transaction.CallCountingTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.interceptor.BeanFactoryTransactionAttributeSourceAdvisor;

/**
 * Integration tests for the @EnableTransactionManagement annotation.
 *
 * @author Chris Beams
 * @since 3.1
 */
public class EnableTransactionManagementIntegrationTests {

	@Test
	public void repositoryIsNotTxProxy() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(Config.class);
		ctx.refresh();

		try {
			assertTxProxying(ctx);
			fail("expected exception");
		} catch (AssertionError ex) {
			assertThat(ex.getMessage(), equalTo("FooRepository is not a TX proxy"));
		}
	}

	@Test
	public void repositoryIsTxProxy_withDefaultTxManagerName() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(Config.class, DefaultTxManagerNameConfig.class);
		ctx.refresh();

		assertTxProxying(ctx);
	}

	@Test
	public void repositoryIsTxProxy_withCustomTxManagerName() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(Config.class, CustomTxManagerNameConfig.class);
		ctx.refresh();

		assertTxProxying(ctx);
	}

	@Ignore @Test // TODO SPR-8207
	public void repositoryIsTxProxy_withNonConventionalTxManagerName_fallsBackToByTypeLookup() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(Config.class, NonConventionalTxManagerNameConfig.class);
		ctx.refresh();

		assertTxProxying(ctx);
	}

	@Test
	public void repositoryIsClassBasedTxProxy() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(Config.class, ProxyTargetClassTxConfig.class);
		ctx.refresh();

		assertTxProxying(ctx);
		assertThat(AopUtils.isCglibProxy(ctx.getBean(FooRepository.class)), is(true));
	}

	@Test
	public void repositoryUsesAspectJAdviceMode() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(Config.class, AspectJTxConfig.class);
		try {
			ctx.refresh();
		}
		catch (Exception ex) {
			// this test is a bit fragile, but gets the job done, proving that an
			// attempt was made to look up the AJ aspect. It's due to classpath issues
			// in .integration-tests that it's not found.
			assertTrue(ex.getMessage().contains("AspectJTransactionManagementConfiguration"));
		}
	}

	@Test
	public void implicitTxManager() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(ImplicitTxManagerConfig.class);
		ctx.refresh();

		FooRepository fooRepository = ctx.getBean(FooRepository.class);
		fooRepository.findAll();

		CallCountingTransactionManager txManager = ctx.getBean(CallCountingTransactionManager.class);
		assertThat(txManager.begun, equalTo(1));
		assertThat(txManager.commits, equalTo(1));
		assertThat(txManager.rollbacks, equalTo(0));
	}

	@Test
	public void explicitTxManager() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(ExplicitTxManagerConfig.class);
		ctx.refresh();

		FooRepository fooRepository = ctx.getBean(FooRepository.class);
		fooRepository.findAll();

		CallCountingTransactionManager txManager1 = ctx.getBean("txManager1", CallCountingTransactionManager.class);
		assertThat(txManager1.begun, equalTo(1));
		assertThat(txManager1.commits, equalTo(1));
		assertThat(txManager1.rollbacks, equalTo(0));

		CallCountingTransactionManager txManager2 = ctx.getBean("txManager2", CallCountingTransactionManager.class);
		assertThat(txManager2.begun, equalTo(0));
		assertThat(txManager2.commits, equalTo(0));
		assertThat(txManager2.rollbacks, equalTo(0));
	}

	@Test
	public void apcEscalation() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(EnableTxAndCachingConfig.class);
		ctx.refresh();
	}


	@Configuration
	@EnableTransactionManagement
	@ImportResource("org/springframework/transaction/annotation/enable-caching.xml")
	static class EnableTxAndCachingConfig {
		@Bean
		public PlatformTransactionManager txManager() {
			return new CallCountingTransactionManager();
		}

		@Bean
		public FooRepository fooRepository() {
			return new DummyFooRepository();
		}

		@Bean
		public CacheManager cacheManager() {
			SimpleCacheManager mgr = new SimpleCacheManager();
			ArrayList<Cache> caches = new ArrayList<Cache>();
			caches.add(new ConcurrentMapCache(""));
			mgr.setCaches(caches);
			return mgr;
		}
	}


	@Configuration
	@EnableTransactionManagement
	static class ImplicitTxManagerConfig {
		@Bean
		public PlatformTransactionManager txManager() {
			return new CallCountingTransactionManager();
		}

		@Bean
		public FooRepository fooRepository() {
			return new DummyFooRepository();
		}
	}


	@Configuration
	@EnableTransactionManagement
	static class ExplicitTxManagerConfig implements TransactionManagementConfigurer {
		@Bean
		public PlatformTransactionManager txManager1() {
			return new CallCountingTransactionManager();
		}

		@Bean
		public PlatformTransactionManager txManager2() {
			return new CallCountingTransactionManager();
		}

		@Override
		public PlatformTransactionManager annotationDrivenTransactionManager() {
			return txManager1();
		}

		@Bean
		public FooRepository fooRepository() {
			return new DummyFooRepository();
		}
	}

	private void assertTxProxying(AnnotationConfigApplicationContext ctx) {
		FooRepository repo = ctx.getBean(FooRepository.class);

		boolean isTxProxy = false;
		if (AopUtils.isAopProxy(repo)) {
			for (Advisor advisor : ((Advised)repo).getAdvisors()) {
				if (advisor instanceof BeanFactoryTransactionAttributeSourceAdvisor) {
					isTxProxy = true;
					break;
				}
			}
		}
		assertTrue("FooRepository is not a TX proxy", isTxProxy);

		// trigger a transaction
		repo.findAll();
	}


	@Configuration
	@EnableTransactionManagement
	static class DefaultTxManagerNameConfig {
		@Bean
		PlatformTransactionManager transactionManager(DataSource dataSource) {
			return new DataSourceTransactionManager(dataSource);
		}
	}


	@Configuration
	@EnableTransactionManagement
	static class CustomTxManagerNameConfig {
		@Bean
		PlatformTransactionManager txManager(DataSource dataSource) {
			return new DataSourceTransactionManager(dataSource);
		}
	}


	@Configuration
	@EnableTransactionManagement
	static class NonConventionalTxManagerNameConfig {
		@Bean
		PlatformTransactionManager txManager(DataSource dataSource) {
			return new DataSourceTransactionManager(dataSource);
		}
	}


	@Configuration
	@EnableTransactionManagement(proxyTargetClass=true)
	static class ProxyTargetClassTxConfig {
		@Bean
		PlatformTransactionManager transactionManager(DataSource dataSource) {
			return new DataSourceTransactionManager(dataSource);
		}
	}


	@Configuration
	@EnableTransactionManagement(mode=AdviceMode.ASPECTJ)
	static class AspectJTxConfig {
		@Bean
		PlatformTransactionManager transactionManager(DataSource dataSource) {
			return new DataSourceTransactionManager(dataSource);
		}
	}


	@Configuration
	static class Config {
		@Bean
		FooRepository fooRepository() {
			JdbcFooRepository repos = new JdbcFooRepository();
			repos.setDataSource(dataSource());
			return repos;
		}

		@Bean
		DataSource dataSource() {
			return new EmbeddedDatabaseBuilder()
				.setType(EmbeddedDatabaseType.HSQL)
				.build();
		}
	}


	interface FooRepository {
		List<Object> findAll();
	}


	@Repository
	static class JdbcFooRepository implements FooRepository {

		public void setDataSource(DataSource dataSource) {
		}

		@Override
		@Transactional
		public List<Object> findAll() {
			return Collections.emptyList();
		}
	}

	@Repository
	static class DummyFooRepository implements FooRepository {

		@Override
		@Transactional
		public List<Object> findAll() {
			return Collections.emptyList();
		}
	}
}
