/*
 * Copyright 2002-2014 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.cache.jcache.interceptor;

import java.lang.reflect.Method;
import java.util.Comparator;
import javax.cache.annotation.CacheDefaults;
import javax.cache.annotation.CacheKeyGenerator;
import javax.cache.annotation.CacheRemove;
import javax.cache.annotation.CacheRemoveAll;
import javax.cache.annotation.CacheResult;

import org.junit.Before;
import org.junit.Test;

import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.cache.interceptor.CacheResolver;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.cache.jcache.AbstractJCacheTests;
import org.springframework.cache.jcache.support.TestableCacheKeyGenerator;
import org.springframework.cache.jcache.support.TestableCacheResolver;
import org.springframework.cache.jcache.support.TestableCacheResolverFactory;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;

import static org.junit.Assert.*;
import static org.mockito.BDDMockito.*;

/**
 * @author Stephane Nicoll
 */
public class AnnotationCacheOperationSourceTests extends AbstractJCacheTests {

	private final DefaultJCacheOperationSource source = new DefaultJCacheOperationSource();

	private final DefaultListableBeanFactory beanFactory =  new DefaultListableBeanFactory();


	@Before
	public void setUp() {
		source.setCacheResolver(defaultCacheResolver);
		source.setExceptionCacheResolver(defaultExceptionCacheResolver);
		source.setKeyGenerator(defaultKeyGenerator);
		source.setBeanFactory(beanFactory);
		source.afterPropertiesSet();
	}


	@Test
	public void cache() {
		CacheResultOperation op = getDefaultCacheOperation(CacheResultOperation.class, String.class);
		assertDefaults(op);
		assertNull("Exception caching not enabled so resolver should not be set", op.getExceptionCacheResolver());
	}

	@Test
	public void cacheWithException() {
		CacheResultOperation op = getDefaultCacheOperation(CacheResultOperation.class, String.class, boolean.class);
		assertDefaults(op);
		assertEquals(defaultExceptionCacheResolver, op.getExceptionCacheResolver());
		assertEquals("exception", op.getExceptionCacheName());
	}

	@Test
	public void put() {
		CachePutOperation op = getDefaultCacheOperation(CachePutOperation.class, String.class, Object.class);
		assertDefaults(op);
	}

	@Test
	public void remove() {
		CacheRemoveOperation op = getDefaultCacheOperation(CacheRemoveOperation.class, String.class);
		assertDefaults(op);
	}

	@Test
	public void removeAll() {
		CacheRemoveAllOperation op = getDefaultCacheOperation(CacheRemoveAllOperation.class);
		assertEquals(defaultCacheResolver, op.getCacheResolver());
	}

	@Test
	public void noAnnotation() {
		assertNull(getCacheOperation(AnnotatedJCacheableService.class, name.getMethodName()));
	}

	@Test
	public void multiAnnotations() {
		thrown.expect(IllegalStateException.class);
		getCacheOperation(InvalidCases.class, name.getMethodName());
	}

	@Test
	public void defaultCacheNameWithCandidate() {
		Method method = ReflectionUtils.findMethod(Object.class, "toString");
		assertEquals("foo", source.determineCacheName(method, null, "foo"));
	}

	@Test
	public void defaultCacheNameWithDefaults() {
		Method method = ReflectionUtils.findMethod(Object.class, "toString");
		CacheDefaults mock = mock(CacheDefaults.class);
		given(mock.cacheName()).willReturn("");
		assertEquals("java.lang.Object.toString()", source.determineCacheName(method, mock, ""));
	}

	@Test
	public void defaultCacheNameNoDefaults() {
		Method method = ReflectionUtils.findMethod(Object.class, "toString");
		assertEquals("java.lang.Object.toString()", source.determineCacheName(method, null, ""));
	}

	@Test
	public void defaultCacheNameWithParameters() {
		Method method = ReflectionUtils.findMethod(Comparator.class, "compare", Object.class, Object.class);
		assertEquals("java.util.Comparator.compare(java.lang.Object,java.lang.Object)",
				source.determineCacheName(method, null, ""));
	}

	@Test
	public void customCacheResolver() {
		CacheResultOperation operation =
				getCacheOperation(CacheResultOperation.class, CustomService.class, name.getMethodName(), Long.class);
		assertJCacheResolver(operation.getCacheResolver(), TestableCacheResolver.class);
		assertJCacheResolver(operation.getExceptionCacheResolver(), null);
		assertEquals(KeyGeneratorAdapter.class, operation.getKeyGenerator().getClass());
		assertEquals(defaultKeyGenerator, ((KeyGeneratorAdapter) operation.getKeyGenerator()).getTarget());
	}

	@Test
	public void customKeyGenerator() {
		CacheResultOperation operation =
				getCacheOperation(CacheResultOperation.class, CustomService.class, name.getMethodName(), Long.class);
		assertEquals(defaultCacheResolver, operation.getCacheResolver());
		assertNull(operation.getExceptionCacheResolver());
		assertCacheKeyGenerator(operation.getKeyGenerator(), TestableCacheKeyGenerator.class);
	}

	@Test
	public void customKeyGeneratorSpringBean() {
		TestableCacheKeyGenerator bean = new TestableCacheKeyGenerator();
		beanFactory.registerSingleton("fooBar", bean);
		CacheResultOperation operation =
				getCacheOperation(CacheResultOperation.class, CustomService.class, name.getMethodName(), Long.class);
		assertEquals(defaultCacheResolver, operation.getCacheResolver());
		assertNull(operation.getExceptionCacheResolver());
		KeyGeneratorAdapter adapter = (KeyGeneratorAdapter) operation.getKeyGenerator();
		assertSame(bean, adapter.getTarget()); // take bean from context
	}

	@Test
	public void customKeyGeneratorAndCacheResolver() {
		CacheResultOperation operation = getCacheOperation(CacheResultOperation.class,
				CustomServiceWithDefaults.class, name.getMethodName(), Long.class);
		assertJCacheResolver(operation.getCacheResolver(), TestableCacheResolver.class);
		assertJCacheResolver(operation.getExceptionCacheResolver(), null);
		assertCacheKeyGenerator(operation.getKeyGenerator(), TestableCacheKeyGenerator.class);
	}

	@Test
	public void customKeyGeneratorAndCacheResolverWithExceptionName() {
		CacheResultOperation operation = getCacheOperation(CacheResultOperation.class,
				CustomServiceWithDefaults.class, name.getMethodName(), Long.class);
		assertJCacheResolver(operation.getCacheResolver(), TestableCacheResolver.class);
		assertJCacheResolver(operation.getExceptionCacheResolver(), TestableCacheResolver.class);
		assertCacheKeyGenerator(operation.getKeyGenerator(), TestableCacheKeyGenerator.class);
	}

	private void assertDefaults(AbstractJCacheKeyOperation<?> operation) {
		assertEquals(defaultCacheResolver, operation.getCacheResolver());
		assertEquals(KeyGeneratorAdapter.class, operation.getKeyGenerator().getClass());
		assertEquals(defaultKeyGenerator, ((KeyGeneratorAdapter) operation.getKeyGenerator()).getTarget());
	}

	protected <T extends JCacheOperation<?>> T getDefaultCacheOperation(Class<T> operationType, Class<?>... parameterTypes) {
		return getCacheOperation(operationType, AnnotatedJCacheableService.class, name.getMethodName(), parameterTypes);
	}

	protected <T extends JCacheOperation<?>> T getCacheOperation(
			Class<T> operationType, Class<?> targetType, String methodName, Class<?>... parameterTypes) {

		JCacheOperation<?> result = getCacheOperation(targetType, methodName, parameterTypes);
		assertNotNull(result);
		assertEquals(operationType, result.getClass());
		return operationType.cast(result);
	}

	private JCacheOperation<?> getCacheOperation(Class<?> targetType, String methodName, Class<?>... parameterTypes) {
		Method method = ReflectionUtils.findMethod(targetType, methodName, parameterTypes);
		Assert.notNull(method, "requested method '" + methodName + "'does not exist");
		return source.getCacheOperation(method, targetType);
	}

	private void assertJCacheResolver(CacheResolver actual,
			Class<? extends javax.cache.annotation.CacheResolver> expectedTargetType) {

		if (expectedTargetType == null) {
			assertNull(actual);
		}
		else {
			assertEquals("Wrong cache resolver implementation", CacheResolverAdapter.class, actual.getClass());
			CacheResolverAdapter adapter = (CacheResolverAdapter) actual;
			assertEquals("Wrong target JCache implementation", expectedTargetType, adapter.getTarget().getClass());
		}
	}

	private void assertCacheKeyGenerator(KeyGenerator actual,
			Class<? extends CacheKeyGenerator> expectedTargetType) {
		assertEquals("Wrong cache resolver implementation", KeyGeneratorAdapter.class, actual.getClass());
		KeyGeneratorAdapter adapter = (KeyGeneratorAdapter) actual;
		assertEquals("Wrong target CacheKeyGenerator implementation", expectedTargetType, adapter.getTarget().getClass());
	}


	static class CustomService {

		@CacheResult(cacheKeyGenerator = TestableCacheKeyGenerator.class)
		public Object customKeyGenerator(Long id) {
			return null;
		}

		@CacheResult(cacheKeyGenerator = TestableCacheKeyGenerator.class)
		public Object customKeyGeneratorSpringBean(Long id) {
			return null;
		}

		@CacheResult(cacheResolverFactory = TestableCacheResolverFactory.class)
		public Object customCacheResolver(Long id) {
			return null;
		}
	}


	@CacheDefaults(cacheResolverFactory = TestableCacheResolverFactory.class,
			cacheKeyGenerator = TestableCacheKeyGenerator.class)
	static class CustomServiceWithDefaults {

		@CacheResult
		public Object customKeyGeneratorAndCacheResolver(Long id) {
			return null;
		}

		@CacheResult(exceptionCacheName = "exception")
		public Object customKeyGeneratorAndCacheResolverWithExceptionName(Long id) {
			return null;
		}
	}


	static class InvalidCases {

		@CacheRemove
		@CacheRemoveAll
		public void multiAnnotations() {
		}
	}

}
