/*
 * Copyright 2012-2016 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.boot.test.autoconfigure.restdocs;

import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.restdocs.ManualRestDocumentation;
import org.springframework.test.context.TestContext;
import org.springframework.test.context.TestExecutionListener;
import org.springframework.test.context.support.AbstractTestExecutionListener;
import org.springframework.util.ClassUtils;

/**
 * A {@link TestExecutionListener} for Spring REST Docs that removes the need for a
 * <code>@Rule</code> when using JUnit or manual before and after test calls when using
 * TestNG.
 *
 * @author Andy Wilkinson
 * @since 1.4.0
 */
public class RestDocsTestExecutionListener extends AbstractTestExecutionListener {

	private static final String REST_DOCS_CLASS = "org.springframework.restdocs.ManualRestDocumentation";

	@Override
	public void beforeTestMethod(TestContext testContext) throws Exception {
		if (restDocsIsPresent()) {
			new DocumentationHandler().beforeTestMethod(testContext);
		}
	}

	@Override
	public void afterTestMethod(TestContext testContext) throws Exception {
		if (restDocsIsPresent()) {
			new DocumentationHandler().afterTestMethod(testContext);
		}
	}

	private boolean restDocsIsPresent() {
		return ClassUtils.isPresent(REST_DOCS_CLASS, getClass().getClassLoader());
	}

	private static class DocumentationHandler {

		private void beforeTestMethod(TestContext testContext) throws Exception {
			ManualRestDocumentation restDocumentation = findManualRestDocumentation(
					testContext);
			if (restDocumentation != null) {
				restDocumentation.beforeTest(testContext.getTestClass(),
						testContext.getTestMethod().getName());
			}
		}

		private void afterTestMethod(TestContext testContext) {
			ManualRestDocumentation restDocumentation = findManualRestDocumentation(
					testContext);
			if (restDocumentation != null) {
				restDocumentation.afterTest();
			}
		}

		private ManualRestDocumentation findManualRestDocumentation(
				TestContext testContext) {
			try {
				return testContext.getApplicationContext()
						.getBean(ManualRestDocumentation.class);
			}
			catch (NoSuchBeanDefinitionException ex) {
				return null;
			}
		}

	}

}
