/*
 * Copyright 2012-2019 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.boot.autoconfigure.thymeleaf;

import java.io.File;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Locale;
import java.util.Map;

import javax.servlet.DispatcherType;

import nz.net.ultraq.thymeleaf.LayoutDialect;
import nz.net.ultraq.thymeleaf.decorators.strategies.GroupingRespectLayoutTitleStrategy;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
import org.thymeleaf.context.WebContext;
import org.thymeleaf.spring5.SpringTemplateEngine;
import org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver;
import org.thymeleaf.spring5.view.ThymeleafView;
import org.thymeleaf.spring5.view.ThymeleafViewResolver;
import org.thymeleaf.templateresolver.ITemplateResolver;

import org.springframework.boot.autoconfigure.AutoConfigurations;
import org.springframework.boot.test.context.FilteredClassLoader;
import org.springframework.boot.test.context.runner.ApplicationContextRunner;
import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
import org.springframework.boot.test.system.CapturedOutput;
import org.springframework.boot.test.system.OutputCaptureExtension;
import org.springframework.boot.testsupport.BuildOutput;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.filter.OrderedCharacterEncodingFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.mock.web.MockServletContext;
import org.springframework.security.authentication.TestingAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.context.SecurityContextImpl;
import org.springframework.test.util.ReflectionTestUtils;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.resource.ResourceUrlEncodingFilter;
import org.springframework.web.servlet.support.RequestContext;

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

/**
 * Tests for {@link ThymeleafAutoConfiguration} in Servlet-based applications.
 *
 * @author Dave Syer
 * @author Stephane Nicoll
 * @author Eddú Meléndez
 * @author Brian Clozel
 * @author Kazuki Shimizu
 * @author Artsiom Yudovin
 */
@ExtendWith(OutputCaptureExtension.class)
class ThymeleafServletAutoConfigurationTests {

	private final BuildOutput buildOutput = new BuildOutput(getClass());

	private final WebApplicationContextRunner contextRunner = new WebApplicationContextRunner()
			.withConfiguration(AutoConfigurations.of(ThymeleafAutoConfiguration.class));

	@Test
	void autoConfigurationBackOffWithoutThymeleafSpring() {
		this.contextRunner.withClassLoader(new FilteredClassLoader("org.thymeleaf.spring5"))
				.run((context) -> assertThat(context).doesNotHaveBean(TemplateEngine.class));
	}

	@Test
	void createFromConfigClass() {
		this.contextRunner.withPropertyValues("spring.thymeleaf.mode:HTML", "spring.thymeleaf.suffix:")
				.run((context) -> {
					assertThat(context).hasSingleBean(TemplateEngine.class);
					TemplateEngine engine = context.getBean(TemplateEngine.class);
					Context attrs = new Context(Locale.UK, Collections.singletonMap("foo", "bar"));
					String result = engine.process("template.html", attrs).trim();
					assertThat(result).isEqualTo("<html>bar</html>");
				});
	}

	@Test
	void overrideCharacterEncoding() {
		this.contextRunner.withPropertyValues("spring.thymeleaf.encoding:UTF-16").run((context) -> {
			ITemplateResolver resolver = context.getBean(ITemplateResolver.class);
			assertThat(resolver).isInstanceOf(SpringResourceTemplateResolver.class);
			assertThat(((SpringResourceTemplateResolver) resolver).getCharacterEncoding()).isEqualTo("UTF-16");
			ThymeleafViewResolver views = context.getBean(ThymeleafViewResolver.class);
			assertThat(views.getCharacterEncoding()).isEqualTo("UTF-16");
			assertThat(views.getContentType()).isEqualTo("text/html;charset=UTF-16");
		});
	}

	@Test
	void overrideDisableProducePartialOutputWhileProcessing() {
		this.contextRunner.withPropertyValues("spring.thymeleaf.servlet.produce-partial-output-while-processing:false")
				.run((context) -> assertThat(
						context.getBean(ThymeleafViewResolver.class).getProducePartialOutputWhileProcessing())
								.isFalse());
	}

	@Test
	void disableProducePartialOutputWhileProcessingIsEnabledByDefault() {
		this.contextRunner.run((context) -> assertThat(
				context.getBean(ThymeleafViewResolver.class).getProducePartialOutputWhileProcessing()).isTrue());
	}

	@Test
	void overrideTemplateResolverOrder() {
		this.contextRunner.withPropertyValues("spring.thymeleaf.templateResolverOrder:25")
				.run((context) -> assertThat(context.getBean(ITemplateResolver.class).getOrder())
						.isEqualTo(Integer.valueOf(25)));
	}

	@Test
	void overrideViewNames() {
		this.contextRunner.withPropertyValues("spring.thymeleaf.viewNames:foo,bar")
				.run((context) -> assertThat(context.getBean(ThymeleafViewResolver.class).getViewNames())
						.isEqualTo(new String[] { "foo", "bar" }));
	}

	@Test
	void overrideEnableSpringElCompiler() {
		this.contextRunner.withPropertyValues("spring.thymeleaf.enable-spring-el-compiler:true")
				.run((context) -> assertThat(context.getBean(SpringTemplateEngine.class).getEnableSpringELCompiler())
						.isTrue());
	}

	@Test
	void enableSpringElCompilerIsDisabledByDefault() {
		this.contextRunner
				.run((context) -> assertThat(context.getBean(SpringTemplateEngine.class).getEnableSpringELCompiler())
						.isFalse());
	}

	@Test
	void overrideRenderHiddenMarkersBeforeCheckboxes() {
		this.contextRunner.withPropertyValues("spring.thymeleaf.render-hidden-markers-before-checkboxes:true")
				.run((context) -> assertThat(
						context.getBean(SpringTemplateEngine.class).getRenderHiddenMarkersBeforeCheckboxes()).isTrue());
	}

	@Test
	void enableRenderHiddenMarkersBeforeCheckboxesIsDisabledByDefault() {
		this.contextRunner.run((context) -> assertThat(
				context.getBean(SpringTemplateEngine.class).getRenderHiddenMarkersBeforeCheckboxes()).isFalse());
	}

	@Test
	void templateLocationDoesNotExist(CapturedOutput capturedOutput) {
		this.contextRunner.withPropertyValues("spring.thymeleaf.prefix:classpath:/no-such-directory/")
				.run((context) -> assertThat(capturedOutput).contains("Cannot find template location"));
	}

	@Test
	void templateLocationEmpty(CapturedOutput capturedOutput) {
		new File(this.buildOutput.getTestResourcesLocation(), "empty-templates/empty-directory").mkdirs();
		this.contextRunner.withPropertyValues("spring.thymeleaf.prefix:classpath:/empty-templates/empty-directory/")
				.run((context) -> assertThat(capturedOutput).doesNotContain("Cannot find template location"));
	}

	@Test
	void createLayoutFromConfigClass() {
		this.contextRunner.run((context) -> {
			ThymeleafView view = (ThymeleafView) context.getBean(ThymeleafViewResolver.class).resolveViewName("view",
					Locale.UK);
			MockHttpServletResponse response = new MockHttpServletResponse();
			MockHttpServletRequest request = new MockHttpServletRequest();
			request.setAttribute(RequestContext.WEB_APPLICATION_CONTEXT_ATTRIBUTE, context);
			view.render(Collections.singletonMap("foo", "bar"), request, response);
			String result = response.getContentAsString();
			assertThat(result).contains("<title>Content</title>");
			assertThat(result).contains("<span>bar</span>");
			context.close();
		});
	}

	@Test
	void useDataDialect() {
		this.contextRunner.run((context) -> {
			TemplateEngine engine = context.getBean(TemplateEngine.class);
			Context attrs = new Context(Locale.UK, Collections.singletonMap("foo", "bar"));
			String result = engine.process("data-dialect", attrs).trim();
			assertThat(result).isEqualTo("<html><body data-foo=\"bar\"></body></html>");
		});
	}

	@Test
	void useJava8TimeDialect() {
		this.contextRunner.run((context) -> {
			TemplateEngine engine = context.getBean(TemplateEngine.class);
			Context attrs = new Context(Locale.UK);
			String result = engine.process("java8time-dialect", attrs).trim();
			assertThat(result).isEqualTo("<html><body>2015-11-24</body></html>");
		});
	}

	@Test
	void useSecurityDialect() {
		this.contextRunner.run((context) -> {
			TemplateEngine engine = context.getBean(TemplateEngine.class);
			WebContext attrs = new WebContext(new MockHttpServletRequest(), new MockHttpServletResponse(),
					new MockServletContext());
			try {
				SecurityContextHolder
						.setContext(new SecurityContextImpl(new TestingAuthenticationToken("alice", "admin")));
				String result = engine.process("security-dialect", attrs);
				assertThat(result).isEqualTo("<html><body><div>alice</div></body></html>" + System.lineSeparator());
			}
			finally {
				SecurityContextHolder.clearContext();
			}
		});
	}

	@Test
	void renderTemplate() {
		this.contextRunner.run((context) -> {
			TemplateEngine engine = context.getBean(TemplateEngine.class);
			Context attrs = new Context(Locale.UK, Collections.singletonMap("foo", "bar"));
			String result = engine.process("home", attrs).trim();
			assertThat(result).isEqualTo("<html><body>bar</body></html>");
		});
	}

	@Test
	void renderNonWebAppTemplate() {
		new ApplicationContextRunner().withConfiguration(AutoConfigurations.of(ThymeleafAutoConfiguration.class))
				.run((context) -> {
					assertThat(context).doesNotHaveBean(ViewResolver.class);
					TemplateEngine engine = context.getBean(TemplateEngine.class);
					Context attrs = new Context(Locale.UK, Collections.singletonMap("greeting", "Hello World"));
					String result = engine.process("message", attrs);
					assertThat(result).contains("Hello World");
				});
	}

	@Test
	void registerResourceHandlingFilterDisabledByDefault() {
		this.contextRunner.run((context) -> assertThat(context).doesNotHaveBean(FilterRegistrationBean.class));
	}

	@Test
	void registerResourceHandlingFilterOnlyIfResourceChainIsEnabled() {
		this.contextRunner.withPropertyValues("spring.resources.chain.enabled:true").run((context) -> {
			FilterRegistrationBean<?> registration = context.getBean(FilterRegistrationBean.class);
			assertThat(registration.getFilter()).isInstanceOf(ResourceUrlEncodingFilter.class);
			assertThat(registration).hasFieldOrPropertyWithValue("dispatcherTypes",
					EnumSet.of(DispatcherType.REQUEST, DispatcherType.ERROR));
		});
	}

	@Test
	@SuppressWarnings("rawtypes")
	void registerResourceHandlingFilterWithOtherRegistrationBean() {
		// gh-14897
		this.contextRunner.withUserConfiguration(FilterRegistrationOtherConfiguration.class)
				.withPropertyValues("spring.resources.chain.enabled:true").run((context) -> {
					Map<String, FilterRegistrationBean> beans = context.getBeansOfType(FilterRegistrationBean.class);
					assertThat(beans).hasSize(2);
					FilterRegistrationBean registration = beans.values().stream()
							.filter((r) -> r.getFilter() instanceof ResourceUrlEncodingFilter).findFirst().get();
					assertThat(registration).hasFieldOrPropertyWithValue("dispatcherTypes",
							EnumSet.of(DispatcherType.REQUEST, DispatcherType.ERROR));
				});
	}

	@Test
	@SuppressWarnings("rawtypes")
	void registerResourceHandlingFilterWithResourceRegistrationBean() {
		// gh-14926
		this.contextRunner.withUserConfiguration(FilterRegistrationResourceConfiguration.class)
				.withPropertyValues("spring.resources.chain.enabled:true").run((context) -> {
					Map<String, FilterRegistrationBean> beans = context.getBeansOfType(FilterRegistrationBean.class);
					assertThat(beans).hasSize(1);
					FilterRegistrationBean registration = beans.values().stream()
							.filter((r) -> r.getFilter() instanceof ResourceUrlEncodingFilter).findFirst().get();
					assertThat(registration).hasFieldOrPropertyWithValue("dispatcherTypes",
							EnumSet.of(DispatcherType.INCLUDE));
				});
	}

	@Test
	void layoutDialectCanBeCustomized() {
		this.contextRunner.withUserConfiguration(LayoutDialectConfiguration.class)
				.run((context) -> assertThat(
						ReflectionTestUtils.getField(context.getBean(LayoutDialect.class), "sortingStrategy"))
								.isInstanceOf(GroupingRespectLayoutTitleStrategy.class));
	}

	@Test
	void cachingCanBeDisabled() {
		this.contextRunner.withPropertyValues("spring.thymeleaf.cache:false").run((context) -> {
			assertThat(context.getBean(ThymeleafViewResolver.class).isCache()).isFalse();
			SpringResourceTemplateResolver templateResolver = context.getBean(SpringResourceTemplateResolver.class);
			assertThat(templateResolver.isCacheable()).isFalse();
		});
	}

	@Configuration(proxyBeanMethods = false)
	static class LayoutDialectConfiguration {

		@Bean
		public LayoutDialect layoutDialect() {
			return new LayoutDialect(new GroupingRespectLayoutTitleStrategy());
		}

	}

	@Configuration(proxyBeanMethods = false)
	static class FilterRegistrationResourceConfiguration {

		@Bean
		public FilterRegistrationBean<ResourceUrlEncodingFilter> filterRegistration() {
			FilterRegistrationBean<ResourceUrlEncodingFilter> bean = new FilterRegistrationBean<>(
					new ResourceUrlEncodingFilter());
			bean.setDispatcherTypes(EnumSet.of(DispatcherType.INCLUDE));
			return bean;
		}

	}

	@Configuration(proxyBeanMethods = false)
	static class FilterRegistrationOtherConfiguration {

		@Bean
		public FilterRegistrationBean<OrderedCharacterEncodingFilter> filterRegistration() {
			return new FilterRegistrationBean<>(new OrderedCharacterEncodingFilter());
		}

	}

}
