/*
 * Copyright 2002-2020 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.core.annotation;

import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.AnnotatedElement;
import java.util.Set;
import java.util.stream.Stream;

import org.assertj.core.api.ThrowableTypeAssert;
import org.junit.jupiter.api.Test;

import org.springframework.core.annotation.MergedAnnotations.SearchStrategy;

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

/**
 * Tests for {@link MergedAnnotations} and {@link RepeatableContainers} that
 * verify support for repeatable annotations.
 *
 * @author Phillip Webb
 * @author Sam Brannen
 */
class MergedAnnotationsRepeatableAnnotationTests {

	// See SPR-13973

	@Test
	void inheritedAnnotationsWhenNonRepeatableThrowsException() {
		assertThatIllegalArgumentException().isThrownBy(() ->
				getAnnotations(null, NonRepeatable.class, SearchStrategy.INHERITED_ANNOTATIONS, getClass()))
			.satisfies(this::nonRepeatableRequirements);
	}

	@Test
	void inheritedAnnotationsWhenContainerMissingValueAttributeThrowsException() {
		assertThatAnnotationConfigurationException().isThrownBy(() ->
				getAnnotations(ContainerMissingValueAttribute.class, InvalidRepeatable.class,
						SearchStrategy.INHERITED_ANNOTATIONS, getClass()))
			.satisfies(this::missingValueAttributeRequirements);
	}

	@Test
	void inheritedAnnotationsWhenWhenNonArrayValueAttributeThrowsException() {
		assertThatAnnotationConfigurationException().isThrownBy(() ->
				getAnnotations(ContainerWithNonArrayValueAttribute.class, InvalidRepeatable.class,
						SearchStrategy.INHERITED_ANNOTATIONS, getClass()))
			.satisfies(this::nonArrayValueAttributeRequirements);
	}

	@Test
	void inheritedAnnotationsWhenWrongComponentTypeThrowsException() {
		assertThatAnnotationConfigurationException().isThrownBy(() ->
				getAnnotations(ContainerWithArrayValueAttributeButWrongComponentType.class,
						InvalidRepeatable.class, SearchStrategy.INHERITED_ANNOTATIONS, getClass()))
			.satisfies(this::wrongComponentTypeRequirements);
	}

	@Test
	void inheritedAnnotationsWhenOnClassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.INHERITED_ANNOTATIONS, RepeatableClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void inheritedAnnotationsWhenWhenOnSuperclassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.INHERITED_ANNOTATIONS, SubRepeatableClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void inheritedAnnotationsWhenComposedOnClassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.INHERITED_ANNOTATIONS, ComposedRepeatableClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void inheritedAnnotationsWhenComposedMixedWithContainerOnClassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.INHERITED_ANNOTATIONS,
				ComposedRepeatableMixedWithContainerClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void inheritedAnnotationsWhenComposedContainerForRepeatableOnClassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.INHERITED_ANNOTATIONS, ComposedContainerClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void inheritedAnnotationsWhenNoninheritedComposedRepeatableOnClassReturnsAnnotations() {
		Set<Noninherited> annotations = getAnnotations(null, Noninherited.class,
				SearchStrategy.INHERITED_ANNOTATIONS, NoninheritedRepeatableClass.class);
		assertThat(annotations.stream().map(Noninherited::value)).containsExactly("A",
				"B", "C");
	}

	@Test
	void inheritedAnnotationsWhenNoninheritedComposedRepeatableOnSuperclassReturnsAnnotations() {
		Set<Noninherited> annotations = getAnnotations(null, Noninherited.class,
				SearchStrategy.INHERITED_ANNOTATIONS,
				SubNoninheritedRepeatableClass.class);
		assertThat(annotations).isEmpty();
	}

	@Test
	void typeHierarchyWhenNonRepeatableThrowsException() {
		assertThatIllegalArgumentException().isThrownBy(() ->
				getAnnotations(null, NonRepeatable.class, SearchStrategy.TYPE_HIERARCHY, getClass()))
			.satisfies(this::nonRepeatableRequirements);
	}

	@Test
	void typeHierarchyWhenContainerMissingValueAttributeThrowsException() {
		assertThatAnnotationConfigurationException().isThrownBy(() ->
				getAnnotations(ContainerMissingValueAttribute.class, InvalidRepeatable.class,
						SearchStrategy.TYPE_HIERARCHY, getClass()))
			.satisfies(this::missingValueAttributeRequirements);
	}

	@Test
	void typeHierarchyWhenWhenNonArrayValueAttributeThrowsException() {
		assertThatAnnotationConfigurationException().isThrownBy(() ->
				getAnnotations(ContainerWithNonArrayValueAttribute.class, InvalidRepeatable.class,
						SearchStrategy.TYPE_HIERARCHY, getClass()))
			.satisfies(this::nonArrayValueAttributeRequirements);
	}

	@Test
	void typeHierarchyWhenWrongComponentTypeThrowsException() {
		assertThatAnnotationConfigurationException().isThrownBy(() ->
				getAnnotations(ContainerWithArrayValueAttributeButWrongComponentType.class,
						InvalidRepeatable.class, SearchStrategy.TYPE_HIERARCHY, getClass()))
			.satisfies(this::wrongComponentTypeRequirements);
	}

	@Test
	void typeHierarchyWhenOnClassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.TYPE_HIERARCHY, RepeatableClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void typeHierarchyWhenWhenOnSuperclassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.TYPE_HIERARCHY, SubRepeatableClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void typeHierarchyWhenComposedOnClassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.TYPE_HIERARCHY, ComposedRepeatableClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void typeHierarchyWhenComposedMixedWithContainerOnClassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.TYPE_HIERARCHY,
				ComposedRepeatableMixedWithContainerClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void typeHierarchyWhenComposedContainerForRepeatableOnClassReturnsAnnotations() {
		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class,
				SearchStrategy.TYPE_HIERARCHY, ComposedContainerClass.class);
		assertThat(annotations.stream().map(PeteRepeat::value)).containsExactly("A", "B",
				"C");
	}

	@Test
	void typeHierarchyAnnotationsWhenNoninheritedComposedRepeatableOnClassReturnsAnnotations() {
		Set<Noninherited> annotations = getAnnotations(null, Noninherited.class,
				SearchStrategy.TYPE_HIERARCHY, NoninheritedRepeatableClass.class);
		assertThat(annotations.stream().map(Noninherited::value)).containsExactly("A",
				"B", "C");
	}

	@Test
	void typeHierarchyAnnotationsWhenNoninheritedComposedRepeatableOnSuperclassReturnsAnnotations() {
		Set<Noninherited> annotations = getAnnotations(null, Noninherited.class,
				SearchStrategy.TYPE_HIERARCHY, SubNoninheritedRepeatableClass.class);
		assertThat(annotations.stream().map(Noninherited::value)).containsExactly("A",
				"B", "C");
	}

	@Test
	void typeHierarchyAnnotationsWithLocalComposedAnnotationWhoseRepeatableMetaAnnotationsAreFiltered() {
		Class<WithRepeatedMetaAnnotationsClass> element = WithRepeatedMetaAnnotationsClass.class;
		SearchStrategy searchStrategy = SearchStrategy.TYPE_HIERARCHY;
		AnnotationFilter annotationFilter = PeteRepeat.class.getName()::equals;

		Set<PeteRepeat> annotations = getAnnotations(null, PeteRepeat.class, searchStrategy, element, annotationFilter);
		assertThat(annotations).isEmpty();

		MergedAnnotations mergedAnnotations = MergedAnnotations.from(element, searchStrategy,
				RepeatableContainers.standardRepeatables(), annotationFilter);
		Stream<Class<? extends Annotation>> annotationTypes = mergedAnnotations.stream()
				.map(MergedAnnotation::synthesize)
				.map(Annotation::annotationType);
		assertThat(annotationTypes).containsExactly(WithRepeatedMetaAnnotations.class, Noninherited.class, Noninherited.class);
	}

	private <A extends Annotation> Set<A> getAnnotations(Class<? extends Annotation> container,
			Class<A> repeatable, SearchStrategy searchStrategy, AnnotatedElement element) {

		return getAnnotations(container, repeatable, searchStrategy, element, AnnotationFilter.PLAIN);
	}

	private <A extends Annotation> Set<A> getAnnotations(Class<? extends Annotation> container,
			Class<A> repeatable, SearchStrategy searchStrategy, AnnotatedElement element, AnnotationFilter annotationFilter) {

		RepeatableContainers containers = RepeatableContainers.of(repeatable, container);
		MergedAnnotations annotations = MergedAnnotations.from(element, searchStrategy, containers, annotationFilter);
		return annotations.stream(repeatable).collect(MergedAnnotationCollectors.toAnnotationSet());
	}

	private void nonRepeatableRequirements(Exception ex) {
		assertThat(ex.getMessage()).startsWith(
				"Annotation type must be a repeatable annotation").contains(
						"failed to resolve container type for",
						NonRepeatable.class.getName());
	}

	private void missingValueAttributeRequirements(Exception ex) {
		assertThat(ex.getMessage()).startsWith(
				"Invalid declaration of container type").contains(
						ContainerMissingValueAttribute.class.getName(),
						"for repeatable annotation", InvalidRepeatable.class.getName());
		assertThat(ex).hasCauseInstanceOf(NoSuchMethodException.class);
	}

	private void nonArrayValueAttributeRequirements(Exception ex) {
		assertThat(ex.getMessage()).startsWith("Container type").contains(
				ContainerWithNonArrayValueAttribute.class.getName(),
				"must declare a 'value' attribute for an array of type",
				InvalidRepeatable.class.getName());
	}

	private void wrongComponentTypeRequirements(Exception ex) {
		assertThat(ex.getMessage()).startsWith("Container type").contains(
				ContainerWithArrayValueAttributeButWrongComponentType.class.getName(),
				"must declare a 'value' attribute for an array of type",
				InvalidRepeatable.class.getName());
	}

	private static ThrowableTypeAssert<AnnotationConfigurationException> assertThatAnnotationConfigurationException() {
		return assertThatExceptionOfType(AnnotationConfigurationException.class);
	}

	@Retention(RetentionPolicy.RUNTIME)
	@interface NonRepeatable {

	}

	@Retention(RetentionPolicy.RUNTIME)
	@interface ContainerMissingValueAttribute {

		// InvalidRepeatable[] value();

	}

	@Retention(RetentionPolicy.RUNTIME)
	@interface ContainerWithNonArrayValueAttribute {

		InvalidRepeatable value();

	}

	@Retention(RetentionPolicy.RUNTIME)
	@interface ContainerWithArrayValueAttributeButWrongComponentType {

		String[] value();

	}

	@Retention(RetentionPolicy.RUNTIME)
	@interface InvalidRepeatable {

	}

	@Retention(RetentionPolicy.RUNTIME)
	@Inherited
	@interface PeteRepeats {

		PeteRepeat[] value();

	}

	@Retention(RetentionPolicy.RUNTIME)
	@Inherited
	@Repeatable(PeteRepeats.class)
	@interface PeteRepeat {

		String value();

	}

	@PeteRepeat("shadowed")
	@Target({ ElementType.METHOD, ElementType.TYPE })
	@Retention(RetentionPolicy.RUNTIME)
	@Inherited
	@interface ForPetesSake {

		@AliasFor(annotation = PeteRepeat.class)
		String value();

	}

	@PeteRepeat("shadowed")
	@Target({ ElementType.METHOD, ElementType.TYPE })
	@Retention(RetentionPolicy.RUNTIME)
	@Inherited
	@interface ForTheLoveOfFoo {

		@AliasFor(annotation = PeteRepeat.class)
		String value();

	}

	@PeteRepeats({ @PeteRepeat("B"), @PeteRepeat("C") })
	@Target({ ElementType.METHOD, ElementType.TYPE })
	@Retention(RetentionPolicy.RUNTIME)
	@Inherited
	@interface ComposedContainer {

	}

	@PeteRepeat("A")
	@PeteRepeats({ @PeteRepeat("B"), @PeteRepeat("C") })
	static class RepeatableClass {

	}

	static class SubRepeatableClass extends RepeatableClass {

	}

	@ForPetesSake("B")
	@ForTheLoveOfFoo("C")
	@PeteRepeat("A")
	static class ComposedRepeatableClass {

	}

	@ForPetesSake("C")
	@PeteRepeats(@PeteRepeat("A"))
	@PeteRepeat("B")
	static class ComposedRepeatableMixedWithContainerClass {

	}

	@PeteRepeat("A")
	@ComposedContainer
	static class ComposedContainerClass {

	}

	@Target(ElementType.TYPE)
	@Retention(RetentionPolicy.RUNTIME)
	@interface Noninheriteds {

		Noninherited[] value();

	}

	@Target(ElementType.TYPE)
	@Retention(RetentionPolicy.RUNTIME)
	@Repeatable(Noninheriteds.class)
	@interface Noninherited {

		@AliasFor("name")
		String value() default "";

		@AliasFor("value")
		String name() default "";

	}

	@Noninherited(name = "shadowed")
	@Target(ElementType.TYPE)
	@Retention(RetentionPolicy.RUNTIME)
	@interface ComposedNoninherited {

		@AliasFor(annotation = Noninherited.class)
		String name() default "";

	}

	@ComposedNoninherited(name = "C")
	@Noninheriteds({ @Noninherited(value = "A"), @Noninherited(name = "B") })
	static class NoninheritedRepeatableClass {

	}

	static class SubNoninheritedRepeatableClass extends NoninheritedRepeatableClass {

	}

	@Retention(RetentionPolicy.RUNTIME)
	@PeteRepeat("A")
	@PeteRepeat("B")
	@interface WithRepeatedMetaAnnotations {
	}

	@WithRepeatedMetaAnnotations
	@PeteRepeat("C")
	@Noninherited("X")
	@Noninherited("Y")
	static class WithRepeatedMetaAnnotationsClass {
	}

}
