/*
 * Copyright (C) 2008 The Guava 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 com.google.common.collect.testing.features;

import junit.framework.TestCase;

import java.lang.annotation.Annotation;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;

/**
 * Since annotations have some reusability issues that force copy and paste
 * all over the place, it's worth having a test to ensure that all our Feature
 * enums have their annotations correctly set up.
 *
 * @author George van den Driessche
 */
public class FeatureEnumTest extends TestCase {
  private static void assertGoodTesterAnnotation(
      Class<? extends Annotation> annotationClass) {
    assertNotNull(
        String.format("%s must be annotated with @TesterAnnotation.",
            annotationClass),
        annotationClass.getAnnotation(TesterAnnotation.class));
    final Retention retentionPolicy =
        annotationClass.getAnnotation(Retention.class);
    assertNotNull(
        String.format("%s must have a @Retention annotation.", annotationClass),
        retentionPolicy);
    assertEquals(
        String.format("%s must have RUNTIME RetentionPolicy.", annotationClass),
        RetentionPolicy.RUNTIME, retentionPolicy.value());
    assertNotNull(
        String.format("%s must be inherited.", annotationClass),
        annotationClass.getAnnotation(Inherited.class));

    for (String propertyName : new String[]{"value", "absent"}) {
      Method method = null;
      try {
        method = annotationClass.getMethod(propertyName);
      } catch (NoSuchMethodException e) {
        fail(String.format("%s must have a property named '%s'.",
            annotationClass, propertyName));
      }
      final Class<?> returnType = method.getReturnType();
      assertTrue(String.format("%s.%s() must return an array.",
          annotationClass, propertyName),
          returnType.isArray());
      assertSame(String.format("%s.%s() must return an array of %s.",
          annotationClass, propertyName, annotationClass.getDeclaringClass()),
          annotationClass.getDeclaringClass(), returnType.getComponentType());
    }
  }

  // This is public so that tests for Feature enums we haven't yet imagined
  // can reuse it.
  public static <E extends Enum<?> & Feature<?>> void assertGoodFeatureEnum(
      Class<E> featureEnumClass) {
    final Class<?>[] classes = featureEnumClass.getDeclaredClasses();
    for (Class<?> containedClass : classes) {
      if (containedClass.getSimpleName().equals("Require")) {
        if (containedClass.isAnnotation()) {
          assertGoodTesterAnnotation(asAnnotation(containedClass));
        } else {
          fail(String.format("Feature enum %s contains a class named " +
              "'Require' but it is not an annotation.", featureEnumClass));
        }
        return;
      }
    }
    fail(String.format("Feature enum %s should contain an " +
        "annotation named 'Require'.", featureEnumClass));
  }

  @SuppressWarnings("unchecked")
  private static Class<? extends Annotation> asAnnotation(Class<?> clazz) {
    if (clazz.isAnnotation()) {
      return (Class<? extends Annotation>) clazz;
    } else {
      throw new IllegalArgumentException(
          String.format("%s is not an annotation.", clazz));
    }
  }

  public void testFeatureEnums() throws Exception {
    assertGoodFeatureEnum(CollectionFeature.class);
    assertGoodFeatureEnum(ListFeature.class);
    assertGoodFeatureEnum(SetFeature.class);
    assertGoodFeatureEnum(CollectionSize.class);
    assertGoodFeatureEnum(MapFeature.class);
  }
}