/*
 * Copyright 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 io.springlets.boot.test.autoconfigure.web.servlet;

import io.springlets.web.mvc.util.MethodLinkFactory;

import org.springframework.boot.context.TypeExcludeFilter;
import org.springframework.boot.jackson.JsonComponent;
import org.springframework.boot.test.autoconfigure.filter.AnnotationCustomizableTypeExcludeFilter;
import org.springframework.boot.web.servlet.DelegatingFilterProxyRegistrationBean;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.stereotype.Controller;
import org.springframework.util.ObjectUtils;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

/**
 * {@link TypeExcludeFilter} for {@link @SpringletsWebMvcTest}.
 * 
 * This class is a copy of the
 * org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTypeExcludeFilter
 * class used by the Spring Boot's WebMvcTest annotation, just to include the loading of
 * components that implement the {@link MethodLinkFactory} interface, because the original
 * class is package private and can't be extended outside the original package.
 * 
 * @author Cèsar Ordiñana at http://www.disid.com[DISID Corporation S.L.]
 */
public class SpringletsWebMvcExcludeFilter extends AnnotationCustomizableTypeExcludeFilter {

  private static final Set<Class<?>> DEFAULT_INCLUDES;

  static {
    Set<Class<?>> includes = new LinkedHashSet<Class<?>>();
    includes.add(ControllerAdvice.class);
    includes.add(JsonComponent.class);
    includes.add(WebMvcConfigurer.class);
    includes.add(javax.servlet.Filter.class);
    includes.add(FilterRegistrationBean.class);
    includes.add(DelegatingFilterProxyRegistrationBean.class);
    includes.add(HandlerMethodArgumentResolver.class);
    includes.add(MethodLinkFactory.class);
    DEFAULT_INCLUDES = Collections.unmodifiableSet(includes);
  }

  private static final Set<Class<?>> DEFAULT_INCLUDES_AND_CONTROLLER;

  static {
    Set<Class<?>> includes = new LinkedHashSet<Class<?>>(DEFAULT_INCLUDES);
    includes.add(Controller.class);
    DEFAULT_INCLUDES_AND_CONTROLLER = Collections.unmodifiableSet(includes);
  }

  private final SpringletsWebMvcTest annotation;

  SpringletsWebMvcExcludeFilter(Class<?> testClass) {
    this.annotation =
        AnnotatedElementUtils.getMergedAnnotation(testClass, SpringletsWebMvcTest.class);
  }

  @Override
  protected boolean hasAnnotation() {
    return this.annotation != null;
  }

  @Override
  protected Filter[] getFilters(FilterType type) {
    switch (type) {
      case INCLUDE:
        return this.annotation.includeFilters();
      case EXCLUDE:
        return this.annotation.excludeFilters();
    }
    throw new IllegalStateException("Unsupported type " + type);
  }

  @Override
  protected boolean isUseDefaultFilters() {
    return this.annotation.useDefaultFilters();
  }


  @Override
  protected Set<Class<?>> getDefaultIncludes() {
    if (ObjectUtils.isEmpty(this.annotation.controllers())) {
      return DEFAULT_INCLUDES_AND_CONTROLLER;
    }
    return DEFAULT_INCLUDES;
  }

  @Override
  protected boolean defaultInclude(MetadataReader metadataReader,
      MetadataReaderFactory metadataReaderFactory) throws IOException {
    if (super.defaultInclude(metadataReader, metadataReaderFactory)) {
      return true;
    }
    for (Class<?> controller : this.annotation.controllers()) {
      if (isTypeOrAnnotated(metadataReader, metadataReaderFactory, controller)) {
        return true;
      }
    }
    return false;
  }

}