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/*
 * Copyright 2014 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.code;

import java.util.List;
import java.util.stream.Stream;

import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;

import br.com.objectos.core.util.ImmutableList;
import br.com.objectos.lazy.Lazy;

/**
 * @author [email protected] (Marcio Endo)
 */
class PackageInfoPackageElement extends PackageInfo {

  private static final PackageInfo NULL = new Null();

  private final ProcessingEnvironmentWrapper processingEnv;
  private final PackageElement element;
  private final Lazy> annotationInfoList = new LazyAnnotationInfoList();

  private PackageInfoPackageElement(ProcessingEnvironmentWrapper processingEnv, PackageElement element) {
    this.processingEnv = processingEnv;
    this.element = element;
  }

  public static PackageInfo wrap(ProcessingEnvironmentWrapper processingEnv, PackageElement element) {
    return element == null
        ? NULL
        : new PackageInfoPackageElement(processingEnv, element);
  }

  @Override
  public List annotationInfoList() {
    return annotationInfoList.get();
  }

  @Override
  public Stream declaredTypeInfoStream() {
    return element.getEnclosedElements()
        .stream()
        .filter(el -> Util.isTypeInfoKind(el))
        .map(TypeElement.class::cast)
        .map(el -> TypeInfoTypeElement.wrap(processingEnv, el));
  }

  @Override
  public PackageInfo parentPackageInfo() {
    PackageElement element = processingEnv.getPackageElement(parentName());
    return new PackageInfoPackageElement(processingEnv, element);
  }

  @Override
  String name() {
    return element.getQualifiedName().toString();
  }

  private class LazyAnnotationInfoList extends Lazy> {
    @Override
    protected List compute() {
      return AnnotationMirrorWrapper.wrapAllAndList(processingEnv, element);
    }
  }

  private static class Null extends PackageInfo {

    @Override
    public List annotationInfoList() {
      return ImmutableList.of();
    }

    @Override
    public Stream declaredTypeInfoStream() {
      return Stream.of();
    }

    @Override
    String name() {
      return null;
    }

  }

}