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/*
 * Copyright 2015 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.way.code;

import java.util.List;

import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Name;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.TypeMirror;

import br.com.objectos.way.core.lang.Lazy;
import br.com.objectos.way.core.util.WayIterables;

import com.google.common.base.Function;

/**
 * @author [email protected] (Marcio Endo)
 */
class ParameterInfoVariableElement extends ParameterInfo {

  private final ProcessingEnvironmentWrapper processingEnv;
  private final VariableElement element;
  private final TypeParameterInfoMap typeParameterInfoMap;

  private final Lazy simpleTypeInfo = new LazySimpleTypeInfo();
  private final Lazy annotationInfoMap = new LazyAnnotationInfoMap();

  private ParameterInfoVariableElement(ProcessingEnvironmentWrapper processingEnv,
                                       VariableElement element,
                                       TypeParameterInfoMap typeParameterInfoMap) {
    this.processingEnv = processingEnv;
    this.element = element;
    this.typeParameterInfoMap = typeParameterInfoMap;
  }

  public static List wrapAll(
      final ProcessingEnvironmentWrapper processingEnv,
      ExecutableElement element,
      final TypeParameterInfoMap typeParameterInfoMap) {

    List parameters = element.getParameters();
    return WayIterables.from(parameters)
        .transform(new Function() {
          @Override
          public ParameterInfo apply(VariableElement input) {
            return new ParameterInfoVariableElement(processingEnv, input, typeParameterInfoMap);
          }
        })
        .toImmutableList();

  }

  @Override
  public SimpleTypeInfo simpleTypeInfo() {
    return simpleTypeInfo.get();
  }

  @Override
  public String name() {
    Name simpleName = element.getSimpleName();
    return simpleName.toString();
  }

  @Override
  public AnnotationInfoMap annotationInfoMap() {
    return annotationInfoMap.get();
  }

  private class LazySimpleTypeInfo extends Lazy {
    @Override
    protected SimpleTypeInfo compute() {
      TypeMirror type = element.asType();
      TypeParameterInfo parameterInfo = TypeParameterInfoTypeMirror.wrap(processingEnv, type);
      TypeParameterInfo translated = typeParameterInfoMap.translate(parameterInfo);
      return translated.toSimpleTypeInfo();
    }
  }

  private class LazyAnnotationInfoMap extends Lazy {
    @Override
    protected AnnotationInfoMap compute() {
      return AnnotationMirrorWrapper.wrapAllAndMap(processingEnv, element);
    }
  }

}