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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.io.compiler;

import java.util.Optional;

import javax.lang.model.element.Modifier;

import br.com.objectos.code.AnnotationInfo;
import br.com.objectos.code.MethodInfo;
import br.com.objectos.io.flat.annotation.Prefix;

import com.squareup.javapoet.FieldSpec;

/**
 * @author [email protected] (Marcio Endo)
 */
class FixedMethod extends FieldMethod {

  private FixedMethod(MethodInfo methodInfo, AnnotationInfo fieldAnnotation) {
    super(methodInfo, fieldAnnotation);
  }

  public static FieldMethod code(MethodInfo methodInfo, AnnotationInfo fieldAnnotation) {
    Optional maybePrefix = methodInfo.annotationInfo(Prefix.class);
    return maybePrefix.isPresent()
        ? new WithPrefix(methodInfo, fieldAnnotation)
        : new FixedMethod(methodInfo, fieldAnnotation);
  }

  @Override
  public FieldSpec pojoFieldSpec() {
    return methodInfo.fieldWriter()
        .modifiers(Modifier.PRIVATE, Modifier.STATIC, Modifier.FINAL)
        .initializer("$S", fieldAnnotationStringValue("value"))
        .write();
  }

  @Override
  public Optional parserFieldSpec() {
    return Optional.of(pojoFieldSpec());
  }

  @Override
  void recordBuilderCode(Body body) {
    // noop
  }

  @Override
  void recordReaderCode(Body body) {
    recordWriterCode(body);
  }

  @Override
  void recordWriterCode(Body body) {
    body.add(".fixed($L)", methodInfo.fieldName());
  }

  private static class WithPrefix extends FixedMethod {

    public WithPrefix(MethodInfo methodInfo, AnnotationInfo fieldAnnotation) {
      super(methodInfo, fieldAnnotation);
    }

    @Override
    public boolean prefixMethod() {
      return true;
    }

  }

}