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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.way.code;

import java.util.List;
import java.util.Optional;

import br.com.objectos.way.testable.Equality;
import br.com.objectos.way.testable.Testable;
import br.com.objectos.way.testable.Tester;

import com.squareup.javapoet.CodeBlock;

/**
 * @author [email protected] (Marcio Endo)
 */
public abstract class FieldInfo
    implements
    CanGenerateCompilationError,
    HasAnnotationInfoList,
    Testable {

  @Override
  public abstract List annotationInfoList();
  public abstract SimpleTypeInfo simpleTypeInfo();
  public abstract String name();

  FieldInfo() {
  }

  @Override
  public void compilationError(String message) {
  }

  @Override
  public final Equality isEqualTo(Object that) {
    return Tester.of(FieldInfo.class)
        .add("annotationInfoList", o -> o.annotationInfoList())
        .add("simpleTypeInfo", o -> o.simpleTypeInfo())
        .add("name", o -> o.name())
        .test(this, that);
  }

  public CodeBlock writeAssignToField() {
    return CodeBlock.builder()
        .addStatement("this.$L = $L", name(), name())
        .build();
  }

  public Optional writeNullCheck() {
    Optional res = Optional.empty();

    if (!simpleTypeInfo().isPrimitive()) {
      CodeBlock nullCheck = CodeBlock.builder()
          .beginControlFlow("if ($L == null)", name())
          .addStatement("throw new $T()", NullPointerException.class)
          .endControlFlow()
          .build();
      res = Optional.of(nullCheck);
    }

    return res;
  }

}