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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.auto;

import javax.lang.model.element.Modifier;

import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeName;
import com.squareup.javapoet.TypeSpec;

/**
 * @author [email protected] (Marcio Endo)
 */
class ToFunctionMethod extends AbstractHasToFunction {

  public ToFunctionMethod(ToFunction function) {
    super(function);
  }

  public MethodSpec get() {
    return MethodSpec.methodBuilder("apply")
        .addAnnotation(Override.class)
        .addModifiers(Modifier.PUBLIC)
        .returns(returns())
        .addParameter(typeInfo().typeNameRaw(), "input")
        .addCode(returnStatement())
        .build();
  }

  void addTo(TypeSpec.Builder type) {
    type.addMethod(get());
  }

  private TypeName returns() {
    return methodInfo()
        .returnTypeInfo()
        .autobox()
        .typeName();
  }

  private CodeBlock returnStatement() {
    return methodInfo().statementWriter()
        .add("return input.$L(")
        .add("$L").forEachParameter(", ")
        .add(")")
        .setMethodName()
        .setParameterName()
        .write();
  }

}