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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.code.pojo;

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

import javax.lang.model.element.Modifier;

import br.com.objectos.code.Code;
import br.com.objectos.code.MethodInfo;
import br.com.objectos.code.SimpleTypeInfo;
import br.com.objectos.code.TypeParameterInfo;
import br.com.objectos.core.auto.AutoPojo;

import com.google.common.collect.ImmutableList;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeName;

/**
 * @author [email protected] (Marcio Endo)
 */
@AutoPojo
abstract class OptionalAttributeMethod extends AttributeMethod {

  abstract TypeName elementTypeName();

  OptionalAttributeMethod() {
  }

  public static OptionalAttributeMethodBuilder builder() {
    return new OptionalAttributeMethodBuilderPojo();
  }

  public static AttributeMethod of(Naming naming, MethodInfo methodInfo, SimpleTypeInfo returnTypeInfo) {
    TypeParameterInfo typeParameterInfo = returnTypeInfo.getTypeParameterInfoStream()
        .findFirst()
        .get();
    TypeName elementTypeName = typeParameterInfo.typeNameBound();
    return OptionalAttributeMethod.builder()
        .naming(naming)
        .accessInfo(methodInfo.accessInfo())
        .name(methodInfo.name())
        .fieldName(methodInfo.fieldName())
        .returnTypeName(returnTypeInfo.typeName())
        .elementTypeName(elementTypeName)
        .build();
  }

  @Override
  Stream builderClassSetter() {
    TypeName returns = naming().builderInnerTypeName(this);
    return Stream.of(
        builderClassSetterStandard(returns),
        builderClassSetterEmpty(returns),
        builderClassSetterOf(returns),
        builderClassSetterOfNullable(returns)
        );
  }

  @Override
  List builderInterfaceMiddle() {
    TypeName returns = naming().builderInnerTypeName(this);
    return ImmutableList. builder()
        .add(builderInterfaceMiddleStandard(returns))
        .add(builderInterfaceMiddleEmpty(returns))
        .add(builderInterfaceMiddleOf(returns))
        .add(builderInterfaceMiddleOfNullable(returns))
        .build();
  }

  private MethodSpec.Builder builderClassSetter(String suffix, TypeName returns, TypeName returnTypeName) {
    MethodSpec.Builder method = MethodSpec.methodBuilder(fieldName() + suffix)
        .addAnnotation(Override.class)
        .addModifiers(Modifier.PUBLIC)
        .returns(returns);

    if (returnTypeName != null) {
      method.addParameter(returnTypeName, fieldName());
    }

    return method;
  }

  private MethodSpec builderClassSetterEmpty(TypeName returns) {
    return builderClassSetter("", returns, null)
        .addStatement("this.$L = $T.empty()", fieldName(), Optional.class)
        .addStatement("return this")
        .build();
  }

  private MethodSpec builderClassSetterOf(TypeName returns) {
    return builderClassSetter("Of", returns, elementTypeName())
        .addStatement("this.$L = $T.of($L)", fieldName(), Optional.class, fieldName())
        .addStatement("return this")
        .build();
  }

  private MethodSpec builderClassSetterOfNullable(TypeName returns) {
    return builderClassSetter("OfNullable", returns, elementTypeName())
        .addStatement("this.$L = $T.ofNullable($L)", fieldName(), Optional.class, fieldName())
        .addStatement("return this")
        .build();
  }

  private MethodSpec builderClassSetterStandard(TypeName returns) {
    return builderClassSetter("", returns, returnTypeName())
        .addCode(Code.nullCheck(fieldName()))
        .addStatement("this.$L = $L", fieldName(), fieldName())
        .addStatement("return this")
        .build();
  }

  private MethodSpec builderInterface(String suffix, TypeName returns, TypeName returnTypeName) {
    MethodSpec.Builder method = MethodSpec.methodBuilder(fieldName() + suffix)
        .addModifiers(Modifier.PUBLIC, Modifier.ABSTRACT)
        .returns(returns);

    if (returnTypeName != null) {
      method.addParameter(returnTypeName, fieldName());
    }

    return method.build();
  }

  private MethodSpec builderInterfaceMiddleEmpty(TypeName returns) {
    return builderInterface("", returns, null);
  }

  private MethodSpec builderInterfaceMiddleOf(TypeName returns) {
    return builderInterface("Of", returns, elementTypeName());
  }

  private MethodSpec builderInterfaceMiddleOfNullable(TypeName returns) {
    return builderInterface("OfNullable", returns, elementTypeName());
  }

  private MethodSpec builderInterfaceMiddleStandard(TypeName returns) {
    return builderInterface("", returns, returnTypeName());
  }

}