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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 static com.google.common.collect.Lists.newArrayListWithCapacity;

import java.util.List;

import javax.lang.model.element.Modifier;

import com.google.common.collect.ImmutableList;
import com.squareup.javapoet.AnnotationSpec;
import com.squareup.javapoet.JavaFile;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeSpec;

/**
 * @author [email protected] (Marcio Endo)
 */
class BuilderInterface extends AbstractHasPojoInfo {

  public BuilderInterface(PojoInfo info) {
    super(info);
  }

  public JavaFile generate(AnnotationSpec annotationSpec) {
    return generate(type(annotationSpec));
  }

  List firstMethod() {
    List methodList = builderMethodList();
    return methodList.isEmpty()
        ? build()
        : middle(methodList.get(0));
  }

  List inner() {
    List methodList = builderMethodList();
    int index = 0;
    int size = methodList.size();

    List typeSpecList = newArrayListWithCapacity(size);
    for (AttributeMethod method : methodList) {
      String innerSimpleName = naming().builderInnerSimpleName(method);
      TypeSpec.Builder inner = TypeSpec.interfaceBuilder(innerSimpleName)
          .addModifiers(Modifier.PUBLIC, Modifier.STATIC)
          .addMethods(methodSpec(methodList, ++index, size));

      naming().typeVariableNameUnboundedListTo(inner);

      typeSpecList.add(inner.build());
    }

    return typeSpecList;
  }

  TypeSpec type(AnnotationSpec annotationSpec) {
    TypeSpec.Builder type = TypeSpec.interfaceBuilder(naming().builderInterfaceSimpleName())
        .addModifiers(accessInfo().modifiers())
        .addAnnotation(annotationSpec);

    naming().typeVariableNameListTo(type);

    return type
        .addMethods(firstMethod())
        .addTypes(inner())
        .build();
  }

  private List build() {
    MethodSpec methodSpec = MethodSpec.methodBuilder("build")
        .addModifiers(Modifier.PUBLIC, Modifier.ABSTRACT)
        .returns(naming().superClassTypeNameUnbounded())
        .build();
    return ImmutableList.of(methodSpec);
  }

  private List methodSpec(List methodList, int index, int size) {
    return index == size
        ? build()
        : middle(methodList.get(index));
  }

  private List middle(AttributeMethod method) {
    return method.builderInterfaceMiddle();
  }

}