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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.ui.html;

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

import javax.lang.model.element.Modifier;

import br.com.objectos.way.pojo.Pojo;
import br.com.objectos.way.testable.Testable;
import br.com.objectos.ui.html.annotation.Attributes;
import br.com.objectos.ui.html.annotation.Void;
import br.com.objectos.way.code.AnnotationInfo;
import br.com.objectos.way.code.Code;
import br.com.objectos.way.code.MethodInfo;

import com.squareup.javapoet.AnnotationSpec;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.JavaFile;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeSpec;

/**
 * @author [email protected] (Marcio Endo)
 */
@Pojo
abstract class ProtoMethod implements Testable {

  abstract ProtoNaming naming();
  abstract String tagName();
  abstract String classSimpleName();
  abstract ContentModel contentModel();
  abstract List attributeAnnotationList();

  ProtoMethod() {
  }

  public static ProtoMethodBuilder builder() {
    return new ProtoMethodBuilderPojo();
  }

  public static ProtoMethod of(ProtoNaming naming, MethodInfo methodInfo) {
    String tagName = methodInfo.name();
    String name = methodInfo.annotationInfo(br.com.objectos.ui.html.annotation.ClassName.class)
        .flatMap(annotationInfo -> annotationInfo.stringValue("value"))
        .orElse(Code.upperCaseFirstChar(tagName));
    Optional maybeAttributes = methodInfo.annotationInfo(Attributes.class);
    return ProtoMethod.builder()
        .naming(naming)
        .tagName(tagName)
        .classSimpleName(name + "Proto")
        .contentModel(methodInfo.hasAnnotation(Void.class)
            ? ContentModel.VOID
            : ContentModel.NON_VOID)
        .attributeAnnotationList(AttributeAnnotation.list(maybeAttributes))
        .build();
  }

  public JavaFile generate() {
    return naming().generate(type());
  }

  public TypeSpec type() {
    return TypeSpec.classBuilder(classSimpleName())
        .addAnnotation(ProtoSpecProcessor.ANNOTATION_SPEC)
        .addAnnotation(tagNameAnnotation())
        .addModifiers(Modifier.ABSTRACT)
        .addTypeVariable(naming().protoTypeVariableName())
        .superclass(naming().superclassTypeName())
        .addMethod(constructor())
        .addMethods(attributes())
        .build();
  }

  private List attributes() {
    return attributeAnnotationList().stream()
        .map(annotation -> annotation.setter(naming().typeVariableName()))
        .collect(Collectors.toList());
  }

  private MethodSpec constructor() {
    return MethodSpec
        .constructorBuilder()
        .addModifiers(Modifier.PUBLIC)
        .addStatement("super($S, $T.$L)", tagName(), ClassName.get(ContentModel.class), contentModel().name())
        .build();
  }

  private AnnotationSpec tagNameAnnotation() {
    return AnnotationSpec.builder(TagName.class)
        .addMember("value", "$S", tagName())
        .build();
  }

}