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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.core.testing;

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

import javax.lang.model.element.Modifier;

import br.com.objectos.pojo.plugin.Naming;
import br.com.objectos.pojo.plugin.Property;
import br.com.objectos.testable.NotTestable;

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

/**
 * @author [email protected] (Marcio Endo)
 */
class SimpleTestable implements IsTestable {

  final Naming naming;
  final TypeName testableOf;

  public SimpleTestable(Naming naming, TypeName testableOf) {
    this.naming = naming;
    this.testableOf = testableOf;
  }

  @Override
  public final Optional get(List propertyList) {
    List header = header();
    List body = body(propertyList);
    return body.isEmpty()
        ? Optional. empty()
        : Optional.of(isEqual(header, body));
  }

  List header() {
    return Collections.emptyList();
  }

  List body(List propertyList) {
    return propertyList.stream()
        .filter(property -> !property.hasAnnotation(NotTestable.class))
        .map(property -> CodeBlock.builder()
            .add("    .equal($L, that.$L())\n", property.name(), property.accessorName())
            .build())
        .collect(Collectors.toList());
  }

  String parameterName() {
    return "that";
  }

  private MethodSpec isEqual(List header, List body) {
    MethodSpec.Builder b = MethodSpec.methodBuilder("isEqual")
        .addModifiers(Modifier.PUBLIC)
        .addAnnotation(Override.class)
        .returns(boolean.class)
        .addParameter(parameterSpec());

    for (CodeBlock code : header) {
      b.addCode(code);
    }

    b.addCode("return $T.isEqualHelper()\n", testablesClass());
    for (CodeBlock code : body) {
      b.addCode(code);
    }
    b.addStatement("    .result()");

    return b.build();
  }

  Class testablesClass() {
    return Testables.class;
  }

  private ParameterSpec parameterSpec() {
    return ParameterSpec.builder(testableOf, parameterName()).build();
  }

}