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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.testable;

import java.util.Objects;

import com.google.common.base.Optional;

/**
 * @author [email protected] (Marcio Endo)
 */
class GuavaOptionalEquality implements Equality {

  private final String name;
  private final Equality result;

  private GuavaOptionalEquality(String name, Equality result) {
    this.name = name;
    this.result = result;
  }

  public static Equality of(String name, Optional a, Optional b) {
    if (a == b) {
      return Equality.equal();
    }

    if (b == null) {
      return new GuavaOptionalEquality(name, Equality.nullValue());
    }

    Object maybeA = a.orNull();
    Object maybeB = b.orNull();

    Equality result = maybeA instanceof Testable
        ? ((Testable) maybeA).isEqualTo(maybeB)
        : Objects.equals(maybeA, maybeB)
            ? Equality.equal()
            : Equality.fail(Objects.toString(maybeA), Objects.toString(maybeB));
    return new GuavaOptionalEquality(name, result);
  }

  @Override
  public boolean isEqual() {
    return result.isEqual();
  }

  @Override
  public void accept(Reporter reporter) {
    if (!result.isEqual()) {
      reporter.name(name);
      reporter.indent();
      result.accept(reporter);
      reporter.unindent();
    }
  }

}