/*
 * 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.way.assertion;

import br.com.objectos.way.testable.Equality;
import br.com.objectos.way.testable.Testable;
import java.util.Objects;
import java.util.Optional;

/**
 * @author marcio.endo@objectos.com.br (Marcio Endo)
 */
public class OptionalAssertion<T> extends AbstractAssertion<OptionalAssertion<T>, Optional<T>> {

  OptionalAssertion(Optional<T> subject) {
    super(subject);
  }

  public OptionalAssertion<T> contains(T value) {
    if (subject().isPresent()) {
      T actual = subject().get();

      if (!Objects.equals(actual, value)) {
        fail("Value not equal", Objects.toString(value), Objects.toString(actual));
      }
    } else {
      fail("Optional is empty.");
    }
    return self();
  }

  public OptionalAssertion<T> isEmpty() {
    if (subject().isPresent()) {
      fail("Optional is not empty.");
    }
    return self();
  }

  public OptionalAssertion<T> isEmpty(boolean expected) {
    if (subject().isPresent() == expected) {
      fail("Optional is not empty.");
    }
    return self();
  }

  public OptionalAssertion<T> isEqualTo(T value) {
    if (subject().isPresent()) {
      T actual = subject().get();

      if (actual instanceof Testable) {
        Equality equality = ((Testable) actual).isEqualTo(value);
        testEquality(equality);
      } else {
        fail("Value is not an instance of Testable.");
      }
    }
    return self();
  }

  public OptionalAssertion<T> isPresent() {
    if (!subject().isPresent()) {
      fail("Optional is not present.");
    }
    return self();
  }

  public OptionalAssertion<T> isPresent(boolean expected) {
    if (subject().isPresent() != expected) {
      fail("Optional is not present.");
    }
    return self();
  }

  @Override
  protected OptionalAssertion<T> self() {
    return this;
  }

}