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/*
 * Copyright 2016 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.flat;

import java.io.IOException;
import java.time.LocalDateTime;
import java.util.Optional;

/**
 * @author [email protected] (Marcio Endo)
 */
abstract class LocalDateTimeField extends Field {

  private LocalDateTimeField() {
  }

  public static LocalDateTimeField get(LocalDateTime dateTime, LocalDateTimePattern pattern) {
    return new Present(dateTime, pattern);
  }

  public static LocalDateTimeField get(
      Optional maybe, LocalDateTimePattern pattern, String defaultValue) {
    return maybe.isPresent()
        ? new Present(maybe.get(), pattern)
        : new Absent(defaultValue);
  }

  private static class Absent extends LocalDateTimeField {

    private final String value;

    private Absent(String value) {
      this.value = value;
    }

    @Override
    void tryToWriteTo(ApiFlatAppendable out) throws IOException {
      out.append(value);
    }

  }

  private static class Present extends LocalDateTimeField {

    private final LocalDateTime dateTime;
    private final LocalDateTimePattern pattern;

    private Present(LocalDateTime dateTime, LocalDateTimePattern pattern) {
      this.dateTime = dateTime;
      this.pattern = pattern;
    }

    @Override
    void tryToWriteTo(ApiFlatAppendable out) throws IOException {
      out.append(pattern.toString(dateTime));
    }

  }

}