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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.args;

import java.util.stream.Stream;

/**
 * @author [email protected] (Marcio Endo)
 */
public abstract class Part {

  final Part next;

  private boolean visited = false;

  Part(Part next) {
    this.next = next;
  }

  static Stream parse(Box box, String value) {
    return Empty.of(box.next, value).upgradeIfPossible(box);
  }

  @Override
  public abstract String toString();

  abstract void acceptOptionMap(OptionMap.Builder optionMap);

  int intValue(int defaultValue) {
    return defaultValue;
  }

  boolean isArgument() {
    return false;
  }

  int parseInt(String text, int defaultValue) {
    try {
      return Integer.parseInt(text, 10);
    } catch (NumberFormatException e) {
      return defaultValue;
    }
  }

  boolean subCommand(String subCommand) {
    return false;
  }

  String textOrElse(String defaultValue) {
    return defaultValue;
  }

  Command toCommand() {
    return Command.empty();
  }

  abstract Stream upgradeIfPossible(Box box);

  boolean unvisited() {
    return !visited;
  }

  Part visited() {
    visited = true;
    return this;
  }

}