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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.io.flat;

import java.io.IOException;
import java.util.Set;

import br.com.objectos.io.flat.annotation.IntegerOption;

import com.google.common.collect.ImmutableSet;

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

  final int value;
  private final int length;
  private final Set optionSet;

  private IntegerField(int value, int length, Set optionSet) {
    this.value = value;
    this.length = length;
    this.optionSet = optionSet;
  }

  public static IntegerField get(int value, int length, IntegerOption... options) {
    Set optionSet = ImmutableSet.copyOf(options);
    return new IntegerField(value, length, optionSet);
  }

  public static IntegerField get(
      int value, int length, IntValueCondition condition, String text, IntegerOption... options) {
    Set optionSet = ImmutableSet.copyOf(options);
    return new Conditional(value, length, optionSet, condition, text);
  }

  @Override
  void tryToWriteTo(FlatAppendable out) throws IOException {
    StringBuilder format = new StringBuilder();
    format.append('%');
    for (IntegerOption option : optionSet) {
      option.formatString(format);
    }
    format.append(length);
    format.append('d');

    out.append(length, format.toString(), value);
  }

  private static class Conditional extends IntegerField {

    private final IntValueCondition condition;
    private final String text;

    public Conditional(int value,
                       int length,
                       Set optionSet,
                       IntValueCondition condition,
                       String text) {
      super(value, length, optionSet);
      this.condition = condition;
      this.text = text;
    }

    @Override
    void tryToWriteTo(FlatAppendable out) throws IOException {
      if (condition.matches(value)) {
        out.append(text);
      } else {
        super.tryToWriteTo(out);
      }
    }

  }

}