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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.flat;

import java.util.Objects;

/**
 * @author [email protected] (Marcio Endo)
 */
class DecimalColumn extends Column {

  private final int scale;

  private DecimalColumn(int index, int precision, int scale) {
    super(index, precision);
    this.scale = scale;
  }

  public static DecimalColumn get(int precision, int scale) {
    int index = 0;
    return get(index, precision, scale);
  }

  public static DecimalColumn get(int index, int precision, int scale) {
    return new DecimalColumn(index, precision, scale);
  }

  public static DecimalColumn get(int precision, int scale, DoubleValueCondition condition, String text) {
    int index = 0;
    return get(index, precision, scale, condition, text);
  }

  public static DecimalColumn get(int index, int precision, int scale, DoubleValueCondition condition, String text) {
    return new Conditional(index, precision, scale, condition, text);
  }

  @Override
  Token parse(Line line, String text) {
    try {
      int intValue = Integer.parseInt(text.trim());
      double value = intValue / Math.pow(10, scale);
      return new DoubleValue(this, text, value);
    } catch (NumberFormatException e) {
      return ColumnParseError.exception(this, line, text, e);
    }
  }

  private static class Conditional extends DecimalColumn {

    private final DoubleValueCondition condition;
    private final String text;

    public Conditional(int index, int precision, int scale, DoubleValueCondition condition, String text) {
      super(index, precision, scale);
      this.condition = condition;
      this.text = text;
    }

    @Override
    Token parse(Line line, String text) {
      return Objects.equals(text, this.text)
          ? condition.token(this, text)
          : super.parse(line, text);
    }

  }

}