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/*
 * Copyright (c) 2009 Piotr Piastucki
 * 
 * This file is part of Patchca CAPTCHA library.
 * 
 *  Patchca is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  Patchca is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with Patchca. If not, see .
 */
package cn.dreampie.captcha.word;

import java.util.Random;

public class RandomWordFactory implements WordFactory {

  protected String characters;
  protected int minLength;
  protected int maxLength;

  public RandomWordFactory() {
    this("ABCDEFGHIJKLMNPQRSTUVWXYZ123456789", 4);
  }

  public RandomWordFactory(String characters, int length) {
    this(characters, length, length);
  }

  public RandomWordFactory(String characters, int minLength, int maxLength) {
    this.characters = characters;
    this.minLength = minLength;
    this.maxLength = maxLength;
  }

  public void setCharacters(String characters) {
    this.characters = characters;
  }

  public void setMinLength(int minLength) {
    this.minLength = minLength;
  }

  public void setMaxLength(int maxLength) {
    this.maxLength = maxLength;
  }

  public String getNextWord() {
    Random rnd = new Random();
    StringBuffer sb = new StringBuffer();
    int l = minLength + (maxLength > minLength ? rnd.nextInt(maxLength - minLength) : 0);
    for (int i = 0; i < l; i++) {
      int j = rnd.nextInt(characters.length());
      sb.append(characters.charAt(j));
    }
    return sb.toString();
  }


}