/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.myfaces.tobago.util;

import org.apache.myfaces.tobago.renderkit.LabelWithAccessKey;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.StringTokenizer;

public class StringUtils {

  private StringUtils() {
  }

  /**
   * @deprecated Use commons-lang StringUtils.capitalize() instead.
   */
  @Deprecated
  public static String firstToUpperCase(String string) {
    if (Deprecation.LOG.isWarnEnabled()) {
      Deprecation.LOG.warn("use commons-lang please");
    }
    if (string == null) {
      return null;
    }
    switch (string.length()) {
      case 0:
        return string;
      case 1:
        return string.toUpperCase(Locale.ENGLISH);
      default:
        return string.substring(0, 1).toUpperCase(Locale.ENGLISH) + string.substring(1);
    }
  }

  public static List<Integer> parseIntegerList(String integerList)
      throws NumberFormatException {
    List<Integer> list = new ArrayList<Integer>();

    StringTokenizer tokenizer = new StringTokenizer(integerList, ", ");
    while (tokenizer.hasMoreElements()) {
      String token = tokenizer.nextToken().trim();
      if (token.length() > 0) {
        list.add(new Integer(token));
      }
    }

    return list;
  }

  public static <T> String toString(List<T> list) {
    StringBuilder buffer = new StringBuilder(",");
    for (T t : list) {
      buffer.append(t);
      buffer.append(",");
    }
    return buffer.toString();
  }

  @Deprecated
  public static String escapeAccessKeyIndicator(String label) {
    if (Deprecation.LOG.isWarnEnabled()) {
      Deprecation.LOG.warn(label);
    }
    return org.apache.commons.lang.StringUtils.replace(label,
        String.valueOf(LabelWithAccessKey.INDICATOR), LabelWithAccessKey.ESCAPED_INDICATOR);
  }

  /**
   * Checks if the String starts like a url, e.g. http: or xyz:
   */
  public static boolean isUrl(final String link) {
    if (link == null) {
      return false;
    }
    int colon = link.indexOf(':');
    if (colon < 1) {
      return false;
    }
    for (int i = 0; i < colon; i++) {
      if (!Character.isLetter(link.charAt(i))) {
        return false;
      }
    }
    return true;
  }
}
