/*
 * Copyright 2007, MetaDimensional Technologies Inc.
 *
 *
 * This file is part of the RememberTheMilk Java API.
 *
 * The RememberTheMilk Java API 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.
 *
 * The RememberTheMilk Java API 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.weloveastrid.rmilk.api.data;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 *
 * @author Will Ross Jun 21, 2007
 */
@SuppressWarnings("nls")
public abstract class RtmData
{

  private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");

  public RtmData() {
      //
  }

  /**
   * The method is not optimized at most, but circumvents a bug in Android runtime.
   */
  public static Element child(Element elt, String nodeName)
  {
    NodeList childNodes = elt.getChildNodes();
    for (int index = 0; index < childNodes.getLength(); index++)
    {
      Node child = childNodes.item(index);
      if (child.getNodeType() == Node.ELEMENT_NODE && child.getNodeName().equals(nodeName))
      {
        return (Element) child;
      }
    }
    return null;
  }

  /**
   * The method is not optimized at most, but circumvents a bug in Android runtime.
   */
  public static List<Element> children(Element elt, String nodeName)
  {
    List<Element> result = new ArrayList<Element>();
    NodeList childNodes = elt.getChildNodes();
    for (int index = 0; index < childNodes.getLength(); index++)
    {
      Node child = childNodes.item(index);
      if (child.getNodeType() == Node.ELEMENT_NODE && child.getNodeName().equals(nodeName))
      {
        result.add((Element) child);
      }
    }
    return result;
  }

  protected String text(Element elt)
  {
    StringBuilder result = new StringBuilder();
    Node child = elt.getFirstChild();
    while (child != null)
    {
      switch (child.getNodeType())
      {
      case Node.TEXT_NODE:
      case Node.CDATA_SECTION_NODE:
        result.append(child.getNodeValue());
        break;
      default:
        break;
      }
      child = child.getNextSibling();
    }
    return result.toString();
  }

  public synchronized static Date parseDate(String s)
  {
    try
    {
      Date d = DATE_FORMAT.parse(s);
      return new Date(d.getTime() + TimeZone.getDefault().getOffset(d.getTime()));
    }
    catch (ParseException e)
    {
      throw new RuntimeException(e);
    }
  }

  public synchronized static String formatDate(Date d)
  {
    return DATE_FORMAT.format(new Date(d.getTime() - TimeZone.getDefault().getOffset(d.getTime()))) + "Z";
  }
}