package org.herac.tuxguitar.community.io;

import java.io.InputStream;
import java.net.URLDecoder;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class TGShareSongResponse {

  private static final String ATTRIBUTE_CODE = "code";
  private static final String ATTRIBUTE_VALUE = "value";
  private static final String TAG_MESSAGE = "message";
  private static final String TAG_MESSAGES = "messages";
  private static final String TAG_STATUS = "status";

  private Document document;

  public TGShareSongResponse(InputStream stream) throws Throwable {
    this.initialize(stream);
  }

  private String getAttributeValue(NamedNodeMap node, String attribute) {
    try {
      if (node != null && attribute != null) {
        Node namedItem = node.getNamedItem(attribute);
        if (namedItem != null) {
          return URLDecoder.decode(namedItem.getNodeValue(), "UTF-8");
        }
      }
    } catch (Throwable throwable) {
      LOG.error(throwable);
    }
    return null;
  }
  /** The Logger for this class. */
  public static final transient Logger LOG = Logger.getLogger(TGShareSongResponse.class);


  public String getStatus() throws Throwable {
    if (this.document != null) {
      return getStatus(this.document.getFirstChild());
    }
    return null;
  }

  private String getStatus(Node rootNode) throws Throwable {
    NodeList rootNodes = rootNode.getChildNodes();
    for (int i = 0; i < rootNodes.getLength(); i++) {
      Node statusNode = rootNodes.item(i);
      if (statusNode.getNodeName().equals(TAG_STATUS)) {
        return getAttributeValue(statusNode.getAttributes(), ATTRIBUTE_CODE);
      }
    }
    return null;
  }

  private void initialize(InputStream stream) throws Throwable {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    this.document = builder.parse(stream);
  }

  public String loadMessages(List<String> list) throws Throwable {
    if (this.document != null) {
      return loadMessages(list, this.document.getFirstChild());
    }
    return null;
  }

  private String loadMessages(List<String> list, Node rootNode) throws Throwable {
    NodeList rootNodes = rootNode.getChildNodes();
    for (int i = 0; i < rootNodes.getLength(); i++) {
      Node messagesNode = rootNodes.item(i);
      if (messagesNode.getNodeName().equals(TAG_MESSAGES)) {
        NodeList messageList = messagesNode.getChildNodes();
        for (int e = 0; e < messageList.getLength(); e++) {
          Node messageNode = messageList.item(e);
          if (messageNode.getNodeName().equals(TAG_MESSAGE)) {
            list.add(getAttributeValue(messageNode.getAttributes(),
                ATTRIBUTE_VALUE));
          }
        }
      }
    }
    return null;
  }
}