package org.herac.tuxguitar.gui.tools.browser.xml;

import java.io.File;
import java.io.IOException;

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

import org.apache.log4j.Logger;
import org.herac.tuxguitar.gui.editors.chord.ChordSelector;
import org.herac.tuxguitar.gui.tools.browser.TGBrowserCollectionInfo;
import org.herac.tuxguitar.gui.tools.browser.TGBrowserManager;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class TGBrowserReader {
  private static final String ATTRIBUTE_DATA = "data";
  private static final String ATTRIBUTE_TYPE = "type";
  private static final String ITEM_TAG = "browser-collection";

  /** The Logger for this class. */
  public static final transient Logger LOG = Logger
      .getLogger(TGBrowserReader.class);
  
  private static Document getDocument(File file)
      throws ParserConfigurationException, SAXException, IOException {
    Document document = null;
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

    DocumentBuilder builder = factory.newDocumentBuilder();
    document = builder.parse(file);

    return document;
  }

  private static void loadCollections(TGBrowserManager manager, Node node) {
    NodeList listNode = node.getChildNodes();
    for (int i = 0; i < listNode.getLength(); i++) {
      Node child = listNode.item(i);
      String nameNode = child.getNodeName();
      if (nameNode.equals(ITEM_TAG)) {
        NamedNodeMap params = child.getAttributes();

        String type = params.getNamedItem(ATTRIBUTE_TYPE).getNodeValue();
        String data = params.getNamedItem(ATTRIBUTE_DATA).getNodeValue();
        if (type != null) {
          TGBrowserCollectionInfo info = new TGBrowserCollectionInfo();
          info.setType(type);
          info.setData(data);
          manager.addInfo(info);
        }
      }
    }
  }

  public void loadCollections(TGBrowserManager manager, File file) {
    if (file.exists()) {
      try {
        Document doc = getDocument(file);
        loadCollections(manager, doc.getFirstChild());
      } catch (Throwable throwable) {
        LOG.error(throwable);
      }
    }
  }

}