import krister.Ess.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;

class SoundBox
{
  String podcast_url;  
  AudioStream audio_stream = null;
  AudioFile audio_file = null;
  String audio_stream_url = "";
  
  SoundBox(String podcast_url)
  {
    this.podcast_url = podcast_url;    
    if (!podcast_url.equals(""))
    {
      playRandomSong();    
    }
  }
  
  void playRandomSong()
  {
    if (audio_file != null)
    {
       audio_file.close();
       audio_stream.stop();
    }
    
    audio_stream_url = getRandomSongURL();
    if (audio_stream_url.equals(""))
    {
      return;
    }
    audio_file = new AudioFile(audio_stream_url, 0, Ess.READ);

    // create a new AudioStream and set the sample rate
    audio_stream = new AudioStream(32*1024); // 32k samples
    audio_stream.sampleRate(audio_file.sampleRate);

    audio_stream.start();
    println(audio_stream_url);
  }
  
  String getRandomSongURL()
  {
    URL url = null;
    try
    {  
      url = new URL(podcast_url);
    }
    catch(Exception e)
    {
      println(e);
      return "";
    }
    
    InputStream is = null;
    try
    {
      is = url.openStream();
    }
    catch(Exception e)
    {
      println(e);
      return "";
    }
    
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = null;
    try
    {
     db = dbf.newDocumentBuilder();
    }
    catch(Exception e)
    {
      println(e);
      return "";
    }
    Document d = null;
    try
    {
      d = db.parse(is);
    }
    catch(Exception e)
    {
      println(e);
      return "";
    }
    
    NodeList songs = d.getElementsByTagName("item");
    Node song = songs.item((int)random(songs.getLength()));
    NodeList song_info = song.getChildNodes();
    Node song_i;
    for(int i = 0; i < song_info.getLength(); i++)
    {
      song_i = song_info.item(i);
      if (song_i.getNodeName().equals("link"))
      {
        Node song_link = (song_i.getChildNodes()).item(0);
        return song_link.getNodeValue();        
      }
    }
    return "";    
  }
  
  boolean isActive()
  {
    return (podcast_url != null && !podcast_url.equals("") && audio_stream_url != null && !audio_stream_url.equals("") && audio_file != null);
  }  
}