package dk.thoerup.traininfo.provider;

import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

import android.util.Log;
import dk.thoerup.android.traininfo.common.MetroBean;
import dk.thoerup.traininfo.util.AndroidTimeoutCache;
import dk.thoerup.traininfo.util.DownloadUtil;
import dk.thoerup.traininfo.util.XmlUtil;

public class XmlMetroProvider implements MetroProvider {
	
	final int CACHE_TIMEOUT = 60000;

	AndroidTimeoutCache<Integer,MetroBean> metroCache = new AndroidTimeoutCache<Integer,MetroBean>(CACHE_TIMEOUT);
	

	@Override
	public MetroBean lookupMetroInfo(int stationID) {
		
		MetroBean metro = metroCache.get(stationID);
	
		if (metro == null) {			
			metro = lookupMetroWorker(stationID);
			
			if (metro != null) {			
				metroCache.put(stationID, metro);
			}
			
		} else {
			Log.i("XmlDepartureProvider", "cache hit !!!");
		}		
		
		return metro;
	}
	
	
	private MetroBean lookupMetroWorker(int stationID) {

		try
		{	
			String url = XmlUtil.SERVICE_BASE + "/MetroServlet?station=" + stationID;
			Log.i("xmlurl",url);
			String doc =  DownloadUtil.getContentString(url, 15000, "ISO-8859-1");
			
			Serializer serializer = new Persister();

			MetroBean metro = serializer.read(MetroBean.class, doc);
			
			return metro;

						
		} catch (Exception e) {
			Log.e("XmlMetroProvider", "lookupFunction", e);
			return null;
		}		
	}
		
}