package dk.thoerup.traininfo.provider;


import java.net.URLEncoder;

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


import android.location.Location;
import android.util.Log;
import dk.thoerup.android.traininfo.common.StationBean;
import dk.thoerup.traininfo.util.AndroidTimeoutCache;
import dk.thoerup.traininfo.util.DownloadUtil;
import dk.thoerup.traininfo.util.XmlUtil;

public class XmlStationProvider implements StationProvider {
	
	final static int CACHE_TIMEOUT = 300*1000;

	//List<StationBean> stations = new ArrayList<StationBean>();	
	AndroidTimeoutCache<String, StationBean> stationCache = new AndroidTimeoutCache<String, StationBean>(CACHE_TIMEOUT);
	

	double roundToPlaces(double value, int places) {
		double pow = Math.pow(10, places);
		double temp = Math.round( value*pow );
		
		return temp / pow;
	}

	@Override
	public StationBean lookupStations(Location location) {
		double lat = roundToPlaces(location.getLatitude(), 4);
		double lng = roundToPlaces(location.getLongitude(), 4);
		
		String url = XmlUtil.SERVICE_BASE + "/LocateStations?latitude=" + lat + "&longitude=" + lng;
		Log.i("url", url);
		return lookupStationsWorker(url);
	}
	
	@Override
	public StationBean lookupStationsByName(String name) {		
		
		try {
			name = URLEncoder.encode(name, "ISO8859-1");	
		} catch (Exception e) {
			Log.e("lookupStations", "Encoding failed", e);//if encoding fails use original and hope for the best
		}
		
		String url = XmlUtil.SERVICE_BASE + "/LocateStations?name=" + name;
		
		
		Log.i("url", url);
		return lookupStationsWorker(url);
	}
	
	
	@Override
	public StationBean lookupStationsByIds(String ids) {
		String url = "";
		url = XmlUtil.SERVICE_BASE + "/LocateStations?list=" + ids;
		
		Log.i("url", url);
		return lookupStationsWorker(url);
	}
	
	public StationBean lookupStationsWorker(String url) {
		
		StationBean tmpStations = stationCache.get(url);
		
		if (tmpStations != null) {
			Log.i("lookupStations", "cache hit " + url);
		} else {
			tmpStations = fetchStations(url);
			
			if (tmpStations != null) {
				stationCache.put(url, tmpStations);
			}
		}
		
		return tmpStations;
	}


	public StationBean fetchStations(String url) {

		try {
			
			String xml = DownloadUtil.getContentString(url, 15000, "ISO-8859-1");
			
			Serializer serializer = new Persister();

			StationBean stations = serializer.read(StationBean.class, xml);
			
			return stations;
			
		} catch (Exception e) {
			Log.e("XmlStationProvider", "lookupStations: ", e);
			return null;
		}
	}
}