package dk.thoerup.traininfo.provider;


import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import android.location.Location;
import android.util.Log;
import dk.thoerup.traininfo.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, List<StationBean>> stationCache = new AndroidTimeoutCache<String, List<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 List<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 List<StationBean> lookupStationsByName(String name) {		
		
	//	String url = XmlUtil.SERVICE_BASE + "/LocateStations?name=" + Uri.encode(name);
		String url = "";
		
		try {
			url = XmlUtil.SERVICE_BASE + "/LocateStations?name=" + URLEncoder.encode(name, "ISO8859-1");	
		} catch (Exception e) {
			Log.e("lookupStations", "Encoding failed", e);
		}
		
		Log.i("url", url);
		return lookupStationsWorker(url);
	}
	
	
	@Override
	public List<StationBean> lookupStationsByIds(String ids) {
		String url = "";
		url = XmlUtil.SERVICE_BASE + "/LocateStations?list=" + ids;
		
		Log.i("url", url);
		return lookupStationsWorker(url);
	}
	
	public List<StationBean> lookupStationsWorker(String url) {
		
		List<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 List<StationBean> fetchStations(String url) {

		try {
			List<StationBean> stations = new ArrayList<StationBean>();
			
			String xml = DownloadUtil.getContentString(url, 15000, "ISO-8859-1");
			
			
			Document doc = XmlUtil.parseXML(xml);
			Node rootNode = doc.getDocumentElement(); // stations
			NodeList stationList = rootNode.getChildNodes();
			

			for (int i=0; i<stationList.getLength(); i++) {
				Node stationNode = stationList.item(i);
				
				if (! stationNode.getNodeName().equals("station"))
					continue;
	
				StationBean station = new StationBean();
				
				NodeList stationElements = stationNode.getChildNodes();
				for (int j=0; j<stationElements.getLength(); j++) {	
					Node current = stationElements.item(j);
										
					String content = null;
					if (current.getFirstChild() != null) 
						content = current.getFirstChild().getNodeValue(); //get the textNode - then get the text node's value
					
					String nodeName = current.getNodeName();
					
					if (nodeName.equals("id"))
						station.setId( Integer.parseInt(content));
					
					if (nodeName.equals("name"))
						station.setName(content);
					
					if (nodeName.equals("latitude"))
						station.setLatitude( Double.parseDouble(content) );
					
					if (nodeName.equals("longitude"))
						station.setLongitude( Double.parseDouble(content) );
					
					if (nodeName.equals("calcdist"))
						station.setDistance( (int) Double.parseDouble(content) );
					
					if (nodeName.equals("address"))
						station.setAddress( content );
					
					if (nodeName.equals("regional"))
						station.setRegional( Boolean.parseBoolean(content) );
					
					if (nodeName.equals("strain"))
						station.setSTrain( Boolean.parseBoolean(content) );
					
					if (nodeName.equals("metro"))
						station.setMetro( Boolean.parseBoolean(content) );

				}
				stations.add(station);				
			}
			return stations;
			
			
		} catch (Exception e) {
			Log.e("XmlStationProvider", "lookupStations: ", e);
			return null;
		}
	}
}