package dk.thoerup.traininfo.provider;

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.util.Log;
import dk.thoerup.traininfo.TimetableBean;
import dk.thoerup.traininfo.util.AndroidTimeoutCache;
import dk.thoerup.traininfo.util.DownloadUtil;
import dk.thoerup.traininfo.util.XmlUtil;

public class XmlTimetableProvider implements TimetableProvider {
	
	final static int CACHE_TIMEOUT = 60*1000;

	AndroidTimeoutCache<String,List<TimetableBean>> departureCache = new AndroidTimeoutCache<String,List<TimetableBean>>(CACHE_TIMEOUT);	

	@Override
	public List<TimetableBean> lookupTimetable(String type, String trainID) {
		
		String trainNumber = extractTrainNumber(trainID);
		
		String key = type + "-" + trainID;
		List<TimetableBean> timetables = departureCache.get(key);
	
		if (timetables == null) {			
			timetables = lookupTimetableWorker(type, trainNumber);
			
			if (timetables != null) {			
				departureCache.put(key, timetables);
			}
			
		} else {
			Log.i("XmlTimetableProvider", "cache hit !!!");
		}		
		
		return timetables;
	}
	

	public List<TimetableBean> lookupTimetableWorker(String type, String trainNumber) {

		String url = XmlUtil.SERVICE_BASE + "/TimetableServlet?train=" + trainNumber + "&type=" + type;
		Log.i("url", url);
		try {
			List<TimetableBean> timetables = new ArrayList<TimetableBean>();
			
			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 entryNode = stationList.item(i);
				
				if (! entryNode.getNodeName().equals("entry"))
					continue;
	
				TimetableBean timetable = new TimetableBean();
				
				NodeList entries = entryNode.getChildNodes();				
				
				if (entryNode.hasAttributes() && entryNode.getAttributes().getNamedItem("current") != null) {					
					timetable.setCurrent( Boolean.parseBoolean(entryNode.getAttributes().getNamedItem("current").getNodeValue()));
				} else {
					timetable.setCurrent(false);
				}
				
				for (int j=0; j<entries.getLength(); j++) {	
					Node current = entries.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("station"))
						timetable.setStation( content );						
					
					if (nodeName.equals("arrival"))
						timetable.setArrival( content );
					
					if (nodeName.equals("departure"))
						timetable.setDeparture( content );
					
					if (nodeName.equals("stationid"))
						timetable.setStationId( Integer.parseInt(content));
					
					/*if (nodeName.equals("current"))
						timetable.setCurrent( Boolean.parseBoolean(content) );*/

				}
				timetables.add(timetable);				
			}
			return timetables;
			
			
		} catch (Exception e) {
			Log.e("XmlStationProvider", "lookupStations: ", e);
		}

		return null;
	}
	
	private String extractTrainNumber (String trainID) {

		String parts[]  = trainID.split(" ");
		if (parts.length == 2) {
			return parts[1];
		} else {
			return parts[0];
		}
	}

}