package dk.thoerup.traininfoservice.banedk;


import java.net.URL;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;


import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import dk.thoerup.circuitbreaker.CircuitBreaker;
import dk.thoerup.circuitbreaker.CircuitBreakerManager;
import dk.thoerup.traininfoservice.StationBean;
import dk.thoerup.traininfoservice.StationDAO;
import dk.thoerup.traininfoservice.Statistics;



public class MetroFetcher {
	public static class MetroEntry {
		String metro;
		String destination;
		String minutes;		
	}
	
	public static class MetroBean {
		String head;
		String operationInfo; //driftsinfo
		String plan; // koereplan
		
		List<MetroEntry> entries = new ArrayList<MetroEntry>();
	}
	
	Logger logger = Logger.getLogger(MetroFetcher.class.getName());
	StationDAO stationDAO = new StationDAO();
	
	Map<String, MetroBean> cache = new TimeoutMap<String,MetroBean>(1000);
	
	public MetroBean cachedLookupMetroDepartures(int stationID) throws Exception {
		final String key = "metro:" + stationID;
		
		MetroBean metroBean = cache.get(key);
		
		if (metroBean == null) {
			metroBean = lookupMetroDepartures(stationID);
			cache.put(key, metroBean);
		} else {
			Statistics.getInstance().incrementDepartureCacheHits();
			logger.info("Metro: Cache hit " + key); //remove before production
		}
		return metroBean;
	}

	public MetroBean lookupMetroDepartures(int stationID) throws Exception {
		
		StationBean station = stationDAO.getById(stationID) ;
			
		
		URL url = new URL("http://www.m.dk/layouts/Metro/Widgets/MetroWidget.ashx?StationId=" + station.getMetro() + "&Congestion=true&Application=MyMetro&Expiration=true");
		
	    JsoupInvocation wrapper = new JsoupInvocation( url, 3000);
	    CircuitBreaker breaker = CircuitBreakerManager.getManager().getCircuitBreaker("metro");
		
		Document doc = (Document) breaker.invoke(wrapper);
		
		MetroBean bean = new MetroBean();
		
		bean.head = doc.getElementsByClass("metro-widget-headline").get(0).text(); 			
		
		Element content = doc.getElementsByClass("metro-widget-content").get(0);
		Elements contentElems = content.children();
							
		Element departureTable = content.getElementsByTag("table").get(0);

		Elements rows = departureTable.getElementsByTag("tr");

		for (int i=1; i<rows.size(); i++) {
			Element row = rows.get(i);	
			Elements fields = row.children();
			
			String metro = fields.get(0).text();
			String destination = fields.get(1).text();
			Elements minuteFields = fields.get(2).children();
			String minutes ="";
			
			for (Element elm : minuteFields) {
				minutes = minutes + elm.text() + " ";
			}
			
			MetroEntry entry = new MetroEntry();
			entry.metro = metro;
			entry.destination = destination;
			entry.minutes = minutes;
			
			bean.entries.add(entry);			
		}
				
		bean.operationInfo = contentElems.get(3).text(); 		
		bean.plan = contentElems.get(5).text();
		
		return bean;
	}
	
}