package dk.thoerup.traininfoservice;

import java.util.Date;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.commons.lang.time.DurationFormatUtils;

public class Statistics {
	
	private AtomicInteger stationLookupsLocation = new AtomicInteger(0);
	private AtomicInteger stationLookupsName = new AtomicInteger(0);
	private AtomicInteger stationLookupsFavorites = new AtomicInteger(0);
	private AtomicInteger departureLookups = new AtomicInteger(0);
	private AtomicInteger timetableLookups = new AtomicInteger(0);
	private AtomicInteger departureCacheHits = new AtomicInteger(0);
	private AtomicInteger timetableCacheHits = new AtomicInteger(0);
	
	private Date lastReset = new Date();
	
	public void incrementStationLookupsLocation() {
		stationLookupsLocation.incrementAndGet();
	}
	
	public void incrementStationLookupsName() {
		stationLookupsName.incrementAndGet();
	}
	
	public void incrementStationLookupsFavorites() {
		stationLookupsFavorites.incrementAndGet();
	}
	
	public void incrementDepartureLookups() {
		departureLookups.incrementAndGet();
	}
	
	public void incrementTimetableLookups() {
		timetableLookups.incrementAndGet();
	}
	
	public void incrementDepartureCacheHits() {
		departureCacheHits.incrementAndGet();
	}
	
	public void incrementTimetableCacheHits() {
		timetableCacheHits.incrementAndGet();
	}
	
	/////////
	
	public int getStationTotals() {
		return stationLookupsLocation.get() + stationLookupsName.get() + stationLookupsFavorites.get();
	}
	
	public int getStationLookupsLocation() {
		return stationLookupsLocation.get();
	}
	
	public int getStationLookupsName() {
		return stationLookupsName.get();
	}
	
	public int getStationLookupsFavorites() {
		return stationLookupsFavorites.get();
	}
	
	public int getDepartureLookups() {
		return departureLookups.get();
	}
	
	public int getTimetableLookups() {
		return timetableLookups.get();
	}
	
	public int getDepartureCacheHits() {
		return departureCacheHits.get();
	}
	
	public int getTimetableCacheHits() {
		return timetableCacheHits.get();
	}
	
	public Date getLastReset() {
		return lastReset;
	}
	
	
	/* helper functions */
	
	public String getElapsedAsString() {
		Date now = new Date();		
		long duration = (now.getTime() - lastReset.getTime() );
		
		return DurationFormatUtils.formatDuration(duration, "d, HH:mm:ss"); 
	}
	
	public double getElapsedDays() {
		Date now = new Date();		
		long elapsedMs = now.getTime() - lastReset.getTime();
		long elapsedHour = elapsedMs / (60*60*1000);
		
		double elapsedDay = ((double)elapsedHour) / 24.0;
		
		if (elapsedDay < 1.0)
			elapsedDay  = 1.0;
		
		return elapsedDay;
	}
	
	
	/****
	 * Singleton stuff
	 */
	
	private static Statistics instance = null;
	private Statistics() {
		// Exists only to defeat instantiation.
	}
	public static Statistics getInstance() {
		if(instance == null) {
			instance = new Statistics();
		}
		return instance;
	}
}