package dk.thoerup.traininfo.provider;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

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

import android.content.Context;
import android.location.Location;
import android.util.Log;
import dk.thoerup.android.traininfo.common.StationBean;
import dk.thoerup.android.traininfo.common.StationEntry;
import dk.thoerup.genericjavautils.HttpUtil;
import dk.thoerup.traininfo.util.IntSet;
import dk.thoerup.traininfo.util.XmlUtil;

public class OfflineStationProvider implements StationProvider {
	
	StationBean stations = new StationBean();


	public boolean loadStations(Context context) throws Exception {
		File parent = context.getFilesDir();
		File stationsFile = new File(parent, "stations.xml");
		
		if (!stationsFile.exists())
			return false;
		
		int size = (int) stationsFile.length();
		byte data[] = new byte[size];
		
		RandomAccessFile raf = new RandomAccessFile(stationsFile, "r");
		raf.readFully(data);
		
		Serializer serializer = new Persister();
		stations = serializer.read(StationBean.class,  new String(data, "ISO-8859-1") );
		
		Log.e("OFFLINE", "loaded" + stations.entries.size());
		
		return true;
	}	
	
	public void downloadStations(Context context) throws IOException {
		File parent = context.getFilesDir();
		File stationsFile = new File(parent, "stations.xml");

		byte data[] = HttpUtil.getContent(XmlUtil.SERVICE_BASE + "/LocateStations?dump=1", 5000);
		
		RandomAccessFile raf = new RandomAccessFile(stationsFile, "rw");
		Log.e("OFFLINE", "data size" + data.length);
		raf.setLength(0); //truncate
		raf.write(data);
		raf.close();				
	}
	
	

	@Override
	public void purgeOldEntries() {
	}

	
	@Override
	public StationBean lookupStationsByLocation(Location location) {
		
		Location tmpLoc = new Location("GPS");
		
		ArrayList<StationEntry> entries = new ArrayList<StationEntry>() ;
		
		for (StationEntry entry : stations.entries) {
			tmpLoc.setLatitude(entry.getLatitude());
			tmpLoc.setLongitude(entry.getLongitude());
			
			entry.setCalcdist( (int) location.distanceTo(tmpLoc) ); 
			entries.add(entry);
			
		}
		
		Collections.sort( entries, new Comparator<StationEntry>() {
			@Override
			public int compare(StationEntry object1, StationEntry object2) {
				if (object1.getCalcdist() == object2.getCalcdist()) 					
					return 0;
				
				if (object1.getCalcdist() > object2.getCalcdist())
					return 1;
				else
					return -1;
			}
			
		});
		
		
		
		StationBean tmpStations = new StationBean();
		for (int i = 0; i<8; i++) {
			tmpStations.entries.add( entries.get(i) );
		}
		
		return tmpStations;
	}

	@Override
	public StationBean lookupStationsByName(String name) {
		
		name = name.toLowerCase();
		StationBean tmpStations = new StationBean();
		for (StationEntry entry : stations.entries) {
			if (entry.getName().toLowerCase().startsWith(name) ) {
				tmpStations.entries.add(entry);
			}
		}
						
		return tmpStations;
	}

	@Override
	public StationBean lookupStationsByIds(String ids) {
		IntSet idset = new IntSet();
		idset.fromString(ids);
		
		StationBean tmpStations = new StationBean();
		for (StationEntry entry : stations.entries) {
			if (idset.contains( entry.getId() ) ) {
				tmpStations.entries.add(entry);
			}
		}
		
		
		
		return tmpStations;
	}

}