package dk.thoerup.traininfoservice;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RequestPlotter extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	static final Logger log = Logger.getLogger(RequestPlotter.class.getName());
	
	static final String KML = "application/vnd.google-earth.kml";
	static final String KMZ = "application/vnd.google-earth.kmz";
	
	protected String getKml() {
		StringBuilder sb = new StringBuilder();
		try {
			FileInputStream fis = new FileInputStream("/var/log/apache2/app_access.log");
			BufferedReader in = new BufferedReader( new InputStreamReader(fis) );
			
		
			sb.append( "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" );
			sb.append( "<kml xmlns=\"http://www.opengis.net/kml/2.2\">\n" );
			sb.append( "<Document>\n" );
			
			String line;
			while ( (line=in.readLine()) != null) {
				if (line.indexOf("LocateStation") == -1 ){
					continue;
				}
				
				if (line.indexOf("latitude") == -1 ) {
					continue;
				}
				
				String toks[] = line.split(" ");
				String ip = toks[0];
				String time = toks[3].replace("[", "");
				String argpart = toks[6].split("\\?")[1];

				
				String args[] = argpart.split("&");
				
				String lat = args[0].split("=")[1];
				String lng = args[1].split("=")[1];
				
		        sb.append( " <Placemark>\n" );
		        sb.append( "  <description>IP=" + ip + "  Time=" + time + "</description>\n" );
		        sb.append( "  <Point><coordinates>" + lng + "," + lat + ",0</coordinates></Point>\n" );
		        sb.append( " </Placemark>\n" );
				
			}
			
			sb.append(  "</Document>\n" );
			sb.append( "</kml>\n" );
			
		} catch (Exception e) {
			sb.append("<!-- error -->");
			log.log(Level.SEVERE, "getKml()", e);
		}
		
		return sb.toString();
	}

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		String data = getKml();
		
		if (req.getParameter("zip") != null) {
			
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			
			ZipOutputStream zip = new ZipOutputStream(baos);
			zip.putNextEntry( new ZipEntry("trains.kml") );
			zip.write( data.getBytes() );
			zip.closeEntry();
			zip.close();
						
			byte bytes[] = baos.toByteArray();
			
			resp.setContentType(KMZ);
			resp.setContentLength( bytes.length );
			resp.getOutputStream().write(bytes);
			
		} else {
			resp.setContentType(KML);
			resp.getWriter().print( getKml() );
		}
	}
	
	

}