/*Kristina Laukkonen.
*Uppgift 1.2.1
*/
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class A121 extends HttpServlet {
  	
	int count = 0;
	
        File f = null;
	private static String htmlTemplate = null;	
       //Försöker ladda init räknare
	public void init() throws ServletException { 
	
		FileReader fileReader = null;
		BufferedReader bufferedReader = null;
		try {
			f = new File(getServletContext().getRealPath("Raknare.txt"));
			fileReader = new FileReader("f");
			bufferedReader = new BufferedReader(fileReader);
			String initial = bufferedReader.readLine();
			count = Integer.parseInt(initial);   //gör inital till en integer count
			return;
		}
		catch (FileNotFoundException ignored) { } //inget sparat
		catch (IOException ignored) { }		  //tar problem under läsning
		catch (NumberFormatException ignored) { } //tar övriga värden
		finally {
			try {
				if (bufferedReader != null) {
				bufferedReader.close();
				}
			}
	
			catch (IOException ignored) {}
		}
	
               //Tillståndet lyckades inte laddas, kollar efter parameter
		String initial = getInitParameter("initial");
		try {
			count = Integer.parseInt(initial);
			return;
		}
		catch (NumberFormatException ignored) {}	
			//sätter count till värdet 0 som default
                    count = 0;				

		if (htmlTemplate == null) {
   			htmlTemplate = Mixer.getContent(new File(getServletContext().getRealPath("rakna.html")));
		} 

 
	}
        //Skriver ut värdet på count i "text/html" med hjälp av en PrintWriter. Count ökas med 1 varje 
	public void doGet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { 
	
		res.setContentType("text/html");
		PrintWriter out = res.getWriter();
		synchronized(this) {
			count++;
			if (count % 10 == 0) saveState();
 			Mixer m = new Mixer(htmlTemplate);
			m.add("---hits---", ""+ count);
			
			res.setContentType("text/html");
			PrintWriter pw = res.getWriter();
			pw.println(m.getMix()); 


		}
	}
	public void destroy() { 	//rensar upp resurer 
		saveState();
	}

	public void saveState() { 	
		                //Sparar det värdet i raknare.txt 
                FileWriter fileWriter= null;
		PrintWriter printWriter= null;
		
                try {
			fileWriter = new FileWriter("Raknare.txt");
			printWriter = new PrintWriter(fileWriter);
			printWriter.println(count);
			return;
		}
		
                catch (IOException e) {			//problem under skrivning
		}
		    
		//Stänger PrintWriter 
                finally {
		if(printWriter != null) {	
                        printWriter.close();
			}
		}
	}
}