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import java.awt.image.BufferedImage;
import java.io.*;
import java.net.*;
import java.util.*;

import javax.imageio.ImageIO;

public class DummyHttpWorker implements Runnable {
  private Socket s;  // connection socket

  public DummyHttpWorker(Socket soc) {
    this.s = soc;

  }

  public void inviaRisposta(PrintWriter out)
  {
    out.println("HTTP/1.0 404 NOT FOUND");
    out.println("Server: Pippo");
    out.println("Date: "+ (new Date().toString()));
    out.println("Content-type: text/html");
    //out.println("Content-length: 0");
    out.println();  // blank line before message body..
    out.println("<!DOCTYPE HTML PUBLIC '-//IETF//DTD HTML 2.0//EN'>");
    out.println("<html><head><title>404 Not Found</title></head><body>");
    out.println("<h1>Pippo server says: Not Found!</h1>");
    out.println("<p>The requested URL was not found on this server.</p>");
    out.println("<hr></body></html>");
  }


  public void run()
  {
    PrintWriter out;
    BufferedReader in;
    System.out.println ("Connection successful! Waiting for input..");
    try    {
      out = new PrintWriter(s.getOutputStream(),true);
      // PrintWriter permette di stampare su un output stream
      in = new BufferedReader(new InputStreamReader(s.getInputStream()));
      // BufferedReader legge testo da input stream e permette di effettuare operazioni di lettura caratteri e righe
      String inputLine, method = null, res = null;

      while ((inputLine = in.readLine()) != null)
      {
        System.out.println ("Received "+inputLine.length()+" chars: " + inputLine);
        // Check if there's a blank line: new line or carriage return as first char
        String[] data = inputLine.split(" ");

        //Nel caso la richiesta sia GET
        if(data[0].equals("GET")) {
        	method  = "GET";
        	res = data[1];
        }
        if(inputLine.length() == 0) {
    		out.println("HTTP/1.0 200 OK");
            out.println("Server: GX8Server");
            out.println("Date: "+ (new Date().toString()));

            //Se richiede / restituisco l'index
        	if(res.equals("/"))
        		sendRes("index.html", out);
        	else{
        		//Apro il file
        		File f = new File(res.substring(1));
        		String filename = f.getName();

        		//Controllo che il file esista
        		if(f.exists() && !f.isDirectory()) {

        			//Controllo se è un'immagine
        		    if(isImage(res)) {
        		    	//Mando l'header per specificare che è un'immagine e il tipo
        		    	out.println("Content-type: image/"+filename.substring(filename.lastIndexOf(".")+1));
        		    	out.println();

        		    	OutputStream os = s.getOutputStream();
        		    	sendImage(f,os); //Metodo per mandare immagini, vedi sotto
        		    }
        		    if(f.getName().endsWith(".html") || f.getName().endsWith(".txt")) //Controllo se è un file html o txt
        		    	sendRes(filename, out); //Metodo per mandare file txt/html, vedi sotto
        		}
        	}
          break;
        }
      }
      System.out.println("Closing connection..");
      out.close();
      in.close();

    } catch (IOException ioe) {
      System.out.println("IOException on socket: " + ioe);
      ioe.printStackTrace();

    } catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}

    try {
      s.close();
    } catch (IOException ioe) {
      System.out.println("IOException on socket: " + ioe);
      ioe.printStackTrace();
    }

  }

  //Controlla se il file è un'immagine
  private boolean isImage(String estensione) {
	  return (estensione.endsWith(".jpg")||estensione.endsWith(".png") || estensione.endsWith(".gif"));
  }

  //Funzione per mandare file txt e html
  private void sendRes(String res, PrintWriter out) throws Exception {
	  out.println("Content-type: text/html");
	  out.println();
	  FileInputStream fin = new FileInputStream(res);
      while(fin.available()!=0){
          int info= fin.read();
          out.write(info);
      }
  }

  //Funzione per mandare immagini
  private void sendImage(File f, OutputStream out) throws IOException {
	  String filename = f.getName();
	  String estensione = filename.substring(filename.lastIndexOf(".")+1);
	  BufferedImage buffImg = ImageIO.read(f);
      ImageIO.write(buffImg, estensione, out);
  }

}