import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import org.w3c.dom.Document;
import com.facebook.api.*;

public class AbstractFacebookServlet extends javax.servlet.http.HttpServlet
		implements javax.servlet.Servlet {
	protected static final String FB_APP_URL = "http://apps.facebook.com/javapages/";
	protected static final String FB_APP_ADD_URL = "http://www.facebook.com/add.php?api_key=bd5896c1ffe7ebd69e07bbd720d357ba";
	protected static final String FB_API_KEY = "bd5896c1ffe7ebd69e07bbd720d357ba";
	private static final String FB_SECRET_KEY = "8e5bce24cb11fc7d22ed043ebc69860f";

	FacebookJsonRestClient json=null;
	
	public AbstractFacebookServlet() {
		super();
	}

	/*
	 * This method is used by all of the application's servlets
	 * (or  web framework actions) to authenticate the app with
	 * Facebook.
	 */

	//protected FacebookRestClient getAuthenticatedFacebookClient(
	protected FacebookJsonRestClient getAuthenticatedFacebookClient(
			HttpServletRequest request, HttpServletResponse response)throws IOException {
		IFacebookRestClient json;
		IFacebookRestClient xml;
//		PrintWriter servletOutput;  // output of servlet. HTML or FBML out
	//	String loginPage = "http://www.facebook.com/login.php?api_key="+FB_API_KEY+"&v=1.0&canvas=true";
		//String aboutPage = "http://www.facebook.com/apps/application.php?id=20063872087";



//		servletOutput = response.getWriter(); // response is sent to ServletOutput
//		response.setContentType( "text/html" );

		// do authentication  
//		String user =null;
		String sessionKey;//=null;
		sessionKey = request.getParameter(FacebookParam.SESSION_KEY.toString());  // Session Key passed as request parameter
		if (sessionKey==null) { // If there is not session key, they user not logged in
/*
  
 			String newFacebook =  request.getParameter("fb_sig_in_new_facebook");
			if (newFacebook.equals("1")){
				loginPage = "http://www.new.facebook.com/login.php?api_key="+FB_API_KEY+"&v=1.0&canvas=true";
				//aboutPage = "http://www.new.facebook.com/apps/application.php?id=20063872087";
			}
			servletOutput.println("<fb:redirect url=" + loginPage + "/>");  // Facebook Redirect to login page
*/
			return (null);
		}
		else{  // user is logged on
			json = (FacebookJsonRestClient) new FacebookJsonRestClient( FB_API_KEY, FB_SECRET_KEY, sessionKey);
	/*
			try {
				json.notifications_send("testing 1 2 3");
			} catch (FacebookException e) {
				System.out.println("trying notification  " + e);
			}
			catch (IOException e) {
				System.out.println(e);
			}
			return ((FacebookJsonRestClient)json);
		}
*/
			return ((FacebookJsonRestClient)json);
		}
			
			
		/*

 		Facebook fb = new Facebook(request, response, FB_API_KEY, FB_SECRET_KEY);


		String next = request.getServletPath().substring(1);

		if (fb.requireLogin(next))
			return null;
		 */


		//return fb.getFacebookRestClient();
		//return json;
		/*		
		String user =null;
		String sessionKey=null;
		//auth_token=edc9cbd93649f43d606ea3420cb1fb75
		String auth = request.getParameter("auth_token")	;
		if (auth==null) { // If there is not session key, they user not logged in
			return null;  
			}
		else{
			Facebook fb = new Facebook(request, response, FB_API_KEY, FB_SECRET_KEY);
			return fb.getFacebookRestClient();
		}


		 */	
	}

}