package org.gcube.application.framework.core.session;

import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;

import javax.servlet.http.HttpSession;

import org.gcube.common.authorization.library.provider.SecurityTokenProvider;
import org.gcube.common.scope.api.ScopeProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SessionManager {
	
	/** The logger. */
	private static final Logger logger = LoggerFactory.getLogger(SessionManager.class);

//	protected static Thread thread = new CleanSessionThread();
	protected static SessionManager sessionManager = new SessionManager();
	protected HashMap<String, ASLSession> sessions;
	
	protected SessionManager() {
		sessions = new HashMap<String, ASLSession>();
//		thread.setDaemon(true);
//		thread.start();
	}

	public static SessionManager getInstance() {
		return sessionManager;
	}
	
	
	public void setASLSession(HttpSession userSession, String username){
		ASLSession aslSession = new ASLSession(userSession, username);
		sessions.put(userSession.getId() + "_" + username, aslSession);
	}
	
	public ASLSession getASLSession(String externalSessionID, String username)
	{
		ASLSession session = sessions.get(externalSessionID + "_" + username);
//		if(session == null || !session.isValid()  ||  !session.getUsername().equals(username))
//		{
//			session = new ASLSession(externalSessionID, username);
//			sessions.put(externalSessionID + "_" + username, session);
//		}
//		 if (session.getScope()!=null) //covers first helper's invocation
//	         ScopeProvider.instance.set(session.getScopeName());
//
//		if (session.getSecurityToken()!=null){
//			logger.debug("Setting SecurityTokenProvider to: "+session.getSecurityToken()+" in thread "+Thread.currentThread().getId());	  
//			SecurityTokenProvider.instance.set(session.getSecurityToken());
//		}
		return session;
	}

//	@Override
//	protected void finalize() throws Throwable {
//		thread.interrupt();
//		logger.debug(new Date(System.currentTimeMillis()) + " clean thread was interrupted");
//		thread.join();
//		logger.debug(new Date(System.currentTimeMillis()) + " clean thread was joint");
//		super.finalize();
//	}
	
	
//	protected static class CleanSessionThread extends Thread
//	{
//		public void run()
//		{
//			while(true)
//			{
//				try {
//					Thread.sleep(300000);
//				} catch (InterruptedException e) {
//					logger.error("Exception:", e);
//					logger.debug(new Date(System.currentTimeMillis()) + " clean thread was interrupted (in clean thread)");
//					break;
//				}
//				//TODO: cleanup invalid sessions: add locks...
//				Set<String> keys = sessionManager.sessions.keySet();
//				Iterator<String> iter = keys.iterator();
//				while(iter.hasNext())
//				{
//					String extSessionID = iter.next();
//					if(!sessionManager.sessions.get(extSessionID).isValid())
//					{
//						sessionManager.sessions.remove(extSessionID);
//					}
//				}
//			}
//			logger.debug(new Date(System.currentTimeMillis()) + " clean thread was terminated");
//		}
//
//	}
}