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/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2014, Telestax Inc and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see 
 */

package org.mobicents.servlet.sip.catalina.session;

import org.apache.catalina.Context;
import org.apache.catalina.Engine;
import org.apache.catalina.Host;
import org.apache.catalina.Service;
import org.apache.catalina.connector.Connector;
import org.apache.log4j.Logger;
import org.mobicents.servlet.sip.catalina.CatalinaSipManager;
import org.mobicents.servlet.sip.core.SipContext;
import org.mobicents.servlet.sip.core.session.ConvergedSession;
import org.mobicents.servlet.sip.core.session.MobicentsSipApplicationSession;
import org.mobicents.servlet.sip.core.session.SessionManagerUtil;
import org.mobicents.servlet.sip.core.session.SipApplicationSessionKey;

/**
 * This class handles the additionnal sip features of a converged session
 * It is a delegate since it is used by many http session implementations classes (Standard and clustered ones) 
 * 
 * 
 * @author Jean Deruelle
 * @author Vladimir Ralev
 *
 */
public class ConvergedSessionDelegate {
	private static final Logger logger = Logger.getLogger(ConvergedSessionDelegate.class);
	// We are storing the app session id in the http sessions (since they are replicated) under this key
	private static final String APPLICATION_SESSION_ID_ATTRIBUTE_NAME = "org.mobicents.servlet.sip.SipApplicationSessionId";
	
	protected CatalinaSipManager sipManager;
	protected ConvergedSession httpSession;
	
	/**
	 * 
	 * @param sessionManager
	 */
	public ConvergedSessionDelegate(CatalinaSipManager manager, ConvergedSession httpSession) {
		this.sipManager = manager;
		this.httpSession = httpSession;
	}
	
	/*
	 * (non-Javadoc)
	 * @see javax.servlet.sip.ConvergedHttpSession#encodeURL(java.lang.String)
	 */
	public String encodeURL(String url) {

		StringBuffer urlEncoded = new StringBuffer();
		int indexOfQuestionMark = url.indexOf("?");
		if(indexOfQuestionMark > 0) {
			//Handles those cases : 
			//http://forums.searchenginewatch.com/showthread.php?t=9817
			//http://forums.searchenginewatch.com/showthread.php?p=72232#post72232
			String urlBeforeQuestionMark = url.substring(0, indexOfQuestionMark);
			String urlAfterQuestionMark = url.substring(indexOfQuestionMark);
			urlEncoded = urlEncoded.append(urlBeforeQuestionMark);
			urlEncoded = urlEncoded.append(";jsessionid=");
			urlEncoded = urlEncoded.append(httpSession.getId());
			urlEncoded = urlEncoded.append(urlAfterQuestionMark);
		} else {
			//Handles those cases : 
			//http://www.seroundtable.com/archives/003204.html#more		
			//http://www.seroundtable.com/archives#more
			int indexOfPoundSign = url.indexOf("#");
			if(indexOfPoundSign > 0) {
				String urlBeforePoundSign = url.substring(0, indexOfPoundSign);
				String urlAfterPoundSign = url.substring(indexOfPoundSign);
				urlEncoded = urlEncoded.append(urlBeforePoundSign);
				urlEncoded = urlEncoded.append(";jsessionid=");
				urlEncoded = urlEncoded.append(httpSession.getId());
				urlEncoded = urlEncoded.append(urlAfterPoundSign);
			} else {
				//Handles the rest
				//http://www.seroundtable.com/archives/003204.html
				//http://www.seroundtable.com/archives
				urlEncoded = urlEncoded.append(url);
				urlEncoded = urlEncoded.append(";jsessionid=");
				urlEncoded = urlEncoded.append(httpSession.getId());
			}
		}
		
		return urlEncoded.toString();
	}
	
	/*
	 * (non-Javadoc)
	 * @see javax.servlet.sip.ConvergedHttpSession#encodeURL(java.lang.String, java.lang.String)
	 */
	public String encodeURL(String relativePath, String scheme) {
		StringBuffer urlEncoded = new StringBuffer();
		//Context
		Context context = (Context)sipManager.getContainer();
		//Host
		Host host = (Host)context.getParent();
		//Service
		Service service = ((Engine)host.getParent()).getService();
		String hostname = host.getName();
		//retrieving the port corresponding to the specified scheme
		//TODO ask EG what if the scheme is not supported on the server ?
		int port = -1;		
		Connector[] connectors = service.findConnectors();
		int i = 0;
		while (i < connectors.length && port < 0) {
			if(scheme != null && connectors[i].getProtocol().toLowerCase().contains(scheme.toLowerCase())) {
				port = connectors[i].getPort();
			}
			i++;
		}
		urlEncoded = urlEncoded.append(scheme);
		urlEncoded = urlEncoded.append("://");
		urlEncoded = urlEncoded.append(hostname);
		urlEncoded = urlEncoded.append(":");
		urlEncoded = urlEncoded.append(port);
		urlEncoded = urlEncoded.append(((Context)sipManager.getContainer()).getPath());
		urlEncoded = urlEncoded.append(encodeURL(relativePath));
		return urlEncoded.toString();
	}

	/*
	 * (non-Javadoc)
	 * @see javax.servlet.sip.ConvergedHttpSession#getApplicationSession()
	 */
	public MobicentsSipApplicationSession getApplicationSession(boolean create) {		
		
		//First check if the http session has the app session id in its attributes		
		SipApplicationSessionKey key = null;
		// need to check if the session is still valid
		if(httpSession.isValidIntern()) {	
			key = (SipApplicationSessionKey) httpSession.getAttribute(APPLICATION_SESSION_ID_ATTRIBUTE_NAME); 
		}
		SipContext sipContext = (SipContext)sipManager.getContainer();
		if(key != null) {
			MobicentsSipApplicationSession sipAppSession = sipManager.getSipApplicationSession(key, false);
			if (sipAppSession != null) {
				// make sure to acquire this app session and add it to the set of app sessions we monitor in the context of the application
				// to release them all when we exit application code
				sipContext.enterSipApp(sipAppSession, null, true, true);
				return sipAppSession;
			} else {
				if(logger.isDebugEnabled()) {
					logger.debug(key + " found in http session " + httpSession.getId() + " but not present in the manager. already invalidated ? creating new sip application session");
				}
			}
		}
		
		//Otherwise proceed as normally
		
		//the application session if currently associated is returned,
		MobicentsSipApplicationSession sipApplicationSession =
			sipManager.findSipApplicationSession(httpSession);
		if(sipApplicationSession == null && create) {
			//however if no application session is associated it is created, 
			//associated with the HttpSession and returned.
			
			//not needed anymore since the sipappsesionkey is not a callid anymore but a rnadom uuid
//			ExtendedListeningPoint listeningPoint = 
//				sipNetworkInterfaceManager.getExtendedListeningPoints().next();						
			SipApplicationSessionKey sipApplicationSessionKey = SessionManagerUtil.getSipApplicationSessionKey(
					sipContext.getApplicationName(), 
					null,
					null);
			
			sipApplicationSession = 
				sipManager.getSipApplicationSession(sipApplicationSessionKey, true);
			
			// Store the App Session ID in the HTTP sessions to recover it from there when it's transfered to a new node.
			httpSession.setAttribute(APPLICATION_SESSION_ID_ATTRIBUTE_NAME, 
					sipApplicationSession.getKey());
			sipApplicationSession.addHttpSession(httpSession);			
		}
		if(sipApplicationSession != null) {
			// make sure to acquire this app session and add it to the set of app sessions we monitor in the context of the application
			// to release them all when we exit application code
			sipContext.enterSipApp(sipApplicationSession, null, true, true);
			return sipApplicationSession.getFacade();
		} else {
			return null;
		}
//		return sipApplicationSession;
	}

}