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/*-*- mode: Java; tab-width:8 -*-*/

package io.soluble.pjb.servlet;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import io.soluble.pjb.bridge.ISession;
import io.soluble.pjb.bridge.http.IContextFactory;

/**
 * Wraps the J2EE session interface
 */
final class HttpSessionFacade implements ISession {

    private HttpSession session;
    private int timeout;
    private HttpSession sessionCache = null;
    private boolean isNew;
    private IContextFactory ctxFactory;

    HttpSession getCachedSession() {
        if (sessionCache != null) return sessionCache;
        sessionCache = session;
        sessionCache.setMaxInactiveInterval(timeout);
        return sessionCache;
    }

    private HttpSessionFacade(IContextFactory ctxFactory, ServletContext ctx, HttpServletRequest req, HttpServletResponse res, short clientIsNew, int timeout) {
        this.ctxFactory = ctxFactory;
        switch (clientIsNew) {
            case ISession.SESSION_CREATE_NEW:
                this.session = req.getSession(true);
                break;
            case ISession.SESSION_GET_OR_CREATE:
                this.session = req.getSession();
                break;
            case ISession.SESSION_GET:
                this.session = req.getSession(false);
                break;
            default:
                throw new IllegalStateException("clientIsNew:" + clientIsNew);
        }
        this.timeout = timeout;
        this.isNew = session.isNew();
    }

    /**
     * Returns the HttpServletRequest
     *
     * @return The HttpServletRequest.
     * Use {@link HttpContext#getHttpServletRequest()}
     */
    public HttpServletRequest getHttpServletRequest() {
        return (HttpServletRequest) ((HttpContext) ctxFactory.getContext()).getHttpServletRequest();
    }

    /**
     * Returns the ServletContext
     *
     * @return The ServletContext.
     * Use {@link HttpContext#getServletContext()}
     */
    public ServletContext getServletContext() {
        return (ServletContext) ((HttpContext) ctxFactory.getContext()).getServletContext();
    }

    /**
     * Returns the ServletResponse
     *
     * @return The ServletResponse.
     * Use {@link HttpContext#getHttpServletResponse()}
     */
    public HttpServletResponse getHttpServletResponse() {
        return (HttpServletResponse) ((HttpContext) ctxFactory.getContext()).getHttpServletResponse();
    }

    /**
     * @inheritDoc
     */
    public Object get(Object ob) {
        return getCachedSession().getAttribute(String.valueOf(ob));
    }

    /**
     * @inheritDoc
     */
    public void put(Object ob1, Object ob2) {
        getCachedSession().setAttribute(String.valueOf(ob1), ob2);
    }

    /**
     * @inheritDoc
     */
    public Object remove(Object ob) {
        String key = String.valueOf(ob);
        Object o = getCachedSession().getAttribute(key);
        if (o != null)
            getCachedSession().removeAttribute(key);
        return o;
    }

    /**
     * @inheritDoc
     */
    public void setTimeout(int timeout) {
        getCachedSession().setMaxInactiveInterval(timeout);
    }

    /**
     * @inheritDoc
     */
    public int getTimeout() {
        return getCachedSession().getMaxInactiveInterval();
    }

    /**
     * @inheritDoc
     */
    public int getSessionCount() {
        return -1;
    }

    /**
     * @inheritDoc
     */
    public boolean isNew() {
        return isNew;
    }

    /**
     * @inheritDoc
     */
    public void destroy() {
        getCachedSession().invalidate();
    }

    /**
     * @inheritDoc
     */
    public void putAll(Map vars) {
        for (Iterator ii = vars.keySet().iterator(); ii.hasNext(); ) {
            Object key = ii.next();
            Object val = vars.get(key);
            put(key, val);
        }
    }

    /**
     * @inheritDoc
     */
    public Map getAll() {
        HttpSession session = getCachedSession();
        HashMap map = new HashMap();
        for (Enumeration ee = session.getAttributeNames(); ee.hasMoreElements(); ) {
            Object key = ee.nextElement();
            Object val = get(key);
            map.put(key, val);
        }
        return map;
    }

    /**
     * @inheritDoc
     */
    public long getCreationTime() {
        return getCachedSession().getCreationTime();
    }

    /**
     * @inheritDoc
     */
    public long getLastAccessedTime() {
        return getCachedSession().getLastAccessedTime();
    }

    public static ISession getFacade(
            IContextFactory factory,
            ServletContext kontext, HttpServletRequest req,
            HttpServletResponse res, short clientIsNew, int timeout) {

        if ((clientIsNew != ISession.SESSION_GET) || ((clientIsNew == ISession.SESSION_GET) && req.getSession(false) != null))
            return new HttpSessionFacade(factory, kontext, req, res, clientIsNew, timeout);
        else
            return null;
    }
}