/*
 * Copyright 2000-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.struts.webapp.example;

import java.lang.reflect.InvocationTargetException;

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

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/**
 * Implementation of <strong>Action</strong> that populates an instance of
 * <code>SubscriptionForm</code> from the currently specified subscription.
 *
 * @version $Revision: 1.1 $ $Date: 2004/07/29 22:23:03 $
 */
public final class EditSubscriptionAction extends Action {

    // ----------------------------------------------------- Instance Variables

    /**
     * The <code>Log</code> instance for this application.
     */
    private Log log = LogFactory.getLog("org.apache.struts.webapp.Example");

    // --------------------------------------------------------- Public Methods

        // See superclass for Javadoc
    public ActionForward execute(
        ActionMapping mapping,
        ActionForm form,
        HttpServletRequest request,
        HttpServletResponse response)
        throws Exception {

        // Extract attributes we will need
        HttpSession session = request.getSession();
        String action = request.getParameter("action");
        if (action == null) {
            action = "Create";
        }
        
        String host = request.getParameter("host");
        if (log.isDebugEnabled()) {
            log.debug("EditSubscriptionAction:  Processing " + action + " action");
        }

        // Is there a currently logged on user?
        User user = (User) session.getAttribute(Constants.USER_KEY);
        if (user == null) {
            if (log.isTraceEnabled()) {
                log.trace(" User is not logged on in session " + session.getId());
            }
            return (mapping.findForward("logon"));
        }

        // Identify the relevant subscription
        Subscription subscription =
            user.findSubscription(request.getParameter("host"));
            
        if ((subscription == null) && !action.equals("Create")) {
            if (log.isTraceEnabled()) {
                log.trace(
                    " No subscription for user "
                        + user.getUsername()
                        + " and host "
                        + host);
            }
            
            return (mapping.findForward("failure"));
        }
        
        if (subscription != null) {
            session.setAttribute(Constants.SUBSCRIPTION_KEY, subscription);
        }

        SubscriptionForm subform = (SubscriptionForm) form;
        subform.setAction(action);
        if (!action.equals("Create")) {
            if (log.isTraceEnabled()) {
                log.trace(" Populating form from " + subscription);
            }
            
            try {
                PropertyUtils.copyProperties(subform, subscription);
                subform.setAction(action);
                
            } catch (InvocationTargetException e) {
                Throwable t = e.getTargetException();
                if (t == null)
                    t = e;
                log.error("SubscriptionForm.populate", t);
                throw new ServletException("SubscriptionForm.populate", t);
                
            } catch (Throwable t) {
                log.error("SubscriptionForm.populate", t);
                throw new ServletException("SubscriptionForm.populate", t);
            }
        }

        // Forward control to the edit subscription page
        if (log.isTraceEnabled()) {
            log.trace(" Forwarding to 'success' page");
        }
        
        return (mapping.findForward("success"));

    }

}
