package mx.edu.um.webapp.action;

import java.io.PrintWriter;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import mx.edu.um.webapp.listener.StartupListener;


/**
 * This class is used to reload the drop-downs initialized in the
 * StartupListener.
 *
 * <p>
 * <a href="ReloadAction.java.html"><i>View Source</i></a>
 * </p>
 *
 * @author <a href="mailto:matt@raibledesigns.com">Matt Raible</a>
 *
 * @struts.action path="/reload" validate="false" roles="admin"
 */
public final class ReloadAction extends BaseAction {

    public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response)
    throws Exception {
        if (log.isDebugEnabled()) {
            log.debug("Entering 'execute' method");
        }

        StartupListener.setupContext(getServlet().getServletContext());

        String referer = request.getHeader("Referer");

        if (referer != null) {
            log.debug("reload complete, reloading user back to: " + referer); 
            
            ActionMessages messages = new ActionMessages();
            messages.add(ActionMessages.GLOBAL_MESSAGE,
                         new ActionMessage("reload.succeeded"));
            saveMessages(request.getSession(), messages);
            
            response.sendRedirect(response.encodeRedirectURL(referer));
            return null;
        } else {
            response.setContentType("text/html");

            PrintWriter out = response.getWriter();

            out.println("<html>");
            out.println("<head>");
            out.println("<title>Context Reloaded</title>");
            out.println("</head>");
            out.println("<body bgcolor=\"white\">");
            out.println("<script type=\"text/javascript\">");
            out.println("alert('Context Reload Succeeded! Click OK to continue.');");
            out.println("history.back();");
            out.println("</script>");
            out.println("</body>");
            out.println("</html>");
        }

        return null;
    }
}