/*
    * Copyright 2011 FatWire Corporation. All Rights Reserved.
    *
    * 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 com.fatwire.gst.foundation.controller.action;
  
  import javax.servlet.ServletContext;
  import javax.servlet.http.HttpServletResponse;
  
  import COM.FutureTense.Interfaces.ICS;
  import COM.FutureTense.Util.ftErrors;
  
  import com.fatwire.gst.foundation.CSRuntimeException;
  import com.fatwire.gst.foundation.controller.AbstractController;
  import com.fatwire.gst.foundation.facade.RenderUtils;
  
  /**
   * Dispatching Controller. Relies on ActionLocator to dispatch control to Action
   * classes. An ActionNameResolver is used to resolve the action name on the
   * current request.
   * 
   * @author Dolf Dijkstra
   * @since May 26, 2011
   */
  public abstract class AbstractActionController extends AbstractController {
  
      public AbstractActionController(ICS ics) {
          super(ics);
      }
  
      @Override
      public final void doExecute() {
  
          // record seid and eid
          RenderUtils.recordBaseCompositionalDependencies(ics);
  
          // find the action locator
          LOG.trace("Dispatcher looking for action locator");
          final ActionLocator locator = getActionLocator();
          if (locator == null)
              throw new IllegalStateException("No ActionLocator returned by class " + getClass().getName());
          if (LOG.isTraceEnabled()) {
              LOG.trace("Using action locator: " + locator.getClass().getName());
          }
          ActionNameResolver resolver = getActionNameResolver();
          if (resolver == null)
              throw new IllegalStateException("No ActionNameResolver returned by class " + getClass().getName());
          String actionName = resolver.resolveActionName(ics);
          // get the action
          final Action action = locator.getAction(ics, actionName);
          if (LOG.isTraceEnabled()) {
              LOG.trace("Using action: " + action.getClass().getName());
          }
          if (action == null)
              throw new IllegalStateException(
                      "No Action found. An ActionLocator should always return a Action. ActionLocation "
                              + locator.getClass().getName() + " did not return an action for '" + actionName + "'.");
  
          // execute the command
          action.handleRequest(ics);
          LOG.trace("Request handling complete");
      }
  
      /**
       * @return the ActionNameResolver
       */
      protected abstract ActionNameResolver getActionNameResolver();
  
      /**
       * @return the ActionLocator.
       */
      protected abstract ActionLocator getActionLocator();
  
      @SuppressWarnings("deprecation")
      protected ServletContext getServletContext() {
          return ics.getIServlet().getServlet().getServletContext();
      }
  
      @Override
      public final void handleException(final Exception e) {
          if (LOG.isTraceEnabled()) {
              // Give developer a clue in case error pages aren't configured
              // properly.
              LOG.trace("Action threw an exception and an error code will be returned.  Exception: " + e, e);
          }
          if (e instanceof CSRuntimeException) {
              handleCSRuntimeException((CSRuntimeException) e);
          } else {
             sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
         }
     }
 
     /**
      * This method transforms errno values into http status codes and sets them
      * using the X-Fatwire-Status header.
      * <p/>
      * Only some errnos are handled by this base class.
      * <p/>
      * More info coming soon
      * 
      * @param e exception
      */
     protected final void handleCSRuntimeException(final CSRuntimeException e) {
         switch (e.getErrno()) {
             case HttpServletResponse.SC_BAD_REQUEST:
             case ftErrors.badparams:
                 sendError(HttpServletResponse.SC_BAD_REQUEST, e);
                 break;
             case HttpServletResponse.SC_NOT_FOUND:
             case ftErrors.pagenotfound:
                 sendError(HttpServletResponse.SC_NOT_FOUND, e);
                 break;
             case HttpServletResponse.SC_FORBIDDEN:
             case ftErrors.noprivs:
                 sendError(HttpServletResponse.SC_FORBIDDEN, e);
                 break;
             default:
                 sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
                 break;
         }
     }
 
 }