package uk.ac.ebi.intenz.webapp.controller.helper.forwards;
   
   import java.sql.Connection;
   import java.util.Map;
   
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
   
   import org.apache.log4j.Logger;
  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 org.apache.struts.actions.ForwardAction;
  import org.apache.struts.taglib.html.Constants;
  
  import uk.ac.ebi.intenz.domain.constants.Status;
  import uk.ac.ebi.intenz.mapper.EnzymeEntryMapper;
  import uk.ac.ebi.intenz.webapp.dtos.EnzymeDTO;
  import uk.ac.ebi.intenz.webapp.utilities.ControlFlowToken;
  import uk.ac.ebi.intenz.webapp.utilities.EntryLockSingleton;
  
  /**
   * This class ...
   *
   * @author Michael Darsow
   * @version $Revision: 1.3 $ $Date: 2008/11/17 17:14:10 $
   */
  public class ModifyEnzymeFWDAction extends ForwardAction {
  
    private static final Logger LOGGER =
  	  Logger.getLogger(ModifyEnzymeFWDAction.class.getName());
    private final static String SEARCH_BY_ID_ACTION_FWD = "searchId";
    private final static String ERROR_FWD = "error";
  
    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
                                 HttpServletResponse response) throws Exception {
      EnzymeDTO enzymeDTO = (EnzymeDTO) request.getSession().getAttribute("enzymeDTO");
      ActionMessages errors = new ActionMessages();
      Long enzymeId = new Long(enzymeDTO.getId());
  
      // Check if the current entry is still valid.
      if (request.getParameter(Constants.TOKEN_KEY) != null && !ControlFlowToken.isValid(request)) {
        Map tokenHashtable = (Map) request.getSession().getAttribute("tokenHashtable");
        LOGGER.debug("Entry with ID " + enzymeId + " is being discarded ...");
        enzymeId = (Long) tokenHashtable.get(request.getParameter(Constants.TOKEN_KEY));
        LOGGER.debug("... entry with ID " + enzymeId + " will be loaded instead.");
  
        // Store a message to inform the user about the reload.
        errors.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage("errors.application.entry.reloaded.noec"));
        saveErrors(request, errors);
  
        // Set view where to forward to after the entry has been reloaded.
        ActionForward forward = mapping.findForward(SEARCH_BY_ID_ACTION_FWD);
        StringBuffer path = new StringBuffer(forward.getPath());
        boolean isQuery = (path.indexOf("?") > -1);
        if (isQuery) {
          path.append("&view=INTENZ&reload=true&id=");
        } else {
          path.append("?view=INTENZ&reload=true&id=");
        }
        path.append(enzymeId);
        request.setAttribute("title", "Reload");
        return new ActionForward(path.toString());
      }
  
      // Check if a clone already exists.
      if (enzymeDTO.getStatusCode().equals(Status.APPROVED.getCode())) {
        EnzymeEntryMapper enzymeEntryMapper = new EnzymeEntryMapper();
        Connection con = (Connection) request.getSession().getAttribute("connection");
        if (enzymeEntryMapper.cloneExists(enzymeId, con)) {
          errors.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage("errors.application.clone.exists", enzymeDTO.getEc()));
          saveErrors(request, errors);
          request.setAttribute("title", "Error - IntEnz Curator Application");
          return mapping.findForward(ERROR_FWD);
        }
      }
  
      ControlFlowToken.setToken(request, enzymeId); // Set token.
  
      // Try to lock the entry.
      EntryLockSingleton els = (EntryLockSingleton) request.getSession().getServletContext().getAttribute("entryLock");
      if (!els.setLock("" + enzymeId, request.getUserPrincipal().getName())) {
        errors.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage("errors.application.entry.locked", enzymeDTO.getEc()));
        saveErrors(request, errors);
        return mapping.findForward(ERROR_FWD);
      }
      
      return super.execute(mapping, form, request, response);
    }
  }