/*

  * Copyright (c) 2003-2011, Simon Brown

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   - Redistributions of source code must retain the above copyright

  *     notice, this list of conditions and the following disclaimer.

  *

  *   - Redistributions in binary form must reproduce the above copyright

  *     notice, this list of conditions and the following disclaimer in

  *     the documentation and/or other materials provided with the

  *     distribution.

  *

  *   - Neither the name of Pebble nor the names of its contributors may

  *     be used to endorse or promote products derived from this software

  *     without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  * POSSIBILITY OF SUCH DAMAGE.

  */

 package net.sourceforge.pebble.web.action;

 import net.sourceforge.pebble.Constants;

 import net.sourceforge.pebble.domain.Blog;

 import net.sourceforge.pebble.search.SearchException;

 import net.sourceforge.pebble.search.SearchHit;

 import net.sourceforge.pebble.search.SearchResults;

 import net.sourceforge.pebble.util.Pageable;

 import net.sourceforge.pebble.web.view.RedirectView;

 import net.sourceforge.pebble.web.view.View;

 import net.sourceforge.pebble.web.view.impl.AdvancedSearchView;

 import net.sourceforge.pebble.web.view.impl.SearchResultsView;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import java.io.UnsupportedEncodingException;

 /**

  * Performs a search on the current blog.

  *

  * @author    Simon Brown

  */

 public class SearchAction extends Action {

   /** the log used for this action */

   private static final Log log = LogFactory.getLog(SearchAction.class);

   /** the number of results to show per page */

   static final int PAGE_SIZE = 20;

   /**

    * Peforms the processing associated with this action.

    *

    * @param request  the HttpServletRequest instance

    * @param response the HttpServletResponse instance

    * @return the name of the next view

    */

   public View process(HttpServletRequest request, HttpServletResponse response) throws ServletException {

     Blog blog = (Blog)getModel().get(Constants.BLOG_KEY);

     String query = request.getParameter("query");

     if (query == null || query.trim().length() == 0) {

       if (blog instanceof Blog) {

         return new AdvancedSearchView();

       }

     }

     String pageAsString = request.getParameter("page");

     int page = 1;

     if (pageAsString == null || pageAsString.length() == 0) {

       page = 1;

     } else {

       try {

         page = Integer.parseInt(pageAsString);

       } catch (NumberFormatException nfe) {

       }

     }

     try {

       SearchResults results = blog.getSearchIndex().search(query);

       if (results.getNumberOfHits() == 1) {

         // if there is only one hit, redirect the user to it without the

         // search results page

         SearchHit hit = (SearchHit)results.getHits().get(0);

         return new RedirectView(hit.getPermalink());

       } else {

         // show all results on the search results page

         String sort = request.getParameter("sort");

         if (sort != null && sort.equalsIgnoreCase("date")) {

           results.sortByDateDescending();

         } else {

           results.sortByScoreDescending();

         }

         Pageable pageable = new Pageable(results.getHits());

         pageable.setPageSize(PAGE_SIZE);

         pageable.setPage(page);

         try {

           getModel().put("searchResults", results);

           getModel().put("pageable", pageable);

           getModel().put("query", java.net.URLEncoder.encode(query, blog.getCharacterEncoding()));

         } catch (UnsupportedEncodingException uee) {

           log.error(uee);

         }

         return new SearchResultsView();

       }

     } catch (SearchException se) {

       throw new ServletException(se);

     }

   }

 }