/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.exoplatform.services.jcr.ext.resource;

import org.exoplatform.common.http.HTTPStatus;
import org.exoplatform.services.jcr.RepositoryService;
import org.exoplatform.services.jcr.config.RepositoryConfigurationException;
import org.exoplatform.services.jcr.core.ManageableRepository;
import org.exoplatform.services.jcr.ext.app.SessionProviderService;
import org.exoplatform.services.jcr.ext.common.SessionProvider;
import org.exoplatform.services.rest.resource.ResourceContainer;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.jcr.LoginException;
import javax.jcr.NoSuchWorkspaceException;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;

/**
 * Created by The eXo Platform SAS.
 * 
 * REST service to expose JCR node as either sys or doc view.
 * 
 * @author Gennady Azarenkov
 */
@Path("/jcr-xml-view")
public class XMLViewNodeRepresentationRenderer implements ResourceContainer
{

   protected RepositoryService repoService;

   protected SessionProviderService sessionProviderService;

   /**
    * @param repoService
    * @param sessionProviderService
    */
   public XMLViewNodeRepresentationRenderer(RepositoryService repoService, SessionProviderService sessionProviderService)
   {
      this.repoService = repoService;
      this.sessionProviderService = sessionProviderService;
   }

   /**
    * Gives the XML representation of a given node.
    * 
    * @param repoName - repository name
    * @param repoPath - node path including workspace name
    * @param viewType - either "system" or "document"
    * @param uriInfo
    * @return XML view of requested node
    * @response
    * {code}
    * "xml" : the XML representation of a given node
    * {code}
    * @LevelAPI Unsupported
    */
   @GET
   @Path("/{viewType}/{repoName}/{repoPath:.*}/")
   public Response getXML(@PathParam("repoName") String repoName, @PathParam("repoPath") String repoPath,
      @PathParam("viewType") String viewType, @Context UriInfo uriInfo)
   {

      ByteArrayOutputStream bos;
      try
      {
         ManageableRepository repo = this.repoService.getRepository(repoName);
         SessionProvider sp = sessionProviderService.getSessionProvider(null);

         if (sp == null)
            throw new RepositoryException("SessionProvider is not properly set. Make the application calls"
               + "SessionProviderService.setSessionProvider(..) somewhere before ("
               + "for instance in Servlet Filter for WEB application)");

         Session session = sp.getSession(workspaceName(repoPath), repo);

         bos = new ByteArrayOutputStream();
         if (viewType != null && (viewType.equalsIgnoreCase("system") || viewType.equalsIgnoreCase("sys")))
            session.exportSystemView(path(repoPath), bos, false, false);
         else
            session.exportDocumentView(path(repoPath), bos, false, false);

      }
      catch (LoginException e)
      {
         return Response.status(HTTPStatus.FORBIDDEN).entity(e.getMessage()).build();
      }
      catch (NoSuchWorkspaceException e)
      {
         return Response.serverError().entity(e.getMessage()).build();
      }
      catch (RepositoryException e)
      {
         return Response.serverError().entity(e.getMessage()).build();
      }
      catch (RepositoryConfigurationException e)
      {
         return Response.serverError().entity(e.getMessage()).build();
      }
      catch (IOException e)
      {
         return Response.serverError().entity(e.getMessage()).build();
      }

      return Response.ok().entity(bos.toByteArray()).type(MediaType.TEXT_XML).build();

   }

   protected String workspaceName(String repoPath)
   {
      return repoPath.split("/")[0];
   }

   protected String path(String repoPath)
   {
      String path = repoPath.substring(workspaceName(repoPath).length());

      if (!"".equals(path))
      {
         return path;
      }

      return "/";
   }
}