/* ======================================================================
   Parts Copyright 2006 University of Leeds, Oxford University, University of the Highlands and Islands.

   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 org.bodington.servlet.facilities;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collections;
import java.util.List;

import org.apache.log4j.Logger; 

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;

import org.bodington.server.BuildingServerException;
import org.bodington.server.resources.FeedResource;
import org.bodington.server.resources.NewsFeedResource;
import org.bodington.server.resources.Resource;
import org.bodington.servlet.Request;

public class NewsFeedFacility extends FeedFacility
{
    private static Logger log = Logger.getLogger(NewsFeedFacility.class);
    protected static final String URL_PARAMETER = "newsfeedURL";
    protected static final String FACILITY_NAME = "Newsfeed";

    public NewsFeedFacility() throws BuildingServerException
    {
        //        try
        //        {
        //          TODO: get this working:
        //            createStylesheetTemplate(TRANSFORM_STYLESHEET);
        //        }
        //        catch (JaferException ex)
        //        {
        //            String message = "Error loading XSL stylesheet for NewsFeed
        // resource";
        //            Logger.getLogger("org.bodington.server").severe(message);
        //            throw new BuildingServerException(ex.getMessage(), message);
        //        }
    }

    public Resource newResource()
    {
        return new NewsFeedResource();
    }


    public List initResource(HttpServletRequest req, Resource new_resource)
    {
        if (new_resource instanceof NewsFeedResource)
        {
            NewsFeedResource newsFeed = (NewsFeedResource) new_resource;
            
            String url = req.getParameter(getURLParameter());

            if ( url == null || url.equals(""))
            {
            	return Collections.singletonList("URL cannot be empty.");
            }
                
            newsFeed.setURL(req.getParameter(getURLParameter()));

        }
        else
        {
            throw new IllegalArgumentException("Resource must be a NewsFeedResource");
        }
        return super.initResource(req, new_resource);
    }
    
    public boolean initResource( Resource original_resource, Resource new_resource )
    throws BuildingServerException {
    	
    	if ( !(new_resource instanceof NewsFeedResource) )
    		throw new BuildingServerException( 
    		"Error: The wrong type of resource was created." );
    	
        NewsFeedResource original = (NewsFeedResource)original_resource;
        NewsFeedResource copy = (NewsFeedResource)new_resource;
        
        //set URL to get newsfeed from:
        copy.setFeedURL( original.getFeedURL() );
        // set max number of items to display:
        copy.setMaxNumberOfItems( original.getMaxNumberOfItems() );
        // set HTMl tag to insert between items in display:
        copy.setItemSeparationTag( original.getItemSeparationTag() );
        // copy other display settings which are packed into an int:
        copy.setNewsFeedFlags( original.getNewsFeedFlags() );
    	
    	return true;
    }

    public void insert(Request req, PrintWriter out, String command,
        String insertname) throws ServletException, IOException
    {
        log.debug(" NewsFeedFacility insert()");

        if (!(req.getResource() instanceof NewsFeedResource))
        {
            String message = "Wrong type of resource found, expecting NewsFeed resource";
            log.error(message);
            return;
        }

        NewsFeedResource resource = (NewsFeedResource) req.getResource();

        if (command.equalsIgnoreCase("displayfeed"))
        {
            String html = getFrameDisplay(resource);
            out.print(html);
            return;
        }

        // TODO Do this another way...
        if (command.equalsIgnoreCase("modifyproperties"))
        {
            if (req.getParameter("savesettings") != null) // Save button has
                                                          // been pushed...
            {
                updateDisplayInline(req, resource);
                updateDisplayImage(req, resource);
                updateDisplayTitle(req, resource);
                updateDisplayDescription(req, resource);
                updateDisplayAuthor(req, resource);
                updateAllowTitleLinks(req, resource);
                updateDisplayDate(req, resource);
                updateMaxNumberOfItems(req, resource);
                updateDisplayItemTitles(req, resource);
                updateDisplayItemAuthors(req, resource);
                updateDisplayItemContent(req, resource);
                updateDisplayExcerpt(req, resource);
                updateDisplayItemDate(req, resource);
                updateItemSeparationTag(req, resource);
                try
                {
                    updateURL(req, resource);
                    if (resource.isUnsaved()) resource.save();
                }
                catch (BuildingServerException ex)
                {
                    out.println("Failed to update: "+ ex);
                }
            }
            return;
        }

        if (displayCurrentSettings(command, resource, out)) return;

        super.insert(req, out, command, insertname);
    }

    protected String getURLParameter()
    {
        return URL_PARAMETER;
    }

    protected String getFacilityName()
    {
        return FACILITY_NAME;
    }

}