/* ======================================================================
   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 javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;

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

public class BlogFacility extends FeedFacility
{
    private static Logger log = Logger.getLogger(BlogFacility.class);
    protected static final String URL_PARAMETER = "blogURL";
    protected static final String FACILITY_NAME = "Blog";

    public BlogFacility() 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 BlogResource();
    }

    public List initResource(HttpServletRequest breq, Resource new_resource)
    {
        String url;

        if (!(new_resource instanceof BlogResource))
            throw new IllegalArgumentException(
                "Technical problem: An incorrect type of resource was created.");

        // Only the URL is set at creation time, other properties are set to the
        // defaults.
        if (breq.getParameter(getURLParameter()) != null
            && breq.getParameter(getURLParameter()).length() > 0)
        {
            url = breq.getParameter(getURLParameter());
            ((BlogResource) new_resource).setURL(url);

        }
        return super.initResource(breq, new_resource);
    }
    
    public List validate(Resource resource) throws BuildingServerException {
        // Must check that we have a URL and it is longer than 0
        List errors = super.validate(resource);
        String url = ((BlogResource)resource).getBlogURL();
        if (url == null || url.length() == 0) {
            errors.add("You must specify a URL.");
        }
        return errors;
    }
    
    public boolean initResource( Resource original_resource, Resource new_resource )
    throws BuildingServerException {
    	
    	if ( !(new_resource instanceof BlogResource) )
    		throw new BuildingServerException( 
    		"Error: The wrong type of resource was created." );
    	
        BlogResource original = (BlogResource)original_resource;
        BlogResource copy = (BlogResource)new_resource;
        
        //set URL to get blog from:
        copy.setBlogURL( original.getBlogURL() );
        // 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.setBlogFlags( original.getBlogFlags() );
    	
    	return true;
    }

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

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

        BlogResource resource = (BlogResource) 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;
    }
}
