/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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.xwiki.officeimporter.internal.cleaner;

import java.io.Reader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.w3c.dom.Document;
import org.xwiki.component.annotation.Component;
import org.xwiki.xml.html.HTMLCleaner;
import org.xwiki.xml.html.HTMLCleanerConfiguration;
import org.xwiki.xml.html.filter.HTMLFilter;

/**
 * {@link HTMLCleaner} for cleaning HTML generated from an office server.
 * 
 * @version $Id: 6a1d4314372915b173afb416ecc6156ae9b87dc0 $
 * @since 1.8M1
 */
@Component
@Named("openoffice")
@Singleton
public class OfficeHTMLCleaner implements HTMLCleaner
{
    /**
     * Default html cleaner component used internally.
     */
    @Inject
    private HTMLCleaner defaultHtmlCleaner;

    /**
     * {@link HTMLFilter} for stripping various tags.
     */
    @Inject
    @Named("officeimporter/stripper")
    private HTMLFilter stripperFilter;

    /**
     * {@link HTMLFilter} filtering styles.
     */
    @Inject
    @Named("officeimporter/style")
    private HTMLFilter styleFilter;

    /**
     * {@link HTMLFilter} for stripping redundant tags.
     */
    @Inject
    @Named("officeimporter/redundancy")
    private HTMLFilter redundancyFilter;

    /**
     * {@link HTMLFilter} for cleaning empty paragraphs.
     */
    @Inject
    @Named("officeimporter/paragraph")
    private HTMLFilter paragraphFilter;

    /**
     * {@link HTMLFilter} for filtering image tags.
     */
    @Inject
    @Named("officeimporter/image")
    private HTMLFilter imageFilter;

    /**
     * {@link HTMLFilter} for filtering HTML anchors.
     */
    @Inject
    @Named("officeimporter/anchor")
    private HTMLFilter anchorFilter;

    /**
     * {@link HTMLFilter} for filtering lists.
     */
    @Inject
    @Named("officeimporter/list")
    private HTMLFilter listFilter;

    /**
     * {@link HTMLFilter} for filtering tables.
     */
    @Inject
    @Named("officeimporter/table")
    private HTMLFilter tableFilter;

    /**
     * {@link HTMLFilter} for filtering line breaks.
     */
    @Inject
    @Named("officeimporter/linebreak")
    private HTMLFilter lineBreakFilter;

    @Override
    public Document clean(Reader originalHtmlContent)
    {
    	// Add special parameters used in filters
        HTMLCleanerConfiguration configuration = getDefaultConfiguration();
        configuration.setParameters(Collections.singletonMap("filterStyles", "strict"));

        return clean(originalHtmlContent, configuration);
    }

    @Override
    public Document clean(Reader originalHtmlContent, HTMLCleanerConfiguration configuration)
    {
        return this.defaultHtmlCleaner.clean(originalHtmlContent, configuration);
    }

    @Override
    public HTMLCleanerConfiguration getDefaultConfiguration()
    {
        HTMLCleanerConfiguration configuration = this.defaultHtmlCleaner.getDefaultConfiguration();

        // Add office cleaning filters after the default filters.
        List<HTMLFilter> filters = new ArrayList<HTMLFilter>(configuration.getFilters());
        filters.addAll(Arrays.asList(
            this.stripperFilter,
            this.styleFilter,
            this.redundancyFilter,
            this.paragraphFilter,
            this.imageFilter,
//            this.anchorFilter,
            this.listFilter,
            this.tableFilter,
            this.lineBreakFilter));
        configuration.setFilters(filters);

        return configuration;
    }
}