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/*
 * Copyright (c) 2006 Pyxis Technologies inc.
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; 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 com.greenpepper.html;

import com.greenpepper.util.StringUtil;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static java.lang.String.format;

/**
 * BulletListFilter class.
 *
 * @author oaouattara
 * @version $Id: $Id
 */
public class BulletListFilter implements HtmlContentFilter
{
    private static final String ELEMENT_BOUNDARY = "(?s)<\\s*(.*?)\\s*.*?>(.*?)<\\s*/\\s*\\1\\s*>";

    private List requiredInnerTags = new ArrayList();

    BulletListFilter(String ... requiredInnerTags) {
        for (String requiredInnerTag : requiredInnerTags) {
            this.requiredInnerTags.add(Pattern.compile(
                    format("<%1$s\\s*?.*?>.*?", requiredInnerTag), Pattern.CASE_INSENSITIVE
            ));
        }
    }

    /** {@inheritDoc} */
    public boolean handles(String tag)
    {
        return tag.equalsIgnoreCase( "li" );
    }

    /** {@inheritDoc} */
    public String process(String content)
    {
        // We will breakdown the inner elements with spans only if required
        if (shouldBreakTheContentDown(content)) {
            Matcher matcher = Pattern.compile(ELEMENT_BOUNDARY, Pattern.CASE_INSENSITIVE).matcher(content);

            StringBuilder sb = new StringBuilder();
            int startIndex, matchIndex;
            for (startIndex = 0; matcher.find(); startIndex = matcher.end()) {
                matchIndex = matcher.start();
                String preMatch = content.substring(startIndex, matchIndex);
                if (!StringUtil.isBlank(preMatch)) sb.append(span(preMatch));
                if (!StringUtil.isBlank(matcher.group(2))) sb.append(matcher.group());
            }
            String postMatch = content.substring(startIndex, content.length());
            if (!StringUtil.isBlank(postMatch)) sb.append(span(postMatch));

            return sb.toString();
        }
        return span(content);
    }

    private boolean shouldBreakTheContentDown(String content) {
        if (requiredInnerTags.isEmpty()) return true;
        for (Pattern requiredInnerTagPattern : requiredInnerTags) {
            if (requiredInnerTagPattern.matcher(content).find()) {
                return true;
            }
        }
        return false;
    }

    private String span(String content)
    {
        return format( "%s", content );
    }
}