package org.apache.maven.doxia.module.confluence.parser.list;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import org.apache.maven.doxia.util.ByLineSource;
import org.apache.maven.doxia.module.confluence.ConfluenceMarkup;
import org.apache.maven.doxia.module.confluence.parser.Block;
import org.apache.maven.doxia.module.confluence.parser.BlockParser;
import org.apache.maven.doxia.parser.ParseException;

/**
 * @author <a href="mailto:jason@maven.org">Jason van Zyl</a>
 * @version $Id: ListBlockParser.java 709605 2008-10-31 23:57:03Z hboutemy $
 */
public class ListBlockParser implements BlockParser {
	public static final int BULLETED_LIST = 0;

	public static final int NUMBERED_LIST = 1;

	/** {@inheritDoc} */
	public boolean accept(String line, ByLineSource source) {
		if (isList(line)) {
			return true;
		}

		return false;
	}

	/** {@inheritDoc} */
	public Block visit(String line, ByLineSource source) throws ParseException {
		TreeListBuilder treeListBuilder = new TreeListBuilder();

		StringBuffer text = new StringBuffer();

		do {
			if (line.trim().length() == 0) {
				break;
			}

			if (text.length() > 0 && isList(line)) {
				String item = text.toString();
				treeListBuilder.feedEntry(getPrefix(item), item.substring(
						getPrefix(item).length()).trim());
				text.setLength(0);
			}

			if (text.length() == 0) {
				text.append(line.trim());
			} else {
				text.append(ConfluenceMarkup.SPACE + line.trim());
			}

		} while ((line = source.getNextLine()) != null);

		if (text.length() > 0) {
			String item = text.toString();
			treeListBuilder.feedEntry(getPrefix(item), item.substring(
					getPrefix(item).length()).trim());
		}

		return treeListBuilder.getBlock();
	}

	private boolean isList(String line) {
		line = line.trim();

		char bold = ConfluenceMarkup.BOLD_START_MARKUP.charAt(0);
		char dash = ConfluenceMarkup.DASH.charAt(0);
		char hash = ConfluenceMarkup.HASH_MARKUP.charAt(0);

		if (line.startsWith(ConfluenceMarkup.BOLD_START_MARKUP)
				|| line.startsWith(ConfluenceMarkup.DASH)
				|| line.startsWith(ConfluenceMarkup.HASH_MARKUP)) {
			String temp = line.substring(1);
			while (temp.charAt(0) == bold || temp.charAt(0) == dash
					|| temp.charAt(0) == hash)
				temp = temp.substring(1);
			if (temp.charAt(0) == ConfluenceMarkup.SPACE.charAt(0))
				return true;
		}

		return false;
	}

	private String getPrefix(String line) {
		int i = 0;
		while (i < line.length()
				&& (line.charAt(i) == ConfluenceMarkup.DASH.toCharArray()[0]
						|| line.charAt(i) == ConfluenceMarkup.BOLD_START_MARKUP
								.toCharArray()[0] || line.charAt(i) == ConfluenceMarkup.HASH_MARKUP
						.toCharArray()[0]))
			i++;
		return line.substring(0, i);
	}
}