/*
	This program 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 program 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 program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.ecyrd.jspwiki.filters;

import com.ecyrd.jspwiki.TextUtil;
import com.ecyrd.jspwiki.WikiContext;
import com.ecyrd.jspwiki.WikiEngine;
import com.ecyrd.jspwiki.auth.UserManager;
import com.ecyrd.jspwiki.auth.UserProfile;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Implements a stamp filter to easier stamp a comment with
 * one's name and the current date.
 * Replaces <pre>_menow</pre> with
 * <pre>''--[username] yyyy-mm-dd''</pre>.
 * Replaces <pre>menow_</pre> with
 * <pre>''yyyy-mm-dd [username]:''</pre>.
 * 
 * todo allow customization of name and date format via user preferences
 *
 *  @author Xan Gregg
 */
public class StampFilter
	extends BasicPageFilter
{
    public String preSave( WikiContext wikiContext, String content )
    {
		WikiEngine engine   = wikiContext.getEngine();
		UserManager mgr   = engine.getUserManager();
		
		UserProfile user = mgr.getUserProfile( wikiContext.getHttpRequest() );
		
		if (user == null)
			return content;	// bail out here, I've never seen this happen,
							// even for not logged-in users (whose name is their ip number)
		String name = user.getName();
		if (name.length() == 0 || Character.isDigit(name.charAt(0)))
			name = "unknown";	// convert ip number
		else
			name = "[" + name + "]";	// could check for existence, but might as well encourage personal pages
		
		Date today = new Date();
		SimpleDateFormat fmt = new SimpleDateFormat( "yyyy-MM-dd" );
			
		String source = "_menow";
		String replacement = "''--" + name + " " + fmt.format( today ) + "''";
		content = TextUtil.replaceString( content, source, replacement );

		source = "menow_";
		replacement = "''" + fmt.format( today ) + " " + name + ":''";
		content = TextUtil.replaceString( content, source, replacement );

        return content;
    }


}