// Copyright 2004 Bradford Holcombe. All rights reserved.
package com.bradfordholcombe.JSPWiki.filters;

import com.ecyrd.jspwiki.WikiContext;
import com.ecyrd.jspwiki.filters.BasicPageFilter;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Replace strings of this pattern:
 * 
 * <pre>
 * <u>James A. Haught</u><a href="http://localhost:8080/SecularWiki/Edit.jsp?page=JamesA.Haught">?</a>
 * </pre>
 * 
 * with
 * 
 * <pre>
 * <a class="needed" href="http://localhost:8080/SecularWiki/Edit.jsp?page=JamesA.Haught">James A. Haught</a>
 * </pre>
 * 
 * @author bradfordholcombe
 */
public class EditLinkFilter extends BasicPageFilter
{
   /**
    * @see com.ecyrd.jspwiki.filters.PageFilter#postTranslate(com.ecyrd.jspwiki.WikiContext, java.lang.String)
    */
   public final String postTranslate( final WikiContext wikiContext, final String htmlContent )
   {
      wikiContext.getClass();

      Pattern pattern = Pattern.compile( "<u>([^<]+)</u><a href=\"([^\"]+)\">\\?</a>" );
      Matcher matcher = pattern.matcher( htmlContent );

      StringBuffer result = new StringBuffer();
      while( matcher.find() )
      {
         //System.out.println( matcher.group() );
         String replacement = "<a class=\"needed\" href=\"" + matcher.group( 2 ) + "\" alt=\"This page doesn't exist. Please fill it in!\" title=\"This page doesn't exist. Please fill it in!\">" + matcher.group( 1 ) + "</a>";
         //System.out.println( replacement );
         matcher.appendReplacement( result, replacement );
         //System.out.println();
      }
      matcher.appendTail( result );

      return result.toString();
   }

   /**
    * Test the filter.
    * 
    * @param args Command line arguments
    */
   public static void main( String[] args )
   {
      try
      {
         System.out.println( new File( "." ).getAbsolutePath() );
         BufferedReader in = new BufferedReader( new FileReader( "docs/source2.html" ) );
         StringBuffer input = new StringBuffer();
         String line = in.readLine();
         while( line != null )
         {
            input.append( line ).append( '\n' );
            line = in.readLine();
         }

         EditLinkFilter filter = new EditLinkFilter();
         String result = filter.postTranslate( null, input.toString() );
         System.out.println( result );
      }
      catch( IOException ioe )
      {
         System.out.println( ioe );
      }
   }
}