/*
 * [FindObsoleteRFCs.java]
 *
 * Summary: Find obsolete RFCs.
 *
 * Copyright: (c) 2012-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  1.0 2012-12-23 initial release
 */
package com.mindprod.repair;

import com.mindprod.common18.EIO;
import com.mindprod.csv.CSVWriter;
import com.mindprod.hunkio.HunkIO;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Find obsolete RFCs.
 * <p/>
 * Manually update com.mindprod.htmlmacros.RFC.MAX_RFC
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0 2012-12-24 initial release
 * @since 2012-12-24
 */
public class FindObsoleteRFCs
    {
    private static final Pattern pattern = Pattern.compile(
            "<A HREF=\"/rfcs/rfc\\d+\\.html\">" +
            "RFC (\\d+)</A>|" +
            "Obsoleted by: <A HREF=\"/rfcs/rfc\\d+\\.html\">" +
            "RFC(\\d+)</A>", Pattern.CASE_INSENSITIVE
    );

    /**
     * Use findobsoleterfcs.btm to:
     * download http://www.faqs.org/rfcs/rfc-obsolete.html E:/com/mindprod/repair/obsoleterfcs.html
     * first.  when done, copy E:/com/mindprod/repair/obsoleterfcs.csv to embellishments.
     * csvsort obsoleterfcs.csv 0n+
     * <p/>
     * Update upper limit in macro RFC
     *
     * @param args not used
     *
     * @throws IOException
     */
    public static void main( final String[] args ) throws IOException
        {
        final String contents = HunkIO.readEntireFile( new File( "E:/com/mindprod/repair/obsoleterfcs.html" ) );
        final File obs = new File( "E:/com/mindprod/repair/obsoleterfcs.csv" );
        final PrintWriter prw = EIO.getPrintWriter( obs, 24 * 1024, EIO.UTF8 );
        final CSVWriter w = new CSVWriter( prw, -1 /* quote level */, ',', '\"', '#', true );
        final Matcher m = pattern.matcher( contents );  // Matchers are used both for matching and finding.
        String base = "unknown";
        String replace;
        while ( m.find() )
            {
            final int gc = m.groupCount();
            assert gc == 2;
            final String first = m.group( 1 );
            if ( first != null )
                {
                base = first;
                }
            else
                {
                replace = m.group( 2 );
                w.put( Integer.parseInt( base ) );
                w.put( Integer.parseInt( replace ) );
                w.nl();
                }
            }
        w.close();
        }
    }