/*
 * [PruneFoot.java]
 *
 * Summary: Remove iframe reference from the footer of an HTML page generated with macro Foot.
 *
 * Copyright: (c) 2009-2017 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 2009-06-02 initial version
 */
package com.mindprod.repair;

import com.mindprod.commandline.CommandLine;
import com.mindprod.common18.EIO;
import com.mindprod.filter.AllButSVNDirectoriesFilter;
import com.mindprod.filter.ExtensionListFilter;
import com.mindprod.hunkio.HunkIO;

import java.io.File;
import java.io.IOException;

import static java.lang.System.*;

/**
 * Remove iframe reference from the footer of an HTML page generated with macro Foot.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0 2009-06-02 initial version
 * @since 2009-06-02
 */
public class PruneFoot
    {
    private static final String END_MARKER = "</iframe>";

    /**
     * we replace link to separate footer with some canned inline text
     */
    private static final String NON_MIL = "The information on this page is for non-military use only.<br>Military use" +
                                          " includes use by defence contractors.";

    private static final String START_MARKER = "<iframe src=\"foot/";

    public static void main( String[] args )
        {
        CommandLine commandLine = new CommandLine( args,
                new AllButSVNDirectoriesFilter(),
                new ExtensionListFilter( "html" ) );
        for ( File file : commandLine )
            {
            try
                {
                final String big = HunkIO.readEntireFile( file );
                if ( big == null )
                    {
                    err.println( "Problems reading file " + EIO.getCanOrAbsPath( file ) );
                    err.println( "File left as is." );
                    continue;
                    }
                final int start = big.indexOf( START_MARKER );
                if ( start < 0 )
                    {
                    err.println( "Missing " + START_MARKER + " in " + EIO.getCanOrAbsPath( file ) );
                    err.println( "File left as is." );
                    continue;
                    }
                int end = big.indexOf( END_MARKER, start + START_MARKER.length() );
                if ( end < 0 )
                    {
                    err.println( "Missing " + END_MARKER + " in " + EIO.getCanOrAbsPath( file ) );
                    err.println( "File left as is." );
                    continue;
                    }
                end += END_MARKER.length();
                // remonve a chunk like this:
                // <iframe src="foot/converter.html" height="200" width="600" scrolling="no" frameborder="0"></iframe>
                final int estSize = big.length() - ( end - start ) + NON_MIL.length();
                StringBuilder gc = new StringBuilder( estSize );
                gc.append( big.substring( 0, start ) );
                gc.append( NON_MIL );
                gc.append( big.substring( end ) );
                assert estSize == gc.length() : "bad size estimate";
                HunkIO.writeEntireFile( file, gc.toString() );
                }
            catch ( IOException e )
                {
                e.printStackTrace( err );
                err.println();
                System.exit( 1 );
                }
            }
        }
    }