// This Source Code is in the Public Domain per: http://litesoft.org/License.txt
package org.litesoft.versioning;

import java.io.*;

import org.litesoft.commonfoundation.typeutils.*;

import org.litesoft.util.*;

public class TimeStampVersion
{
    private static final String TO_LOCATE_PREFIX = " String ";
    private static final String TO_LOCATE_SUFFIX = " = ";

    public static final String VERSION = "2008/03/17 17:10:00";

    public static void main( String[] args )
            throws Exception
    {
        System.out.println( "TimeStampVersion vs " + VERSION );
        if ( args.length != 2 )
        {
            System.out.println( "" );
            System.out.println( "   Usage:" );
            System.out.println( "" );
            System.out.println( "       TimeStampVersion.jar filepath stringVariable" );
            System.out.println( "" );
            System.out.println( "           The parameters are:" );
            System.out.println( "               1) full file path" );
            System.out.println( "               2) 'String' variable name to set" );
            System.out.println( "" );
            System.out.println( "           -D parameters are:" );
            System.out.println( "               Template=FullFilePath" );
            System.out.println( "               Build=FullFilePath" );
            System.out.println( "               BuildNumber=ActualBuildNumber" );
            System.exit( 1 );
        }
        String fileName = args[0];
        String varName = args[1];
        File file = new File( fileName );
        String[] lines = loadSource( file );
        modify( lines, varName );
        FileUtils.storeTextFile( file, lines );
    }

    private static String[] loadSource( File pFile )
    {
        String template = System.getProperty( "Template" );
        if ( template != null )
        {
            template = template.trim();
            if ( template.length() != 0 )
            {
                pFile = new File( template );
            }
        }
        return FileUtils.loadTextFile( pFile );
    }

    private static void modify( String[] pLines, String pVarName )
            throws NoSuchFieldException
    {
        String toLocate = TO_LOCATE_PREFIX + pVarName + TO_LOCATE_SUFFIX;
        for ( int i = 0; i < pLines.length; i++ )
        {
            String line = pLines[i];
            int at = line.indexOf( toLocate );
            if ( at != -1 )
            {
                at += toLocate.length();
                String t = line.substring( at );
                if ( (t.length() > 2) && t.startsWith( "\"" ) && t.endsWith( "\";" ) )
                {
                    line = line.substring( 0, at + 1 ) + Timestamps.nowToYMDHMS() + getBuild() + "\";";
                    pLines[i] = line;
                    return;
                }
            }
        }
        throw new NoSuchFieldException( pVarName );
    }

    private static String getBuild()
    {
        String build = getBuildFromProperty() + getBuildFromFile();
        return (build.length() == 0) ? build : " Build: " + build;
    }

    private static String getBuildFromProperty()
    {
        return filterBuild( Strings.deNull( System.getProperty( "BuildNumber" ) ).trim() );
    }

    private static String getBuildFromFile()
    {
        String buildPath = Strings.deNull( System.getProperty( "Build" ) ).trim();
        if ( buildPath.length() != 0 )
        {
            String[] lines = FileUtils.loadTextFile( new File( buildPath ) );
            for ( String line : lines )
            {
                line = filterBuild( line.trim() );
                if ( line.length() != 0 )
                {
                    return line;
                }
            }
        }
        return "";
    }

    private static String filterBuild( String pLine )
    {
        int at = pLine.indexOf( ' ' );
        if ( at != -1 )
        {
            pLine = pLine.substring( 0, at );
        }
        at = pLine.indexOf( ':' );
        return (at == -1) ? pLine : pLine.substring( at + 1 );
    }
}