/**************************************************************************
/* Command-line application for document indexing.
/*
/* Copyright (c) 2003-2004 by Bernhard Bablok (mail@bablokb.de)
/*
/* This library 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 of the License or
/* (at your option) any later version.
/*
/* This library 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 library; see the file COPYING.LESSER.  If not, write to
/* the Free Software Foundation Inc., 59 Temple Place - Suite 330,
/* Boston, MA  02111-1307 USA
/**************************************************************************/

package de.bablokb.luala.app;

import java.io.*;
import java.util.*;
import gnu.getopt.*;

import de.bablokb.luala.lib.*;

/**
   Command-line application for document indexing.

   @version $Revision: 1.8 $
   @author  $Author: bablokb $
*/

public class CmdIndexer {

  private String iIndexDir  = null;
  private String iSourceDir = null;
  private boolean iUpdate   = false;
  private boolean iDebug    = false;

  ////////////////////////////////////////////////////////////////////////////

  /**
     Display Usage information and exit.
  */

  private static void usage() {
    System.out.println("\nusage: java " + CmdIndexer.class.getName() + 
       " -s sourceDir -i indexDir [-udh]\n\n" +
       "valid options:\n" +
       "\t-s sourceDir    root-directory of files to index\n" +
       "\t                (or pass filenames to stdin)\n" +
       "\t-i indexDir     index-directory (required)\n" +
       "\t-u              update existing index\n" +
       "\t-d              display debug-output\n" +
       "\t-h              display usage-information and exit\n"
    );
    System.exit(1);
  }

   ////////////////////////////////////////////////////////////////////////////

  /**
     Parse commandline arguments.

     @param args The cmd-line arguments.
  */

  private void parseArguments(String[] args) {
    Getopt g = new Getopt(CmdSearcher.class.getName(),args, ":i:s:udh");
    int c;
    while ((c = g.getopt()) != -1) {
      switch(c)	{
      case 'i':
	iIndexDir = g.getOptarg();
	break;
      case 's':
	iSourceDir = g.getOptarg();
	break;
      case 'u':
	iUpdate = true;
	break;
      case 'd':
	iDebug = true;
	break;
      case 'h':
      case ':':
      case '?':
	usage();
	break;
      default:
	break;
      }
    }
  }

  ////////////////////////////////////////////////////////////////////////////

  /**
     Check arguments.
  */

  private void checkArguments() {
    if (iIndexDir == null)
      usage();
    try {
      if (iSourceDir == null && System.in.available() < 1)
	usage();
    } catch (IOException e) {
    }
    if (iSourceDir != null && ! new File(iSourceDir).isDirectory()) {
      System.err.println("error: " + iSourceDir + " is not a directory!");
      usage();
    }
    if (iUpdate && ! new File(iIndexDir).exists())
      iUpdate = false;
}

  ////////////////////////////////////////////////////////////////////////////

  /**
     Create or update the index.
  */

  private void createIndex() throws Exception {
    IndexEngine indexer = new IndexEngine(iIndexDir);
    indexer.setCreateFlag(!iUpdate);
    indexer.open();
    if (iSourceDir != null)
      indexer.indexDir(new File(iSourceDir));
    if (System.in.available() > 0) {      // working as a pipe
      BufferedReader reader = 
	new BufferedReader(new InputStreamReader(System.in));
      String line;
      while ((line = reader.readLine()) != null) {
	indexer.indexFile(line);
      }
      reader.close();
    }
    indexer.close();
  }

  ////////////////////////////////////////////////////////////////////////////

  /**
     Main-program. Currently, the program just supports two command-line
     arguments:
     <ol>
       <li>The source directory
       <li>The index directory
     </ol>
  */

  public static void main(String[] args) {
    CmdIndexer indexer = new CmdIndexer();
    try {
      indexer.parseArguments(args);
      indexer.checkArguments();
      indexer.createIndex();
    } catch (Exception e) {
      System.err.println("error: " + e.getMessage());
      if (indexer.iDebug)
	e.printStackTrace();
    }
  }
}