/**
*******************************************************************************
* Copyright (C) 2005-2006, International Business Machines Corporation and    *
* others. All Rights Reserved.                                                *
*******************************************************************************
*/
package com.ibm.icu.dev.tool.index;

import java.io.*;
import java.text.*;
import java.util.*;

public class IndexGenerator {
    
    private final static String stoplist = ",char.res,CurrencyData.res,invuca.res,line.res,line_th.res,pnames.res,res_index.res,sent.res,title.res,ucadata.res,ucase.res,uidna.res,unames.res,unorm.res,uprops.res,word.res,word_ja.res,word_POSIX.res,word_th.res";

    public static void main(String[] args) {
	if (args.length < 1) {
	    usage("too few arguments");
	}

	File inDir = new File(args[0]);
	if (!inDir.isDirectory() || !inDir.exists()) {
	    usage("first argument '" + inDir + "' must be existing directory");
	}

	File outDir = inDir;
	if (args.length > 1) {
	    outDir = new File(args[1]);
	    if (!outDir.isDirectory() || !outDir.exists()) {
		usage("second argument must be existing directory");
	    }
	}

	Set names = new TreeSet();
	File[] files = inDir.listFiles();
	if (files != null) {
	    for (int i = 0; i < files.length; i++){
		if (!files[i].isDirectory()) {
		    String name = "," + files[i].getName(); // add ',' to get exact match
		    if (name.endsWith(".res") && stoplist.indexOf(name) == -1) {
			names.add(name.substring(1, name.lastIndexOf('.'))); // 1 to trim off ','
		    }
		}
	    }
	}
	    
	DateFormat fmt = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG, Locale.US);
	DateFormat copyfmt = new SimpleDateFormat("'# Copyright (C) 'yyyy' IBM Inc.  All Rights Reserved.'");

	try {
	    File outFile = new File(outDir, "res_index.txt");
	    PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(outFile)));
	    Date now = new Date();
	    pw.println("# Generated by " + IndexGenerator.class.getName() + " on " + fmt.format(now));
	    pw.println("# from contents of " + inDir.getCanonicalPath());
	    pw.println(copyfmt.format(now));
	    Iterator i = names.iterator();
	    while (i.hasNext()) {
		pw.println(i.next());
	    }
	    int count = names.size();
	    pw.println("# Found " + count + " files");
	    pw.println("# End of file");
	    if (count == 0) {
		System.err.println("Warning: matched no files");
	    } 
	    pw.close();
	}
	catch (IOException e) {
	    usage(e.getMessage());
	}
    }

    private static void usage(String msg) {
	if (msg != null) {
	    System.err.println("Error: " + msg);
	}
	System.out.println("Usage: IndexGenerator inDir outDir");
	System.out.println("  inDir is an existing directory whose locale-based resources are to be enumerated");
	System.out.println("  outDir is an existing directory in which the res_index.txt file will be placed");
	throw new IllegalStateException("Usage");
    }
}