/**
 * Copyright (C) 2004  Free Software Foundation, Inc.
 *
 * Author: Oliver Hitz
 *
 * This file is part of GNU Libidn.
 *
 * 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 2.1 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; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

import gnu.inet.encoding.IDNA;
import gnu.inet.encoding.IDNAException;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.PrintStream;
import java.util.StringTokenizer;

public class TestIDNA
{
  final static int STATE_SCAN = 0;
  final static int STATE_INPUT = 1;

  public static void usage()
  {
    System.err.println("Usage: "+TestIDNA.class.toString()+" [-a|-u string] [-t]");
    System.err.println("       -a string: apply toASCII(string)");
    System.err.println("       -u string: apply toUnicode(string)");
    System.err.println("       -t: automatic test using draft-josefsson-idn-test-vectors.html");
    System.exit(1);
  }

  public static void main(String[] args)
    throws Exception
  {
    if (args.length == 2) {
      if (args[0].equals("-u")) {
	try {
	  System.out.println("Input: "+args[1]);
	  System.out.println("Output: "+IDNA.toASCII(args[1]));
	} catch (IDNAException e) {
	  System.out.println(e);
	}
      } else if (args[0].equals("-a")) {
	System.out.println("Input: "+args[1]);
	System.out.println("Output: "+IDNA.toUnicode(args[1]));
      } else {
	usage();
      }
    } else if (args.length == 1 && args[0].equals("-t")) {
      File f = new File("draft-josefsson-idn-test-vectors.html");
      if (!f.exists()) {
	System.err.println("Unable to find draft-josefsson-idn-test-vectors.html.");
	System.err.println("Please download the latest version of this file from:");
	System.err.println("http://www.gnu.org/software/libidn/");
	System.exit(1);
      }

      BufferedReader r = new BufferedReader(new FileReader(f));
      int state = STATE_SCAN;

      StringBuffer input = new StringBuffer();
      String out;

      while (true) {
	String l = r.readLine();
	if (null == l) {
	  break;
	}

	switch (state) {
	case STATE_SCAN:
	  if (l.startsWith("input (length ")) {
	    state = STATE_INPUT;
	    input = new StringBuffer();
	  }
	  break;
	case STATE_INPUT:
	  if (l.equals("")) {
	    // Empty line (before "out:")
	  } else if (l.startsWith("out: ")) {
	    out = l.substring(5).trim();
	    
	    try {
	      String ascii = IDNA.toASCII(input.toString());
	      if (ascii.equals(out)) {
		// Ok
	      } else {
		System.err.println("Error detected:");
		System.err.println("  Input: "+input);
		System.err.println("  toASCII returned: "+ascii);
		System.err.println("  expected result: "+out);
		System.exit(1);
	      }
	    } catch (IDNAException e) {
	      System.out.println(" exception thrown ("+e+")");
	    }
	    
	    state = STATE_SCAN;
	  } else {
	    StringTokenizer tok = new StringTokenizer(l.trim(), " ");
	    while (tok.hasMoreTokens()) {
	      String t = tok.nextToken();
	      if (t.startsWith("U+")) {
		char u = (char) Integer.parseInt(t.substring(2, 6), 16);
		input.append(u);
	      } else {
		System.err.println("Unknown token: "+t);
	      }
	    }
	  }
	  break;
	}
      }
      
      System.out.println("No errors detected!");
    } else {
      usage();
    }
  }
}