/* ConsoleCallbackHandler.java -- console callback handler.
   Copyright (C) 2004  Free Software Foundation, Inc.

This file is a part of GNU Crypto.

GNU Crypto is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.

GNU Crypto 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
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Crypto; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give
you permission to link this library with independent modules to
produce an executable, regardless of the license terms of these
independent modules, and to copy and distribute the resulting
executable under terms of your choice, provided that you also meet,
for each linked independent module, the terms and conditions of the
license of that module.  An independent module is a module which is
not derived from or based on this library.  If you modify this
library, you may extend this exception to your version of the
library, but you are not obligated to do so.  If you do not wish to
do so, delete this exception statement from your version.  */


package gnu.crypto.auth.callback;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.PrintStream;

import java.util.Iterator;
import java.util.Locale;
import java.util.StringTokenizer;
import java.util.TreeSet;

import javax.security.auth.callback.ChoiceCallback;
import javax.security.auth.callback.ConfirmationCallback;
import javax.security.auth.callback.LanguageCallback;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.TextInputCallback;
import javax.security.auth.callback.TextOutputCallback;

/**
 * An implementation of {@link CallbackHandler} that reads and writes
 * information to and from <code>System.in</code> and <code>System.out</code>.
 */
public class ConsoleCallbackHandler extends AbstractCallbackHandler
{

  // Fields.
  // -------------------------------------------------------------------------

  private final PrintStream out;

  // Constructors.
  // -------------------------------------------------------------------------

  public ConsoleCallbackHandler()
  {
    this (System.out);
  }

  public ConsoleCallbackHandler (final PrintStream out)
  {
    this.out = out;
  }

  // Instance methods.
  // -------------------------------------------------------------------------

  protected void handleChoice(ChoiceCallback c) throws IOException
  {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    out.println(c.getPrompt());
    out.print('(');
    String[] choices = c.getChoices();
    for (int i = 0; i < choices.length; i++)
      {
        out.print(choices[i]);
        if (i != choices.length - 1)
          out.print(", ");
      }
    out.print(") ");
    if (c.getDefaultChoice() >= 0 && c.getDefaultChoice() < choices.length)
      {
        out.print('[');
        out.print(choices[c.getDefaultChoice()]);
        out.print("] ");
      }
    String reply = in.readLine();
    if (reply == null || reply.length() == 0)
      {
        c.setSelectedIndex(c.getDefaultChoice());
        return;
      }
    if (!c.allowMultipleSelections())
      {
        for (int i = 0; i < choices.length; i++)
          {
            if (reply.trim().equals(choices[i]))
              {
                c.setSelectedIndex(i);
                return;
              }
          }
        c.setSelectedIndex(c.getDefaultChoice());
      }
    else
      {
        TreeSet indices = new TreeSet();
        StringTokenizer tok = new StringTokenizer(reply, ",");
        String[] replies = new String[tok.countTokens()];
        int idx = 0;
        while (tok.hasMoreTokens())
          {
            replies[idx++] = tok.nextToken().trim();
          }
        for (int i = 0; i < choices.length; i++)
          for (int j = 0; j < replies.length; i++)
            {
              if (choices[i].equals(replies[j]))
                {
                  indices.add(new Integer(i));
                }
            }
        if (indices.size() == 0)
          c.setSelectedIndex(c.getDefaultChoice());
        else
          {
            int[] ii = new int[indices.size()];
            int i = 0;
            for (Iterator it = indices.iterator(); it.hasNext(); )
              ii[i++] = ((Integer) it.next()).intValue();
            c.setSelectedIndexes(ii);
          }
      }
  }

  protected void handleConfirmation(ConfirmationCallback c) throws IOException
  {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    if (c.getPrompt() != null)
      out.println(c.getPrompt());
    String[] choices = null;
    int[] values = null;
    switch (c.getOptionType())
      {
      case ConfirmationCallback.OK_CANCEL_OPTION:
        out.print(messages.getString("callback.okCancel"));
        choices = new String[] {
          messages.getString("callback.ok"),
          messages.getString("callback.cancel"),
          messages.getString("callback.shortOk"),
          messages.getString("callback.shortCancel")
        };
        values = new int[] {
          ConfirmationCallback.OK, ConfirmationCallback.CANCEL,
          ConfirmationCallback.OK, ConfirmationCallback.CANCEL
        };
        break;
      case ConfirmationCallback.YES_NO_CANCEL_OPTION:
        out.print(messages.getString("callback.yesNoCancel"));
        choices = new String[] {
          messages.getString("callback.yes"),
          messages.getString("callback.no"),
          messages.getString("callback.cancel"),
          messages.getString("callback.shortYes"),
          messages.getString("callback.shortNo"),
          messages.getString("callback.shortCancel")
        };
        values = new int[] {
          ConfirmationCallback.YES, ConfirmationCallback.NO,
          ConfirmationCallback.CANCEL, ConfirmationCallback.YES,
          ConfirmationCallback.NO, ConfirmationCallback.CANCEL
        };
        break;
      case ConfirmationCallback.YES_NO_OPTION:
        out.print(messages.getString("callback.yesNo"));
        choices = new String[] {
          messages.getString("callback.yes"),
          messages.getString("callback.no"),
          messages.getString("callback.shortYes"),
          messages.getString("callback.shortNo")
        };
        values = new int[] {
          ConfirmationCallback.YES, ConfirmationCallback.NO,
          ConfirmationCallback.YES, ConfirmationCallback.NO
        };
        break;
      case ConfirmationCallback.UNSPECIFIED_OPTION:
        choices = c.getOptions();
        values = new int[choices.length];
        for (int i = 0; i < values.length; i++)
          values[i] = i;
        out.print('(');
        for (int i = 0; i < choices.length; i++)
          {
            out.print(choices[i]);
            if (i != choices.length - 1)
              out.print(", ");
          }
        out.print(") [");
        out.print(choices[c.getDefaultOption()]);
        out.print("] ");
        break;
      default:
        throw new IllegalArgumentException();
      }
    String reply = in.readLine();
    if (reply == null)
      {
        c.setSelectedIndex(c.getDefaultOption());
        return;
      }
    reply = reply.trim();
    for (int i = 0; i < choices.length; i++)
      if (reply.equalsIgnoreCase(choices[i]))
        {
          c.setSelectedIndex(values[i]);
          return;
        }
    c.setSelectedIndex(c.getDefaultOption());
  }

  protected void handleLanguage(LanguageCallback c) throws IOException
  {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    out.println(messages.getString("callback.language"));
    String reply = null;
    reply = in.readLine();
    if (reply == null)
      {
        c.setLocale(Locale.getDefault());
      }
    else
      {
        c.setLocale(new Locale(reply.trim()));
      }
  }

  protected void handleName(NameCallback c) throws IOException
  {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    out.print(c.getPrompt());
    String name = in.readLine();
    if (name != null)
      c.setName(name.trim());
  }

  protected void handlePassword(PasswordCallback c) throws IOException
  {
    out.print(c.getPrompt());
    BufferedReader in =
      new BufferedReader(new InputStreamReader(System.in));
    String pass = in.readLine();
    c.setPassword(pass.toCharArray());
  }

  protected void handleTextInput(TextInputCallback c) throws IOException
  {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    out.print(c.getPrompt());
    String text = in.readLine();
    if (text != null)
      c.setText(text);
  }

  protected void handleTextOutput(TextOutputCallback c)
  {
    out.print(c.getMessage());
  }
}
