/*
 * Copyright (c) 2010, Manuel Mausz. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - The names of the authors may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

/*
 * Allows you to easily setup a interactive console application
 * Register commands in ctor and invoke run() afterwards
 * Reads line-based
 *
 * @author Manuel Mausz (0728348)
 */
public abstract class CommandInteractive
{
  private boolean stop = false;
  private boolean onecommand = false;
  private boolean ignoreempty = true;
  protected CommandHandler cmdHandler;

  /*--------------------------------------------------------------------------*/

  public CommandInteractive()
  {
    cmdHandler = new CommandHandler();
  }

  /*--------------------------------------------------------------------------*/

  public void setOneCommandMode(boolean mode)
  {
    onecommand = mode;
  }

  /*--------------------------------------------------------------------------*/

  public void setIgnoreEmptyMode(boolean mode)
  {
    ignoreempty = mode;
  }

  /*--------------------------------------------------------------------------*/

  public void stop()
  {
    stop = true;
  }

  /*--------------------------------------------------------------------------*/

  public void printPrompt()
  {}

  /*--------------------------------------------------------------------------*/

  public void run(InputStream in)
    throws IOException
  {
    BufferedReader stream = new BufferedReader(new InputStreamReader(in));
    String input;

    printPrompt();
    while(!stop && (input = stream.readLine()) != null)
    {
      if (!ignoreempty || input.length() > 0)
      {
        String[] pieces = input.split("\\s+");
        String[] args = new String[pieces.length - 1];
        System.arraycopy(pieces, 1, args, 0, pieces.length - 1);
        cmdHandler.call(pieces[0], args);
      }

      if (onecommand)
        stop();

      if (!stop)
        printPrompt();
    }
  }
}