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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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 * as provided by Sun in the GPL Version 2 section of the License file that
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package com.sun.enterprise.cli.commands;

import com.sun.enterprise.cli.framework.*;

//jdk 
import java.util.Iterator;
import java.io.Reader;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * The help command will display the help text for all the commands and their
 * options
 */
public class HelpCommand extends Command 
{

  private static final int DEFAULT_PAGE_LENGTH = 50;
  private static final int NO_PAGE_LENGTH = -1;
  private static final String DEFAULT_HELP_PAGE = "help";

        /** Creates new HelpCommand */
  public HelpCommand() 
  {
  }

        /**
         * override abstract method validateOptions()
         */
    public boolean validateOptions() throws CommandValidationException
    {
        return true;
    }
    
	  /**
	   * Executes the command
	   * @throws CommandException
	   */
  public void runCommand() throws CommandException, CommandValidationException 
  {

	try {
	new More(getPageLength(),
        getSource(),
        getDestination(),
        getUserInput(),
        getUserOutput(),
        getQuitChar(),
        getPrompt());
	}
	catch (IOException ioe){
	  throw new CommandException(ioe);
	}
  }

  private String getCommandName(){
	return (operands.size() > 0
			? (String) getOperands().get(0)
			: DEFAULT_HELP_PAGE);
  }

  private Writer getDestination(){
	return new OutputStreamWriter(System.out);
  }

  private int getPageLength(){
      if ((getOption("isMultiMode")!=null &&
          getBooleanOption("isMultiMode")) &&
          (getOption("interactive")!=null &&
           getBooleanOption("interactive")) )
          return DEFAULT_PAGE_LENGTH;
      else
          return NO_PAGE_LENGTH;
  }

  private String getPrompt(){
      return getLocalizedString("ManpagePrompt");
  }
  
  private String getQuitChar(){
      return getLocalizedString("ManpageQuit");
  }

  private Reader getSource(){
	CLIManFileFinder c = new CLIManFileFinder();
	return c.getCommandManFile(getCommandName());
  }

  
  private Reader getUserInput(){
	return new InputStreamReader(System.in);
  }

  private Writer getUserOutput(){
	return new OutputStreamWriter(System.err);
  }

}