/**
 * $Id$
 * $Date$
 *
 */

package org.xmlsh.sh.shell;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.xmlsh.sh.core.ICommandExpr;
import org.xmlsh.sh.core.IExpression;
import org.xmlsh.util.Util;
import org.xmlsh.xpath.ThreadLocalShell;

public class ShellThread extends Thread implements Closeable {

  @SuppressWarnings("unused")
  private static Logger mLogger = LogManager.getLogger(ShellThread.class);

  private volatile Shell mShell;
  private ICommandExpr mCommand;
  private File mIniitalCD;

  public ShellThread(ThreadGroup threadGroup, Shell shell, String name,
      ICommandExpr cmd) {
    super(threadGroup == null ? shell.getThreadGroup() : threadGroup,
        simpleName(name, cmd));
    mShell = shell;
    mCommand = cmd;
    mIniitalCD = shell.getCurdir();

  }

  private static String simpleName(String name, IExpression cmd) {
    if(Util.isBlank(name))
      name = cmd.getName();
    if(Util.isBlank(name))
      name = "<shell thread>";
    return name;

  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Thread#run()
   */
  @Override
  public void run() {

    try {

      Shell shell = null;
      synchronized(this) {
        shell = mShell;
        if(shell == null) {
          mLogger.error("Shell is closed before run(): " + describe());
          return;
        }
      }

      ThreadLocalShell.set(shell);
      shell.setCurdir(mIniitalCD); // Populate the current directory in this
                                   // thread
      mCommand.exec(shell);

    } catch (Exception e) {
      // mShell.printErr("Exception running: " + mCommand.toString(true) + "\n"
      // + e.toString() );
      mLogger.error("Exception running command: " + mCommand.describe(false),
          e);

    } finally {
      try {
        close();
      } catch (IOException e) {
        mLogger.error("Exception closing self: " + describe(), e);

      }

    }

  }

  public IExpression getCommand() {
    return mCommand;
  }

  public Shell getShell() {
    return mShell;
  }

  // Attempt to nicely close this job
  @Override
  public void close() throws IOException {
    if(mShell == null)
      return;
    synchronized(this) {
      if(mShell == null)
        return;
      ThreadLocalShell.set(null);
      mShell.close();
      mShell = null;
    }
  }

  public String describe() {
    return "[" + getId() + "] : " + getName();
  }

  /*
   * Attempt to force a shutdown of this shell
   * Intended to be called from a external thread to try to force the shell to
   * quit
   */
  public boolean shutdown(boolean force, long waitTime) throws IOException {
    Shell sh = mShell;
    if(sh == null)
      return true;

    sh.shutdown(force, waitTime);
    Thread.yield();
    return mShell == null;
  }

}
//
//
// Copyright (C) 2008-2014 David A. Lee.
//
// The contents of this file are subject to the "Simplified BSD License" (the
// "License");
// you may not use this file except in compliance with the License. You may
// obtain a copy of the
// License at http://www.opensource.org/licenses/bsd-license.php
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is David A. Lee
//
// Portions created by (your name) are Copyright (C) (your legal entity). All
// Rights Reserved.
//
// Contributor(s): none.
//