/*
    * This file is part of Waarp Project (named also Waarp or GG).
    *
    *  Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
    *  tags. See the COPYRIGHT.txt in the distribution for a full listing of
    * individual contributors.
    *
    *  All Waarp Project 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 3 of the License, or (at your
   * option) any later version.
   *
   * Waarp 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
   * Waarp . If not, see <http://www.gnu.org/licenses/>.
   */
  package org.waarp.gateway.ftp.exec;
  
  import org.waarp.common.command.exception.CommandAbstractException;
  import org.waarp.common.command.exception.Reply421Exception;
  import org.waarp.common.exception.InvalidArgumentException;
  import org.waarp.common.future.WaarpFuture;
  import org.waarp.common.logging.SysErrLogger;
  import org.waarp.common.logging.WaarpLogger;
  import org.waarp.common.logging.WaarpLoggerFactory;
  import org.waarp.common.utility.ParametersChecker;
  import org.waarp.common.utility.WaarpSystemUtil;
  import org.waarp.common.utility.WaarpThreadFactory;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.TimeUnit;
  
  /**
   *
   */
  public class JavaExecutor extends AbstractExecutor {
    /**
     * Internal Logger
     */
    private static final WaarpLogger logger =
        WaarpLoggerFactory.getLogger(JavaExecutor.class);
    private final String[] args;
    private final WaarpFuture futureCompletion;
    private final long delay;
  
    /**
     * @param command
     * @param delay
     * @param futureCompletion
     */
    public JavaExecutor(final String command, final long delay,
                        final WaarpFuture futureCompletion) {
      args = BLANK.split(command);
      this.futureCompletion = futureCompletion;
      this.delay = delay;
    }
  
    @Override
    public final void run() throws CommandAbstractException {
      final String className = args[0];
      try {
        ParametersChecker.checkSanityString(className);
      } catch (final InvalidArgumentException e) {
        SysErrLogger.FAKE_LOGGER.ignoreLog(e);
        logger.error(
            "Status: " + e.getMessage() + "\n\t Exec in error with " + className);
        throw new Reply421Exception("Pre Exec command is not correctly executed");
      }
      final GatewayRunnable runnable;
      try {
        runnable =
            (GatewayRunnable) WaarpSystemUtil.newInstance(className);//NOSONAR
      } catch (final Exception e) {
        logger.error("ExecJava command is not available: " + className + ": {}",
                     e.getMessage());
        throw new Reply421Exception("Pre Exec command is not executable");
      }
      runnable.setArgs(true, useLocalExec, (int) delay, args);
      logger.debug("{} {}", className, runnable.getClass().getName());
      int status = -1;
      if (delay <= 0) {
        runnable.run();
        status = runnable.getFinalStatus();
      } else {
        final ExecutorService executorService = Executors.newSingleThreadExecutor(
            new WaarpThreadFactory("JavaExecutor"));
        executorService.execute(runnable);
        try {
          Thread.yield();
          executorService.shutdown();
          if (delay > 100) {
            if (!executorService.awaitTermination(delay, TimeUnit.MILLISECONDS)) {
              executorService.shutdownNow();
              logger.error("Exec is in Time Out");
              status = -1;
           } else {
             status = runnable.getFinalStatus();
           }
         } else {
           while (!executorService.awaitTermination(30, TimeUnit.SECONDS)) {
             // nothing
           }
           status = runnable.getFinalStatus();
         }
       } catch (final InterruptedException e) {//NOSONAR
         SysErrLogger.FAKE_LOGGER.ignoreLog(e);
         logger.error("Status: " + e.getMessage() + "\n\t Exec in error with " +
                      runnable);
         throw new Reply421Exception(
             "Pre Exec command is not correctly executed");
       }
     }
     if (status == 0) {
       futureCompletion.setSuccess();
       logger.info("Exec OK with {}", runnable);
     } else if (status == 1) {
       logger.warn("Exec in warning with " + runnable);
       futureCompletion.setSuccess();
     } else {
       logger.error("Status: " + status + " Exec in error with " + runnable);
       throw new Reply421Exception("Pre command executed in error");
     }
   }
 
 }