/*
    * 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.openr66.context.task;
  
  import org.waarp.common.file.AbstractDir;
  import org.waarp.common.file.FileUtils;
  import org.waarp.common.logging.WaarpLogger;
  import org.waarp.common.logging.WaarpLoggerFactory;
  import org.waarp.common.utility.ParametersChecker;
  import org.waarp.common.utility.WaarpStringUtils;
  import org.waarp.openr66.context.R66Session;
  import org.waarp.openr66.context.task.exception.OpenR66RunnerException;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  
  /**
   * This task add 1 byte to empty file if the current file is empty (0
   * length).<br>
   * <br>
   * <p>
   * The task will be in error only if the file is of length 0 but cannot be
   * unzeroed.<br>
   * The content of PATH, if not empty, will be the content when unzeroed. If
   * empty, the 'blank' character will
   * be used.<br>
   * <p>
   * delay >= 1 will make a log using info level for 1, warn level for 2.
   */
  public class UnzeroedFileTask extends AbstractTask {
    /**
     * Internal Logger
     */
    private static final WaarpLogger logger =
        WaarpLoggerFactory.getLogger(UnzeroedFileTask.class);
  
    /**
     * @param argRule
     * @param delay
     * @param argTransfer
     * @param session
     */
    public UnzeroedFileTask(final String argRule, final int delay,
                            final String argTransfer, final R66Session session) {
      super(TaskType.UNZEROED, delay, argRule, argTransfer, session);
    }
  
    @Override
    public final void run() {
      final File currentFile = session.getFile().getTrueFile();
      final String toWrite = ParametersChecker.isEmpty(argRule)? " " : argRule;
      final String curpath =
          AbstractDir.normalizePath(currentFile.getAbsolutePath());
      if (currentFile.exists() && currentFile.length() == 0) {
        FileOutputStream out = null;
        try {
          out = new FileOutputStream(currentFile);
          out.write(toWrite.getBytes(WaarpStringUtils.UTF8));
          if (delay > 0) {
            if (delay > 1) {
              logger.warn("Unzeroed File: " + curpath + " from " + session);
            } else {
              logger.info("Unzeroed File: {} from {}", curpath, session);
            }
          }
          futureCompletion.setSuccess();
        } catch (final IOException e) {
          logger.error("Cannot unzeroed File: " + curpath + " from " + session);
          futureCompletion.setFailure(
              new OpenR66RunnerException("File not Unzeroed"));
        } finally {
          FileUtils.close(out);
        }
        return;
      }
      if (delay > 0) {
        if (delay > 1) {
          logger.warn(
              "Unzeroed File not applicable to " + curpath + " from " + session);
        } else {
          logger.info("Unzeroed File not applicable to {} from {}", curpath,
                     session);
       }
     }
     futureCompletion.setSuccess();
   }
 
 }