/*
    * 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.FileUtils;
  import org.waarp.common.logging.WaarpLogLevel;
  import org.waarp.common.logging.WaarpLogger;
  import org.waarp.common.logging.WaarpLoggerFactory;
  import org.waarp.common.utility.WaarpStringUtils;
  import org.waarp.openr66.context.ErrorCode;
  import org.waarp.openr66.context.R66Session;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.IOException;
  
  /**
   * This class is for logging or write to an external file some info:<br>
   * - if delay is 0, no echo at all will be done<br>
   * - if delay is 1, will echo some information in the normal log<br>
   * - if delay is 2, will echo some information in the file (last deduced
   * argument will be the full path for
   * the file output)<br>
   * - if delay is 3, will echo both in the normal log and in the file (last
   * deduced argument will be the full
   * path for the file output)<br>
   * <br>
   * If first word for logging is one of debug, info, warn, error, then the
   * corresponding level of log will be
   * used.
   */
  public class LogTask extends AbstractTask {
    private static final String SPACES = "     ";
    /**
     * Internal Logger
     */
    private static final WaarpLogger logger =
        WaarpLoggerFactory.getLogger(LogTask.class);
  
    /**
     * @param argRule
     * @param delay
     * @param argTransfer
     * @param session
     */
    public LogTask(final String argRule, final int delay,
                   final String argTransfer, final R66Session session) {
      super(TaskType.LOG, delay, argRule, argTransfer, session);
    }
  
    @Override
    public void run() {
      String finalValue = argRule;
      finalValue = getReplacedValue(finalValue, BLANK.split(argTransfer));
      final String tempValue = finalValue.toUpperCase();
      WaarpLogLevel finalLevel = WaarpLogLevel.WARN;
      for (final WaarpLogLevel level : WaarpLogLevel.values()) {
        if (tempValue.startsWith(level.name())) {
          finalLevel = level;
          break;
        }
      }
      switch (delay) {
        case 0:
          break;
        case 1:
          logger.log(finalLevel, finalValue + SPACES + session);
          break;
        case 3:
          logger.log(finalLevel, finalValue + SPACES + session);
          if (runFor2Or3(finalValue, finalLevel)) {
            return;
          }
          break;
        case 2:
          if (runFor2Or3(finalValue, finalLevel)) {
            return;
          }
          break;
        default:
      }
     futureCompletion.setSuccess();
   }
 
   private boolean runFor2Or3(final String finalValue,
                              final WaarpLogLevel finalLevel) {
     final String[] args = BLANK.split(finalValue);
     final String filename = args[args.length - 1];
     final File file = new File(filename);
     if (file.getParentFile() == null || file.exists() && !file.canWrite()) {
       // File cannot be written so revert to log
       session.getRunner().setErrorExecutionStatus(ErrorCode.Warning);
       if (delay == 2) {
         logger.log(finalLevel, finalValue + SPACES + session);
       }
       futureCompletion.setSuccess();
       return true;
     }
     final FileOutputStream outputStream;
     try {
       outputStream = new FileOutputStream(file, true);
     } catch (final FileNotFoundException e) {
       // File cannot be written so revert to log
       session.getRunner().setErrorExecutionStatus(ErrorCode.Warning);
       if (delay == 2) {
         logger.log(finalLevel, finalValue + SPACES + session);
       }
       futureCompletion.setSuccess();
       return true;
     }
     try {
       final int len = args.length - 1;
       for (int i = 0; i < len; i++) {
         outputStream.write(args[i].getBytes(WaarpStringUtils.UTF8));
         outputStream.write(' ');
       }
       outputStream.write(' ');
     } catch (final IOException e) {
       // File cannot be written so revert to log
       FileUtils.close(outputStream);
       if (!file.delete()) {
         logger.info("Cannot delete log file");
       }
       session.getRunner().setErrorExecutionStatus(ErrorCode.Warning);
       if (delay == 2) {
         logger.log(finalLevel, finalValue + SPACES + session);
       }
       futureCompletion.setSuccess();
       return true;
     }
     FileUtils.close(outputStream);
     return false;
   }
 
 }