/*
    * 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.config;
  
  import org.waarp.common.command.ReplyCode;
  import org.waarp.common.command.exception.CommandAbstractException;
  import org.waarp.common.command.exception.Reply500Exception;
  import org.waarp.common.command.exception.Reply501Exception;
  import org.waarp.common.logging.WaarpLogger;
  import org.waarp.common.logging.WaarpLoggerFactory;
  import org.waarp.ftp.core.command.AbstractCommand;
  
  import java.io.File;
  
  /**
   * AUTHTUPDATE command: implements the command that will try to update the
   * authentications from the file given
   * as argument or the original one if no argument is given.<br>
   * Two optional arguments exist:<br>
   * - PURGE: empty first the current authentications before applying the
   * update<br>
   * - SAVE: save the final authentications on the original name given at
   * startup.<br>
   */
  public class AUTHUPDATE extends AbstractCommand {
    /**
     * Internal Logger
     */
    private static final WaarpLogger logger =
        WaarpLoggerFactory.getLogger(AUTHUPDATE.class);
  
    @Override
    public final void exec() throws CommandAbstractException {
      if (!getSession().getAuth().isAdmin()) {
        // not admin
        throw new Reply500Exception("Command Not Allowed");
      }
      String filename = null;
      boolean purge = false;
      boolean write = false;
      if (!hasArg()) {
        filename =
            ((FileBasedConfiguration) getConfiguration()).getAuthenticationFile();
      } else {
        final String[] authents = getArgs();
        for (final String authent : authents) {
          if ("PURGE".equalsIgnoreCase(authent)) {
            purge = true;
          } else if ("SAVE".equalsIgnoreCase(authent)) {
            write = true;
          } else if (filename == null) {
            filename = authent;
          }
        }
        if (filename == null) {
          filename =
              ((FileBasedConfiguration) getConfiguration()).getAuthenticationFile();
        }
        final File file = new File(filename);
        if (!file.canRead()) {
          throw new Reply501Exception(
              "Filename given as parameter is not found: " + filename);
        }
      }
      if (!((FileBasedConfiguration) getConfiguration()).initializeAuthent(
          filename, purge)) {
        throw new Reply501Exception("Filename given as parameter is not correct");
      }
      if (write &&
          !((FileBasedConfiguration) getConfiguration()).saveAuthenticationFile(
              ((FileBasedConfiguration) getConfiguration()).getAuthenticationFile())) {
        throw new Reply501Exception(
            "Update is done but Write operation is not correct");
      }
      logger.warn("Authentication was updated from " + filename);
      getSession().setReplyCode(ReplyCode.REPLY_200_COMMAND_OKAY,
                                "Authentication is updated");
    }
  
  }