/*
    * 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.ftp.core.command.rfc4217;
  
  import org.waarp.common.command.ReplyCode;
  import org.waarp.common.command.exception.CommandAbstractException;
  import org.waarp.common.command.exception.Reply501Exception;
  import org.waarp.common.command.exception.Reply503Exception;
  import org.waarp.common.command.exception.Reply504Exception;
  import org.waarp.ftp.core.command.AbstractCommand;
  import org.waarp.ftp.core.command.FtpCommandCode;
  
  /**
   * PROT command accepting only C or P argument
   */
  public class PROT extends AbstractCommand {
  
    @Override
    public final void exec() throws CommandAbstractException {
      if (!getSession().isSslReady()) {
        // Not in SSL
        throw new Reply503Exception("Session not using SSL / TLS");
      }
      // First Check if any argument
      if (!hasArg()) {
        // Error since argument is needed
        throw new Reply501Exception("Missing Parameter: P or C");
      }
      final String[] types = getArgs();
      if ("P".equalsIgnoreCase(types[0])) {
        if (getSession().isDataSsl() &&
            getSession().getConfiguration().getFtpInternalConfiguration()
                        .isAcceptAuthProt()) {
          // Already SSL
          throw new Reply503Exception("Data already using SSL / TLS");
        }
        // Data will have SSL
        getSession().setDataSsl(true);
        getSession().setReplyCode(ReplyCode.REPLY_200_COMMAND_OKAY, null);
      } else if ("C".equalsIgnoreCase(types[0]) &&
                 !getSession().getConfiguration().getFtpInternalConfiguration()
                              .isAcceptAuthProt()) {
        if (!getSession().isDataSsl()) {
          // Not in SSL
          throw new Reply503Exception("Data already not using SSL / TLS");
        }
        getSession().setDataSsl(false);
        getSession().setReplyCode(ReplyCode.REPLY_200_COMMAND_OKAY, null);
      } else if (!getSession().getConfiguration().getFtpInternalConfiguration()
                              .isAcceptAuthProt()) {
        throw new Reply503Exception(
            "Data is using SSL / TLS and cannot be removed due to Implicit mode");
      } else {
        throw new Reply504Exception("Unknown Parameter: " + types[0]);
      }
      if (!getSession().getAuth().isIdentified()) {
        setExtraNextCommand(FtpCommandCode.AUTH);
      }
    }
  
  }