/*
      This file is part of GNUnet
      Copyright (C) 2021 GNUnet e.V.

      GNUnet is free software: you can redistribute it and/or modify it
      under the terms of the GNU Affero General Public License as published
      by the Free Software Foundation, either version 3 of the License,
      or (at your option) any later version.

      GNUnet 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
      Affero General Public License for more details.

      You should have received a copy of the GNU Affero General Public License
      along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

/**
 * @file testing/testing_dhtu_cmd_send.c
 * @brief use DHTU to send a message
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_testing_ng_lib.h"


/**
 * State for the 'send' command.
 */
struct SendState
{

  /**
   * Function to call when done.
   */
  GNUNET_SCHEDULER_TaskCallback cont;

  /**
   * Closure for @e cont.
   */
  void *cont_cls;

  enum GNUNET_GenericReturnValue finished;
};


/**
 *
 *
 * @param cls a `struct SendState`
 */
static void
send_cleanup (void *cls)
{
  struct SendState *ss = cls;

  GNUNET_free (ss);
}


/**
 * Return trains of the ``send`` command.
 *
 * @param cls closure.
 * @param[out] ret result
 * @param trait name of the trait.
 * @param index index number of the object to offer.
 * @return #GNUNET_OK on success.
 *         #GNUNET_NO if no trait was found
 */
static enum GNUNET_GenericReturnValue
send_traits (void *cls,
             const void **ret,
             const char *trait,
             unsigned int index)
{
  return GNUNET_NO;
}


/**
 * Run the 'send' command.
 *
 * @param cls closure.
 * @param is interpreter state.
 */
static void
send_run (void *cls,
          struct GNUNET_TESTING_Interpreter *is)
{
  struct SendState *ss = cls;

#if 0
  other_cmd = GNUNET_TESTING_interpreter_lookup_command (ss->other_label);
  GNUNET_TESTING_get_trait_XXX (other_cmd,
                                &data);
#endif
  ss->finished = GNUNET_OK;
}


/**
 * This function checks the flag NetJailState#finished, if this cmd finished.
 *
 * @param cls a `struct SendState`
 * @param cont function to call upon completion, can be NULL
 * @param cont_cls closure for @a cont
 * @return
 *    #GNUNET_NO if the command is still running and @a cont will be called later
 *    #GNUNET_OK if the command completed successfully and @a cont was called
 *    #GNUNET_SYSERR if the operation @a cont was NOT called
 */
static enum GNUNET_GenericReturnValue
send_finish (void *cls,
             GNUNET_SCHEDULER_TaskCallback cont,
             void *cont_cls)
{
  struct SendState *ss = cls;

  switch (ss->finished)
  {
  case GNUNET_OK:
    cont (cont_cls);
    break;
  case GNUNET_SYSERR:
    GNUNET_break (0);
    break;
  case GNUNET_NO:
    if (NULL != ss->cont)
    {
      GNUNET_break (0);
      return GNUNET_SYSERR;
    }
    ss->cont = cont;
    ss->cont_cls = cont_cls;
    break;
  }
  return ss->finished;
}


/**
 * Create 'send' command.
 *
 * @param label name for command.
 * @return command.
 */
struct GNUNET_TESTING_Command
GNUNET_TESTING_DHTU_cmd_send (const char *label)
{
  struct SendState *ss;

  ss = GNUNET_new (struct SendState);

  {
    struct GNUNET_TESTING_Command cmd = {
      .cls = ss,
      .label = label,
      .run = &send_run,
      .finish = &send_finish,
      .cleanup = &send_cleanup,
      .traits = &send_traits
    };

    return cmd;
  }
}