/*
  This file is part of TALER
  (C) 2018, 2020 Taler Systems SA

  TALER 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, or
  (at your option) any later version.

  TALER 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 TALER; see the file COPYING.  If not, see
  <http://www.gnu.org/licenses/>
*/
/**
 * @file testing/testing_api_cmd_check_keys.c
 * @brief Implementation of "check keys" test command.
 * @author Marcello Stanisci
 * @author Christian Grothoff
 */
#include "platform.h"
#include "taler_json_lib.h"
#include <gnunet/gnunet_curl_lib.h>
#include "taler_testing_lib.h"


/**
 * State for a "check keys" CMD.
 */
struct CheckKeysState
{
  /**
   * This number will instruct the CMD interpreter to
   * make sure that /keys was downloaded `generation` times
   * _before_ running the very CMD logic.
   */
  unsigned int generation;

  /**
   * If this value is true, then the "cherry
   * picking" facility is turned off; whole /keys is
   * downloaded.
   */
  bool pull_all_keys;

  /**
   * Label of a command to use to derive the "last_denom_issue" date to use.
   */
  const char *last_denom_date_ref;

  /**
   * Last denomination date we received when doing this request.
   */
  struct GNUNET_TIME_Absolute my_denom_date;
};


/**
 * Run the "check keys" command.
 *
 * @param cls closure.
 * @param cmd the command currently being executed.
 * @param is the interpreter state.
 */
static void
check_keys_run (void *cls,
                const struct TALER_TESTING_Command *cmd,
                struct TALER_TESTING_Interpreter *is)
{
  struct CheckKeysState *cks = cls;

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "cmd `%s' (ip: %u), key generation: %d\n",
              cmd->label,
              is->ip,
              is->key_generation);
  if (is->key_generation < cks->generation)
  {
    struct GNUNET_TIME_Absolute rdate;

    is->working = GNUNET_NO;
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Triggering GET /keys, cmd `%s'\n",
                cmd->label);
    if (NULL != cks->last_denom_date_ref)
    {
      if (0 == strcmp ("zero",
                       cks->last_denom_date_ref))
      {
        TALER_LOG_DEBUG ("Forcing last_denom_date URL argument set to zero\n");
        TALER_EXCHANGE_set_last_denom (is->exchange,
                                       GNUNET_TIME_UNIT_ZERO_ABS);
      }
      else
      {
        const struct GNUNET_TIME_Absolute *last_denom_date;
        const struct TALER_TESTING_Command *ref;

        ref = TALER_TESTING_interpreter_lookup_command (is,
                                                        cks->last_denom_date_ref);
        if (NULL == ref)
        {
          GNUNET_break (0);
          TALER_TESTING_interpreter_fail (is);
          return;
        }
        if (GNUNET_OK !=
            TALER_TESTING_get_trait_absolute_time (ref,
                                                   0,
                                                   &last_denom_date))
        {
          GNUNET_break (0);
          TALER_TESTING_interpreter_fail (is);
          return;
        }

        TALER_LOG_DEBUG ("Forcing last_denom_date URL argument\n");
        TALER_EXCHANGE_set_last_denom (is->exchange,
                                       *last_denom_date);
      }
    }

    rdate = TALER_EXCHANGE_check_keys_current (
      is->exchange,
      cks->pull_all_keys
      ? TALER_EXCHANGE_CKF_FORCE_ALL_NOW
      : TALER_EXCHANGE_CKF_FORCE_DOWNLOAD);
    /* Redownload /keys.  */
    GNUNET_break (0 ==
                  rdate.abs_value_us);
    return;
  }
  {
    const struct TALER_EXCHANGE_Keys *keys;

    keys = TALER_EXCHANGE_get_keys (is->exchange);
    if (NULL == keys)
    {
      GNUNET_break (0);
      TALER_TESTING_interpreter_fail (is);
      return;
    }
    cks->my_denom_date = keys->last_denom_issue_date;
  }
  TALER_TESTING_interpreter_next (is);
}


/**
 * Cleanup the state.
 *
 * @param cls closure.
 * @param cmd the command which is being cleaned up.
 */
static void
check_keys_cleanup (void *cls,
                    const struct TALER_TESTING_Command *cmd)
{
  struct CheckKeysState *cks = cls;

  (void) cmd;
  GNUNET_free (cks);
}


/**
 * Offer internal data to a "check_keys" CMD state to other
 * commands.
 *
 * @param cls closure
 * @param[out] ret result (could be anything)
 * @param trait name of the trait
 * @param index index number of the object to offer.
 * @return #GNUNET_OK on success
 */
static int
check_keys_traits (void *cls,
                   const void **ret,
                   const char *trait,
                   unsigned int index)
{
  struct CheckKeysState *cks = cls;
  struct TALER_TESTING_Trait traits[] = {
    /* history entry MUST be first due to response code logic below! */
    TALER_TESTING_make_trait_absolute_time (0,
                                            &cks->my_denom_date),
    TALER_TESTING_trait_end ()
  };

  return TALER_TESTING_get_trait (traits,
                                  ret,
                                  trait,
                                  index);
}


struct TALER_TESTING_Command
TALER_TESTING_cmd_check_keys (const char *label,
                              unsigned int generation)
{
  struct CheckKeysState *cks;

  cks = GNUNET_new (struct CheckKeysState);
  cks->generation = generation;
  {
    struct TALER_TESTING_Command cmd = {
      .cls = cks,
      .label = label,
      .run = &check_keys_run,
      .cleanup = &check_keys_cleanup,
      .traits = &check_keys_traits
    };

    return cmd;
  }
}


struct TALER_TESTING_Command
TALER_TESTING_cmd_check_keys_pull_all_keys (const char *label,
                                            unsigned int generation)
{
  struct TALER_TESTING_Command cmd
    = TALER_TESTING_cmd_check_keys (label,
                                    generation);
  struct CheckKeysState *cks = cmd.cls;

  cks->pull_all_keys = true;
  return cmd;
}


struct TALER_TESTING_Command
TALER_TESTING_cmd_check_keys_with_last_denom (
  const char *label,
  unsigned int generation,
  const char *last_denom_date_ref)
{
  struct TALER_TESTING_Command cmd
    = TALER_TESTING_cmd_check_keys (label,
                                    generation);
  struct CheckKeysState *cks = cmd.cls;
  cks->last_denom_date_ref = last_denom_date_ref;
  return cmd;
}


/* end of testing_api_cmd_check_keys.c */