/*
  This file is part of TALER
  Copyright (C) 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 lib/testing_api_cmd_post_reserves.c
 * @brief command to test POST /reserves
 * @author Jonathan Buchanan
 */
#include "platform.h"
#include <taler/taler_exchange_service.h>
#include <taler/taler_testing_lib.h>
#include "taler_merchant_service.h"
#include "taler_merchant_testing_lib.h"

/**
 * State of a "POST /reserves" CMD.
 */
struct PostReservesState
{
  /**
   * Handle for a "POST /reserves" request.
   */
  struct TALER_MERCHANT_PostReservesHandle *prh;

  /**
   * The interpreter state.
   */
  struct TALER_TESTING_Interpreter *is;

  /**
   * Base URL of the merchant
   */
  const char *merchant_url;

  /**
   * Base URL of the exchange.
   */
  const char *exchange_url;

  /**
   * Wire method for the reserve.
   */
  const char *wire_method;

  /**
   * The initial balance of the reserve.
   */
  struct TALER_Amount initial_balance;

  /**
   * Expected HTTP response code.
   */
  unsigned int http_status;

  /**
   * Public key assigned to the reserve
   */
  struct TALER_ReservePublicKeyP reserve_pub;
};


/**
 * Callbacks of this type are used to work the result of submitting a
 * POST /reserves request to a merchant
 *
 * @param cls closure
 * @param hr HTTP response details
 * @param reserve_pub public key of the created reserve, NULL on error
 * @param payto_uri where to make the payment to for filling the reserve, NULL on error
 */
static void
post_reserves_cb (void *cls,
                  const struct TALER_MERCHANT_HttpResponse *hr,
                  const struct TALER_ReservePublicKeyP *reserve_pub,
                  const char *payto_uri)
{
  struct PostReservesState *prs = cls;

  prs->prh = NULL;
  if (prs->http_status != hr->http_status)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u (%d) to command %s\n",
                hr->http_status,
                (int) hr->ec,
                TALER_TESTING_interpreter_get_current_label (prs->is));
    TALER_TESTING_interpreter_fail (prs->is);
    return;
  }
  switch (hr->http_status)
  {
  case MHD_HTTP_NO_CONTENT:
    break;
  case MHD_HTTP_CONFLICT:
    break;
  case MHD_HTTP_OK:
    break;
  // FIXME: add other legitimate states here...
  default:
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Unhandled HTTP status (%d).\n",
                hr->http_status);
  }
  prs->reserve_pub = *reserve_pub;
  TALER_TESTING_interpreter_next (prs->is);
}


/**
 * Offers information from the POST /reserves CMD state to other
 * commands.
 *
 * @param cls closure
 * @param ret[out] result (could be anything)
 * @param trait name of the trait
 * @param index index number of the object to extract.
 * @return #GNUNET_OK on success
 */
static int
post_reserves_traits (void *cls,
                      const void **ret,
                      const char *trait,
                      unsigned int index)
{
  struct PostReservesState *prs = cls;
  struct TALER_TESTING_Trait traits[] = {
    TALER_TESTING_make_trait_reserve_pub (0, &prs->reserve_pub),
    TALER_TESTING_make_trait_amount_obj (0, &prs->initial_balance),
    TALER_TESTING_trait_end (),
  };

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


/**
 * Run the "POST /reserves" CMD.
 *
 * @param cls closure.
 * @param cmd command being run now.
 * @param is interpreter state.
 */
static void
post_reserves_run (void *cls,
                   const struct TALER_TESTING_Command *cmd,
                   struct TALER_TESTING_Interpreter *is)
{
  struct PostReservesState *prs = cls;

  prs->is = is;
  prs->prh = TALER_MERCHANT_reserves_post (is->ctx,
                                           prs->merchant_url,
                                           &prs->initial_balance,
                                           prs->exchange_url,
                                           prs->wire_method,
                                           &post_reserves_cb,
                                           prs);
  GNUNET_assert (NULL != prs->prh);
}


/**
 * Run the fake "POST /reserves" CMD.
 *
 * @param cls closure.
 * @param cmd command being run now.
 * @param is interpreter state.
 */
static void
post_reserves_fake_run (void *cls,
                        const struct TALER_TESTING_Command *cmd,
                        struct TALER_TESTING_Interpreter *is)
{
  struct PostReservesState *prs = cls;
  struct TALER_ReservePrivateKeyP reserve_priv;

  prs->is = is;
  GNUNET_CRYPTO_eddsa_key_create (&reserve_priv.eddsa_priv);
  GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv.eddsa_priv,
                                      &prs->reserve_pub.eddsa_pub);

  GNUNET_assert (GNUNET_OK == TALER_string_to_amount ("EUR:100.00",
                                                      &prs->initial_balance));
  TALER_TESTING_interpreter_next (prs->is);
}


/**
 * Free the state of a "POST /reserves" CMD, and possibly
 * cancel a pending operation thereof.
 *
 * @param cls closure.
 * @param cmd command being run.
 */
static void
post_reserves_cleanup (void *cls,
                       const struct TALER_TESTING_Command *cmd)
{
  struct PostReservesState *prs = cls;

  if (NULL != prs->prh)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "POST /reserves operation did not complete\n");
    TALER_MERCHANT_reserves_post_cancel (prs->prh);
  }
  GNUNET_free (prs);
}


/**
 * Define a "POST /reserves" CMD
 *
 * @param label command label.
 * @param merchant_url url to the merchant.
 * @param initial_balance initial amount in the reserve.
 * @param exchange_url url to the exchange
 * @param wire_method wire transfer method to use for this reserve
 * @param http_status expected HTTP response code.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_merchant_post_reserves (const char *label,
                                          const char *merchant_url,
                                          const char *initial_balance,
                                          const char *exchange_url,
                                          const char *wire_method,
                                          unsigned int http_status)
{
  struct PostReservesState *prs;

  prs = GNUNET_new (struct PostReservesState);
  prs->merchant_url = merchant_url;
  prs->exchange_url = exchange_url;
  prs->wire_method = wire_method;
  prs->http_status = http_status;
  GNUNET_assert (GNUNET_OK ==
                 TALER_string_to_amount (initial_balance,
                                         &prs->initial_balance));
  {
    struct TALER_TESTING_Command cmd = {
      .cls = prs,
      .label = label,
      .run = &post_reserves_run,
      .cleanup = &post_reserves_cleanup,
      .traits = &post_reserves_traits
    };

    return cmd;
  }
}


/**
 * This commands does not query the backend at all,
 * but just makes up a fake reserve.
 *
 * @param label command label.
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_merchant_post_reserves_fake (const char *label)
{
  struct PostReservesState *prs;

  prs = GNUNET_new (struct PostReservesState);
  {
    struct TALER_TESTING_Command cmd = {
      .cls = prs,
      .label = label,
      .run = &post_reserves_fake_run,
      .cleanup = &post_reserves_cleanup,
      .traits = &post_reserves_traits
    };

    return cmd;
  }
}