/*
   This file is part of TALER
   Copyright (C) 2022, 2025 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 exchangedb/get_old_coin_by_h_blind.c
 * @brief Implementation of the get_old_coin_by_h_blind function for Postgres
 * @author Christian Grothoff
 * @author Özgür Kesim
 */
#include "taler/taler_pq_lib.h"
#include "exchange-database/get_old_coin_by_h_blind.h"
#include "helper.h"


enum GNUNET_DB_QueryStatus
TALER_EXCHANGEDB_get_old_coin_by_h_blind (
  struct TALER_EXCHANGEDB_PostgresContext *pg,
  const struct TALER_BlindedCoinHashP *h_blind_ev,
  struct TALER_CoinSpendPublicKeyP *old_coin_pub,
  uint64_t *refresh_id)
{
  struct GNUNET_PQ_QueryParam params[] = {
    GNUNET_PQ_query_param_auto_from_type (h_blind_ev),
    GNUNET_PQ_query_param_end
  };
  struct GNUNET_PQ_ResultSpec rs[] = {
    GNUNET_PQ_result_spec_auto_from_type ("old_coin_pub",
                                          old_coin_pub),
    GNUNET_PQ_result_spec_uint64 ("refresh_id",
                                  refresh_id),
    GNUNET_PQ_result_spec_end
  };

  /* Used in #postgres_get_old_coin_by_h_blind() */
  PREPARE (pg,
           "get_old_coin_by_h_blind",
           "SELECT"
           " okc.coin_pub AS old_coin_pub"
           ",refresh_id"
           " FROM refresh "
           " JOIN known_coins okc ON (refresh.old_coin_pub = okc.coin_pub)"
           " WHERE $1=ANY(h_blind_evs)"
           " LIMIT 1;");
  return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
                                                   "get_old_coin_by_h_blind",
                                                   params,
                                                   rs);
}
