/*
   This file is part of TALER
   Copyright (C) 2024 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 src/backenddb/get_token_family_key.c
 * @brief Implementation of the get_token_family_key function for Postgres
 * @author Christian Blättler
 */
#include "platform.h"
#include <gnunet/gnunet_pq_lib.h>
#include <gnunet/gnunet_time_lib.h>
#include <string.h>
#include <taler/taler_error_codes.h>
#include <taler/taler_dbevents.h>
#include <taler/taler_pq_lib.h>
#include "merchant-database/get_token_family_key.h"
#include "helper.h"


enum GNUNET_DB_QueryStatus
TALER_MERCHANTDB_get_token_family_key (
  struct TALER_MERCHANTDB_PostgresContext *pg,
  const char *instance_id,
  const char *token_family_slug,
  struct GNUNET_TIME_Timestamp valid_at,
  struct GNUNET_TIME_Timestamp sign_until,
  struct TALER_MERCHANTDB_TokenFamilyKeyDetails *details)
{
  struct GNUNET_PQ_QueryParam params[] = {
    GNUNET_PQ_query_param_string (token_family_slug),
    GNUNET_PQ_query_param_timestamp (&valid_at),
    GNUNET_PQ_query_param_timestamp (&sign_until),
    GNUNET_PQ_query_param_end
  };
  char *kind;
  struct GNUNET_PQ_ResultSpec rs[] = {
    GNUNET_PQ_result_spec_allow_null (
      GNUNET_PQ_result_spec_blind_sign_pub ("pub",
                                            &details->pub.public_key),
      NULL),
    GNUNET_PQ_result_spec_allow_null (
      GNUNET_PQ_result_spec_blind_sign_priv ("priv",
                                             &details->priv.private_key),
      NULL),
    GNUNET_PQ_result_spec_allow_null (
      GNUNET_PQ_result_spec_timestamp ("signature_validity_start",
                                       &details->signature_validity_start),
      NULL),
    GNUNET_PQ_result_spec_allow_null (
      GNUNET_PQ_result_spec_timestamp ("signature_validity_end",
                                       &details->signature_validity_end),
      NULL),
    GNUNET_PQ_result_spec_allow_null (
      GNUNET_PQ_result_spec_timestamp ("private_key_deleted_at",
                                       &details->private_key_deleted_at),
      NULL),
    GNUNET_PQ_result_spec_string ("slug",
                                  &details->token_family.slug),
    GNUNET_PQ_result_spec_string ("name",
                                  &details->token_family.name),
    GNUNET_PQ_result_spec_string ("cipher_choice",
                                  &details->token_family.cipher_spec),
    GNUNET_PQ_result_spec_string ("description",
                                  &details->token_family.description),
    TALER_PQ_result_spec_json ("description_i18n",
                               &details->token_family.description_i18n),
    GNUNET_PQ_result_spec_timestamp ("valid_after",
                                     &details->token_family.valid_after),
    GNUNET_PQ_result_spec_timestamp ("valid_before",
                                     &details->token_family.valid_before),
    GNUNET_PQ_result_spec_relative_time ("duration",
                                         &details->token_family.duration),
    GNUNET_PQ_result_spec_relative_time ("validity_granularity",
                                         &details->token_family.
                                         validity_granularity),
    GNUNET_PQ_result_spec_relative_time ("start_offset",
                                         &details->token_family.start_offset),
    GNUNET_PQ_result_spec_string ("kind",
                                  &kind),
    GNUNET_PQ_result_spec_uint64 ("issued",
                                  &details->token_family.issued),
    GNUNET_PQ_result_spec_uint64 ("used",
                                  &details->token_family.used),
    GNUNET_PQ_result_spec_end
  };
  enum GNUNET_DB_QueryStatus qs;

  GNUNET_assert (NULL != pg->current_merchant_id);
  GNUNET_assert (0 == strcmp (instance_id,
                              pg->current_merchant_id));
  TMH_PQ_prepare_anon (pg,
                       "SELECT"
                       " h_pub"
                       ",pub"
                       ",priv"
                       ",cipher_choice"
                       ",mtfk.signature_validity_start"
                       ",mtfk.signature_validity_end"
                       ",mtfk.private_key_deleted_at"
                       ",slug"
                       ",name"
                       ",description"
                       ",description_i18n::TEXT"
                       ",mtf.valid_after"
                       ",mtf.valid_before"
                       ",duration"
                       ",validity_granularity"
                       ",start_offset"
                       ",kind"
                       ",issued"
                       ",used"
                       " FROM merchant_token_families mtf"
                       " LEFT JOIN merchant_token_family_keys mtfk"
                       "  ON ( (mtf.token_family_serial = mtfk.token_family_serial)"
                       "   AND ($2 >= mtfk.signature_validity_start)"
                       "   AND ($2 <= mtfk.signature_validity_end)"
                       "   AND ($3 <= mtfk.private_key_deleted_at) )"
                       " WHERE slug=$1"
                       " ORDER BY mtfk.signature_validity_start ASC"
                       " LIMIT 1");
  memset (details,
          0,
          sizeof (*details));
  qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
                                                 "",
                                                 params,
                                                 rs);
  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
  {
    if (0 == strcmp (kind,
                     "discount"))
    {
      details->token_family.kind = TALER_MERCHANTDB_TFK_Discount;
    }
    else if (0 == strcmp (kind,
                          "subscription"))
    {
      details->token_family.kind = TALER_MERCHANTDB_TFK_Subscription;
    }
    else
    {
      GNUNET_free (kind);
      GNUNET_free (details->token_family.slug);
      GNUNET_free (details->token_family.name);
      GNUNET_free (details->token_family.description);
      json_decref (details->token_family.description_i18n);
      GNUNET_CRYPTO_blind_sign_pub_decref (details->pub.public_key);
      GNUNET_CRYPTO_blind_sign_priv_decref (details->priv.private_key);
      GNUNET_free (details->token_family.cipher_spec);
      GNUNET_break (0);
      return GNUNET_DB_STATUS_HARD_ERROR;
    }
    GNUNET_free (kind);
  }
  return qs;
}
