/*
   This file is part of TALER
   Copyright (C) 2022 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/update_to_contract_terms_paid.c
 * @brief Implementation of the update_to_contract_terms_paid function for Postgres
 * @author Iván Ávalos
 */
#include "platform.h"
#include <taler/taler_pq_lib.h>
#include "merchant-database/update_to_contract_terms_paid.h"
#include "helper.h"


enum GNUNET_DB_QueryStatus
TALER_MERCHANTDB_update_to_contract_terms_paid (
  struct TALER_MERCHANTDB_PostgresContext *pg,
  const char *instance_id,
  const struct TALER_PrivateContractHashP *h_contract_terms,
  const char *session_id,
  int16_t choice_index)
{
  struct GNUNET_PQ_QueryParam params[] = {
    GNUNET_PQ_query_param_auto_from_type (h_contract_terms),
    GNUNET_PQ_query_param_string (session_id),
    (choice_index >= 0)
      ? GNUNET_PQ_query_param_int16 (&choice_index)
      : GNUNET_PQ_query_param_null (),
    GNUNET_PQ_query_param_end
  };
  struct GNUNET_PQ_QueryParam uparams[] = {
    GNUNET_PQ_query_param_auto_from_type (h_contract_terms),
    GNUNET_PQ_query_param_end
  };
  enum GNUNET_DB_QueryStatus qs;

  /* Session ID must always be given by the caller. */
  GNUNET_assert (NULL != session_id);
  GNUNET_assert (NULL != pg->current_merchant_id);
  GNUNET_assert (0 == strcmp (instance_id,
                              pg->current_merchant_id));

  /* FIXME: combine the 3 individual statements into a stored procedure! */
  /* no preflight check here, run in transaction by caller! */
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Marking h_contract_terms '%s' of %s as paid for session `%s'\n",
              GNUNET_h2s (&h_contract_terms->hash),
              instance_id,
              session_id);
  TMH_PQ_prepare_anon (pg,
                       "UPDATE merchant_contract_terms SET"
                       " paid=TRUE"
                       ",session_id=$2"
                       ",choice_index=$3"
                       " WHERE h_contract_terms=$1");
  qs = GNUNET_PQ_eval_prepared_non_select (pg->conn,
                                           "",
                                           params);
  if (qs <= 0)
    return qs;
  TMH_PQ_prepare_anon (pg,
                       "UPDATE merchant_inventory SET"
                       " total_sold = total_sold"
                       "   + order_locks.total_locked"
                       "   + ((merchant_inventory.total_sold_frac::BIGINT"
                       "       + order_locks.total_locked_frac::BIGINT) / 1000000)"
                       " ,total_sold_frac ="
                       "    ((merchant_inventory.total_sold_frac::BIGINT"
                       "      + order_locks.total_locked_frac::BIGINT) % 1000000)::INT4"
                       " FROM (SELECT total_locked,total_locked_frac,product_serial"
                       "       FROM merchant_order_locks"
                       "       WHERE order_serial="
                       "       (SELECT order_serial"
                       "          FROM merchant_contract_terms"
                       "         WHERE h_contract_terms=$1)"
                       "       ) AS order_locks"
                       " WHERE merchant_inventory.product_serial"
                       "             =order_locks.product_serial");
  qs = GNUNET_PQ_eval_prepared_non_select (pg->conn,
                                           "",
                                           uparams);
  if (qs < 0)
    return qs; /* 0: no inventory management, that's OK! */
  /* ON DELETE CASCADE deletes from merchant_order_locks */
  TMH_PQ_prepare_anon (pg,
                       "DELETE"
                       " FROM merchant_orders"
                       " WHERE order_serial="
                       "       (SELECT order_serial"
                       "          FROM merchant_contract_terms"
                       "         WHERE h_contract_terms=$1)");
  return GNUNET_PQ_eval_prepared_non_select (pg->conn,
                                             "",
                                             uparams);
}
