/*
   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/donaudb/get_charity.c
 * @brief Implementation of the get_charity function for Postgres
 * @author Johannes Casaburi
 */
#include <donau_config.h>
#include <taler/taler_error_codes.h>
#include <taler/taler_dbevents.h>
#include <taler/taler_pq_lib.h>
#include "get_charity.h"
#include "helper.h"


enum GNUNET_DB_QueryStatus
DONAUDB_get_charity (
  struct DONAUDB_PostgresContext *ctx,
  uint64_t charity_id,
  struct DONAUDB_CharityMetaData *meta)
{
  struct GNUNET_PQ_QueryParam params[] = {
    GNUNET_PQ_query_param_uint64 (&charity_id),
    GNUNET_PQ_query_param_end
  };
  struct GNUNET_PQ_ResultSpec rs[] = {
    GNUNET_PQ_result_spec_auto_from_type ("charity_pub",
                                          &meta->charity_pub),
    GNUNET_PQ_result_spec_string ("charity_name",
                                  &meta->charity_name),
    GNUNET_PQ_result_spec_string ("charity_url",
                                  &meta->charity_url),
    TALER_PQ_RESULT_SPEC_AMOUNT ("max_per_year",
                                 &meta->max_per_year),
    TALER_PQ_RESULT_SPEC_AMOUNT ("receipts_to_date",
                                 &meta->receipts_to_date),
    GNUNET_PQ_result_spec_uint32 ("current_year",
                                  &meta->current_year),
    GNUNET_PQ_result_spec_end
  };
  enum GNUNET_DB_QueryStatus qs;

  PREPARE (ctx,
           "get_charity",
           "SELECT "
           " charity_pub"
           " ,charity_name"
           " ,charity_url"
           " ,max_per_year"
           " ,receipts_to_date"
           " ,current_year"
           " FROM charities"
           " WHERE charity_id=$1;");
  qs = GNUNET_PQ_eval_prepared_singleton_select (ctx->conn,
                                                 "get_charity",
                                                 params,
                                                 rs);
  if ( (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs) &&
       (meta->current_year != GNUNET_TIME_get_current_year ()) )
  {
    /* receipts_to_date is only reset by the first issue request of a new
       year, so the stored value belongs to `current_year'.  Report zero
       for any other year, exactly as DONAUDB_iterate_charities() does --
       otherwise GET /charity/$ID and GET /charities disagree, and PATCH
       refuses to lower max_per_year below *last* year's total. */
    GNUNET_assert (GNUNET_OK ==
                   TALER_amount_set_zero (meta->max_per_year.currency,
                                          &meta->receipts_to_date));
  }
  return qs;
}
