/*
   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 insert_auditor_progress.c
 * @brief Low-level (statement-level) Postgres database access for the exchange
 * @author Christian Grothoff
 */
#include "taler/taler_pq_lib.h"
#include "auditor-database/insert_auditor_progress.h"
#include "pg_helper.h"


enum GNUNET_DB_QueryStatus
TALER_AUDITORDB_insert_auditor_progress (
  struct TALER_AUDITORDB_PostgresContext *pg,
  const char *progress_key,
  uint64_t progress_offset,
  ...)
{
  unsigned int cnt = 1;
  va_list ap;

  va_start (ap,
            progress_offset);
  while (NULL != va_arg (ap,
                         const char *))
  {
    cnt++;
    (void) va_arg (ap,
                   uint64_t);
  }
  va_end (ap);
  {
    const char *keys[cnt];
    uint64_t offsets[cnt];
    unsigned int off = 1;
    struct GNUNET_PQ_QueryParam params[] = {
      GNUNET_PQ_query_param_array_ptrs_string (cnt,
                                               keys,
                                               pg->conn),
      GNUNET_PQ_query_param_array_uint64 (cnt,
                                          offsets,
                                          pg->conn),
      GNUNET_PQ_query_param_end
    };
    enum GNUNET_DB_QueryStatus qs;

    keys[0] = progress_key;
    offsets[0] = progress_offset;

    va_start (ap,
              progress_offset);
    while (off < cnt)
    {
      keys[off] = va_arg (ap,
                          const char *);
      offsets[off] = va_arg (ap,
                             uint64_t);
      off++;
    }
    GNUNET_assert (NULL == va_arg (ap,
                                   const char *));
    va_end (ap);

    /* Note: this is an upsert, not a plain INSERT: the auditor helpers
       cannot tell from the query status of
       #TALER_AUDITORDB_get_auditor_progress() whether a progress row
       already exists (auditor_do_get_auditor_progress() returns one
       row per key, present or not), so this function stores the
       offset regardless of whether the row already exists.
       DISTINCT ON is required because a caller may pass the same key
       twice; ON CONFLICT DO UPDATE cannot touch a row twice in one
       statement. */
    PREPARE (pg,
             "insert_auditor_progress",
             "INSERT INTO auditor_progress "
             "(progress_key"
             ",progress_offset"
             ") SELECT DISTINCT ON (key) key,off"
             " FROM UNNEST (CAST($1 AS TEXT[]),"
             "              CAST($2 AS INT8[]))"
             "   AS t(key,off)"
             " ON CONFLICT (progress_key) DO UPDATE"
             "   SET progress_offset=excluded.progress_offset;");
    qs = GNUNET_PQ_eval_prepared_non_select (pg->conn,
                                             "insert_auditor_progress",
                                             params);
    GNUNET_PQ_cleanup_query_params_closures (params);
    return qs;
  }
}
