/*
   This file is part of TALER
   Copyright (C) 2023 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 backenddb/pg_lookup_pending_deposits.c
 * @brief Implementation of the lookup_pending_deposits function for Postgres
 * @author Christian Grothoff
 */
#include "platform.h"
#include <taler/taler_error_codes.h>
#include <taler/taler_dbevents.h>
#include <taler/taler_pq_lib.h>
#include "pg_lookup_pending_deposits.h"
#include "pg_helper.h"


/**
 * Context for lookup_pending_deposits().
 */
struct LookupDepositsContext
{
  /**
   * Function to call with the results.
   */
  TALER_MERCHANTDB_PendingDepositsCallback cb;

  /**
   * Closure for @e cb.
   */
  void *cb_cls;

  /**
   * Database context.
   */
  struct PostgresClosure *pg;

  /**
   * Set to the return value on errors.
   */
  enum GNUNET_DB_QueryStatus qs;

};


/**
 * Function to be called with the results of a SELECT statement
 * that has returned @a num_results results about instances.
 *
 * @param cls of type `struct LookupDepositsContext *`
 * @param result the postgres result
 * @param num_results the number of results in @a result
 */
static void
lookup_deposits_cb (void *cls,
                    PGresult *result,
                    unsigned int num_results)
{
  struct LookupDepositsContext *ldc = cls;

  for (unsigned int i = 0; i < num_results; i++)
  {
    uint64_t deposit_serial;
    struct GNUNET_TIME_Absolute wire_deadline;
    struct GNUNET_TIME_Relative retry_backoff;
    struct TALER_PrivateContractHashP h_contract_terms;
    struct TALER_MerchantPrivateKeyP merchant_priv;
    char *instance_id;
    struct TALER_MerchantWireHashP h_wire;
    struct TALER_Amount amount_with_fee;
    struct TALER_Amount deposit_fee;
    struct TALER_CoinSpendPublicKeyP coin_pub;
    struct GNUNET_PQ_ResultSpec rs[] = {
      GNUNET_PQ_result_spec_uint64 ("deposit_serial",
                                    &deposit_serial),
      GNUNET_PQ_result_spec_auto_from_type ("h_contract_terms",
                                            &h_contract_terms),
      GNUNET_PQ_result_spec_auto_from_type ("merchant_priv",
                                            &merchant_priv),
      GNUNET_PQ_result_spec_string ("merchant_id",
                                    &instance_id),
      GNUNET_PQ_result_spec_absolute_time ("wire_transfer_deadline",
                                           &wire_deadline),
      GNUNET_PQ_result_spec_relative_time ("retry_backoff",
                                           &retry_backoff),
      GNUNET_PQ_result_spec_auto_from_type ("h_wire",
                                            &h_wire),
      TALER_PQ_result_spec_amount_with_currency ("amount_with_fee",
                                                 &amount_with_fee),
      TALER_PQ_result_spec_amount_with_currency ("deposit_fee",
                                                 &deposit_fee),
      GNUNET_PQ_result_spec_auto_from_type ("coin_pub",
                                            &coin_pub),
      GNUNET_PQ_result_spec_end
    };

    if (GNUNET_OK !=
        GNUNET_PQ_extract_result (result,
                                  rs,
                                  i))
    {
      GNUNET_break (0);
      ldc->qs = GNUNET_DB_STATUS_HARD_ERROR;
      return;
    }
    ldc->cb (ldc->cb_cls,
             deposit_serial,
             wire_deadline,
             retry_backoff,
             &h_contract_terms,
             &merchant_priv,
             instance_id,
             &h_wire,
             &amount_with_fee,
             &deposit_fee,
             &coin_pub);
    GNUNET_PQ_cleanup_result (rs);
  }
}


enum GNUNET_DB_QueryStatus
TMH_PG_lookup_pending_deposits (
  void *cls,
  const char *exchange_url,
  uint64_t limit,
  bool allow_future,
  TALER_MERCHANTDB_PendingDepositsCallback cb,
  void *cb_cls)
{
  struct PostgresClosure *pg = cls;
  struct LookupDepositsContext ldc = {
    .cb = cb,
    .cb_cls = cb_cls,
    .pg = pg
  };
  struct GNUNET_TIME_Absolute now
    = GNUNET_TIME_absolute_get ();
  struct GNUNET_PQ_QueryParam params[] = {
    GNUNET_PQ_query_param_string (exchange_url),
    GNUNET_PQ_query_param_absolute_time (&now),
    GNUNET_PQ_query_param_uint64 (&limit),
    GNUNET_PQ_query_param_bool (allow_future),
    GNUNET_PQ_query_param_end
  };
  enum GNUNET_DB_QueryStatus qs;

  check_connection (pg);
  PREPARE (pg,
           "lookup_pending_deposits",
           "SELECT"
           " md.deposit_serial"
           ",mct.h_contract_terms"
           ",mk.merchant_priv"
           ",mi.merchant_id"
           ",mdc.wire_transfer_deadline"
           ",ma.h_wire"
           ",md.amount_with_fee"
           ",md.deposit_fee"
           ",md.coin_pub"
           ",mdc.retry_backoff"
           " FROM merchant_deposit_confirmations mdc"
           " JOIN merchant_contract_terms mct"
           "  USING (order_serial)"
           " JOIN merchant_accounts ma"
           "  USING (account_serial)"
           " LEFT JOIN merchant_kyc kyc"
           "  ON (ma.account_serial=kyc.account_serial)"
           " JOIN merchant_instances mi"
           "  ON (mct.merchant_serial=mi.merchant_serial)"
           " JOIN merchant_keys mk"
           "  ON (mi.merchant_serial=mk.merchant_serial)"
           " JOIN merchant_deposits md"
           "  USING (deposit_confirmation_serial)"
           " WHERE mdc.wire_pending"
           "  AND (mdc.exchange_url=$1)"
           "  AND ($4 OR (mdc.wire_transfer_deadline < $2))"
           "  AND ( (kyc.kyc_ok IS NULL) OR kyc.kyc_ok)"
           " ORDER BY mdc.wire_transfer_deadline ASC"
           " LIMIT $3");
  qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
                                             "lookup_pending_deposits",
                                             params,
                                             &lookup_deposits_cb,
                                             &ldc);
  if (0 > ldc.qs)
    return ldc.qs;
  return qs;
}