/*
  This file is part of TALER
  (C) 2016-2023 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 bank-lib/fakebank_bank_post_withdrawals_confirm.c
 * @brief implement bank API withdrawals /confirm endpoint
 * @author Christian Grothoff <christian@grothoff.org>
 */
#include "platform.h"
#include <pthread.h>
#include "taler_fakebank_lib.h"
#include "taler_bank_service.h"
#include "taler_mhd_lib.h"
#include <gnunet/gnunet_mhd_compat.h>
#include "fakebank.h"
#include "fakebank_bank_post_withdrawals_confirm.h"
#include "fakebank_common_lookup.h"
#include "fakebank_common_lp.h"
#include "fakebank_common_make_admin_transfer.h"


/**
 * Handle POST /withdrawals/{withdrawal_id}/confirm request.
 *
 * @param h our fakebank handle
 * @param connection the connection
 * @param withdrawal_id the withdrawal operation identifier
 * @return MHD result code
 */
MHD_RESULT
TALER_FAKEBANK_bank_withdrawals_confirm_ (
  struct TALER_FAKEBANK_Handle *h,
  struct MHD_Connection *connection,
  const char *withdrawal_id)
{
  struct WithdrawalOperation *wo;

  GNUNET_assert (0 ==
                 pthread_mutex_lock (&h->big_lock));
  wo = TALER_FAKEBANK_lookup_withdrawal_operation_ (h,
                                                    withdrawal_id);
  if (NULL == wo)
  {
    GNUNET_assert (0 ==
                   pthread_mutex_unlock (&h->big_lock));
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_NOT_FOUND,
                                       TALER_EC_BANK_TRANSACTION_NOT_FOUND,
                                       withdrawal_id);
  }
  if (NULL == wo->exchange_account)
  {
    GNUNET_assert (0 ==
                   pthread_mutex_unlock (&h->big_lock));
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_BAD_REQUEST,
                                       TALER_EC_BANK_POST_WITHDRAWAL_OPERATION_REQUIRED,
                                       NULL);
  }
  if (wo->aborted)
  {
    GNUNET_assert (0 ==
                   pthread_mutex_unlock (&h->big_lock));
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_CONFLICT,
                                       TALER_EC_BANK_CONFIRM_ABORT_CONFLICT,
                                       withdrawal_id);
  }
  GNUNET_assert (0 ==
                 pthread_mutex_unlock (&h->big_lock));
  if (GNUNET_OK !=
      TALER_FAKEBANK_make_admin_transfer_ (
        h,
        wo->debit_account->account_name,
        wo->exchange_account->account_name,
        &wo->amount,
        &wo->reserve_pub,
        &wo->row_id,
        &wo->timestamp))
  {
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_CONFLICT,
                                       TALER_EC_BANK_DUPLICATE_RESERVE_PUB_SUBJECT,
                                       NULL);
  }
  /* Re-acquiring the lock and continuing to operate on 'wo'
     is currently (!) acceptable because we NEVER free 'wo'
     until shutdown. We may want to revise this if keeping
     all withdraw operations in RAM becomes an issue... */
  GNUNET_assert (0 ==
                 pthread_mutex_lock (&h->big_lock));
  wo->confirmation_done = true;
  TALER_FAKEBANK_notify_withdrawal_ (h,
                                     wo);
  GNUNET_assert (0 ==
                 pthread_mutex_unlock (&h->big_lock));
  return TALER_MHD_reply_json (connection,
                               json_object (),
                               MHD_HTTP_OK);
}