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/*
  This file is part of TALER
  (C) 2017-2020 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 backend/taler-merchant-httpd_post-tips-ID-pickup.c
 * @brief implementation of a POST /tips/ID/pickup handler
 * @author Christian Grothoff
 */
#include "platform.h"
#include <microhttpd.h>
#include <jansson.h>
#include <taler/taler_json_lib.h>
#include <taler/taler_signatures.h>
#include "taler-merchant-httpd.h"
#include "taler-merchant-httpd_mhd.h"
#include "taler-merchant-httpd_exchanges.h"
#include "taler-merchant-httpd_tip-pickup.h"


/**
 * We are shutting down, force resuming all suspended pickup operations.
 */
void
TMH_force_tip_pickup_resume ()
{
  // FIXME!
}


/**
 * Manages a POST /tips/$ID/pickup call, checking that the tip is authorized,
 * and if so, returning the blind signatures.
 *
 * @param rh context of the handler
 * @param connection the MHD connection to handle
 * @param[in,out] hc context with further information about the request
 * @return MHD result code
 */
MHD_RESULT
TMH_post_tips_ID_pickup (const struct TMH_RequestHandler *rh,
                         struct MHD_Connection *connection,
                         struct TMH_HandlerContext *hc)
{
  char *exchange_url;
  struct GNUNET_HashCode tip_id;
  struct TALER_Amount tip_amount;
  struct TALER_Amount tip_amount_left;
  struct GNUNET_TIME_Absolute timestamp;
  struct GNUNET_TIME_Absolute timestamp_expire;
  MHD_RESULT ret;
  enum GNUNET_DB_QueryStatus qs;

  GNUNET_assert (NULL != hc->infix);
  if (GNUNET_OK !=
      GNUNET_CRYPTO_hash_from_string (hc->infix,
                                      &tip_id))
  {
    /* tip_id has wrong encoding */
    GNUNET_break_op (0);
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_BAD_REQUEST,
                                       TALER_EC_PARAMETER_MALFORMED,
                                       "tip_id malformed");
  }

  db->preflight (db->cls);
  // FIXME: logic here is completely bonkers!
  qs = db->lookup_tip_by_id (db->cls,
                             &tip_id,
                             &exchange_url,
                             &extra,
                             &tip_amount,
                             &tip_amount_left,
                             &timestamp);

  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != qs)
  {
    unsigned int response_code;
    enum TALER_ErrorCode ec;

    switch (qs)
    {
    case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
      ec = TALER_EC_TIP_PICKUP_TIP_ID_UNKNOWN;
      response_code = MHD_HTTP_NOT_FOUND;
      break;
    case GNUNET_DB_STATUS_SOFT_ERROR:
      ec = TALER_EC_TIP_PICKUP_DB_ERROR_SOFT;
      response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
      break;
    case GNUNET_DB_STATUS_HARD_ERROR:
      ec = TALER_EC_TIP_PICKUP_DB_ERROR_HARD;
      response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
      break;
    default:
      GNUNET_break (0);
      ec = TALER_EC_INTERNAL_LOGIC_ERROR;
      response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
      break;
    }
    return TALER_MHD_reply_with_error (connection,
                                       response_code,
                                       ec,
                                       "Could not determine exchange URL for the given tip id");
  }

  timestamp_expire = GNUNET_TIME_absolute_add (timestamp,
                                               GNUNET_TIME_UNIT_DAYS);

  ret = TALER_MHD_reply_json_pack (
    connection,
    MHD_HTTP_OK,
    "{s:s, s:o, s:o, s:o, s:o, s:o}",
    "exchange_url", exchange_url,
    "amount", TALER_JSON_from_amount (&tip_amount),
    "amount_left", TALER_JSON_from_amount (&tip_amount_left),
    "stamp_created", GNUNET_JSON_from_time_abs (timestamp),
    "stamp_expire", GNUNET_JSON_from_time_abs (timestamp_expire),
    "extra", extra);

  GNUNET_free (exchange_url);
  json_decref (extra);
  return ret;
}