/*
  This file is part of TALER
  Copyright (C) 2014, 2015 GNUnet e.V.

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU Affero 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License along with
  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file taler-exchange-httpd_admin.c
 * @brief Handle /admin/ requests
 * @author Christian Grothoff
 */
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <jansson.h>
#include "taler-exchange-httpd_admin.h"
#include "taler-exchange-httpd_parsing.h"
#include "taler-exchange-httpd_responses.h"
#include "taler-exchange-httpd_validation.h"


/**
 * Closure for #admin_add_incoming_transaction()
 */
struct AddIncomingContext
{
  /**
   * public key of the reserve
   */
  struct TALER_ReservePublicKeyP reserve_pub;

  /**
   * amount to add to the reserve
   */
  struct TALER_Amount amount;

  /**
   * When did we receive the wire transfer
   */
  struct GNUNET_TIME_Absolute execution_time;

  /**
   * which account send the funds
   */
  json_t *sender_account_details;

  /**
   * Information that uniquely identifies the transfer
   */
  json_t *transfer_details;

  /**
   * Set to the transaction status.
   */
  enum GNUNET_DB_QueryStatus qs;
};


/** 
 * Add an incoming transaction to the database.  Checks if the
 * transaction is fresh (not a duplicate) and if so adds it to
 * the database.
 *
 * If it returns a non-error code, the transaction logic MUST
 * NOT queue a MHD response.  IF it returns an hard error, the
 * transaction logic MUST queue a MHD response and set @a mhd_ret.  IF
 * it returns the soft error code, the function MAY be called again to
 * retry and MUST not queue a MHD response.
 *
 * @param cls closure with the `struct AddIncomingContext *`
 * @param connection MHD request which triggered the transaction
 * @param session database session to use
 * @param[out] mhd_ret set to MHD response status for @a connection,
 *             if transaction failed (!)
 * @return transaction status
 */
static enum GNUNET_DB_QueryStatus
admin_add_incoming_transaction (void *cls,
				struct MHD_Connection *connection,
				struct TALER_EXCHANGEDB_Session *session,
				int *mhd_ret)
{
  struct AddIncomingContext *aic = cls;
  void *json_str;

  json_str = json_dumps (aic->transfer_details,
                         JSON_INDENT(2));
  if (NULL == json_str)
  {
    GNUNET_break (0);
    *mhd_ret = TEH_RESPONSE_reply_internal_db_error (connection,
						     TALER_EC_PARSER_OUT_OF_MEMORY);
    return GNUNET_DB_STATUS_HARD_ERROR;
  }
  aic->qs = TEH_plugin->reserves_in_insert (TEH_plugin->cls,
					    session,
					    &aic->reserve_pub,
					    &aic->amount,
					    aic->execution_time,
					    aic->sender_account_details,
					    json_str,
					    strlen (json_str));
  free (json_str);
  
  if (GNUNET_DB_STATUS_HARD_ERROR == aic->qs)
  {
    GNUNET_break (0);
    *mhd_ret = TEH_RESPONSE_reply_internal_db_error (connection,
						     TALER_EC_ADMIN_ADD_INCOMING_DB_STORE);
    return GNUNET_DB_STATUS_HARD_ERROR;
  }
  return aic->qs;
}


/**
 * Handle a "/admin/add/incoming" request.  Parses the
 * given "reserve_pub", "amount", "transaction" and "h_wire"
 * details and adds the respective transaction to the database.
 *
 * @param rh context of the handler
 * @param connection the MHD connection to handle
 * @param[in,out] connection_cls the connection's closure (can be updated)
 * @param upload_data upload data
 * @param[in,out] upload_data_size number of bytes (left) in @a upload_data
 * @return MHD result code
  */
int
TEH_ADMIN_handler_admin_add_incoming (struct TEH_RequestHandler *rh,
                                      struct MHD_Connection *connection,
                                      void **connection_cls,
                                      const char *upload_data,
                                      size_t *upload_data_size)
{
  struct AddIncomingContext aic;
  enum TALER_ErrorCode ec;
  char *emsg;
  json_t *root;
  struct GNUNET_JSON_Specification spec[] = {
    GNUNET_JSON_spec_fixed_auto ("reserve_pub", &aic.reserve_pub),
    TALER_JSON_spec_amount ("amount", &aic.amount),
    GNUNET_JSON_spec_absolute_time ("execution_date", &aic.execution_time),
    GNUNET_JSON_spec_json ("sender_account_details", &aic.sender_account_details),
    GNUNET_JSON_spec_json ("transfer_details", &aic.transfer_details),
    GNUNET_JSON_spec_end ()
  };
  int res;
  int mhd_ret;

  res = TEH_PARSE_post_json (connection,
                             connection_cls,
                             upload_data,
                             upload_data_size,
                             &root);
  if (GNUNET_SYSERR == res)
    return MHD_NO;
  if ( (GNUNET_NO == res) ||
       (NULL == root) )
    return MHD_YES;
  res = TEH_PARSE_json_data (connection,
                             root,
                             spec);
  json_decref (root);
  if (GNUNET_OK != res)
  {
    GNUNET_break_op (0);
    json_decref (root);
    return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
  }
  if (TALER_EC_NONE !=
      (ec = TEH_json_validate_wireformat (aic.sender_account_details,
                                          GNUNET_NO,
                                          &emsg)))
  {
    GNUNET_JSON_parse_free (spec);
    mhd_ret = TEH_RESPONSE_reply_external_error (connection,
						 ec,
						 emsg);
    GNUNET_free (emsg);
    return mhd_ret;
  }
  if (0 != strcasecmp (aic.amount.currency,
                       TEH_exchange_currency_string))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Exchange uses currency `%s', but /admin/add/incoming tried to use currency `%s'\n",
                TEH_exchange_currency_string,
                aic.amount.currency);
    GNUNET_JSON_parse_free (spec);
    return TEH_RESPONSE_reply_arg_invalid (connection,
					   TALER_EC_ADMIN_ADD_INCOMING_CURRENCY_UNSUPPORTED,
                                           "amount:currency");
  }
  res = TEH_DB_run_transaction (connection,
				&mhd_ret,
				&admin_add_incoming_transaction,
				&aic);
  GNUNET_JSON_parse_free (spec);
  if (GNUNET_OK != res)
    return mhd_ret;
  return TEH_RESPONSE_reply_json_pack (connection,
                                       MHD_HTTP_OK,
                                       "{s:s}",
                                       "status",
                                       (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == aic.qs)
                                       ? "NEW"
                                       : "DUP");
}

/* end of taler-exchange-httpd_admin.c */