/*
  This file is part of TALER
  Copyright (C) 2014-2020 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 testing/testing_api_cmd_transfer_get.c
 * @brief Implement the testing CMDs for the /transfer GET operation.
 * @author Marcello Stanisci
 */
#include "platform.h"
#include "taler_json_lib.h"
#include <gnunet/gnunet_curl_lib.h>
#include "taler_testing_lib.h"

/**
 * State for a "track transfer" CMD.
 */
struct TrackTransferState
{

  /**
   * Expected amount for the WTID being tracked.
   */
  const char *expected_total_amount;

  /**
   * Expected fee for this WTID.
   */
  const char *expected_wire_fee;

  /**
   * Our command.
   */
  const struct TALER_TESTING_Command *cmd;

  /**
   * Reference to any operation that can provide a WTID.
   * Will be the WTID to track.
   */
  const char *wtid_reference;

  /**
   * Reference to any operation that can provide wire details.
   * Those wire details will then be matched against the credit
   * bank account of the tracked WTID.  This way we can test that
   * a wire transfer paid back one particular bank account.
   */
  const char *wire_details_reference;

  /**
   * Reference to any operation that can provide an amount.
   * This way we can check that the transferred amount matches
   * our expectations.
   */
  const char *total_amount_reference;

  /**
   * Handle to a pending "track transfer" operation.
   */
  struct TALER_EXCHANGE_TransfersGetHandle *tth;

  /**
   * Interpreter state.
   */
  struct TALER_TESTING_Interpreter *is;

  /**
   * Expected HTTP response code.
   */
  unsigned int expected_response_code;

};


/**
 * Cleanup the state for a "track transfer" CMD, and possibly
 * cancel a pending operation thereof.
 *
 * @param cls closure.
 * @param cmd the command which is being cleaned up.
 */
static void
track_transfer_cleanup (void *cls,
                        const struct TALER_TESTING_Command *cmd)
{

  struct TrackTransferState *tts = cls;

  if (NULL != tts->tth)
  {
    TALER_TESTING_command_incomplete (tts->is,
                                      cmd->label);
    TALER_EXCHANGE_transfers_get_cancel (tts->tth);
    tts->tth = NULL;
  }
  GNUNET_free (tts);
}


/**
 * Check whether the HTTP response code from a "track transfer"
 * operation is acceptable, and all other values like total amount,
 * wire fees and hashed wire details as well.
 *
 * @param cls closure.
 * @param tgr response details
 */
static void
track_transfer_cb (void *cls,
                   const struct TALER_EXCHANGE_TransfersGetResponse *tgr)
{
  struct TrackTransferState *tts = cls;
  const struct TALER_EXCHANGE_HttpResponse *hr = &tgr->hr;
  struct TALER_TESTING_Interpreter *is = tts->is;
  struct TALER_Amount expected_amount;

  tts->tth = NULL;
  if (tts->expected_response_code != hr->http_status)
  {
    TALER_TESTING_unexpected_status (is,
                                     hr->http_status,
                                     tts->expected_response_code);
    return;
  }

  switch (hr->http_status)
  {
  case MHD_HTTP_OK:
    {
      const struct TALER_EXCHANGE_TransferData *ta
        = &tgr->details.ok.td;

      if (NULL == tts->expected_total_amount)
      {
        GNUNET_break (0);
        TALER_TESTING_interpreter_fail (is);
        return;
      }
      if (NULL == tts->expected_wire_fee)
      {
        GNUNET_break (0);
        TALER_TESTING_interpreter_fail (is);
        return;
      }

      if (GNUNET_OK !=
          TALER_string_to_amount (tts->expected_total_amount,
                                  &expected_amount))
      {
        GNUNET_break (0);
        TALER_TESTING_interpreter_fail (is);
        return;
      }
      if (0 != TALER_amount_cmp (&ta->total_amount,
                                 &expected_amount))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Total amount mismatch to command %s - "
                    "%s vs %s\n",
                    tts->cmd->label,
                    TALER_amount_to_string (&ta->total_amount),
                    TALER_amount_to_string (&expected_amount));
        json_dumpf (hr->reply,
                    stderr,
                    0);
        fprintf (stderr, "\n");
        TALER_TESTING_interpreter_fail (is);
        return;
      }

      if (GNUNET_OK !=
          TALER_string_to_amount (tts->expected_wire_fee,
                                  &expected_amount))
      {
        GNUNET_break (0);
        TALER_TESTING_interpreter_fail (is);
        return;
      }

      if (0 != TALER_amount_cmp (&ta->wire_fee,
                                 &expected_amount))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Wire fee mismatch to command %s\n",
                    tts->cmd->label);
        json_dumpf (hr->reply,
                    stderr,
                    0);
        TALER_TESTING_interpreter_fail (is);
        return;
      }

      /**
       * Optionally checking: (1) wire-details for this transfer
       * match the ones from a referenced "deposit" operation -
       * or any operation that could provide wire-details.  (2)
       * Total amount for this transfer matches the one from any
       * referenced command that could provide one.
       */
      if (NULL != tts->wire_details_reference)
      {
        const struct TALER_TESTING_Command *wire_details_cmd;
        const char *payto_uri;
        struct TALER_PaytoHashP h_payto;

        wire_details_cmd
          = TALER_TESTING_interpreter_lookup_command (is,
                                                      tts->
                                                      wire_details_reference);
        if (NULL == wire_details_cmd)
        {
          GNUNET_break (0);
          TALER_TESTING_interpreter_fail (is);
          return;
        }
        if (GNUNET_OK !=
            TALER_TESTING_get_trait_payto_uri (wire_details_cmd,
                                               &payto_uri))
        {
          GNUNET_break (0);
          TALER_TESTING_interpreter_fail (is);
          return;
        }
        TALER_payto_hash (payto_uri,
                          &h_payto);
        if (0 != GNUNET_memcmp (&h_payto,
                                &ta->h_payto))
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Wire hash missmath to command %s\n",
                      tts->cmd->label);
          json_dumpf (hr->reply,
                      stderr,
                      0);
          TALER_TESTING_interpreter_fail (is);
          return;
        }
      }
      if (NULL != tts->total_amount_reference)
      {
        const struct TALER_TESTING_Command *total_amount_cmd;
        const struct TALER_Amount *total_amount_from_reference;

        total_amount_cmd
          = TALER_TESTING_interpreter_lookup_command (is,
                                                      tts->
                                                      total_amount_reference);
        if (NULL == total_amount_cmd)
        {
          GNUNET_break (0);
          TALER_TESTING_interpreter_fail (is);
          return;
        }
        if (GNUNET_OK !=
            TALER_TESTING_get_trait_amount (total_amount_cmd,
                                            &total_amount_from_reference))
        {
          GNUNET_break (0);
          TALER_TESTING_interpreter_fail (is);
          return;
        }
        if (0 != TALER_amount_cmp (&ta->total_amount,
                                   total_amount_from_reference))
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Amount mismatch in command %s\n",
                      tts->cmd->label);
          json_dumpf (hr->reply,
                      stderr,
                      0);
          TALER_TESTING_interpreter_fail (is);
          return;
        }
      }
      break;
    } /* case OK */
  } /* switch on status */
  TALER_TESTING_interpreter_next (is);
}


/**
 * Run the command.
 *
 * @param cls closure.
 * @param cmd the command under execution.
 * @param is the interpreter state.
 */
static void
track_transfer_run (void *cls,
                    const struct TALER_TESTING_Command *cmd,
                    struct TALER_TESTING_Interpreter *is)
{
  /* looking for a wtid to track .. */
  struct TrackTransferState *tts = cls;
  struct TALER_WireTransferIdentifierRawP wtid;
  const struct TALER_WireTransferIdentifierRawP *wtid_ptr;

  tts->cmd = cmd;
  /* If no reference is given, we'll use a all-zeros
   * WTID */
  memset (&wtid,
          0,
          sizeof (wtid));
  wtid_ptr = &wtid;
  tts->is = is;
  if (NULL != tts->wtid_reference)
  {
    const struct TALER_TESTING_Command *wtid_cmd;

    wtid_cmd = TALER_TESTING_interpreter_lookup_command (tts->is,
                                                         tts->wtid_reference);
    if (NULL == wtid_cmd)
    {
      GNUNET_break (0);
      TALER_TESTING_interpreter_fail (tts->is);
      return;
    }

    if (GNUNET_OK !=
        TALER_TESTING_get_trait_wtid (wtid_cmd,
                                      &wtid_ptr))
    {
      GNUNET_break (0);
      TALER_TESTING_interpreter_fail (tts->is);
      return;
    }
    GNUNET_assert (NULL != wtid_ptr);
  }
  tts->tth = TALER_EXCHANGE_transfers_get (
    TALER_TESTING_interpreter_get_context (is),
    TALER_TESTING_get_exchange_url (is),
    TALER_TESTING_get_keys (is),
    wtid_ptr,
    &track_transfer_cb,
    tts);
  GNUNET_assert (NULL != tts->tth);
}


struct TALER_TESTING_Command
TALER_TESTING_cmd_track_transfer_empty (const char *label,
                                        const char *wtid_reference,
                                        unsigned int expected_response_code)
{
  struct TrackTransferState *tts;

  tts = GNUNET_new (struct TrackTransferState);
  tts->wtid_reference = wtid_reference;
  tts->expected_response_code = expected_response_code;
  {
    struct TALER_TESTING_Command cmd = {
      .cls = tts,
      .label = label,
      .run = &track_transfer_run,
      .cleanup = &track_transfer_cleanup
    };

    return cmd;
  }
}


struct TALER_TESTING_Command
TALER_TESTING_cmd_track_transfer (const char *label,
                                  const char *wtid_reference,
                                  unsigned int expected_response_code,
                                  const char *expected_total_amount,
                                  const char *expected_wire_fee)
{
  struct TrackTransferState *tts;

  tts = GNUNET_new (struct TrackTransferState);
  tts->wtid_reference = wtid_reference;
  tts->expected_response_code = expected_response_code;
  tts->expected_total_amount = expected_total_amount;
  tts->expected_wire_fee = expected_wire_fee;
  {
    struct TALER_TESTING_Command cmd = {
      .cls = tts,
      .label = label,
      .run = &track_transfer_run,
      .cleanup = &track_transfer_cleanup
    };

    return cmd;
  }
}


/* end of testing_api_cmd_gransfer_get.c */