/*
  This file is part of TALER
  Copyright (C) 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_api_cmd_get_instance.c
 * @brief command to test GET /instance/$ID
 * @author Christian Grothoff
 */
#include "platform.h"
#include <taler/taler_exchange_service.h>
#include <taler/taler_testing_lib.h>
#include "taler_merchant_service.h"
#include "taler_merchant_testing_lib.h"


/**
 * Details about a merchant's bank account.
 */
struct MERCHANT_Account
{
  /**
   * salt used to compute h_wire
   */
  struct TALER_WireSaltP salt;

  /**
   * payto:// URI of the account.
   */
  char *payto_uri;

  /**
   * Credit facade URL of the account.
   */
  char *credit_facade_url;

  /**
   * Hash of @e payto_uri and @e salt.
   */
  struct TALER_MerchantWireHashP h_wire;

  /**
   * true if the account is active,
   * false if it is historic.
   */
  bool active;
};


/**
 * State of a "GET instance" CMD.
 */
struct GetInstanceState
{

  /**
   * Handle for a "GET instance" request.
   */
  struct TALER_MERCHANT_InstanceGetHandle *igh;

  /**
   * The interpreter state.
   */
  struct TALER_TESTING_Interpreter *is;

  /**
   * Base URL of the merchant serving the request.
   */
  const char *merchant_url;

  /**
   * ID of the instance to run GET for.
   */
  const char *instance_id;

  /**
   * Reference for a POST or PATCH /instances CMD (optional).
   */
  const char *instance_reference;

  /**
   * Whether we should check the instance's accounts or not.
   */
  bool cmp_accounts;

  /**
   * The accounts of the merchant we expect to be active.
   */
  const char **active_accounts;

  /**
   * The length of @e active_accounts.
   */
  unsigned int active_accounts_length;

  /**
   * The accounts of the merchant we expect to be inactive.
   */
  const char **inactive_accounts;

  /**
   * Length of the @e accounts array.
   */
  unsigned int accounts_length;

  /**
   * Array of @e accounts_length bank accounts of the merchant instance as
   * returned by the request.
   */
  struct MERCHANT_Account *accounts;

  /**
   * The length of @e inactive_accounts.
   */
  unsigned int inactive_accounts_length;

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

};


/**
 * Callback for a /get/instance/$ID operation.
 *
 * @param cls closure for this function
 * @param igr response
 */
static void
get_instance_cb (void *cls,
                 const struct TALER_MERCHANT_InstanceGetResponse *igr)
{
  struct GetInstanceState *gis = cls;
  const struct TALER_TESTING_Command *instance_cmd;

  instance_cmd = TALER_TESTING_interpreter_lookup_command (
    gis->is,
    gis->instance_reference);

  gis->igh = NULL;
  if (gis->http_status != igr->hr.http_status)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u (%d) to command %s\n",
                igr->hr.http_status,
                (int) igr->hr.ec,
                TALER_TESTING_interpreter_get_current_label (gis->is));
    TALER_TESTING_interpreter_fail (gis->is);
    return;
  }
  switch (igr->hr.http_status)
  {
  case MHD_HTTP_OK:
    {
      const struct TALER_MERCHANT_InstanceDetails *details =
        &igr->details.ok.details;

      gis->accounts_length = igr->details.ok.accounts_length;
      gis->accounts = GNUNET_new_array (gis->accounts_length,
                                        struct MERCHANT_Account);
      for (unsigned int i = 0; i<gis->accounts_length; i++)
      {
        const struct TALER_MERCHANT_Account *src = &igr->details.ok.accounts[i];
        struct MERCHANT_Account *dst = &gis->accounts[i];

        dst->salt = src->salt;
        dst->payto_uri = GNUNET_strdup (src->payto_uri);
        if (NULL != src->credit_facade_url)
          dst->credit_facade_url = GNUNET_strdup (src->credit_facade_url);
        dst->h_wire = src->h_wire;
        dst->active = src->active;
      }
      {
        const char *name;

        if (GNUNET_OK !=
            TALER_TESTING_get_trait_instance_name (instance_cmd,
                                                   &name))
          TALER_TESTING_interpreter_fail (gis->is);
        if (0 != strcmp (details->name,
                         name))
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Instance name does not match: Got `%s', wanted `%s'\n",
                      details->name,
                      name);
          TALER_TESTING_interpreter_fail (gis->is);
          return;
        }
      }
      {
        const json_t *address;

        if (GNUNET_OK !=
            TALER_TESTING_get_trait_address (instance_cmd,
                                             &address))
          TALER_TESTING_interpreter_fail (gis->is);
        if (1 != json_equal (details->address,
                             address))
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Instance address does not match\n");
          TALER_TESTING_interpreter_fail (gis->is);
          return;
        }
      }
      {
        const json_t *jurisdiction;

        if (GNUNET_OK !=
            TALER_TESTING_get_trait_jurisdiction (instance_cmd,
                                                  &jurisdiction))
          TALER_TESTING_interpreter_fail (gis->is);
        if (1 != json_equal (details->jurisdiction,
                             jurisdiction))
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Instance jurisdiction does not match\n");
          TALER_TESTING_interpreter_fail (gis->is);
          return;
        }
      }
      {
        const bool *use_stefan;

        if (GNUNET_OK !=
            TALER_TESTING_get_trait_use_stefan (instance_cmd,
                                                &use_stefan))
          TALER_TESTING_interpreter_fail (gis->is);
        if (*use_stefan != details->use_stefan)
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Instance use_stefan value does not match\n");
          TALER_TESTING_interpreter_fail (gis->is);
          return;
        }
      }
      {
        const struct GNUNET_TIME_Relative *default_wire_transfer_delay;

        if (GNUNET_OK !=
            TALER_TESTING_get_trait_wire_delay (instance_cmd,
                                                &default_wire_transfer_delay))
          TALER_TESTING_interpreter_fail (gis->is);
        if (details->default_wire_transfer_delay.rel_value_us !=
            default_wire_transfer_delay->rel_value_us)
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Instance default wire transfer delay does not match\n");
          TALER_TESTING_interpreter_fail (gis->is);
          return;
        }
      }
      {
        const struct GNUNET_TIME_Relative *default_pay_delay;

        if (GNUNET_OK !=
            TALER_TESTING_get_trait_pay_delay (instance_cmd,
                                               &default_pay_delay))
          TALER_TESTING_interpreter_fail (gis->is);
        if (details->default_pay_delay.rel_value_us !=
            default_pay_delay->rel_value_us)
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Instance default pay delay does not match\n");
          TALER_TESTING_interpreter_fail (gis->is);
          return;
        }
      }
      /* We aren't guaranteed an order for the accounts, so we just have to check
         that we can match each account returned with exactly one account
         expected. */
      if (gis->cmp_accounts)
      {
        unsigned int have_al = igr->details.ok.accounts_length;
        unsigned int expected_accounts_length =
          gis->active_accounts_length + gis->inactive_accounts_length;
        unsigned int matches[GNUNET_NZL (have_al)];

        if (have_al != expected_accounts_length)
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Accounts length does not match\n");
          TALER_TESTING_interpreter_fail (gis->is);
          return;
        }

        memset (matches,
                0,
                sizeof (matches));

        /* Compare the accounts */
        for (unsigned int i = 0; i < have_al; ++i)
        {
          const struct TALER_MERCHANT_Account *account
            = &igr->details.ok.accounts[i];
          for (unsigned int j = 0; j < gis->active_accounts_length; ++j)
          {
            if ((0 == strcasecmp (account->payto_uri,
                                  gis->active_accounts[j])) &&
                account->active)
            {
              matches[i] += 1;
            }
          }
          for (unsigned int j = 0; j < gis->inactive_accounts_length; ++j)
          {
            if ((0 == strcasecmp (account->payto_uri,
                                  gis->inactive_accounts[j])) &&
                (! account->active))
            {
              matches[i] += 1;
            }
          }
        }

        // Each account should have exactly one match.
        for (unsigned int i = 0; i < have_al; ++i)
        {
          if (1 != matches[i])
          {
            GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                        "Instance account does not match\n");
            TALER_TESTING_interpreter_fail (gis->is);
            return;
          }
        }
      }
    }
    break;
  case MHD_HTTP_UNAUTHORIZED:
    break;
  case MHD_HTTP_NOT_FOUND:
    break;
  default:
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Unhandled HTTP status %u for GET instance ID.\n",
                igr->hr.http_status);
  }
  TALER_TESTING_interpreter_next (gis->is);
}


/**
 * Run the "GET instance" CMD.
 *
 *
 * @param cls closure.
 * @param cmd command being run now.
 * @param is interpreter state.
 */
static void
get_instance_run (void *cls,
                  const struct TALER_TESTING_Command *cmd,
                  struct TALER_TESTING_Interpreter *is)
{
  struct GetInstanceState *gis = cls;

  gis->is = is;
  gis->igh = TALER_MERCHANT_instance_get (
    TALER_TESTING_interpreter_get_context (is),
    gis->merchant_url,
    gis->instance_id,
    &get_instance_cb,
    gis);
  GNUNET_assert (NULL != gis->igh);
}


/**
 * Free the state of a "GET instance" CMD, and possibly
 * cancel a pending operation thereof.
 *
 * @param cls closure.
 * @param cmd command being run.
 */
static void
get_instance_cleanup (void *cls,
                      const struct TALER_TESTING_Command *cmd)
{
  struct GetInstanceState *gis = cls;

  if (NULL != gis->igh)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "GET /instances/$ID operation did not complete\n");
    TALER_MERCHANT_instance_get_cancel (gis->igh);
  }
  for (unsigned int i = 0; i<gis->accounts_length; i++)
  {
    struct MERCHANT_Account *acc = &gis->accounts[i];

    GNUNET_free (acc->payto_uri);
    GNUNET_free (acc->credit_facade_url);
  }
  GNUNET_free (gis->accounts);
  GNUNET_free (gis);
}


/**
 * Offers information from the GET /instance/$ID CMD state to other
 * commands.
 *
 * @param cls closure
 * @param[out] ret result (could be anything)
 * @param trait name of the trait
 * @param index index number of the object to extract.
 * @return #GNUNET_OK on success
 */
static enum GNUNET_GenericReturnValue
get_instance_traits (void *cls,
                     const void **ret,
                     const char *trait,
                     unsigned int index)
{
  struct GetInstanceState *pps = cls;

  if (index < pps->accounts_length)
  {
    struct TALER_TESTING_Trait traits[] = {
      TALER_TESTING_make_trait_merchant_base_url (pps->merchant_url),
      TALER_TESTING_make_trait_h_wires (
        index,
        &pps->accounts[index].h_wire),
      TALER_TESTING_make_trait_payto_uris (
        index,
        pps->accounts[index].payto_uri),
      TALER_TESTING_trait_end (),
    };

    return TALER_TESTING_get_trait (traits,
                                    ret,
                                    trait,
                                    index);
  }
  else
  {
    struct TALER_TESTING_Trait traits[] = {
      TALER_TESTING_make_trait_merchant_base_url (pps->merchant_url),
      TALER_TESTING_trait_end (),
    };

    return TALER_TESTING_get_trait (traits,
                                    ret,
                                    trait,
                                    index);
  }
}


struct TALER_TESTING_Command
TALER_TESTING_cmd_merchant_get_instance (const char *label,
                                         const char *merchant_url,
                                         const char *instance_id,
                                         unsigned int http_status,
                                         const char *instance_reference)
{
  struct GetInstanceState *gis;

  gis = GNUNET_new (struct GetInstanceState);
  gis->merchant_url = merchant_url;
  gis->instance_id = instance_id;
  gis->http_status = http_status;
  gis->instance_reference = instance_reference;
  gis->cmp_accounts = false;
  {
    struct TALER_TESTING_Command cmd = {
      .cls = gis,
      .label = label,
      .run = &get_instance_run,
      .cleanup = &get_instance_cleanup,
      .traits = &get_instance_traits
    };

    return cmd;
  }
}


struct TALER_TESTING_Command
TALER_TESTING_cmd_merchant_get_instance2 (const char *label,
                                          const char *merchant_url,
                                          const char *instance_id,
                                          unsigned int http_status,
                                          const char *instance_reference,
                                          const char *active_accounts[],
                                          unsigned int active_accounts_length,
                                          const char *inactive_accounts[],
                                          unsigned int inactive_accounts_length)
{
  struct GetInstanceState *gis;

  gis = GNUNET_new (struct GetInstanceState);
  gis->merchant_url = merchant_url;
  gis->instance_id = instance_id;
  gis->http_status = http_status;
  gis->instance_reference = instance_reference;
  gis->cmp_accounts = true;
  gis->active_accounts = active_accounts;
  gis->active_accounts_length = active_accounts_length;
  gis->inactive_accounts = inactive_accounts;
  gis->inactive_accounts_length = inactive_accounts_length;
  {
    struct TALER_TESTING_Command cmd = {
      .cls = gis,
      .label = label,
      .run = &get_instance_run,
      .cleanup = &get_instance_cleanup,
      .traits = &get_instance_traits
    };

    return cmd;
  }
}


/* end of testing_api_cmd_get_instance.c */