/*
  This file is part of TALER
  Copyright (C) 2014-2018 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 exchange/test_exchange_api_twister.c
 * @brief testcase to test exchange's HTTP API interface
 * @author Marcello Stanisci
 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
 * @author Christian Grothoff
 */

#include "platform.h"
#include <taler/taler_util.h>
#include <taler/taler_signatures.h>
#include <taler/taler_exchange_service.h>
#include <taler/taler_json_lib.h>
#include <gnunet/gnunet_util_lib.h>
#include <microhttpd.h>
#include <taler/taler_bank_service.h>
#include <taler/taler_fakebank_lib.h>
#include <taler/taler_testing_lib.h>
#include <taler/taler_twister_testing_lib.h>
#include <taler/taler_twister_service.h>

/**
 * Configuration file we use.  One (big) configuration is used
 * for the various components for this test.
 */
#define CONFIG_FILE "test_exchange_api_twisted.conf"

/**
 * (real) Twister URL.  Used at startup time to check if it runs.
 */
static char *twister_url;

/**
 * URL of the fakebank.  Obtained from CONFIG_FILE's
 * "exchange-wire-test:BANK_URI" option.
 */
static char *fakebank_url;

/**
 * Exchange base URL.
 */
static char *exchange_url;

/**
 * Twister process.
 */
static struct GNUNET_OS_Process *twisterd;

/**
 * Account number of the exchange at the bank.
 */
#define EXCHANGE_ACCOUNT_NO 2

/**
 * Account number of some user.
 */
#define USER_ACCOUNT_NO 62

/**
 * User name. Never checked by fakebank.
 */
#define USER_LOGIN_NAME "user42"

/**
 * User password. Never checked by fakebank.
 */
#define USER_LOGIN_PASS "pass42"

/**
 * Execute the taler-exchange-wirewatch command with
 * our configuration file.
 *
 * @param label label to use for the command.
 */
#define CMD_EXEC_WIREWATCH(label) \
   TALER_TESTING_cmd_exec_wirewatch (label, CONFIG_FILE)

/**
 * Execute the taler-exchange-aggregator command with
 * our configuration file.
 *
 * @param label label to use for the command.
 */
#define CMD_EXEC_AGGREGATOR(label) \
   TALER_TESTING_cmd_exec_aggregator (label, CONFIG_FILE)

/**
 * Run wire transfer of funds from some user's account to the
 * exchange.
 *
 * @param label label to use for the command.
 * @param amount amount to transfer, i.e. "EUR:1"
 * @param url exchange_url
 */
#define CMD_TRANSFER_TO_EXCHANGE(label,amount) \
   TALER_TESTING_cmd_fakebank_transfer (label, amount, \
     fakebank_url, USER_ACCOUNT_NO, EXCHANGE_ACCOUNT_NO, \
     USER_LOGIN_NAME, USER_LOGIN_PASS, exchange_url)

/**
 * Run wire transfer of funds from some user's account to the
 * exchange.
 *
 * @param label label to use for the command.
 * @param amount amount to transfer, i.e. "EUR:1"
 */
#define CMD_TRANSFER_TO_EXCHANGE_SUBJECT(label,amount,subject) \
   TALER_TESTING_cmd_fakebank_transfer_with_subject \
     (label, amount, fakebank_url, USER_ACCOUNT_NO, \
      EXCHANGE_ACCOUNT_NO, USER_LOGIN_NAME, USER_LOGIN_PASS, \
      subject)

/**
 * Main function that will tell the interpreter what commands to
 * run.
 *
 * @param cls closure
 */
static void
run (void *cls,
     struct TALER_TESTING_Interpreter *is)
{

  struct TALER_TESTING_Command commands[] = {

    CMD_TRANSFER_TO_EXCHANGE
      ("refresh-create-reserve",
       "EUR:5.01"),

    /**
     * Make previous command effective.
     */
    CMD_EXEC_WIREWATCH
      ("wirewatch"),

    /**
     * Withdraw EUR:5.
     */
    TALER_TESTING_cmd_withdraw_amount
      ("refresh-withdraw-coin",
       is->exchange,
       "refresh-create-reserve",
       "EUR:5",
       MHD_HTTP_OK),

    TALER_TESTING_cmd_deposit
      ("refresh-deposit-partial",
       is->exchange,
       "refresh-withdraw-coin",
       0,
       TALER_TESTING_make_wire_details
         (42,
          fakebank_url),
       "{\"items\":[{\"name\":\"ice cream\",\
                     \"value\":\"EUR:1\"}]}",
       GNUNET_TIME_UNIT_ZERO,
       "EUR:1",
       MHD_HTTP_OK),

    /**
     * Melt the rest of the coin's value
     * (EUR:4.00 = 3x EUR:1.03 + 7x EUR:0.13) */
    TALER_TESTING_cmd_refresh_melt
      ("refresh-melt",
       is->exchange,
       "EUR:4",
       "refresh-withdraw-coin",
       MHD_HTTP_OK),

    /* Trigger 409 Conflict.  */
    TALER_TESTING_cmd_flip_upload
      ("flip-upload",
       CONFIG_FILE,
       "transfer_privs.0"),

    TALER_TESTING_cmd_refresh_reveal
      ("refresh-(flipped-)reveal",
       is->exchange,
       "refresh-melt",
       MHD_HTTP_CONFLICT),

       /* Next chunk, refund conflicts
       
         (contract hash missmatch [!],
          original deposit does not exist V,
          currency missmatch) V;
          
          'refund_transaction()' has many of the relevant cases;
       */

    CMD_TRANSFER_TO_EXCHANGE
      ("create-reserve-r1",
       "EUR:5.01"),

    CMD_EXEC_WIREWATCH
      ("wirewatch-r1"),

    TALER_TESTING_cmd_withdraw_amount
      ("withdraw-coin-r1",
       is->exchange,
       "create-reserve-r1",
       "EUR:5",
       MHD_HTTP_OK),

    TALER_TESTING_cmd_deposit
      ("deposit-refund-1",
       is->exchange,
       "withdraw-coin-r1",
       0,
       TALER_TESTING_make_wire_details
         (42,
          fakebank_url),
       "{\"items\":[{\"name\":\"ice cream\","
                    "\"value\":\"EUR:5\"}]}",
       GNUNET_TIME_UNIT_MINUTES,
       "EUR:5",
       MHD_HTTP_OK),

    TALER_TESTING_cmd_refund
      ("refund-currency-missmatch",
       MHD_HTTP_PRECONDITION_FAILED,
       "USD:5",
       "USD:0.01",
       "deposit-refund-1"),

    TALER_TESTING_cmd_refund
      ("refund-fee-above-amount",
       MHD_HTTP_BAD_REQUEST,
       "EUR:5",
       "EUR:10",
       "deposit-refund-1"),

    TALER_TESTING_cmd_flip_upload
      ("flip-upload",
       CONFIG_FILE,
       "merchant_sig"),

    TALER_TESTING_cmd_refund
      ("refund-bad-sig",
       MHD_HTTP_UNAUTHORIZED,
       "EUR:5",
       "EUR:0.01",
       "deposit-refund-1"),

    /* This deposit CMD is used to provide "good" traits
     * to the next refund CMD, where 'good' means that the
     * POST /refund will pass the signature verification,
     * but the handler will then NOT judge the deposit as
     * refundable - actually it won't be found since it will
     * fail as double-spending attempt.  */

    TALER_TESTING_cmd_deposit
      ("deposit-refund-to-fail",
       is->exchange,
       "withdraw-coin-r1",
       0, /* coin index.  */
       TALER_TESTING_make_wire_details
         (42,
          fakebank_url),
       /* This parameter will make any comparison about
          h_contract_terms fail, when /refund will be handled.
          So in other words, this is h_contract missmatch.  */
       "{\"items\":[{\"name\":\"ice skate\","
                    "\"value\":\"EUR:5\"}]}",
       GNUNET_TIME_UNIT_MINUTES,
       "EUR:5",
       MHD_HTTP_FORBIDDEN),

    TALER_TESTING_cmd_refund
      ("refund-deposit-not-found",
       MHD_HTTP_NOT_FOUND,
       "EUR:5",
       "EUR:0.01",
       "deposit-refund-to-fail"),

    TALER_TESTING_cmd_refund
      ("refund-insufficient-funds",
       MHD_HTTP_PRECONDITION_FAILED,
       "EUR:50",
       "EUR:0.01",
       "deposit-refund-1"),

    TALER_TESTING_cmd_refund
      ("refund-fee-too-low",
       MHD_HTTP_BAD_REQUEST,
       "EUR:5",
       "EUR:0.000001",
       "deposit-refund-1"),

    TALER_TESTING_cmd_end ()
  };

  TALER_TESTING_run_with_fakebank (is,
                                   commands,
                                   fakebank_url);
}

/**
 * Kill, wait, and destroy convenience function.
 *
 * @param process process to purge.
 */
static void
purge_process (struct GNUNET_OS_Process *process)
{
  GNUNET_OS_process_kill (process, SIGINT);
  GNUNET_OS_process_wait (process);
  GNUNET_OS_process_destroy (process);
}

int
main (int argc,
      char * const *argv)
{
  unsigned int ret;
  /* These environment variables get in the way... */
  unsetenv ("XDG_DATA_HOME");
  unsetenv ("XDG_CONFIG_HOME");
  GNUNET_log_setup ("test-exchange-api-new-twisted",
                    "DEBUG", NULL);

  if (NULL == (fakebank_url = TALER_TESTING_prepare_fakebank
               (CONFIG_FILE,
                "account-2")))
    return 77;

  if (NULL == (twister_url = TALER_TESTING_prepare_twister
      (CONFIG_FILE)))
    return 77;

  TALER_TESTING_cleanup_files (CONFIG_FILE);

  switch (TALER_TESTING_prepare_exchange (CONFIG_FILE,
                                          &exchange_url))
  {
  case GNUNET_SYSERR:
    GNUNET_break (0);
    return 1;
  case GNUNET_NO:
    return 77;

  case GNUNET_OK:

    if (NULL == (twisterd = TALER_TESTING_run_twister
        (CONFIG_FILE)))
      return 77;

    ret = TALER_TESTING_setup_with_exchange (&run, NULL,
                                             CONFIG_FILE);
    purge_process (twisterd);
    GNUNET_free (twister_url);

    if (GNUNET_OK != ret)
      return 1;
    break;
  default:
    GNUNET_break (0);
    return 1;
  }
  return 0;
}

/* end of test_exchange_api_twisted.c */