<?php
/*
  This file is part of GNU 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 Lesser General Public License as published by the Free Software
  Foundation; either version 2.1, 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 Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License along with
  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
*/

  include("../frontend_lib/merchants.php");
  include("../frontend_lib/util.php");
  include("../frontend_lib/config.php");
  include("./blog_lib.php");
  $article = get($_GET['article']);
  if (null == $article){
    echo "Please land here just to buy articles";
    die();
    }
  // send contract
  $transaction_id = rand(0, 1001);
  $now = new DateTime('now');
  $teaser = get_title($article);
  $amount_value = 0;
  $amount_fraction = 50000;
  $teatax = array ();
  $transaction_id = rand(0, 1001);
  $fulfillment_url = url_rel("essay_fulfillment.php")
    . '&timestamp=' . $now->getTimestamp()
    . '&tid=' . $transaction_id;
  $contract_json = generate_contract($amount_value,
                                     $amount_fraction,
                                     $MERCHANT_CURRENCY,
  				     $transaction_id,
  				     trim($teaser),
  				     $article,
  				     $article,
  				     $teatax,
  				     $now,
  				     $fulfillment_url);
  $resp = give_to_backend($_SERVER['HTTP_HOST'],
                          "backend/contract",
  	                  $contract_json);
  $status_code = $resp->getResponseCode();
  http_response_code ($status_code);
  if ($status_code != 200){
    echo json_encode(array(
      'error' => "internal error",
      'hint' => "backend indicated error",
      'detail' => $resp->body->toString()
    ), JSON_PRETTY_PRINT);
  }
  else {
    $got_json = json_decode($resp->body->toString(), true);
    $hc = $got_json["H_contract"];
    session_start();
    $payments = &pull($_SESSION, "payments", array());
    $payments[$article] = array("ispayed" => false);
    log_string("ctr ".article_state_to_str($payments[$article]));
    echo $resp->body->toString();
  }
?>