<?php 
/*
  This file is part of GNU TALER.
  Copyright (C) 2014-2016 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/util.php';

session_start();

if (!isset($_SESSION['receiver']))
{
  http_response_code(400);
  die();
}

$receiver = $_SESSION['receiver'];
$amount_value = intval($_SESSION['amount_value']);
$amount_fraction = intval($_SESSION['amount_fraction']);
$currency = $_SESSION['currency'];

/* Fill in variables for simple JSON contract */
// fake product id 
$p_id = rand(0,1001);

// generate a front-end transaction id. 
// In production context, we might want to
// record this value somewhere together
// with the rest of the contract data.
$transaction_id = rand(0, 1001);

// Human-readable description of this deal
$desc = "Donation to " . $receiver;

// The tax for this deal
$teatax = array('value' => 1,
                'fraction' => 0,
                'currency' => $currency);

// Take a timestamp
$now = new DateTime('now');


// Include all information so we can
// restore the contract without storing it
$fulfillment_url = url_rel("fulfillment.php")
  . '?uuid=${H_contract}'
  . '&receiver=' . urlencode($receiver)
  . '&aval=' . urlencode($amount_value)
  . '&afrac=' . urlencode($amount_fraction)
  . '&acurr=' . urlencode($currency)
  . '&tid=' . $transaction_id;

// pack the JSON for the contract 
$contract = array(
  'fulfillment_url' => $fulfillment_url,
  'amount' => array(
    'value' => $amount_value,
    'fraction' => $amount_fraction,
    'currency' => $currency),
  'max_fee' => array(
    'value' => 3,
    'fraction' => 01010,
    'currency' => $currency),
  'transaction_id' => $transaction_id,
  'products' => array(
    array(
      'description' => $desc,
      'quantity' => 1,
      'price' => array ('value' => $amount_value,
      'fraction' => $amount_fraction,
      'currency' => $currency),
      'product_id' => $p_id,
      'taxes' => array(array('teatax' => $teatax)),
      'delivery_date' => "Some Date Format",
      'delivery_location' => 'LNAME1')),
  'timestamp' => "/Date(" . $now->getTimestamp() . ")/",
  'expiry' => "/Date(" . $now->add(new DateInterval('P2W'))->getTimestamp() . ")/",
  'refund_deadline' => "/Date(" . $now->add(new DateInterval('P3M'))->getTimestamp() . ")/",
  'merchant' => array(
    'address' => 'LNAME2',
    'name' => 'test merchant',
    'jurisdiction' => 'LNAME3'),
  'locations' => array(
    'LNAME1' => array(
      'country' => 'Test Country',
      'city' => 'Test City',
      'state' => 'Test State',
      'region' => 'Test Region',
      'province' => 'Test Province',
      'ZIP code' => 4908,
      'street' => 'test street',
      'street number' => 20),
    'LNAME2' => array(
      'country' => 'Test Country',
      'city' => 'Test City',
      'state' => 'Test State',
      'region' => 'Test Region',
      'province' => 'Test Province',
      'ZIP code' => 4908,
      'street' => 'test street',
      'street number' => 20),
    'LNAME3' => array(
      'country' => 'Test Country',
      'city' => 'Test City',
      'state' => 'Test State',
      'region' => 'Test Region',
      'province' => 'Test Province',
      'ZIP code' => 4908)));

$json = json_encode(array(
  'contract' => $contract
), JSON_PRETTY_PRINT);

$url = url_join("http://".$_SERVER["HTTP_HOST"], "backend/contract");

$req = new http\Client\Request("POST",
                               $url,
                               array ("Content-Type" => "application/json"));

$req->getBody()->append($json);

// Execute the HTTP request
$client = new http\Client;
$client->enqueue($req)->send();

// Fetch the response
$resp = $client->getResponse();
$status_code = $resp->getResponseCode();

// Our response code is the same we got from the backend:
http_response_code($status_code);

// Now generate our body  
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"];

  $payments = &pull($_SESSION, "payments", array());
  $payments[$hc] = array(
    'receiver' => $receiver,
  );

  echo json_encode ($got_json, JSON_PRETTY_PRINT);
}
?>