<?php
// *** IBM Hyperledger anchoring demo ***
// Don't use external modules
// Can work with remote EMC-wallet, all data exchange by JSON only
//

// Show errors right in browser
error_reporting(E_ALL);
ini_set('display_errors', 'on');

// Export here connect variable, like:
// $emcCONNECT = "http://user:secret_pass@localhost:8775";
include("testnet-config-lite.php");

//------------------------------------------------------------------------------
$anchor = "ibm:demo-anchor";

# 4 pseudh-hashes in Gray code
$demo_hashes = array('hash0000', 'hash0001', 'hash0011', 'hash0010');

//------------------------------------------------------------------------------

// Performs NVS-request to EMC wallet
function emc_NVS_req($method, $params) {
  global $emcCONNECT;
  // Prepares the request
  $request = json_encode(array(
    'method' => $method,
    'params' => $params,
    'id' => '1'
  ));
  // Prepare and performs the HTTP POST
  $opts = array ('http' => array (
    'method'  => 'POST',
    'header'  => 'Content-type: application/json',
    'content' => $request
  ));
  $fp = fopen($emcCONNECT, 'rb', false, stream_context_create($opts));
  if(!$fp) 
    throw new Exception('emcssl_NVS_req: Unable to connect to EMC-wallet');

  $rc = json_decode(stream_get_contents($fp), true);
  $er = $rc['error'];
  if(!is_null($er)) 
    throw new Exception('emcssl_NVS_req: Response error: ' . $er);

  return $rc['result'];
} // emc_NVS_req
 
//------------------------------------------------------------------------------

// Create initial Anchor name
$rc = emc_NVS_req('name_new', array($anchor, 'Demo anchor', 100));
echo "Created Anchor $anchor with transaction=$rc\n";

# Anchoring demo hashes to the Emercoin blockchain every hour
foreach ($demo_hashes as $hash) {
  sleep(3600);
  $rc = emc_NVS_req('name_update', array($anchor, $hash, 100));
  echo "Added anchor hash $hash to $anchor with transaction=$rc\n";
}

?>