gistfile1.txt

<?php


/**
 *
 */
function api_payment_form_get($params) {
  $paymentProcessor = civicrm_api3('payment_processor', 'getsingle', array('processor_id' => $params['processor_id']));
  $formData = paymentFormBuild($paymentProcessor, $params);
  if ($params['output'] = 'json') {
    return json_encode($formData);
  }
  return generateHTML($formData);
}

function paymentFormBuild($paymentProcessor, $params) {
  $gateway = Omnipay::create(str_replace('omnipay_', '', $paymentProcessor['name']));
  if (!empty($params['country'])) {
    $gateway->setCountry($params['country']);
  }
  if (!empty($params['currency'])) {
    $gateway->setCurrency($params['currency']);
  }
  $gateWayFields = $gateway->getSuggestedFields();
  //this is civicentric - if the form builder were standalone this would need to be a hookable/ extendable call
  $configuredFields = civicrm_api('profile', 'getfields', array('profile_id' => 'billing', 'action' => 'submit'));
  $billingFields = array_merge(array_fill_keys($gateWayFields, $configuredFields);
  $billingFieldsWithMetadata = addMetaData($billingFields);
  $submitURL = '';
  if ($gateway->isTransactionalRedirect) {
    $submitURL = $gateway->getSubmitURL();
  }
  return array('submit' => $submitURL, 'fields' => $billingFieldsWithMetadata);
 }

function addMetaData($billingFields) {
  foreach ($billingFields as $key => $field) {
    if (!is_array($field)) {
      $billingFields[$key] = lookupMetadata($key);
    }
    $billingFields['class'][] = 'gateway';
    if ($billingFields['is_sensitive']) {
      $billingFields['class'][] = 'billing-profile';
    }

  }
  return $billingFields;
}

function lookupMetadata($key) {
  // here we need to look up a library of possible fields to fill in metadata about field length, whether it is select, options
  // & possibly any validation or js classes
  // & have a default of text of medium length
}
function generateHTML() {
  // call a generic api level function that can turn a form array into html. This would be tested & would largely not care if it the form architecture
  // changes
}