<?php

/**
 * @file
 * Functions for stripe payment integration
 * @see https://github.com/ericthelast/drupal-stripe-form and https://www.webomelette.com/drupal-stripe-integration
 */

 /**
 * Get the current stripe api public key
 */
function _booking_get_stripe_public_key() {
    if (variable_get('booking_stripe_testmode', 0) == 1) {
        return variable_get('booking_stripe_test_public_key', '');
    }
    else {
        return variable_get('booking_stripe_live_public_key', '');
    }
}

/**
 * Get the current stripe api private key
 */
function _booking_get_stripe_private_key() {
    if (variable_get('booking_stripe_testmode', 0) == 1) {
        return variable_get('booking_stripe_test_secret_key', '');
    }
    else {
        return variable_get('booking_stripe_live_secret_key', '');
    }    
}

/**
 * Sample Stripe Form.
 */
function booking_stripeform_form($form, &$form_state) {

  // Let's make sure you have the stripe library installed.
  if($path = libraries_get_path('stripe-php-latest')) {
    if(!is_file($path . '/lib/Stripe.php')) {
      form_set_error('form', t('You need to install the stripe library from !link before you can use this form.', array('!link' => l('here', 'https://stripe.com/docs/libraries'))));
    }
  } else {
    form_set_error('form', t('You need to install the stripe library from !link before you can use this form.', array('!link' => l('here', 'https://stripe.com/docs/libraries'))));
  }

  $setting = array();
  $setting['booking_stripeform'] = array(
    'pubkey' => _booking_get_stripe_public_key(),
    'form_selector' => str_replace('_', '-', __FUNCTION__),
  );

  $form['#attached'] = array(
    'js' => array(
      array('data' => $setting, 'type' => 'setting'),
    ),
    'library' => array(
      array('booking', 'booking.stripe'),
    ),
  );

  $form['stripeToken'] = array(
    '#type' => 'hidden',
    '#value' => !empty($form_state['input']['stripeToken']) ? $form_state['input']['stripeToken'] : NULL,
  );

  $form['amount'] = array(
    '#type' => 'textfield',
    '#title' => t('Amount to charge'),
    '#description' => t('NOTE: Normally, you would calculate amount on the back end unless the user really can choose their own amount'),
    '#size' => 6,
    '#required' => TRUE,
  );

  $form['credit_card'] = array(
    '#type' => 'fieldset',
    '#title' => t('Credit Card Information'),
  );

  $cc = &$form['credit_card'];

  $cc['card_number'] = array(
    '#type' => 'textfield',
    '#title' => t('Credit Card Number'),
    '#pre_render' => array('booking_stripeform_remove_name'),
    '#attributes' => array(
      'size' => 20,
      'data-stripe' => 'number',
    ),
  );

  $cc['exp_month'] = array(
    '#type' => 'select',
    '#title' => t('Expiration Month'),
    '#options' => drupal_map_assoc(array(1,2,3,4,5,6,7,8,9,10,11,12)),
    '#pre_render' => array('booking_stripeform_remove_name'),
    '#attributes' => array(
      'data-stripe' => 'exp-month',
    ),
    '#empty_option' => t('- Select -'),
  );

  $cc['exp_year'] = array(
    '#type' => 'select',
    '#title' => t('Expiration Year'),
    '#options' => array(),
    '#pre_render' => array('booking_stripeform_remove_name'),
    '#attributes' => array(
      'data-stripe' => 'exp-year',
    ),
    '#empty_option' => t('- Select -'),
  );

  $year = date('Y');
  for($i = $year; $i <= ($year + 10); $i++) {
    $cc['exp_year']['#options'][$i] = $i;
  }

  $cc['cvc'] = array(
    '#type' => 'textfield',
    '#title' => t('CVC Number'),
    '#pre_render' => array('booking_stripeform_remove_name'),
    '#attributes' => array(
      'size' => 4,
      'data-stripe' => 'cvc',
    ),
  );

  $cc['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Charge It'),
    '#attributes' => array(
      'class' => array('btn', 'btn-large', 'btn-primary'),
    ),
  );

  // Adds our validation at the end of the build process.
  $form['#after_build'][] = 'booking_stripeform_add_final_validation';

  return $form;
}

/**
 * Tries to add final validation after all else has been added through alters.
 */
function booking_stripeform_add_final_validation($form) {
  $form['#validate'][] = 'stripeform_validate_form_payment';
  return $form;
}

/**
 * Form validation callback.
 */
function booking_stripeform_checkout_form_validate($form, &$form_state) {
  // Validate normal form elements as needed.
}

/**
 * Processes the stripe payment.
 *
 * We do this here so that if the payment fails,
 * we're still in a validation stage and can return
 * early.  If success, we'll pass the charge on
 * to the submission callback.
 */
function booking_stripeform_validate_form_payment($form, &$form_state) {
  if($errors = form_get_errors()) {
    return;
  }
  $path = libraries_get_path('stripe-php-latest');
  require_once($path . '/lib/Stripe.php');

  Stripe::setApiKey(STRIPEFORM_PRIVATE_KEY);

  $token = $form_state['values']['stripeToken'];
  $amount = $form_state['values']['amount'] * 100;

  // Create the charge on Stripe's servers - this will charge the user's card
  try {
    $charge = Stripe_Charge::create(array(
      "amount" => $amount,
      "currency" => "usd",
      "card" => $token,
      "description" => 'test charge',
    ));
    
    $form_state['stripeform_charge'] = $charge;
  } catch(Stripe_CardError $e) {
     // The card has been declined
     watchdog('stripeform', $e->getMessage());
     form_set_error('form', $e->getMessage());
  }
}

/**
 * Form submission handler.
 */
function booking_stripeform_form_submit($form, &$form_state) {
  drupal_set_message('Charge successful!');
}

/**
 * FAPI #pre_render callback.
 *
 * Removes the name field form a form element.
 */
function booking_stripeform_remove_name($element) {
  unset($element['#name']);
  return $element;
}