<?php
// $Id$

/**
 * @file
 * Makes the review button on the Ubercart checkout page optional (set by store admin).
 *
 * Original author: Oliver Coleman, oliver@e-geek.com.au
 */

/**
 * Custom submit handler for uc_cart_checkout_form().
 * @see uc_optional_checkout_review_form_alter()
 *
 * Make sure checkout validated properly before skipping checkout review.
 */
function uc_optional_checkout_review_form_submit($form, &$form_state) {
  // If the normal submit handler set do_review then call the review
  // form submit function.
  if ($_SESSION['do_review'] && $form_state['redirect'] == 'cart/checkout/review') {
    // Clear the previous redirect because we're going to override it anyway.
    unset($form_state['redirect']);

    // Cause the review form to be loaded because some modules may
    // do some of their processing here.
    uc_cart_checkout_review();

    $order = uc_order_load($_SESSION['cart_order']);
    if ($order->payment_method == 'paypal_wps') {
      $wps_form = uc_paypal_wps_form($form_state, $order);
      $wps_url = $wps_form['#action'] . '?';
      foreach (element_children($wps_form) as $key) {
        $wps_url .= urlencode($key) . '=' . urlencode($wps_form[$key]['#value']) . '&';
      }      
      $wps_url = trim($wps_url, '&');
      drupal_goto($wps_url);
    }
    else {
      // Now submit the form.  Obviously the $form_state isn't actually
      // correct... hopefully nothing will care.
      uc_cart_checkout_review_form_submit($form, $form_state);
  
      // And check for an error.
      if ($form_state['redirect'] == 'cart/checkout/review') {
        // There's an error, so pretend the user clicked back.
        uc_cart_checkout_review_form_back($form, $form_state);
      }
    }

    // Ultimately the $form_state changes made by functions above are used.
  }
  elseif ($form_state['redirect'] != 'cart/checkout') {
    // Log any unexpected URLs in 'redirect'.
    watchdog('uc_cart', 'Checkout returned unexpected destination url: %url',
      array('%url' => $form_state['redirect']), WATCHDOG_DEBUG);
  }
}

/**
 * Implementation of hook_form_alter().
 *
 * Changes text on review order button to submit order and adds our custom submit function.
 * Adds a "Skip checkout review" option to checkout settings form.
 */
function uc_optional_checkout_review_form_alter(&$form, $form_state, $form_id) {
  switch ($form_id) {
    case 'uc_cart_checkout_form':
      if (variable_get('uc_checkout_skip_review', FALSE)) {
        // Change the submit button label.
        $form['continue']['#value'] = variable_get('uc_checkout_submit_button', t('Submit order'));

        // Add our submit handler.
        $form['#submit'][] = 'uc_optional_checkout_review_form_submit';
        // And add our JavaScript file to handle this submit button.
        drupal_add_js(drupal_get_path('module', 'uc_optional_checkout_review') .'/uc_optional_checkout_review.js');
        // Add the uc_cart css, since it contains the throbber styles that we are using in the JavaScript.
        drupal_add_css(drupal_get_path('module', 'uc_cart') .'/uc_cart.css');
      }
      break;

    case 'uc_cart_checkout_settings_form':
      // Add a checkbox for enabling this module.
      $form['general']['uc_checkout_skip_review'] = array(
        '#type' => 'checkbox',
        '#title' => t('Skip checkout review.'),
        '#default_value' => variable_get('uc_checkout_skip_review', FALSE),
      );
      break;
  }
}