From 9aed479e126bdd1855afb61249c9f8b39e2ca462 Mon Sep 17 00:00:00 2001
From: Tom Kirkpatrick <tom@systemseed.com>
Date: Sat, 14 Apr 2012 00:46:29 +0200
Subject: [PATCH] Ajax functionality for checkout page (mostly by jucallme)

---
 includes/commerce_coupon.checkout_pane.inc |   69 ++++++++++++++++++++++++++++
 1 files changed, 69 insertions(+), 0 deletions(-)

diff --git a/includes/commerce_coupon.checkout_pane.inc b/includes/commerce_coupon.checkout_pane.inc
index f77caa4..63645fc 100644
--- a/includes/commerce_coupon.checkout_pane.inc
+++ b/includes/commerce_coupon.checkout_pane.inc
@@ -18,15 +18,57 @@ function commerce_coupon_pane_checkout_form($form, &$form_state, $checkout_pane,
     '#description' => t('Enter here your coupon code.'),
   );
 
+  $pane_form['coupon_add'] = array(
+    '#type' => 'button',
+    '#value' => t('Add coupon'),
+    '#name' => 'coupon_add',
+    '#limit_validation_errors' => array(),
+    '#element_validate' => array(),
+    '#ajax' => array(
+      'callback' => 'commerce_coupon_add_coupon_callback',
+      'wrapper' => 'coupon-call-back',
+    ),
+  );
+
   // Extract the View and display keys from the cart contents pane setting.
   list($view_id, $display_id) = explode('|', variable_get('commerce_coupon_review_pane_view', 'commerce_coupon_review_pane|default'));
   if (!empty($view_id) && !empty($display_id)) {
     $pane_form['redeemed_coupons'] = array(
       '#type' => 'markup',
+      '#prefix' => '<div id="coupon-call-back">',
+      '#suffix' => '</div>',
       '#markup' => commerce_embed_view($view_id, $display_id, array($order->order_id)),
     );
   }
 
+  if ($form_state['triggering_element']['#name'] == 'coupon_add') {
+    if (!empty($form_state['values']['commerce_coupon']['coupon_add'])) {
+      list($view_id, $display_id) = explode('|', variable_get('commerce_coupon_review_pane_view', 'commerce_coupon_review_pane|default'));
+      if (!empty($view_id) && !empty($display_id)) {
+        $code =  $form_state['input']['commerce_coupon']['coupon_code'];
+        if (!empty($code) && commerce_coupon_code_is_valid($code, $order)) {
+          $coupon = commerce_coupon_load_by_code($code);
+          commerce_coupon_redeem_coupon($coupon, $order);
+
+          // clear the value, as we dont want errors when the user hits submit on fnal check out, as we would try add the value in the field again.
+          $form['commerce_coupon']['coupon_code']['#value'] = '';
+
+          if (isset($order->order_id) && is_numeric($order->order_id)) {
+            // this is to get the summary of the form rerendered.
+            $alter_coupon_commands = &drupal_static('alter_coupon_commands');
+            $coupon_current_order = &drupal_static('coupon_current_order');
+            $alter_coupon_commands = TRUE;
+            $coupon_current_order = $order->order_id;
+          }
+          $pane_form['redeemed_coupons']['#markup'] = commerce_embed_view($view_id, $display_id, array($order->order_id));
+        }
+        else {
+          $pane_form['redeemed_coupons']['#markup'] = t('Your coupon code is not valid.');
+        }
+      }
+    }
+  }
+
   return $pane_form;
 }
 
@@ -60,6 +102,33 @@ function commerce_coupon_pane_checkout_form_submit($form, &$form_state, $checkou
   if ($code = $form_state['values']['commerce_coupon']['coupon_code']) {
     $commerce_coupon = commerce_coupon_load_by_code($code);
     commerce_coupon_redeem_coupon($commerce_coupon, $order);
+    $form_state['rebuild'] = TRUE;
+  }
+}
+
+/**
+ * Callback for the ajax button coupon_add.
+ */
+function commerce_coupon_add_coupon_callback($form, &$form_state) {
+  return $form['commerce_coupon']['redeemed_coupons'];
+}
+
+/**
+ * Implements hook_ajax_render_alter().
+ *
+ * This is to get the summary of the cart to rerender on the add coupon button.
+ */
+function commerce_coupon_ajax_render_alter(&$commands) {
+  $alter_coupon_commands = &drupal_static('alter_coupon_commands');
+  $coupon_current_order = &drupal_static('coupon_current_order');
+
+  if ($alter_coupon_commands) {
+    $contents = array();
+    $contents['cart_contents_view'] = array(
+      '#markup' => commerce_embed_view('commerce_cart_summary', 'default', array($coupon_current_order)),
+    );
+    $contents = drupal_render($contents);
+    $commands[] = ajax_command_replace('.view-commerce-cart-summary', $contents);
   }
 }
 
-- 
1.7.4.4