From 75133c366a5a8e42b5934490278139de8eacff81 Mon Sep 17 00:00:00 2001
From: dwindown <dwinx.ramz@gmail.com>
Date: Mon, 10 Nov 2025 16:06:15 +0700
Subject: [PATCH] fix(orders): Initialize WooCommerce cart/session before use
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## Issue:
500 error on shipping/calculate and orders/preview endpoints
Error: "Call to a member function empty_cart() on null"

## Root Cause:
WC()->cart is not initialized in admin/REST API context
Calling WC()->cart->empty_cart() fails when cart is null

## Solution:
Initialize WooCommerce cart and session before using:

```php
// Initialize if not already loaded
if ( ! WC()->cart ) {
    wc_load_cart();
}
if ( ! WC()->session ) {
    WC()->session = new \WC_Session_Handler();
    WC()->session->init();
}

// Now safe to use
WC()->cart->empty_cart();
```

## Changes:
- Added initialization in calculate_shipping()
- Added initialization in preview_order()
- Both methods now safely use WC()->cart

## Testing:
- ✅ Endpoints no longer return 500 error
- ✅ Cart operations work correctly
- ✅ Session handling works in admin context
---
 includes/Api/OrdersController.php | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/includes/Api/OrdersController.php b/includes/Api/OrdersController.php
index 24eb07b..39e7b90 100644
--- a/includes/Api/OrdersController.php
+++ b/includes/Api/OrdersController.php
@@ -1236,6 +1236,15 @@ class OrdersController {
     }
 
     try {
+      // Initialize WooCommerce cart and session if not already
+      if ( ! WC()->cart ) {
+        wc_load_cart();
+      }
+      if ( ! WC()->session ) {
+        WC()->session = new \WC_Session_Handler();
+        WC()->session->init();
+      }
+      
       // Create a temporary cart to calculate shipping
       WC()->cart->empty_cart();
       
@@ -1319,6 +1328,15 @@ class OrdersController {
     }
 
     try {
+      // Initialize WooCommerce cart and session if not already
+      if ( ! WC()->cart ) {
+        wc_load_cart();
+      }
+      if ( ! WC()->session ) {
+        WC()->session = new \WC_Session_Handler();
+        WC()->session->init();
+      }
+      
       // Use WooCommerce cart for calculation
       WC()->cart->empty_cart();