Feature: Order Updates, Events, Order Flows, Shipment And COD support

src/Shipping/Support/WeightCalculator.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Modules\Core\Shipping\Support;
+
+use Illuminate\Support\Collection;
+
+/**
+ * Sums ProductVariant::weight_value/weight_unit across a collection of
+ * Cart/Order lines into a single kg figure — the same conversion table
+ * Modules\Core\Shipping\Carriers\Acs\AcsRateDriver::totalWeightInKg()
+ * already used privately for live rate quoting, now shared so
+ * Modules\Core\Shipping\Extensions\OrderViewExtension's "Create Shipment"
+ * weight default can compute the identical figure for an already-placed
+ * Order instead of duplicating the unit table.
+ */
+class WeightCalculator
+{
+    /**
+     * @param  Collection  $lines  Cart::$lines or Order::$lines, each with
+     *   its purchasable relation loaded (or loadable — ->load('purchasable')
+     *   is called here if not already eager-loaded).
+     */
+    public static function totalKg(Collection $lines): float
+    {
+        $weight = 0.0;
+
+        foreach ($lines->load('purchasable') as $line) {
+            $variant = $line->purchasable;
+
+            if (! $variant || ! $variant->weight_value) {
+                continue;
+            }
+
+            $unit = $variant->weight_unit ?? 'kg';
+            $value = (float) $variant->weight_value;
+
+            $weight += match ($unit) {
+                'g' => $value / 1000,
+                'lb' => $value * 0.45359237,
+                'oz' => $value * 0.0283495231,
+                default => $value, // kg
+            } * $line->quantity;
+        }
+
+        return $weight;
+    }
+}