采购单优化

app/Exports/PurchaseOrderExport.php

@@ -8,7 +8,6 @@ use App\Models\PurchaseOrderModel;
 use App\Models\StoreModel;
 use App\Models\StoreOrderItemModel;
 use App\Models\SupplierModel;
-use App\Services\PurchaseEditService;
 use Illuminate\Support\Collection;
 use Maatwebsite\Excel\Concerns\FromCollection;
 use Maatwebsite\Excel\Concerns\WithHeadings;
@@ -75,7 +74,7 @@ class PurchaseOrderExport implements FromCollection, WithHeadings, WithMapping,
         foreach ($orderItems->groupBy('product_id') as $productId => $group) {
             $first = $group->first();
             $product = $products->get((int) $productId);
-            $unitCost = PurchaseEditService::unitCost((string) ($first->cost_price ?? '0'), (string) $first->product_spec);
+            $unitCost = $first->cost_price ?? '0';
 
             $quantity = '0';
             $weight = '0';
@@ -84,11 +83,8 @@ class PurchaseOrderExport implements FromCollection, WithHeadings, WithMapping,
             foreach ($group as $item) {
                 $quantity = bcadd($quantity, (string) $item->quantity, 2);
                 $weight = bcadd($weight, (string) $item->weight, 3);
-                $amount = bcadd($amount, PurchaseEditService::costAmount(
-                    (string) $item->quantity,
-                    (string) $item->weight,
-                    $unitCost
-                ), 2);
+                // 金额 = 数量 × 每包成本价（单价/包规不参与金额计算）
+                $amount = bcadd($amount, bcmul((string) $item->quantity, (string) $item->cost_price, 2), 2);
                 $storeQuantities[(int) $item->store_id] = bcadd(
                     $storeQuantities[(int) $item->store_id] ?? '0',
                     (string) $item->quantity,