修复BUG

app/Services/PurchaseItemService.php

@@ -4,6 +4,7 @@ namespace App\Services;
 
 use App\Models\ProductModel;
 use App\Models\PurchaseOrderModel;
+use App\Models\StoreModel;
 use App\Models\StoreOrderItemModel;
 use App\Models\StoreOrderModel;
 use Illuminate\Database\Eloquent\Collection;
@@ -138,6 +139,60 @@ class PurchaseItemService
         return $this->sortRows($rows);
     }
 
+    /**
+     * 供应商采购明细矩阵（导出用）：该供应商在采购单内的商品行按市场分组，
+     * 行附「汇总数量 + 各门店数量」；门店列=本采购单内有该供应商明细的门店（按ID排序）
+     *
+     * @return array{
+     *     stores: array<int, string>,
+     *     markets: array<string, array<int, array<string, mixed>>>
+     * }
+     */
+    public function supplierMarketMatrix(int $purchaseId, int $supplierId): array
+    {
+        $items = $this->purchaseItems($purchaseId)
+            ->where('supplier_id', $supplierId)
+            ->sortBy('id');
+
+        $storeIds = $items->pluck('store_id')
+            ->map(static fn ($id): int => (int) $id)
+            ->unique()->sort()->values()->all();
+        $stores = StoreModel::withTrashed()
+            ->whereIn('id', $storeIds)
+            ->orderBy('id')
+            ->pluck('name', 'id')
+            ->toArray();
+
+        $rows = [];
+        foreach ($items->groupBy('product_id') as $productId => $group) {
+            $first = $group->first();
+            $quantity = 0;
+            $storeQuantities = array_fill_keys(array_map('intval', array_keys($stores)), 0);
+            foreach ($group as $item) {
+                $quantity += (int) $item->quantity;
+                $storeQuantities[(int) $item->store_id] += (int) $item->quantity;
+            }
+
+            $rows[] = [
+                'product_id' => (int) $productId,
+                'product_name' => $first->product_name,
+                'market' => (string) data_get($first, 'market', ''),
+                'quantity' => $quantity,
+                'store_quantities' => $storeQuantities,
+                'category_sort' => (int) data_get($first, 'category_sort', 9999),
+                'product_sort' => (int) data_get($first, 'product_sort', 9999),
+            ];
+        }
+
+        // 排序后按市场分组（组间/组内均保持 分类sort → 商品sort 顺序）
+        $markets = [];
+        foreach ($this->sortRows($rows) as $row) {
+            $markets[$row['market']][] = $row;
+        }
+
+        return ['stores' => $stores, 'markets' => $markets];
+    }
+
     /**
      * 采购单订货明细（关联订单过滤软删、成本价可见、附分类/商品排序键）
      *