refactor: 調整統計基準為明細筆數，並恢復庫存查詢為單一細目顯示模式

app/Modules/Inventory/Services/InventoryService.php

@@ -246,37 +246,8 @@ class InventoryService implements InventoryServiceInterface
                 $join->on('inventories.warehouse_id', '=', 'ss.warehouse_id')
                      ->on('inventories.product_id', '=', 'ss.product_id');
             })
-            ->whereNull('inventories.deleted_at');
-
-        // 決定是否啟用聚合顯示 (Group By Warehouse + Product)
-        // 當使用者在儀表板點選「狀態篩選」時，為了讓清單筆數與統計數字精確一致 (Dimension Alignment)，必須啟用 GROUP BY
-        $isGrouped = !empty($filters['status']) || ($filters['view_mode'] ?? '') === 'product';
-
-        if ($isGrouped) {
-            $query->select([
-                DB::raw('MIN(inventories.id) as id'), // 聚合後的代表 ID
-                'inventories.warehouse_id',
-                'inventories.product_id',
-                DB::raw('SUM(inventories.quantity) as quantity'),
-                DB::raw('GROUP_CONCAT(DISTINCT inventories.batch_number SEPARATOR ", ") as batch_number'),
-                DB::raw('MAX(inventories.expiry_date) as expiry_date'),
-                DB::raw('GROUP_CONCAT(DISTINCT inventories.location SEPARATOR ", ") as location'),
-                'products.code as product_code',
-                'products.name as product_name',
-                'categories.name as category_name',
-                'warehouses.name as warehouse_name',
-                'ss.safety_stock',
-            ])->groupBy(
-                'inventories.warehouse_id',
-                'inventories.product_id',
-                'products.code',
-                'products.name',
-                'categories.name',
-                'warehouses.name',
-                'ss.safety_stock'
-            );
-        } else {
-            $query->select([
+            ->whereNull('inventories.deleted_at')
+            ->select([
                 'inventories.id',
                 'inventories.warehouse_id',
                 'inventories.product_id',
@@ -291,7 +262,6 @@ class InventoryService implements InventoryServiceInterface
                 'warehouses.name as warehouse_name',
                 'ss.safety_stock',
             ]);
-        }
 
         // 篩選：倉庫
         if (!empty($filters['warehouse_id'])) {
@@ -381,56 +351,61 @@ class InventoryService implements InventoryServiceInterface
             $query->orderBy('products.code', 'asc');
         }
 
-        // 統計卡片（無篩選條件下的全域統計）
-        // 1. 庫存品項數：在庫的「倉庫-商品」對總數
+        // 統計卡片（預設無篩選條件下的全域統計，改為明細筆數計數以對齊顯示）
+        // 1. 庫存明細總數
         $totalItems = DB::table('inventories')
             ->whereNull('deleted_at')
-            ->distinct()
-            ->count(DB::raw('CONCAT(warehouse_id, "-", product_id)'));
-
-        // 2. 低庫存：以「倉庫-商品」聚合後的總量與安全庫存比較 (品項計數)
-        $lowStockCount = DB::table('warehouse_product_safety_stocks as ss')
-            ->join(DB::raw('(SELECT warehouse_id, product_id, SUM(quantity) as total_qty FROM inventories WHERE deleted_at IS NULL GROUP BY warehouse_id, product_id) as inv'),
-                function ($join) {
-                    $join->on('ss.warehouse_id', '=', 'inv.warehouse_id')
-                         ->on('ss.product_id', '=', 'inv.product_id');
-                })
-            ->whereRaw('inv.total_qty <= ss.safety_stock')
             ->count();
 
-        // 3. 負庫存：只要該「倉庫-商品」的總庫存為負數 (品項計數)
-        $negativeCount = DB::table(DB::raw('(SELECT warehouse_id, product_id, SUM(quantity) as total_qty FROM inventories WHERE deleted_at IS NULL GROUP BY warehouse_id, product_id) as inv'))
-            ->where('total_qty', '<', 0)
+        // 2. 低庫存明細數：只要該明細所屬的「倉庫+商品」總量低於安全庫存，則所有相關明細都計入
+        $lowStockCount = DB::table('inventories as i')
+            ->join('warehouse_product_safety_stocks as ss', function ($join) {
+                $join->on('i.warehouse_id', '=', 'ss.warehouse_id')
+                     ->on('i.product_id', '=', 'ss.product_id');
+            })
+            ->whereNull('i.deleted_at')
+            ->whereIn(DB::raw('(i.warehouse_id, i.product_id)'), function ($sub) {
+                $sub->select('i2.warehouse_id', 'i2.product_id')
+                    ->from('inventories as i2')
+                    ->whereNull('i2.deleted_at')
+                    ->groupBy('i2.warehouse_id', 'i2.product_id')
+                    ->havingRaw('SUM(i2.quantity) <= (SELECT safety_stock FROM warehouse_product_safety_stocks WHERE warehouse_id = i2.warehouse_id AND product_id = i2.product_id LIMIT 1)');
+            })
             ->count();
 
-        // 4. 即將過期：有任一批次效期符合的「品項」總數
+        // 3. 負庫存明細數
+        $negativeCount = DB::table('inventories as i')
+            ->whereNull('i.deleted_at')
+            ->whereIn(DB::raw('(i.warehouse_id, i.product_id)'), function ($sub) {
+                $sub->select('i2.warehouse_id', 'i2.product_id')
+                    ->from('inventories as i2')
+                    ->whereNull('i2.deleted_at')
+                    ->groupBy('i2.warehouse_id', 'i2.product_id')
+                    ->havingRaw('SUM(i2.quantity) < 0');
+            })
+            ->count();
+
+        // 4. 即將過期明細數
         $expiringCount = DB::table('inventories')
             ->whereNull('deleted_at')
             ->whereNotNull('expiry_date')
             ->where('expiry_date', '<=', $expiryThreshold)
-            ->distinct()
-            ->count(DB::raw('CONCAT(warehouse_id, "-", product_id)'));
+            ->count();
 
         // 分頁
         $paginated = $query->paginate($perPage)->withQueryString();
 
         // 為每筆紀錄附加最後入庫/出庫時間 + 狀態
-        $items = collect($paginated->items())->map(function ($item) use ($today, $expiryThreshold, $isGrouped) {
-            // 如果是聚合模式，Transaction 查詢也需要調整或略過單一批次查詢
-            $lastIn = null;
-            $lastOut = null;
+        $items = collect($paginated->items())->map(function ($item) use ($today, $expiryThreshold) {
+            $lastIn = \App\Modules\Inventory\Models\InventoryTransaction::where('inventory_id', $item->id)
+                ->where('type', '入庫')
+                ->orderByDesc('actual_time')
+                ->value('actual_time');
 
-            if (!$isGrouped) {
-                $lastIn = \App\Modules\Inventory\Models\InventoryTransaction::where('inventory_id', $item->id)
-                    ->where('type', '入庫')
-                    ->orderByDesc('actual_time')
-                    ->value('actual_time');
-
-                $lastOut = \App\Modules\Inventory\Models\InventoryTransaction::where('inventory_id', $item->id)
-                    ->where('type', '出庫')
-                    ->orderByDesc('actual_time')
-                    ->value('actual_time');
-            }
+            $lastOut = \App\Modules\Inventory\Models\InventoryTransaction::where('inventory_id', $item->id)
+                ->where('type', '出庫')
+                ->orderByDesc('actual_time')
+                ->value('actual_time');
 
             // 計算狀態
             $statuses = [];
@@ -466,7 +441,6 @@ class InventoryService implements InventoryServiceInterface
                 'last_inbound' => $lastIn ? \Carbon\Carbon::parse($lastIn)->toDateString() : null,
                 'last_outbound' => $lastOut ? \Carbon\Carbon::parse($lastOut)->toDateString() : null,
                 'statuses' => $statuses,
-                'is_grouped' => $isGrouped,
             ];
         });