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app/Http/Controllers/InventoryController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+
+class InventoryController extends Controller
+{
+    public function index(\Illuminate\Http\Request $request, \App\Models\Warehouse $warehouse)
+    {
+        $warehouse->load([
+            'inventories.product.category',
+            'inventories.lastIncomingTransaction',
+            'inventories.lastOutgoingTransaction'
+        ]);
+        $allProducts = \App\Models\Product::with('category')->get();
+
+        // 1. 準備 availableProducts
+        $availableProducts = $allProducts->map(function ($product) {
+            return [
+                'id' => (string) $product->id, // Frontend expects string
+                'name' => $product->name,
+                'type' => $product->category ? $product->category->name : '其他', // 暫時用 Category Name 當 Type
+            ];
+        });
+
+        // 2. 準備 inventories (模擬批號)
+        // 2. 準備 inventories
+        // 資料庫結構為 (warehouse_id, product_id) 唯一，故為扁平列表
+        $inventories = $warehouse->inventories->map(function ($inv) {
+            return [
+                'id' => (string) $inv->id,
+                'warehouseId' => (string) $inv->warehouse_id,
+                'productId' => (string) $inv->product_id,
+                'productName' => $inv->product->name,
+                'productCode' => $inv->product->code ?? 'N/A',
+                'unit' => $inv->product->base_unit ?? '個',
+                'quantity' => (float) $inv->quantity,
+                'safetyStock' => $inv->safety_stock !== null ? (float) $inv->safety_stock : null,
+                'status' => '正常', // 前端會根據 quantity 與 safetyStock 重算，但後端亦可提供基礎狀態
+                'batchNumber' => 'BATCH-' . $inv->id, // DB 無批號，暫時模擬，某些 UI 可能還會用到
+                'expiryDate' => '2099-12-31', // DB 無效期，暫時模擬
+                'lastInboundDate' => $inv->lastIncomingTransaction ? ($inv->lastIncomingTransaction->actual_time ? $inv->lastIncomingTransaction->actual_time->format('Y-m-d') : $inv->lastIncomingTransaction->created_at->format('Y-m-d')) : null,
+                'lastOutboundDate' => $inv->lastOutgoingTransaction ? ($inv->lastOutgoingTransaction->actual_time ? $inv->lastOutgoingTransaction->actual_time->format('Y-m-d') : $inv->lastOutgoingTransaction->created_at->format('Y-m-d')) : null,
+            ];
+        });
+
+        // 3. 準備 safetyStockSettings
+        $safetyStockSettings = $warehouse->inventories->filter(function($inv) {
+            return !is_null($inv->safety_stock);
+        })->map(function ($inv) {
+            return [
+                'id' => 'ss-' . $inv->id,
+                'warehouseId' => (string) $inv->warehouse_id,
+                'productId' => (string) $inv->product_id,
+                'productName' => $inv->product->name,
+                'productType' => $inv->product->category ? $inv->product->category->name : '其他',
+                'safetyStock' => (float) $inv->safety_stock,
+                'createdAt' => $inv->created_at->toIso8601String(),
+                'updatedAt' => $inv->updated_at->toIso8601String(),
+            ];
+        })->values();
+
+        return \Inertia\Inertia::render('Warehouse/Inventory', [
+            'warehouse' => $warehouse,
+            'inventories' => $inventories,
+            'safetyStockSettings' => $safetyStockSettings,
+            'availableProducts' => $availableProducts,
+        ]);
+    }
+
+    public function create(\App\Models\Warehouse $warehouse)
+    {
+        // 取得所有商品供前端選單使用
+        $products = \App\Models\Product::select('id', 'name', 'base_unit')->get()->map(function ($product) {
+            return [
+                'id' => (string) $product->id,
+                'name' => $product->name,
+                'unit' => $product->base_unit,
+            ];
+        });
+
+        return \Inertia\Inertia::render('Warehouse/AddInventory', [
+            'warehouse' => $warehouse,
+            'products' => $products,
+        ]);
+    }
+
+    public function store(\Illuminate\Http\Request $request, \App\Models\Warehouse $warehouse)
+    {
+        $validated = $request->validate([
+            'inboundDate' => 'required|date',
+            'reason' => 'required|string',
+            'notes' => 'nullable|string',
+            'items' => 'required|array|min:1',
+            'items.*.productId' => 'required|exists:products,id',
+            'items.*.quantity' => 'required|numeric|min:0.01',
+        ]);
+
+        return \Illuminate\Support\Facades\DB::transaction(function () use ($validated, $warehouse) {
+            foreach ($validated['items'] as $item) {
+                // 取得或建立庫存紀錄
+                $inventory = $warehouse->inventories()->firstOrCreate(
+                    ['product_id' => $item['productId']],
+                    ['quantity' => 0, 'safety_stock' => null]
+                );
+
+                $currentQty = $inventory->quantity;
+                $newQty = $currentQty + $item['quantity'];
+
+                // 更新庫存
+                $inventory->update(['quantity' => $newQty]);
+
+                // 寫入異動紀錄
+                $inventory->transactions()->create([
+                    'type' => '手動入庫',
+                    'quantity' => $item['quantity'],
+                    'balance_before' => $currentQty,
+                    'balance_after' => $newQty,
+                    'reason' => $validated['reason'] . ($validated['notes'] ? ' - ' . $validated['notes'] : ''),
+                    'actual_time' => $validated['inboundDate'],
+                    'user_id' => auth()->id(),
+                ]);
+            }
+
+            return redirect()->route('warehouses.inventory.index', $warehouse->id)
+                ->with('success', '庫存記錄已儲存成功');
+        });
+    }
+
+    public function edit(\App\Models\Warehouse $warehouse, $inventoryId)
+    {
+        // 取得庫存紀錄，包含商品資訊與異動紀錄 (含經手人)
+        // 這裡如果是 Mock 的 ID (mock-inv-1)，需要特殊處理
+        if (str_starts_with($inventoryId, 'mock-inv-')) {
+             return redirect()->back()->with('error', '無法編輯範例資料');
+        }
+
+        $inventory = \App\Models\Inventory::with(['product', 'transactions' => function($query) {
+            $query->orderBy('actual_time', 'desc')->orderBy('id', 'desc');
+        }, 'transactions.user'])->findOrFail($inventoryId);
+
+        // 轉換為前端需要的格式
+        $inventoryData = [
+            'id' => (string) $inventory->id,
+            'warehouseId' => (string) $inventory->warehouse_id,
+            'productId' => (string) $inventory->product_id,
+            'productName' => $inventory->product->name,
+            'quantity' => (float) $inventory->quantity,
+            'batchNumber' => 'BATCH-' . $inventory->id, // Mock
+            'expiryDate' => '2099-12-31', // Mock
+            'lastInboundDate' => $inventory->updated_at->format('Y-m-d'),
+            'lastOutboundDate' => null,
+        ];
+
+        // 整理異動紀錄
+        $transactions = $inventory->transactions->map(function ($tx) {
+            return [
+                'id' => (string) $tx->id,
+                'type' => $tx->type,
+                'quantity' => (float) $tx->quantity,
+                'balanceAfter' => (float) $tx->balance_after,
+                'reason' => $tx->reason,
+                'userName' => $tx->user ? $tx->user->name : '系統',
+                'actualTime' => $tx->actual_time ? $tx->actual_time->format('Y-m-d H:i') : $tx->created_at->format('Y-m-d H:i'),
+            ];
+        });
+
+        return \Inertia\Inertia::render('Warehouse/EditInventory', [
+            'warehouse' => $warehouse,
+            'inventory' => $inventoryData,
+            'transactions' => $transactions,
+        ]);
+    }
+
+    public function update(\Illuminate\Http\Request $request, \App\Models\Warehouse $warehouse, $inventoryId)
+    {
+        // 若是 product ID (舊邏輯)，先轉為 inventory
+        // 但新路由我們傳的是 inventory ID
+        // 為了相容，我們先判斷 $inventoryId 是 inventory ID
+        
+        $inventory = \App\Models\Inventory::find($inventoryId);
+        
+        // 如果找不到 (可能是舊路由傳 product ID)
+        if (!$inventory) {
+             $inventory = $warehouse->inventories()->where('product_id', $inventoryId)->first();
+        }
+
+        if (!$inventory) {
+            return redirect()->back()->with('error', '找不到庫存紀錄');
+        }
+
+        $validated = $request->validate([
+            'quantity' => 'required|numeric|min:0',
+            // 以下欄位改為 nullable，支援新表單
+            'type' => 'nullable|string',
+            'operation' => 'nullable|in:add,subtract,set',
+            'reason' => 'nullable|string',
+            'notes' => 'nullable|string',
+            // 新增日期欄位驗證 (雖然暫不儲存到 DB)
+            'batchNumber' => 'nullable|string',
+            'expiryDate' => 'nullable|date',
+            'lastInboundDate' => 'nullable|date',
+            'lastOutboundDate' => 'nullable|date',
+        ]);
+
+        return \Illuminate\Support\Facades\DB::transaction(function () use ($validated, $inventory) {
+            $currentQty = $inventory->quantity;
+            $newQty = $validated['quantity'];
+            
+            // 判斷操作模式
+            if (isset($validated['operation'])) {
+                $changeQty = 0;
+                switch ($validated['operation']) {
+                    case 'add':
+                        $changeQty = $validated['quantity'];
+                        $newQty = $currentQty + $changeQty;
+                        break;
+                    case 'subtract':
+                        $changeQty = -$validated['quantity'];
+                        $newQty = $currentQty + $changeQty;
+                        break;
+                    case 'set':
+                        $changeQty = $newQty - $currentQty;
+                        break;
+                }
+            } else {
+                // 來自編輯頁面，直接 Set
+                $changeQty = $newQty - $currentQty;
+            }
+
+            // 更新庫存
+            $inventory->update(['quantity' => $newQty]);
+
+            // 異動類型映射
+            $type = $validated['type'] ?? 'adjustment';
+            $typeMapping = [
+                'adjustment' => '盤點調整',
+                'purchase_in' => '採購進貨',
+                'sales_out' => '銷售出庫',
+                'return_in' => '退貨入庫',
+                'return_out' => '退貨出庫',
+                'transfer_in' => '撥補入庫',
+                'transfer_out' => '撥補出庫',
+            ];
+            $chineseType = $typeMapping[$type] ?? $type;
+            
+            // 如果是編輯頁面來的，可能沒有 type，預設為 "盤點調整" 或 "手動編輯"
+            if (!isset($validated['type'])) {
+                $chineseType = '手動編輯';
+            }
+
+            // 寫入異動紀錄
+            // 如果數量沒變，是否要寫紀錄？通常編輯頁面按儲存可能只改了其他欄位(如果有)
+            // 但因為我們目前只存 quantity，如果 quantity 沒變，可以不寫異動，或者寫一筆 0 的異動代表更新屬性
+            if (abs($changeQty) > 0.0001) {
+                $inventory->transactions()->create([
+                    'type' => $chineseType,
+                    'quantity' => $changeQty,
+                    'balance_before' => $currentQty,
+                    'balance_after' => $newQty,
+                    'reason' => ($validated['reason'] ?? '編輯頁面更新') . ($validated['notes'] ?? ''),
+                    'actual_time' => now(), // 手動調整設定為當下
+                    'user_id' => auth()->id(),
+                ]);
+            }
+
+            return redirect()->route('warehouses.inventory.index', $inventory->warehouse_id)
+                ->with('success', '庫存資料已更新');
+        });
+    }
+
+    public function destroy(\App\Models\Warehouse $warehouse, $inventoryId)
+    {
+         $inventory = \App\Models\Inventory::findOrFail($inventoryId);
+         
+         // 歸零異動
+         if ($inventory->quantity > 0) {
+             $inventory->transactions()->create([
+                    'type' => '手動編輯',
+                    'quantity' => -$inventory->quantity,
+                    'balance_before' => $inventory->quantity,
+                    'balance_after' => 0,
+                    'reason' => '刪除庫存品項',
+                    'actual_time' => now(),
+                    'user_id' => auth()->id(),
+             ]);
+         }
+         
+         $inventory->delete();
+         
+         return redirect()->route('warehouses.inventory.index', $warehouse->id)
+                ->with('success', '庫存品項已刪除');
+    }
+
+    public function history(\App\Models\Warehouse $warehouse, $inventoryId)
+    {
+        $inventory = \App\Models\Inventory::with(['product', 'transactions' => function($query) {
+            $query->orderBy('actual_time', 'desc')->orderBy('id', 'desc');
+        }, 'transactions.user'])->findOrFail($inventoryId);
+
+        $transactions = $inventory->transactions->map(function ($tx) {
+            return [
+                'id' => (string) $tx->id,
+                'type' => $tx->type,
+                'quantity' => (float) $tx->quantity,
+                'balanceAfter' => (float) $tx->balance_after,
+                'reason' => $tx->reason,
+                'userName' => $tx->user ? $tx->user->name : '系統',
+                'actualTime' => $tx->actual_time ? $tx->actual_time->format('Y-m-d H:i') : $tx->created_at->format('Y-m-d H:i'),
+            ];
+        });
+
+        return \Inertia\Inertia::render('Warehouse/InventoryHistory', [
+            'warehouse' => $warehouse,
+            'inventory' => [
+                'id' => (string) $inventory->id,
+                'productName' => $inventory->product->name,
+                'productCode' => $inventory->product->code,
+                'quantity' => (float) $inventory->quantity,
+            ],
+            'transactions' => $transactions
+        ]);
+    }
+}