star-erp/app/Http/Controllers/DashboardController.php

<?php

namespace App\Http\Controllers;

use App\Models\Product;
use App\Models\Vendor;
use App\Models\PurchaseOrder;
use App\Models\Warehouse;
use App\Models\Inventory;
use App\Models\WarehouseProductSafetyStock;
use Inertia\Inertia;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class DashboardController extends Controller
{
    public function index()
    {
        $centralDomains = config('tenancy.central_domains', []);

        $demoPort = config('tenancy.demo_tenant_port');
        if ((!$demoPort || request()->getPort() != $demoPort) && in_array(request()->getHost(), $centralDomains)) {
            return redirect()->route('landlord.dashboard');
        }

        // 計算低庫存數量：各商品在各倉庫的總量 < 安全庫存
        $lowStockCount = DB::table('warehouse_product_safety_stocks as ss')
            ->join(DB::raw('(SELECT warehouse_id, product_id, SUM(quantity) as total_qty FROM inventories WHERE deleted_at IS NULL GROUP BY warehouse_id, product_id) as inv'),
                function ($join) {
                    $join->on('ss.warehouse_id', '=', 'inv.warehouse_id')
                         ->on('ss.product_id', '=', 'inv.product_id');
                })
            ->whereRaw('inv.total_qty <= ss.safety_stock')
            ->count();

        $stats = [
            'productsCount' => Product::count(),
            'vendorsCount' => Vendor::count(),
            'purchaseOrdersCount' => PurchaseOrder::count(),
            'warehousesCount' => Warehouse::count(),
            'totalInventoryValue' => Inventory::join('products', 'inventories.product_id', '=', 'products.id')
                ->sum('inventories.quantity'),
            'pendingOrdersCount' => PurchaseOrder::where('status', 'pending')->count(),
            'lowStockCount' => $lowStockCount,
        ];

        return Inertia::render('Dashboard', [
            'stats' => $stats,
        ]);
    }
}