warehouse/app/Http/Controllers/Items/ReceiveStockController.php

<?php

namespace App\Http\Controllers\Items;

use App\Models\Item;
use App\Models\Location;
use App\Models\Stock;
use App\Models\StockMovement;
use Framework\Routing\Router;

class ReceiveStockController
{
    public function handle(Router $router)
    {
        if (!session()->has('user_id')) {
            return redirect($router->route('show-register-form'));
        }

        secure();

        $parameters = $router->current()->parameters();

        $item = Item::find((int) $parameters['item']);

        if (!$item) {
            return redirect($router->route('show-items'));
        }

        $data = validate($_POST, [
            'location_id' => ['required'],
            'quantity' => ['required', 'positive_integer'],
            'notes' => [],
        ], 'receive_errors');

        $location = Location::find((int) $data['location_id']);

        if (!$location) {
            return redirect($router->route('show-receive-stock-form', ['item' => $item->id]));
        }

        $stock = Stock::forItemAtLocation($item->id, $location->id);
        $stock->quantity = $stock->quantity + (int) $data['quantity'];
        $stock->save();

        $movement = new StockMovement();
        $movement->item_id = $item->id;
        $movement->location_id = $location->id;
        $movement->type = 'receive';
        $movement->quantity_change = (int) $data['quantity'];
        $movement->quantity_after = $stock->quantity;
        $movement->notes = $data['notes'] ?? '';
        $movement->user_id = session('user_id');
        $movement->save();

        return redirect($router->route('view-item', ['item' => $item->id]));
    }
}