pai-sklep/app/Http/Controllers/CartController.php

<?php

namespace App\Http\Controllers;

use App\Models\Product;
use App\Models\User;
use Exception;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Log;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;

class CartController extends Controller
{
    /**
     * Display the specified resource.
     *
     * @param  \App\Models\Product  $product
     * @return \Illuminate\Http\Response
     */
    public function show()
    {
        $user = Auth::user();
        if (!$user) {
            throw new AccessDeniedHttpException("Not logged in");
        }
        return view("cart", ["user" => $user]);
    }

    public function addToCart(Product $product, Request $request)
    {
        $user = Auth::user();
        $user->cart()->syncWithoutDetaching([$product->uuid]);
        $quantity = $request->validate([
            'quantity' => 'numeric|min:1'
        ])["quantity"];

        if($quantity) {
            $pivot = $user->cart()->findOrFail($product->uuid)->pivot;
            $pivot->quantity = $quantity;
            $pivot->save();
        }

        return back();
    }

    public function removeFromCart(Product $product)
    {
        $user = Auth::user();
        $user->cart()->detach($product);
        return back();
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \App\Models\Product  $product
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, Product $product)
    {
        $product->fill($request->all());
        $product->save();
        return redirect()->route("product.show", [ 'product' => $product])->with("message", "Product created successfully");
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  \App\Models\Product  $product
     * @return \Illuminate\Http\Response
     */
    public function destroy(Product $product)
    {
        $product->delete();
        return redirect()->route("product.index");
    }
}