<?php

namespace Stemcell\Checkout\Observer;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Psr\Log\LoggerInterface;

class ApplyCustomerDiscount implements ObserverInterface
{
    private RequestInterface $request;

    public function __construct(
        RequestInterface $request
    ) {
        $this->request = $request;
    }

    /**
     * @param \Magento\Quote\Model\Quote\Item $item
     * @return $this
     */
    protected function getDiscountPercent(\Magento\Quote\Model\Quote\Item $item)
    {
        $cartData = $this->request->getParam('cart');
        if (isset($cartData[$item->getId()]['customer_discount_percent'])) {
            $discount = floatval($cartData[$item->getId()]['customer_discount_percent']);
            $item->setCustomerDiscountPercent($discount);
        }

        return $this;
    }
    public function execute(Observer $observer)
    {
        /* @var $cart \Magento\Checkout\Model\Cart */
        $cart = $observer->getCart();
        $logger = ObjectManager::getInstance()->get(LoggerInterface::class);
        foreach ($cart->getItems() as $item) {
            /* @var $item \Magento\Quote\Model\Quote\Item */
            $this->getDiscountPercent($item);
        }
    }
}