<?php
declare(strict_types=1);

namespace Esun\Cart\Plugin\Shipping;

use Esun\Cart\Model\ShippingEstimate;
use Magento\OfflineShipping\Model\Carrier\Flatrate;
use Magento\Quote\Model\Quote\Address\RateRequest;
use Magento\Shipping\Model\Rate\Result;

class FlatratePlugin
{
    public function __construct(
        private readonly ShippingEstimate $shippingEstimate
    ) {
    }

    public function afterCollectRates(
        Flatrate $subject,
        Result|bool $result,
        RateRequest $request
    ): Result|bool {
        if (!$result instanceof Result) {
            return $result;
        }

        $isFreeShipping = (bool)$request->getFreeShipping()
            || $this->shippingEstimate->isFreeShippingForItems((array)$request->getAllItems());
        if (!$isFreeShipping) {
            return $result;
        }

        foreach ($result->getAllRates() as $rate) {
            $rate->setPrice(0.0);
            $rate->setCost(0.0);
        }

        return $result;
    }
}