<?php
declare(strict_types=1);

namespace MageSail\Magesail\Plugin\Backend\App\Area;

use Magento\Backend\App\Area\FrontNameResolver;
use Magento\Framework\App\Request\Http;
use Magento\Framework\App\RequestInterface;
use MageSail\Magesail\Model\TunnelRequestDetector;

/**
 * When the tunnel is used, HTTP_HOST is often dev.myshop.local while default backend base URLs point at production.
 * {@see FrontNameResolver::getFrontName(true)} then returns false, so {@see \Magento\Framework\App\AreaList}
 * never maps the admin front name to adminhtml and /admin_* is dispatched as frontend (404).
 *
 * Bypass host validation when: (1) tunnel proxy headers/query are present, or (2) the request host matches the
 * tunnel store base URLs from provisioned state (browser opened admin URL directly without X-MageSail-Store-Code).
 *
 * @see TunnelRequestDetector::getTunnelStoreCode() for detection (includes hostname match via persisted state).
 */
class TunnelBackendFrontNameResolverPlugin
{
    public function __construct(
        private readonly RequestInterface $request,
        private readonly TunnelRequestDetector $tunnelRequestDetector
    ) {
    }

    /**
     * @param FrontNameResolver $subject
     * @param callable(bool $checkHost=): string|false $proceed
     * @return string|false
     */
    public function aroundGetFrontName(FrontNameResolver $subject, callable $proceed, $checkHost = false)
    {
        $result = $proceed($checkHost);
        if ($result !== false) {
            return $result;
        }
        if (!$checkHost || !$this->request instanceof Http) {
            return $result;
        }
        if ($this->tunnelRequestDetector->getTunnelStoreCode($this->request) === null) {
            return $result;
        }
        if ($subject->isHostBackend()) {
            return $result;
        }
        return $proceed(false);
    }
}