<?php
declare(strict_types=1);

namespace MageSail\Magesail\Model;

use Magento\Framework\App\Request\Http;

/**
 * Hostname-only tunnel detection against persisted tunnel base URLs (nginx global map without MageSail headers).
 */
class TunnelHostnameMatcher
{
    public function __construct(
        private readonly TunnelStoreState $tunnelStoreState
    ) {
    }

    /**
     * When HTTP_HOST matches unsecure or secure tunnel base URL host, return the persisted store code.
     */
    public function getStoreCodeIfRequestHostMatchesState(Http $request): ?string
    {
        $state = $this->tunnelStoreState->read();
        if ($state === null) {
            return null;
        }
        $requestHost = self::hostFromHttpHost($request->getServer('HTTP_HOST'));
        if ($requestHost === null) {
            return null;
        }
        foreach ([$state['unsecure_base_url'], $state['secure_base_url']] as $baseUrl) {
            if ($baseUrl === '') {
                continue;
            }
            $configuredHost = self::hostFromBaseUrl($baseUrl);
            if ($configuredHost !== null && strcasecmp($requestHost, $configuredHost) === 0) {
                return $state['store_code'];
            }
        }
        return null;
    }

    public static function hostFromHttpHost(?string $httpHost): ?string
    {
        if ($httpHost === null || $httpHost === '') {
            return null;
        }
        $parsed = parse_url('http://' . $httpHost);
        if ($parsed === false || !isset($parsed['host'])) {
            return null;
        }
        return $parsed['host'];
    }

    public static function hostFromBaseUrl(string $baseUrl): ?string
    {
        $parsed = parse_url($baseUrl);
        if ($parsed === false || !isset($parsed['host'])) {
            return null;
        }
        return $parsed['host'];
    }
}