<?php
declare(strict_types=1);

namespace MageSail\Magesail\Model;

use Magento\Framework\App\Request\Http;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Store\Api\StoreRepositoryInterface;

/**
 * Detects MageSail tunnel proxy (header / query / server / hostname vs persisted tunnel URLs) on the request.
 */
class TunnelRequestDetector
{
    private const HEADER_STORE_CODE = 'X-MageSail-Store-Code';
    private const QUERY_PARAM_STORE = 'magesail_store';
    private const SERVER_HEADER = 'HTTP_X_MAGESAIL_STORE_CODE';

    public function __construct(
        private readonly TunnelHostnameMatcher $tunnelHostnameMatcher,
        private readonly StoreRepositoryInterface $storeRepository
    ) {
    }

    public function getTunnelStoreCode(Http $request): ?string
    {
        $value = $request->getParam(self::QUERY_PARAM_STORE);
        if ($value !== null && trim((string) $value) !== '') {
            return $this->onlyIfStoreExists(trim((string) $value));
        }
        $value = $request->getHeader(self::HEADER_STORE_CODE);
        if ($value !== false && $value !== null && trim((string) $value) !== '') {
            return $this->onlyIfStoreExists(trim((string) $value));
        }
        $value = $request->getServer(self::SERVER_HEADER);
        if ($value !== null && $value !== '' && trim((string) $value) !== '') {
            return $this->onlyIfStoreExists(trim((string) $value));
        }
        $uri = (string) $request->getRequestUri();
        if ($uri !== '' && str_contains($uri, self::QUERY_PARAM_STORE . '=')) {
            $query = str_contains($uri, '?') ? substr($uri, strpos($uri, '?') + 1) : '';
            parse_str($query, $params);
            $v = $params[self::QUERY_PARAM_STORE] ?? '';
            if ($v !== '' && trim((string) $v) !== '') {
                return $this->onlyIfStoreExists(trim((string) $v));
            }
        }
        return $this->onlyIfStoreExists(
            $this->tunnelHostnameMatcher->getStoreCodeIfRequestHostMatchesState($request)
        );
    }

    private function onlyIfStoreExists(?string $code): ?string
    {
        if ($code === null || $code === '') {
            return null;
        }
        try {
            $this->storeRepository->get($code);
            return $code;
        } catch (NoSuchEntityException) {
            return null;
        }
    }
}