<?php
declare(strict_types=1);

namespace MageSail\Magesail\Model;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Serialize\Serializer\Json;

/**
 * Persists tunnel store metadata in var/ for teardown and admin display.
 */
class TunnelStoreState
{
    private const FILENAME = 'magesail_tunnel_store.json';

    public function __construct(
        private readonly DirectoryList $directoryList,
        private readonly Json $json
    ) {
    }

    public function getFilePath(): string
    {
        return $this->directoryList->getPath(DirectoryList::VAR_DIR) . '/' . self::FILENAME;
    }

    /**
     * @return array{store_id: int, store_code: string, unsecure_base_url: string, secure_base_url: string, use_secure_urls: bool, nginx_pending_reload?: bool}|null
     */
    public function read(): ?array
    {
        $path = $this->getFilePath();
        if (!\is_readable($path)) {
            return null;
        }
        $raw = file_get_contents($path);
        if ($raw === false || trim($raw) === '') {
            return null;
        }
        try {
            /** @var array $data */
            $data = $this->json->unserialize($raw);
        } catch (\InvalidArgumentException) {
            return null;
        }
        if (!isset($data['store_id'], $data['store_code'])) {
            return null;
        }
        return [
            'store_id' => (int) $data['store_id'],
            'store_code' => (string) $data['store_code'],
            'unsecure_base_url' => (string) ($data['unsecure_base_url'] ?? ''),
            'secure_base_url' => (string) ($data['secure_base_url'] ?? ''),
            'use_secure_urls' => (bool) ($data['use_secure_urls'] ?? false),
            'nginx_pending_reload' => (bool) ($data['nginx_pending_reload'] ?? false),
        ];
    }

    /**
     * @param array{store_id: int, store_code: string, unsecure_base_url: string, secure_base_url: string, use_secure_urls: bool, nginx_pending_reload?: bool} $data
     */
    public function write(array $data): void
    {
        $path = $this->getFilePath();
        $payload = $this->json->serialize($data);
        if (file_put_contents($path, $payload, LOCK_EX) === false) {
            throw new \RuntimeException('Could not write tunnel store state file.');
        }
    }

    public function delete(): void
    {
        $path = $this->getFilePath();
        if (\is_file($path)) {
            @unlink($path);
        }
    }
}