<?php

namespace App\Twig;

use App\Ops\Updater;
use Twig\Extension\AbstractExtension;
use Twig\TwigFunction;

/**
 * The running version, for the administration shell.
 *
 * A function rather than a global, so the templates get exactly this one read-only answer and not
 * a whole updater with an update() method on it.
 */
final class VersionExtension extends AbstractExtension
{
    public function __construct(private Updater $updater, private \Doctrine\DBAL\Connection $db)
    {
    }

    public function getFunctions(): array
    {
        return [new TwigFunction('kant_version', $this->updater->version(...)), new TwigFunction('kant_update_version', $this->available(...))];
    }

    public function available(): ?string
    {
        // The daily worker already checks releases. Rendering navigation never contacts Git.
        try {
            $message = $this->db->fetchOne('SELECT last_message FROM scheduled_task WHERE name = ?', ['update-check']);
            if (is_string($message) && 1 === preg_match('/^Fassung (\d+\.\d+\.\d+) ist verfügbar/', $message, $match)
                && version_compare($match[1], $this->updater->version(), '>')) {
                return $match[1];
            }
        } catch (\Doctrine\DBAL\Exception) {
            // An installation still waiting for migrations has no task table yet.
        }

        return null;
    }
}