<?php

declare(strict_types=1);

namespace MeshVault\Console;

use Closure;

/**
 * Defers engine construction until a command actually needs it, so usage
 * errors and help never require a configured database or library.
 */
final class LazyConsoleServices implements ConsoleServices
{
    private readonly Closure $factory;

    private ?ConsoleServices $delegate = null;

    /** @param callable(): ConsoleServices $factory */
    public function __construct(callable $factory)
    {
        $this->factory = Closure::fromCallable($factory);
    }

    public function import(string $sourcePath, array $extensions): int
    {
        return $this->delegate()->import($sourcePath, $extensions);
    }

    public function runWorkerOnce(callable $shouldStop): ?int
    {
        return $this->delegate()->runWorkerOnce($shouldStop);
    }

    private function delegate(): ConsoleServices
    {
        return $this->delegate ??= ($this->factory)();
    }
}