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<?php

/*
 * This file is part of the Fidry CPUCounter Config package.
 *
 * (c) Théo FIDRY <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace Fidry\CpuCoreCounter\Finder;

use function getenv;
use function sprintf;

final class OnlyInPowerShellFinder implements CpuCoreFinder
{
    /**
     * @var CpuCoreFinder
     */
    private $decoratedFinder;

    public function __construct(CpuCoreFinder $decoratedFinder)
    {
        $this->decoratedFinder = $decoratedFinder;
    }

    public function diagnose(): string
    {
        $powerShellModulePath = getenv('PSModulePath');

        return $this->skip()
            ? sprintf(
                'Skipped; no power shell module path detected ("%s").',
                $powerShellModulePath
            )
            : $this->decoratedFinder->diagnose();
    }

    public function find(): ?int
    {
        return $this->skip()
            ? null
            : $this->decoratedFinder->find();
    }

    public function toString(): string
    {
        return sprintf(
            'OnlyInPowerShellFinder(%s)',
            $this->decoratedFinder->toString()
        );
    }

    private function skip(): bool
    {
        return false === getenv('PSModulePath');
    }
}