<?php

declare(strict_types=1);

namespace PHPUnit\Architecture\Builders;

use PHPUnit\Architecture\Elements\Layer\Layer;
use PHPUnit\Architecture\Services\ServiceContainer;
use PHPUnit\Architecture\Storage\ObjectsStorage;

trait BuildFromTest
{
    private static ?Layer $layer = null;

    public function layer(): Layer
    {
        if (self::$layer === null) {
            ServiceContainer::init($this->excludedPaths());

            self::$layer = new Layer(ObjectsStorage::getObjectMap());
        }

        return self::$layer;
    }

    /**
     * @return string[]
     */
    private function excludedPaths(): array
    {
        $defaultExcludedPaths = [
            'vendor',
        ];

        return property_exists($this, 'excludedPaths') && is_array($this->excludedPaths)
            ? array_merge($defaultExcludedPaths, $this->excludedPaths)
            : $defaultExcludedPaths;
    }
}