<?php

namespace PSX\Api;

use PSX\Schema\DefinitionsInterface;

/**
 * Specification
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 */
class Specification implements SpecificationInterface
{
    /** @var ResourceCollection */
    private $resourceCollection;

    /** @var DefinitionsInterface */
    private $definitions;

    public function __construct(ResourceCollection $resourceCollection, DefinitionsInterface $definitions)
    {
        $this->resourceCollection = $resourceCollection;
        $this->definitions = $definitions;
    }

    /**
     * @inheritDoc
     */
    public function getResourceCollection(): ResourceCollection
    {
        return $this->resourceCollection;
    }

    /**
     * @inheritDoc
     */
    public function getDefinitions(): DefinitionsInterface
    {
        return $this->definitions;
    }

    /**
     * @inheritDoc
     */
    public function get(string $path): ?SpecificationInterface
    {
        $resource = $this->getResourceCollection()->get($path);
        if (!$resource instanceof Resource) {
            return null;
        }

        return new Specification(
            new ResourceCollection([$resource]),
            $this->definitions
        );
    }

    /**
     * @param SpecificationInterface $specification
     */
    public function merge(SpecificationInterface $specification): void
    {
        foreach ($specification->getResourceCollection() as $resource) {
            $this->resourceCollection->set($resource);
        }

        $this->definitions->merge($specification->getDefinitions());
    }

    /**
     * @param Resource $resource
     * @param DefinitionsInterface $definitions
     * @return Specification
     */
    public static function fromResource(Resource $resource, DefinitionsInterface $definitions): Specification
    {
        $collection = new ResourceCollection();
        $collection->set($resource);

        return new static($collection, $definitions);
    }
}
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