<?php


namespace FormForgeBundle\Twig\Loader;


use Doctrine\ORM\EntityManagerInterface;
use FormForgeBundle\Entity\FormForgeTemplate;
use FormForgeBundle\Entity\FormForgeType;
use Twig\Error\LoaderError;
use Twig\Loader\LoaderInterface;
use Twig\Source;


class DatabaseLoader implements LoaderInterface
{
    protected $repository;

    public function __construct(EntityManagerInterface $entityManager)
    {
        $this->repository = $entityManager->getRepository(FormForgeTemplate::class);

    }

    /**
     * Returns the source context for a given template logical name.
     *
     * @param string $name The template logical name
     *
     * @return Source
     *
     * @throws LoaderError When $name is not found
     */
    public function getSourceContext($name)
    {
        if (false === $template = $this->getTemplate($name)){
            throw new LoaderError(sprintf('Template "%s" does not exist.', $name));
        }

        return new Source($template->getContent(), $name);
    }

    /**
     * Gets the cache key to use for the cache for a given template name.
     *
     * @param string $name The name of the template to load
     *
     * @return string The cache key
     *
     * @throws LoaderError When $name is not found
     */
    public function getCacheKey($name)
    {
        if (false === $template = $this->getTemplate($name)){
            throw new LoaderError(sprintf('Template "%s" does not exist.', $name));
        }

        return $name;
    }

    /**
     * Returns true if the template is still fresh.
     *
     * @param string $name The template name
     * @param int $time Timestamp of the last modification time of the
     *                     cached template
     *
     * @return bool true if the template is fresh, false otherwise
     *
     * @throws LoaderError When $name is not found
     */
    public function isFresh($name, $time)
    {
        if (false === $template = $this->getTemplate($name)){
            throw new LoaderError(sprintf('Template "%s" does not exist.', $name));
        }

        return $template->getLastUpdated()->getTimestamp() <= $time;
    }

    /**
     * Check if we have the source code of a template, given its name.
     *
     * @param string $name The name of the template to check if we can load
     *
     * @return bool If the template source code is handled by this loader or not
     */
    public function exists($name)
    {
        return (bool)$this->getTemplate($name);
    }

    /**
     * @param $name
     * @return FormForgeType|object|null
     */
    protected function getTemplate($name)
    {
        return $this->repository->findOneBy(['twigName' => $name]);
    }

}