<?php

/*
 * This file is part of the Thelia package.
 * http://www.thelia.net
 *
 * (c) OpenStudio <info@thelia.net>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Front\Controller;

use Symfony\Component\Cache\Adapter\AdapterInterface;
use Thelia\Controller\Front\BaseFrontController;
use Thelia\Core\HttpFoundation\Request;
use Thelia\Core\HttpFoundation\Response;
use Thelia\Model\BrandQuery;
use Thelia\Model\CategoryQuery;
use Thelia\Model\ConfigQuery;
use Thelia\Model\FolderQuery;
use Thelia\Model\Lang;
use Thelia\Model\LangQuery;

/**
 * Controller uses to generate RSS Feeds.
 *
 * A default cache of 2 hours is used to avoid attack. You can flush cache if you have `ADMIN` role and pass flush=1 in
 * query string parameter.
 *
 * @author Julien Chanséaume <jchanseaume@openstudio.fr>
 */
class FeedController extends BaseFrontController
{
    /**
     * Folder name for feeds cache.
     */
    public const FEED_CACHE_DIR = 'feeds';

    /**
     * Key prefix for feed cache.
     */
    public const FEED_CACHE_KEY = 'feed';

    /**
     * render the RSS feed.
     *
     * @param $context string   The context of the feed : catalog, content. default: catalog
     * @param $lang    string      The lang of the feed : fr_FR, en_US, ... default: default language of the site
     * @param $id      string        The id of the parent element. The id of the main parent category for catalog context.
     *                  The id of the content folder for content context
     *
     * @throws \RuntimeException
     *
     * @return Response
     */
    public function generateAction($context, $lang, $id)
    {
        /** @var Request $request */
        $request = $this->getRequest();

        // context
        if ('' === $context) {
            $context = 'catalog';
        } elseif (!\in_array($context, ['catalog', 'content', 'brand'])) {
            $this->pageNotFound();
        }

        // the locale : fr_FR, en_US,
        if ('' !== $lang) {
            if (!$this->checkLang($lang)) {
                $this->pageNotFound();
            }
        } else {
            try {
                $lang = Lang::getDefaultLanguage();
                $lang = $lang->getLocale();
            } catch (\RuntimeException $ex) {
                // @todo generate error page
                throw new \RuntimeException('No default language is defined. Please define one.');
            }
        }
        if (null === $lang = LangQuery::create()->findOneByLocale($lang)) {
            $this->pageNotFound();
        }
        $lang = $lang->getId();

        // check if element exists and is visible
        if ('' !== $id) {
            if (false === $this->checkId($context, $id)) {
                $this->pageNotFound();
            }
        }

        $flush = $request->query->get('flush', '');

        /** @var AdapterInterface $cacheAdapter */
        $cacheAdapter = $this->container->get('thelia.cache');

        $cacheKey = self::FEED_CACHE_KEY.$lang.$context;

        $cacheItem = $cacheAdapter->getItem($cacheKey);

        if (!$cacheItem->isHit() || $flush) {
            $cacheExpire = (int) (ConfigQuery::read('feed_ttl', '7200')) ?: 7200;

            // render the view
            $cacheContent = $this->renderRaw(
                'feed',
                [
                    '_context_' => $context,
                    '_lang_' => $lang,
                    '_id_' => $id,
                ]
            );

            $cacheItem->expiresAfter($cacheExpire);
            $cacheItem->set($cacheContent);
            $cacheAdapter->save($cacheItem);
        }

        $response = new Response();
        $response->setContent($cacheItem->get());
        $response->headers->set('Content-Type', 'application/rss+xml');

        return $response;
    }

    /**
     * get the cache directory for feeds.
     *
     * @return mixed|string
     */
    protected function getCacheDir()
    {
        $cacheDir = $this->container->getParameter('kernel.cache_dir');
        $cacheDir = rtrim($cacheDir, '/');
        $cacheDir .= '/'.self::FEED_CACHE_DIR.'/';

        return $cacheDir;
    }

    /**
     * Check if current user has ADMIN role.
     *
     * @return bool
     */
    protected function checkAdmin()
    {
        return $this->getSecurityContext()->hasAdminUser();
    }

    /**
     * Check if a lang is used.
     *
     * @param $lang string  The lang code. e.g.: fr
     *
     * @return bool true if the language is used, otherwise false
     */
    private function checkLang($lang)
    {
        // load locals
        $lang = LangQuery::create()
            ->findOneByLocale($lang);

        return null !== $lang;
    }

    /**
     * Check if the element exists and is visible.
     *
     * @param $context string   catalog or content
     * @param $id      string        id of the element
     *
     * @return bool
     */
    private function checkId($context, $id)
    {
        $ret = false;
        if (is_numeric($id)) {
            if ('catalog' === $context) {
                $cat = CategoryQuery::create()->findPk($id);
                $ret = (null !== $cat && $cat->getVisible());
            } elseif ('brand' === $context) {
                $brand = BrandQuery::create()->findPk($id);
                $ret = (null !== $brand && $brand->getVisible());
            } else {
                $folder = FolderQuery::create()->findPk($id);
                $ret = (null !== $folder && $folder->getVisible());
            }
        }

        return $ret;
    }
}