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<?php

    namespace Donut\RssFeed;

    use Donut\IProducer;
    use Donut\Manager;
    use Donut\Time;
    use Feed;
    use Nette\Http\Url;
    use Nette\Utils\Random;
    use Nette\Utils\Strings;
    use Nette\Utils\Json;
    use Nette\Utils\Validators;


    class FetchNewItems implements IProducer
    {
        /** @var string */
        private $queue;

        /** @var string */
        private $url;


        /**
         * @param  string
         * @param  string
         */
        public function __construct($queue, $url)
        {
            $this->queue = $queue;
            $this->url = $url;
        }


        /**
         * @return string
         */
        public function getUniqueId()
        {
            return $this->url;
        }


        /**
         * @return void
         */
        public function run(Manager $manager, Time $lastrun = NULL)
        {
            if ($lastrun === NULL) { // nedelame nic - prave ted zadne prispevky nepribyly
                return;
            }

            $checkDate = Time::sub($lastrun, 24 * 60); // akceptujeme prispevky az 24h zpetne
            $rss = Feed::loadRss($this->url);
            $baseUrl = new Url($this->url);

            foreach ($rss->item as $item) {
                $postDate = Time::create((int) (string) $item->timestamp);

                if ($postDate->isOlderThan($checkDate)) {
                    continue;
                }

                $postId = $this->getItemId($item);

                if ($manager->existsItem($this->url, $postId)) {
                    continue;
                }

                $manager->createMessage($this->queue, array(
                    'id' => $postId,
                    'title' => (string) $item->title,
                    'date' => $postDate->getValue(),
                    'text' => (string) $item->description,
                    'url' => $this->convertToUrl($item, $baseUrl),
                    'image' => NULL, // TODO
                ), $postDate);
                $manager->saveItem($this->url, $postId);
            }
        }


        private function getItemId($item)
        {
            if (isset($item->guid)) {
                return (string) $item->guid;
            }

            if (isset($content->link)) {
                return (string) $content->link;
            }

            $content = array();

            if (isset($content->title)) {
                $content[] = (string) $content->title;
            }

            if (isset($content->description)) {
                $content[] = (string) $content->description;
            }

            return !empty($content) ? md5(implode("\n", $content)) : Random::generate(20);
        }


        /**
         * @return string
         */
        private function convertToText(\SimpleXMLElement $post)
        {
            $content = $post->content;
            $contentType = (string) $content['type'];
            $contentText = (string) $content;

            if ($contentType === 'html') {
                $contentText = strip_tags($contentText);
            }

            return $contentText;
        }


        /**
         * @return string
         */
        private function convertToUrl(\SimpleXMLElement $post, Url $baseUrl)
        {
            $url = (string) $post->link;

            if (!Validators::isUrl($url)) {
                $newUrl = new Url;
                $newUrl->setScheme($baseUrl->getScheme());
                $newUrl->setPort($baseUrl->getPort());
                $newUrl->setHost($baseUrl->getHost());
                $newUrl->setUser($baseUrl->getUser());
                $newUrl->setPassword($baseUrl->getPassword());
                $newUrl->setPath($url);
                return (string) $newUrl;
            }

            return $url;
        }
    }