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<?php

    namespace Inteve\FeedGenerator\Feeds\Heureka;

    use Inteve\FeedGenerator\Feed;
    use Inteve\FeedGenerator\InvalidItemException;
    use Inteve\FeedGenerator\IOutput;
    use Inteve\FeedGenerator\Utils\Helpers;


    class HeurekaFeed extends Feed
    {
        /**
         * @return string
         */
        public function getContentType()
        {
            return 'text/xml';
        }


        /**
         * @return void
         * @throws InvalidItemException
         */
        public function generate(IOutput $output)
        {
            // https://sluzby.heureka.cz/napoveda/xml-feed/
            $output->open();
            $output->output('<?xml version="1.0" encoding="utf-8"?>');
            $output->output("\n");
            $output->output('<SHOP>');
            $output->output("\n");

            foreach ($this->items as $item) {
                if (!($item instanceof HeurekaItem)) {
                    throw new InvalidItemException('Feed item must be instance of HeurekaItem.');
                }

                $item->validate();

                $output->output("<SHOPITEM>\n");

                Helpers::writeXml($output, array(
                    'ITEM_ID' => $item->getId(),
                    'EAN' => $item->getEan(),
                    'PRODUCTNAME' => $item->getProductName(),
                    'DESCRIPTION' => $item->getDescription(),
                    'CATEGORYTEXT' => $item->getCategoryText(),
                    'URL' => $item->getUrl(),
                    'IMGURL' => $item->getImageUrl(),

                    // price & availability
                    'PRICE_VAT' => $item->getPrice(),
                    'DELIVERY_DATE' => $item->getDeliveryDate(),

                    // group ID
                    'ITEMGROUP_ID' => $item->getGroupId(),
                ));

                foreach ($item->getParameters() as $parameter) {
                    Helpers::writeXml($output, array(
                        'PARAM' => array(
                            'content' => array(
                                'PARAM_NAME' => $parameter->getName(),
                                'VAL' => $parameter->getValue() . $parameter->getUnit(),
                            ),
                        ),
                    ));
                }

                $output->output("</SHOPITEM>\n");
            }

            $output->output('</SHOP>');
            $output->output("\n");
            $output->close();
        }
    }