<?php

namespace Providers;

require_once('Provider.php');
require_once('Item.php');

class Rss extends \Providers\Provider {

    private $_feedUrl;
    private $_feedXml;

    public function __construct($feed, $options=[]) {
        parent::__construct($feed, $options);
        $config = json_decode(file_get_contents('../config/rss.json'), TRUE);
        if (isset($config[$feed])) {
            $this->_feedUrl = $config[$feed];
        } else {
            throw new Exception('RSS feed "' . $feed . '" undefined');
        }
    }

    protected function _getCachePath() {
        return '../cache/rss.%s';
    }

    protected function _fetchItems() {
        $this->_feedXml = new \SimpleXMLElement($this->_feedUrl, 0, TRUE);
        $feedItems = $this->_feedXml->channel->item ?: $this->_feedXml->entry;
        $items = [];
        foreach ($feedItems as $item) {
            $items[] = $item->asXML();
        }
        return $items;
    }

    protected function _mapItems($content) {
        $items = [];
        foreach ($content as $contentString) {
            $item = new \SimpleXMLElement(str_replace('content:encoded>', 'content>', $contentString));
            $itemObject = new Item();
            $itemObject->ID = strval($item->id ?: $item->guid);
            $itemObject->Title = strval($item->title);
            $itemObject->Time = strval($item->published ?: $item->pubDate);
            $itemObject->Text = strval($item->summary ?: $item->description ?: $item->content);
            $itemObject->Link = strval(isset($item->link['href']) ? $item->link->attributes()['href'] : $item->link);
            $itemObject->Author = strval(is_string($item->author) ? $item->author : $item->author->name);
            $items[] = $itemObject;
        }
        return $items;
    }

    protected function _spamFilter($content) {
        return $content;
    }

    protected function _sortContent($content) {
        return $content;
    }

    public function title() {
        $cacheFile = sprintf($this->_getCachePath() . '.title', $this->_feed);
        if (!file_exists($cacheFile)) {
            $this->_fetchItems();
        }
        if ($this->_feedXml) {
            $title = strval($this->_feedXml->title ?: $this->_feedXml->channel->title);
            file_put_contents($cacheFile, $title);
            return $title;
        } else {
            return file_get_contents($cacheFile);
        }
    }

}

?>