<?php

declare(strict_types=1);

/**
 * @author Robert Strutts <Bob_586@Yahoo.com>
 * @copyright (c) 2025, Robert Strutts
 * @license MIT
 */

namespace CodeHydrater;

class rss_feed {

    public static function generate_rss_feed(array $root, array $items) {

// Create the XML document
        $rss = new \DOMDocument('1.0', 'UTF-8');
        $rss->formatOutput = true;

// Create the RSS root element
        $rssElement = $rss->createElement('rss');
        $rssElement->setAttribute('version', '2.0');
        $rssElement->setAttribute('xmlns:atom', 'http://www.w3.org/2005/Atom');
        $rssRoot = $rss->appendChild($rssElement);

// Create the channel element
        $channel = $rss->createElement('channel');
        $channel = $rssRoot->appendChild($channel);

// Add atom:link for self-reference
        $atomLink = $rss->createElement('atom:link');
        $rss_feed_link = $root['feed_link'] ?? false;
        if ($rss_feed_link === false) {
            throw new \Exception("Unknown Feed Link");
        }
        $atomLink->setAttribute('href', $rss_feed_link);
        $atomLink->setAttribute('rel', 'self');
        $atomLink->setAttribute('type', 'application/rss+xml');
        $channel->appendChild($atomLink);

// Add required channel elements
        $title = $root["title"] ?? "News";
        $channel->appendChild($rss->createElement('title', $title));
        $site_link = $root["site_link"] ?? false;
        if ($site_link === false) {
            throw new \Exception("Unknown Site Link");
        }
        $channel->appendChild($rss->createElement('link', $site_link));
        $desc = $root["description"] ?? "Latest news from My Website";
        $channel->appendChild($rss->createElement('description', $desc));

// Optional channel elements
        $lang = $root['lang'] ?? "en-us";
        $channel->appendChild($rss->createElement('language', $lang));
        $pub_date = $root['pub_date'] ?? date(DATE_RSS);
        $channel->appendChild($rss->createElement('pubDate', $pub_date));
        $build_date = $root['last_build_date'] ?? date(DATE_RSS);
        $channel->appendChild($rss->createElement('lastBuildDate', $build_date));
        $channel->appendChild($rss->createElement('generator', 'RSS Generator'));

// Add items to the channel
        foreach ($items as $itemData) {
            $item = $rss->createElement('item');
            $item = $channel->appendChild($item);

            $item->appendChild($rss->createElement('title', $itemData['title']));
            $item->appendChild($rss->createElement('link', $itemData['link']));
            $item->appendChild($rss->createElement('description', $itemData['description']));
            $item->appendChild($rss->createElement('pubDate', $itemData['pubDate']));

            // GUID should be a permalink
            $guid = $rss->createElement('guid', $itemData['guid']);
            $guid->setAttribute('isPermaLink', 'true');
            $item->appendChild($guid);

            // Optional item elements
            if (isset($itemData['author'])) {
                $item->appendChild($rss->createElement('author', $itemData['author']));
            }
        }

        return $rss;
        
    }
    
    public static function save_to_xml_file(\DOMDocument $rss, string $filename = "feed") {
        if (! defined("BaseDir") ) {
            throw new \Exception("BaseDir not Set!");
        }
        $safe_file = BaseDir . "/public/" . preg_replace('/[^A-Za-z0-9]/', '', $filename) . ".xml";
        
        $result = $rss->save($safe_file);
        if ($result === false) {
            throw new \Exception("Failed to save RSS feed to file");
        }
        
//        echo "Saved XML file: " . $safe_file;
        
        return true;        
    }


    public static function output_rss(\DOMDocument $rss): void {
        // Set the content type to XML
        header('Content-Type: application/rss+xml; charset=utf-8');
        echo $rss->saveXML();        
    }
    
    public static function get_rss(\DOMDocument $rss): string {
        return $rss->saveXML();
    }
}


/**
// Sample items - in a real application, these would come from a database
        $items = [
            [
                'title' => 'First Article',
                'link' => 'http://example.com/article1',
                'description' => 'This is the description of the first article.',
                'pubDate' => date(DATE_RSS, strtotime('-2 days')),
                'guid' => 'http://example.com/article1',
                'author' => 'author@example.com (John Doe)'
            ],
            [
                'title' => 'Second Article',
                'link' => 'http://example.com/article2',
                'description' => 'This is the description of the second article.',
                'pubDate' => date(DATE_RSS, strtotime('-1 day')),
                'guid' => 'http://example.com/article2',
                'author' => 'author@example.com (Jane Smith)'
            ]
        ];
 */