<?php

// /blog/feed — sidecar-only (no index.twig), like sitemap.xml/search: no
// point rendering Twig just to return XML. Project-owned (App/pages/),
// since this is blog content specifically, not generic framework
// machinery like sitemap.xml/search are. Deliberately has zero dependency
// on the (off-by-default) content index — it reads the exact same
// hand-written $posts array App/pages/blog/index.php itself renders from,
// so this feed works on a bare install with content_index_enabled left at
// its shipped default of false. Only the per-tag variant
// (App/pages/blog/tag/[tag]/feed/index.php) needs the content index, since
// tags only exist there.

use App\Response;
use Lib\Rss;

$config = require __DIR__ . '/../../../../novaconium/config.php';
$appConfigFile = __DIR__ . '/../../../../App/config.php';
if (is_file($appConfigFile)) {
    $config = array_merge($config, require $appConfigFile);
}

$posts = (require __DIR__ . '/../index.php')['posts'];

// Newest first, the RSS convention — the array itself (and therefore the
// /blog listing page, which isn't touched here) keeps its own order;
// sorting only affects this feed's output.
usort($posts, fn (array $a, array $b) => strcmp($b['published'], $a['published']));

$items = array_map(
    fn (array $post) => [
        'title'            => $post['title'],
        'link'             => '/blog/' . $post['slug'],
        'guid'             => '/blog/' . $post['slug'],
        'pubDateTimestamp' => strtotime($post['published']),
        'description'      => $post['excerpt'],
    ],
    $posts
);

$xml = Rss::render(
    $config['site_name'] . ' Blog',
    '/blog',
    'Posts from ' . $config['site_name'] . '.',
    $items
);

return Response::xml($xml);