<?php
require __DIR__ . '/common.php';

const SITE = 'https://www.silly.be';
const EVENTS_API = SITE . '/agenda/@results';
const PAGE_SIZE = 20;
const MAX_PAGES = 2;

function fetch_all_events(): array
{
    $items = [];
    for ($page = 0; $page < MAX_PAGES; $page++) {
        $bStart = $page * PAGE_SIZE;
        $url = EVENTS_API . '?b_size=' . PAGE_SIZE . '&b_start=' . $bStart;
        $data = json_decode(http_get($url), true);
        $pageItems = $data['items'] ?? [];
        if (empty($pageItems)) {
            break;
        }
        $items = array_merge($items, $pageItems);
        if (count($items) >= ($data['items_total'] ?? 0)) {
            break;
        }
    }
    return $items;
}

function format_event_meta(array $item): string
{
    $parts = [];
    $start = !empty($item['start']) ? new DateTime($item['start']) : null;
    $end = !empty($item['end']) ? new DateTime($item['end']) : null;

    if ($start) {
        $parts[] = !empty($item['whole_day'])
            ? 'Le ' . $start->format('d/m/Y')
            : 'Le ' . $start->format('d/m/Y à H:i');
    }
    if ($end && (!$start || $end->format('Y-m-d') !== $start->format('Y-m-d'))) {
        $parts[] = "jusqu'au " . $end->format('d/m/Y H:i');
    }
    $address = implode(', ', array_filter([$item['street'] ?? null, $item['zipcode'] ?? null, $item['city'] ?? null]));
    if ($address) {
        $parts[] = "Lieu : $address";
    }
    return implode(' — ', $parts);
}

function build_events_feed(): string
{
    $items = [];
    foreach (fetch_all_events() as $item) {
        $id = basename(rtrim($item['@id'] ?? '', '/'));
        $summary = strip_html($item['description_fr'] ?? $item['description'] ?? null);
        $meta = format_event_meta($item);
        $description = implode(' | ', array_filter([$meta, $summary]));
        $items[] = [
            'title' => $item['title_fr'] ?? $item['title'] ?? '(sans titre)',
            'link' => SITE . '/agenda?event=' . rawurlencode($id),
            'guid' => $item['UID'] ?? $id,
            'pubDate' => $item['created'] ?? $item['start'] ?? null,
            'description' => $description,
        ];
    }
    return build_rss(
        'Silly.be - Agenda',
        SITE . '/agenda',
        "Agenda / événements de la commune de Silly (Belgique)",
        $items
    );
}

serve_cached_feed('agenda', 'build_events_feed');