<?php

declare(strict_types=1);

use Weerscherm\BuienradarClient;
use Weerscherm\Config;
use Weerscherm\Http;
use Weerscherm\RadarService;

$root = dirname(__DIR__, 2);

require $root . '/src/autoload.php';

header('X-Robots-Tag: noindex');

$configFile = $root . '/config.php';
if (!is_file($configFile)) {
    http_response_code(500);
    header('Content-Type: text/plain; charset=utf-8');
    echo "config.php ontbreekt\n";
    exit;
}

try {
    $config = Config::load($configFile);
    $ttl = $config->get('cache_ttl')['radar'] ?? 240;

    $service = new RadarService(
        // Buienradar leidt door naar een CDN, dus deze client volgt redirects.
        new BuienradarClient(new Http(followRedirects: true)),
        rtrim((string) $config->get('storage_path'), '/') . '/cache/radar.gif',
        (int) $ttl,
    );
    $radar = $service->image();

    header('Content-Type: image/gif');
    header('Content-Length: ' . strlen($radar['bytes']));
    // De browser mag het beeld hergebruiken tot de radar zelf ververst is.
    header('Cache-Control: public, max-age=' . max(30, (int) $ttl - $radar['age']));
    header('X-Radar-Stale: ' . ($radar['stale'] ? '1' : '0'));
    echo $radar['bytes'];
} catch (Throwable $e) {
    error_log('weerscherm: radar: ' . $e->getMessage());
    http_response_code(503);
    header('Content-Type: text/plain; charset=utf-8');
    header('Cache-Control: no-store');
    echo "Radarbeeld niet beschikbaar\n";
}