<?php

declare(strict_types=1);

$rootPath = dirname(__DIR__);
$lockFile = $rootPath . '/storage/cron.lock';

if (is_file($lockFile) && (time() - filemtime($lockFile)) < 600) {
    fwrite(STDOUT, "Cron already running.\n");
    exit(0);
}

file_put_contents($lockFile, (string) time(), LOCK_EX);

try {
    $app = require $rootPath . '/app/bootstrap.php';

    if (!$app['database']->isConfigured()) {
        throw new RuntimeException('Database config missing.');
    }

    $pdo = $app['database']->pdo();

    $pendingRfid = (int) $pdo->query(
        'SELECT COUNT(*) FROM rfid_events WHERE status = "received"'
    )->fetchColumn();

    $summary = [
        'timestamp' => gmdate(DATE_ATOM),
        'pending_rfid_events' => $pendingRfid,
        'notes' => [
            'In diesem MVP dient Cron als technischer Haken fuer spaetere Reminder, Exporte und RFID-Regeln.',
        ],
    ];

    fwrite(STDOUT, json_encode($summary, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES) . PHP_EOL);
} catch (\Throwable $throwable) {
    fwrite(STDERR, $throwable->getMessage() . PHP_EOL);
    exit(1);
} finally {
    if (is_file($lockFile)) {
        unlink($lockFile);
    }
}