final class KE_DBKE_Cron {

    public static function init(): void {

        add_filter(
            'cron_schedules',
            [self::class, 'register_schedules']
        );

        add_action(
            'ke_dbke_monthly_billing',
            [self::class, 'run_monthly_billing']
        );

    }

    public static function register_schedules($schedules) {

        $schedules['monthly'] = [
            'interval' => 30 * DAY_IN_SECONDS,
            'display'  => 'Once Monthly'
        ];

        return $schedules;
    }

    public static function run_monthly_billing(): void {

        $lock_key = 'ke_dbke_monthly_billing_lock';

        if (get_transient($lock_key)) {
            return;
        }

        set_transient($lock_key, 1, 30 * MINUTE_IN_SECONDS);

        try {

            // Optional: run only on 1st of month
            if (date('j') !== '1') {
                return;
            }

            KE_DBKE_Billing_Service::process_monthly_storage_fees();

            update_option(
                'ke_dbke_last_monthly_billing_run',
                current_time('mysql')
            );

        } catch (Throwable $e) {

            error_log('DBKE Monthly Billing Error: ' . $e->getMessage());

            update_option(
                'ke_dbke_last_monthly_billing_error',
                $e->getMessage()
            );

        } finally {

            delete_transient($lock_key);
        }
    }
}<?xml version="1.0" encoding="UTF-8"?>
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