class CronForm

class CronForm extends FormBase {
    use ConfigFormBaseTrait;
    
    /**
     * Stores the state storage service.
     *
     * @var \Drupal\Core\State\StateInterface
     */
    protected $state;
    
    /**
     * The cron service.
     *
     * @var \Drupal\Core\CronInterface
     */
    protected $cron;
    
    /**
     * The date formatter service.
     *
     * @var \Drupal\Core\Datetime\DateFormatterInterface
     */
    protected $dateFormatter;
    
    /**
     * The module handler service.
     *
     * @var \Drupal\Core\Extension\ModuleHandlerInterface
     */
    protected $moduleHandler;
    
    /**
     * Constructs a CronForm object.
     *
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The factory for configuration objects.
     * @param \Drupal\Core\State\StateInterface $state
     *   The state key value store.
     * @param \Drupal\Core\CronInterface $cron
     *   The cron service.
     * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
     *   The date formatter service.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler service.
     */
    public function __construct(ConfigFactoryInterface $config_factory, StateInterface $state, CronInterface $cron, DateFormatterInterface $date_formatter, ModuleHandlerInterface $module_handler) {
        $this->state = $state;
        $this->cron = $cron;
        $this->dateFormatter = $date_formatter;
        $this->moduleHandler = $module_handler;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getEditableConfigNames() {
        return [
            'system.cron',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('config.factory'), $container->get('state'), $container->get('cron'), $container->get('date.formatter'), $container->get('module_handler'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'system_cron_settings';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form['description'] = [
            '#markup' => '<p>' . t('Cron takes care of running periodic tasks like checking for updates and indexing content for search.') . '</p>',
        ];
        $form['run'] = [
            '#type' => 'submit',
            '#value' => t('Run cron'),
            '#submit' => [
                '::runCron',
            ],
        ];
        $status = '<p>' . $this->t('Last run: %time ago.', [
            '%time' => $this->dateFormatter
                ->formatTimeDiffSince($this->state
                ->get('system.cron_last')),
        ]) . '</p>';
        $form['status'] = [
            '#markup' => $status,
        ];
        $cron_url = Url::fromRoute('system.cron', [
            'key' => $this->state
                ->get('system.cron_key'),
        ], [
            'absolute' => TRUE,
        ])
            ->toString();
        $form['cron_url'] = [
            '#markup' => '<p>' . t('To run cron from outside the site, go to <a href=":cron" class="system-cron-settings__link">@cron</a>', [
                ':cron' => $cron_url,
                '@cron' => $cron_url,
            ]) . '</p>',
        ];
        if (!$this->moduleHandler
            ->moduleExists('automated_cron')) {
            $form['automated_cron'] = [
                '#markup' => $this->t('Enable the <em>Automated Cron</em> module to allow cron execution at the end of a server response.'),
            ];
        }
        $form['cron'] = [
            '#title' => t('Cron settings'),
            '#type' => 'details',
            '#open' => TRUE,
        ];
        $form['cron']['logging'] = [
            '#type' => 'checkbox',
            '#title' => t('Detailed cron logging'),
            '#default_value' => $this->config('system.cron')
                ->get('logging'),
            '#description' => $this->t('Run times of individual cron jobs will be written to watchdog'),
        ];
        $form['actions']['#type'] = 'actions';
        $form['actions']['submit'] = [
            '#type' => 'submit',
            '#value' => t('Save configuration'),
            '#button_type' => 'primary',
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $this->config('system.cron')
            ->set('logging', $form_state->getValue('logging'))
            ->save();
        $this->messenger()
            ->addStatus(t('The configuration options have been saved.'));
    }
    
    /**
     * Form submission handler for running cron manually.
     */
    public function runCron(array &$form, FormStateInterface $form_state) {
        if ($this->cron
            ->run()) {
            $this->messenger()
                ->addStatus($this->t('Cron ran successfully.'));
        }
        else {
            $this->messenger()
                ->addError($this->t('Cron run failed.'));
        }
    }

}