class AnnouncementsFeedHooks

class AnnouncementsFeedHooks {
    
    /**
     * Implements hook_help().
     */
    public function help($route_name, RouteMatchInterface $route_match) {
        switch ($route_name) {
            case 'help.page.announcements_feed':
                $output = '';
                $output .= '<h2>' . t('About') . '</h2>';
                $output .= '<p>' . t('The Announcements module displays announcements from the Drupal community. For more information, see the <a href=":documentation">online documentation for the Announcements module</a>.', [
                    ':documentation' => 'https://www.drupal.org/docs/core-modules-and-themes/core-modules/announcements-feed',
                ]) . '</p>';
                $output .= '<h2>' . t('Uses') . '</h2>';
                $output .= '<dl><dt>' . t('Accessing announcements') . '</dt>';
                $output .= '<dd>' . t('Users with the "View drupal.org announcements" permission may click on the "Announcements" item in the administration toolbar, or access @link, to see all announcements relevant to the Drupal version of your site.', [
                    '@link' => Link::createFromRoute(t('Announcements'), 'announcements_feed.announcement')->toString(),
                ]) . '</dd>';
                $output .= '</dl>';
                return $output;
        }
    }
    
    /**
     * Implements hook_toolbar().
     */
    public function toolbar() {
        if (!\Drupal::currentUser()->hasPermission('access announcements')) {
            return [
                '#cache' => [
                    'contexts' => [
                        'user.permissions',
                    ],
                ],
            ];
        }
        $items['announcement'] = [
            '#type' => 'toolbar_item',
            'tab' => [
                '#lazy_builder' => [
                    'announcements_feed.lazy_builders:renderAnnouncements',
                    [],
                ],
                '#create_placeholder' => TRUE,
                '#cache' => [
                    'tags' => [
                        'announcements_feed:feed',
                    ],
                ],
            ],
            '#wrapper_attributes' => [
                'class' => [
                    'announce-toolbar-tab',
                ],
            ],
            '#cache' => [
                'contexts' => [
                    'user.permissions',
                ],
            ],
            '#weight' => 3399,
        ];
        // \Drupal\toolbar\Element\ToolbarItem::preRenderToolbarItem adds an
        // #attributes property to each toolbar item's tab child automatically.
        // Lazy builders don't support an #attributes property so we need to
        // add another render callback to remove the #attributes property. We start by
        // adding the defaults, and then we append our own pre render callback.
        $items['announcement'] += \Drupal::service('plugin.manager.element_info')->getInfo('toolbar_item');
        $items['announcement']['#pre_render'][] = [
            RenderCallbacks::class,
            'removeTabAttributes',
        ];
        return $items;
    }
    
    /**
     * Implements hook_toolbar_alter().
     */
    public function toolbarAlter(&$items) {
        // As the "Announcements" link is shown already in the top toolbar bar, we
        // don't need it again in the administration menu tray, so hide it.
        if (!empty($items['administration']['tray'])) {
            $callable = function (array $element) {
                unset($element['administration_menu']['#items']['announcements_feed.announcement']);
                return $element;
            };
            $items['administration']['tray']['toolbar_administration']['#pre_render'][] = $callable;
        }
    }
    
    /**
     * Implements hook_theme().
     */
    public function theme($existing, $type, $theme, $path) : array {
        return [
            'announcements_feed' => [
                'variables' => [
                    'featured' => NULL,
                    'standard' => NULL,
                    'count' => 0,
                    'feed_link' => '',
                ],
            ],
            'announcements_feed_admin' => [
                'variables' => [
                    'featured' => NULL,
                    'standard' => NULL,
                    'count' => 0,
                    'feed_link' => '',
                ],
            ],
        ];
    }
    
    /**
     * Implements hook_cron().
     */
    public function cron() {
        $config = \Drupal::config('announcements_feed.settings');
        $interval = $config->get('cron_interval');
        $last_check = \Drupal::state()->get('announcements_feed.last_fetch', 0);
        $time = \Drupal::time()->getRequestTime();
        if ($time - $last_check > $interval) {
            \Drupal::service('announcements_feed.fetcher')->fetch(TRUE);
            \Drupal::state()->set('announcements_feed.last_fetch', $time);
        }
    }

}