class InitSubscriber

class InitSubscriber implements EventSubscriberInterface {
    
    /**
     * A config object for the advagg_mod configuration.
     *
     * @var \Drupal\Core\Config\Config
     */
    protected $config;
    
    /**
     * A config object for the advagg configuration.
     *
     * @var \Drupal\Core\Config\Config
     */
    protected $advaggConfig;
    
    /**
     * The CSS translator service.
     *
     * @var \Drupal\advagg_mod\Asset\TranslateCss
     */
    protected $translator;
    
    /**
     * The CSS defer service.
     *
     * @var \Drupal\advagg_mod\Asset\DeferCss
     */
    protected $cssDeferer;
    
    /**
     * The JS defer service.
     *
     * @var \Drupal\advagg_mod\Asset\DeferJs
     */
    protected $jsDeferer;
    
    /**
     * The JS asyncer service.
     *
     * @var \Drupal\advagg_mod\Asset\AsyncJs
     */
    protected $jsAsyncer;
    
    /**
     * The Console.log remover.
     *
     * @var \Drupal\advagg_mod\Asset\RemoveConsoleLog
     */
    protected $consoleLogRemover;
    
    /**
     * The file system.
     *
     * @var \Drupal\Core\File\FileSystemInterface
     */
    protected $fileSystem;
    
    /**
     * Constructs the Subscriber object.
     *
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   A config factory for retrieving required config objects.
     * @param \Drupal\advagg_mod\Asset\TranslateCss $translator
     *   The translator service.
     * @param \Drupal\advagg_mod\Asset\DeferCss $deferer
     *   The CSS deferer.
     * @param \Drupal\Advagg_mod\Asset\AsyncJs $js_asyncer
     *   The JS asyncer.
     * @param \Drupal\advagg_mod\Asset\DeferJs $js_deferer
     *   The JS deferer.
     * @param \Drupal\Advagg_mod\Asset\RemoveConsoleLog $js_console_log
     *   The class to remove console.log() calls.
     * @param \Drupal\Core\File\FileSystemInterface $file_system
     *   The file system.
     */
    public function __construct(ConfigFactoryInterface $config_factory, TranslateCss $translator, DeferCss $deferer, AsyncJs $js_asyncer, DeferJs $js_deferer, RemoveConsoleLog $js_console_log, FileSystemInterface $file_system) {
        $this->config = $config_factory->getEditable('advagg_mod.settings');
        $this->advaggConfig = $config_factory->getEditable('advagg.settings');
        $this->translator = $translator;
        $this->cssDeferer = $deferer;
        $this->jsAsyncer = $js_asyncer;
        $this->jsDeferer = $js_deferer;
        $this->consoleLogRemover = $js_console_log;
        $this->fileSystem = $file_system;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents() {
        return [
            KernelEvents::REQUEST => [
                'onEvent',
                0,
            ],
            KernelEvents::RESPONSE => [
                [
                    'deferCss',
                    0,
                ],
                [
                    'deferJs',
                    0,
                ],
                [
                    'asyncJs',
                    0,
                ],
            ],
            AssetOptimizationEvent::CSS => [
                'translateCss',
                0,
            ],
            AssetOptimizationEvent::JS => [
                'removeConsoleLog',
                -10,
            ],
        ];
    }
    
    /**
     * Synchronize global_counter variable between sites.
     *
     * Only if using unified_multisite_dir.
     */
    public function onEvent() {
        $multisiteDir = $this->config
            ->get('unified_multisite_dir') ?? '';
        $dir = rtrim($multisiteDir, '/');
        if (empty($dir) || !file_exists($dir) || !is_dir($dir)) {
            return;
        }
        $counter_filename = $dir . '/_global_counter';
        $local_counter = $this->advaggConfig
            ->get('global_counter');
        if (!file_exists($counter_filename)) {
            $this->fileSystem
                ->saveData($local_counter, $counter_filename, FileSystemInterface::EXISTS_REPLACE);
        }
        else {
            $shared_counter = (int) file_get_contents($counter_filename);
            if ($shared_counter == $local_counter) {
                // Counters are the same, return.
                return;
            }
            elseif ($shared_counter < $local_counter) {
                // Local counter is higher, update saved file and return.
                $this->fileSystem
                    ->saveData($local_counter, $counter_filename, FileSystemInterface::EXISTS_REPLACE);
                return;
            }
            elseif ($shared_counter > $local_counter) {
                // Shared counter is higher, update local copy and return.
                $this->advaggConfig
                    ->set('global_counter', $shared_counter)
                    ->save();
                return;
            }
        }
    }
    
    /**
     * Pass the CSS to the translator.
     *
     * @param \Drupal\advagg\Asset\AssetOptimizationEvent $assetOptimizationEvent
     *   The CSS optimization event.
     */
    public function translateCss(AssetOptimizationEvent $assetOptimizationEvent) {
        // Skip if not enabled.
        if (!$this->config
            ->get('css_translate')) {
            return;
        }
        $content = $assetOptimizationEvent->getContent();
        $content = $this->translator
            ->optimize($content, [], []);
        $assetOptimizationEvent->setContent($content);
    }
    
    /**
     * Pass the JS to the modifier if enabled to remove console logging.
     *
     * @param \Drupal\advagg\Asset\AssetOptimizationEvent $assetOptimizationEvent
     *   The JS optimization event.
     */
    public function removeConsoleLog(AssetOptimizationEvent $assetOptimizationEvent) {
        // Skip if not enabled.
        if (!$this->config
            ->get('js_remove_console_log')) {
            return;
        }
        $content = $assetOptimizationEvent->getContent();
        $content = $this->consoleLogRemover
            ->optimize($content);
        $assetOptimizationEvent->setContent($content);
    }
    
    /**
     * Apply CSS defer actions.
     *
     * @param \Symfony\Component\HttpKernel\Event\ResponseEvent $event
     *   The response event object.
     */
    public function deferCss(ResponseEvent $event) {
        // Skip if not enabled.
        if (!advagg_mod_css_defer_active()) {
            return;
        }
        $response = $event->getResponse();
        // Only process Html Responses.
        if (!$response instanceof HtmlResponse) {
            return;
        }
        $content = $this->cssDeferer
            ->defer($response->getContent());
        $response->setContent($content);
    }
    
    /**
     * Apply defer JS changes.
     *
     * @param \Symfony\Component\HttpKernel\Event\ResponseEvent $event
     *   The response event object.
     */
    public function deferJs(ResponseEvent $event) {
        // Skip if not enabled.
        if (!$this->config
            ->get('js_defer')) {
            return;
        }
        $response = $event->getResponse();
        // Only process Html Responses.
        if (!$response instanceof HtmlResponse) {
            return;
        }
        $content = $this->jsDeferer
            ->defer($response->getContent());
        $response->setContent($content);
    }
    
    /**
     * Apply CSS defer actions.
     *
     * @param \Symfony\Component\HttpKernel\Event\ResponseEvent $event
     *   The response event object.
     */
    public function asyncJs(ResponseEvent $event) {
        // Skip if not enabled.
        if (!$this->config
            ->get('js_async') || $this->config
            ->get('js_defer')) {
            return;
        }
        $response = $event->getResponse();
        // Only process Html Responses.
        if (!$response instanceof HtmlResponse) {
            return;
        }
        $content = $this->jsAsyncer
            ->async($response->getContent());
        $response->setContent($content);
    }

}