class ThemeInstaller

class ThemeInstaller implements ThemeInstallerInterface {
    use ModuleDependencyMessageTrait;
    use StringTranslationTrait;
    
    /**
     * @var \Drupal\Core\Extension\ThemeHandlerInterface
     */
    protected $themeHandler;
    
    /**
     * @var \Drupal\Core\Config\ConfigFactoryInterface
     */
    protected $configFactory;
    
    /**
     * @var \Drupal\Core\Config\ConfigInstallerInterface
     */
    protected $configInstaller;
    
    /**
     * @var \Drupal\Core\Extension\ModuleHandlerInterface
     */
    protected $moduleHandler;
    
    /**
     * @var \Drupal\Core\State\StateInterface
     */
    protected $state;
    
    /**
     * @var \Drupal\Core\Config\ConfigManagerInterface
     */
    protected $configManager;
    
    /**
     * @var \Drupal\Core\Asset\AssetCollectionOptimizerInterface
     */
    protected $cssCollectionOptimizer;
    
    /**
     * @var \Drupal\Core\Routing\RouteBuilderInterface
     */
    protected $routeBuilder;
    
    /**
     * @var \Psr\Log\LoggerInterface
     */
    protected $logger;
    
    /**
     * The module extension list.
     *
     * @var \Drupal\Core\Extension\ModuleExtensionList
     */
    protected $moduleExtensionList;
    
    /**
     * Constructs a new ThemeInstaller.
     *
     * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
     *   The theme handler.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The config factory to get the installed themes.
     * @param \Drupal\Core\Config\ConfigInstallerInterface $config_installer
     *   (optional) The config installer to install configuration. This optional
     *   to allow the theme handler to work before Drupal is installed and has a
     *   database.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler to fire themes_installed/themes_uninstalled hooks.
     * @param \Drupal\Core\Config\ConfigManagerInterface $config_manager
     *   The config manager used to uninstall a theme.
     * @param \Drupal\Core\Asset\AssetCollectionOptimizerInterface $css_collection_optimizer
     *   The CSS asset collection optimizer service.
     * @param \Drupal\Core\Routing\RouteBuilderInterface $route_builder
     *   (optional) The route builder service to rebuild the routes if a theme is
     *   installed.
     * @param \Psr\Log\LoggerInterface $logger
     *   A logger instance.
     * @param \Drupal\Core\State\StateInterface $state
     *   The state store.
     * @param \Drupal\Core\Extension\ModuleExtensionList $module_extension_list
     *   The module extension list.
     */
    public function __construct(ThemeHandlerInterface $theme_handler, ConfigFactoryInterface $config_factory, ConfigInstallerInterface $config_installer, ModuleHandlerInterface $module_handler, ConfigManagerInterface $config_manager, AssetCollectionOptimizerInterface $css_collection_optimizer, RouteBuilderInterface $route_builder, LoggerInterface $logger, StateInterface $state, ModuleExtensionList $module_extension_list = NULL) {
        $this->themeHandler = $theme_handler;
        $this->configFactory = $config_factory;
        $this->configInstaller = $config_installer;
        $this->moduleHandler = $module_handler;
        $this->configManager = $config_manager;
        $this->cssCollectionOptimizer = $css_collection_optimizer;
        $this->routeBuilder = $route_builder;
        $this->logger = $logger;
        $this->state = $state;
        if ($module_extension_list === NULL) {
            @trigger_error('The extension.list.module service must be passed to ' . __NAMESPACE__ . '\\ThemeInstaller::__construct(). It was added in drupal:8.9.0 and will be required before drupal:10.0.0.', E_USER_DEPRECATED);
            $module_extension_list = \Drupal::service('extension.list.module');
        }
        $this->moduleExtensionList = $module_extension_list;
    }
    
    /**
     * {@inheritdoc}
     */
    public function install(array $theme_list, $install_dependencies = TRUE) {
        $extension_config = $this->configFactory
            ->getEditable('core.extension');
        $theme_data = $this->themeHandler
            ->rebuildThemeData();
        $installed_themes = $extension_config->get('theme') ?: [];
        $installed_modules = $extension_config->get('module') ?: [];
        if ($install_dependencies) {
            $theme_list = array_combine($theme_list, $theme_list);
            if ($missing = array_diff_key($theme_list, $theme_data)) {
                // One or more of the given themes doesn't exist.
                throw new UnknownExtensionException('Unknown themes: ' . implode(', ', $missing) . '.');
            }
            // Only process themes that are not installed currently.
            if (!($theme_list = array_diff_key($theme_list, $installed_themes))) {
                // Nothing to do. All themes already installed.
                return TRUE;
            }
            $module_list = $this->moduleExtensionList
                ->getList();
            foreach ($theme_list as $theme => $value) {
                $module_dependencies = $theme_data[$theme]->module_dependencies;
                // $theme_data[$theme]->requires contains both theme and module
                // dependencies keyed by the extension machine names and
                // $theme_data[$theme]->module_dependencies contains only modules keyed
                // by the module extension machine name. Therefore we can find the theme
                // dependencies by finding array keys for 'requires' that are not in
                // $module_dependencies.
                $theme_dependencies = array_diff_key($theme_data[$theme]->requires, $module_dependencies);
                // We can find the unmet module dependencies by finding the module
                // machine names keys that are not in $installed_modules keys.
                $unmet_module_dependencies = array_diff_key($module_dependencies, $installed_modules);
                // Prevent themes with unmet module dependencies from being installed.
                if (!empty($unmet_module_dependencies)) {
                    $unmet_module_dependencies_list = implode(', ', array_keys($unmet_module_dependencies));
                    throw new MissingDependencyException("Unable to install theme: '{$theme}' due to unmet module dependencies: '{$unmet_module_dependencies_list}'.");
                }
                foreach ($module_dependencies as $dependency => $dependency_object) {
                    if ($incompatible = $this->checkDependencyMessage($module_list, $dependency, $dependency_object)) {
                        $sanitized_message = Html::decodeEntities(strip_tags($incompatible));
                        throw new MissingDependencyException("Unable to install theme: {$sanitized_message}");
                    }
                }
                // Add dependencies to the list of themes to install. The new themes
                // will be processed as the parent foreach loop continues.
                foreach (array_keys($theme_dependencies) as $dependency) {
                    if (!isset($theme_data[$dependency])) {
                        // The dependency does not exist.
                        return FALSE;
                    }
                    // Skip already installed themes.
                    if (!isset($theme_list[$dependency]) && !isset($installed_themes[$dependency])) {
                        $theme_list[$dependency] = $dependency;
                    }
                }
            }
            // Set the actual theme weights.
            $theme_list = array_map(function ($theme) use ($theme_data) {
                return $theme_data[$theme]->sort;
            }, $theme_list);
            // Sort the theme list by their weights (reverse).
            arsort($theme_list);
            $theme_list = array_keys($theme_list);
        }
        $themes_installed = [];
        foreach ($theme_list as $key) {
            // Only process themes that are not already installed.
            $installed = $extension_config->get("theme.{$key}") !== NULL;
            if ($installed) {
                continue;
            }
            // Throw an exception if the theme name is too long.
            if (strlen($key) > DRUPAL_EXTENSION_NAME_MAX_LENGTH) {
                throw new ExtensionNameLengthException("Theme name {$key} is over the maximum allowed length of " . DRUPAL_EXTENSION_NAME_MAX_LENGTH . ' characters.');
            }
            // Validate default configuration of the theme. If there is existing
            // configuration then stop installing.
            $this->configInstaller
                ->checkConfigurationToInstall('theme', $key);
            // The value is not used; the weight is ignored for themes currently. Do
            // not check schema when saving the configuration.
            $extension_config->set("theme.{$key}", 0)
                ->save(TRUE);
            // Reset theme settings.
            $theme_settings =& drupal_static('theme_get_setting');
            unset($theme_settings[$key]);
            // Reset theme listing.
            $this->themeHandler
                ->reset();
            // Only install default configuration if this theme has not been installed
            // already.
            if (!isset($installed_themes[$key])) {
                // Install default configuration of the theme.
                $this->configInstaller
                    ->installDefaultConfig('theme', $key);
            }
            $themes_installed[] = $key;
            // Record the fact that it was installed.
            $this->logger
                ->info('%theme theme installed.', [
                '%theme' => $key,
            ]);
        }
        $this->cssCollectionOptimizer
            ->deleteAll();
        $this->resetSystem();
        // Invoke hook_themes_installed() after the themes have been installed.
        $this->moduleHandler
            ->invokeAll('themes_installed', [
            $themes_installed,
        ]);
        return !empty($themes_installed);
    }
    
    /**
     * {@inheritdoc}
     */
    public function uninstall(array $theme_list) {
        $extension_config = $this->configFactory
            ->getEditable('core.extension');
        $theme_config = $this->configFactory
            ->getEditable('system.theme');
        $list = $this->themeHandler
            ->listInfo();
        foreach ($theme_list as $key) {
            if (!isset($list[$key])) {
                throw new UnknownExtensionException("Unknown theme: {$key}.");
            }
            if ($key === $theme_config->get('default')) {
                throw new \InvalidArgumentException("The current default theme {$key} cannot be uninstalled.");
            }
            if ($key === $theme_config->get('admin')) {
                throw new \InvalidArgumentException("The current administration theme {$key} cannot be uninstalled.");
            }
            // Base themes cannot be uninstalled if sub themes are installed, and if
            // they are not uninstalled at the same time.
            // @todo https://www.drupal.org/node/474684 and
            //   https://www.drupal.org/node/1297856 themes should leverage the module
            //   dependency system.
            if (!empty($list[$key]->sub_themes)) {
                foreach ($list[$key]->sub_themes as $sub_key => $sub_label) {
                    if (isset($list[$sub_key]) && !in_array($sub_key, $theme_list, TRUE)) {
                        throw new \InvalidArgumentException("The base theme {$key} cannot be uninstalled, because theme {$sub_key} depends on it.");
                    }
                }
            }
        }
        $this->cssCollectionOptimizer
            ->deleteAll();
        foreach ($theme_list as $key) {
            // The value is not used; the weight is ignored for themes currently.
            $extension_config->clear("theme.{$key}");
            // Reset theme settings.
            $theme_settings =& drupal_static('theme_get_setting');
            unset($theme_settings[$key]);
            // Remove all configuration belonging to the theme.
            $this->configManager
                ->uninstall('theme', $key);
        }
        // Don't check schema when uninstalling a theme since we are only clearing
        // keys.
        $extension_config->save(TRUE);
        // Refresh theme info.
        $this->resetSystem();
        $this->themeHandler
            ->reset();
        $this->moduleHandler
            ->invokeAll('themes_uninstalled', [
            $theme_list,
        ]);
    }
    
    /**
     * Resets some other systems like rebuilding the route information or caches.
     */
    protected function resetSystem() {
        if ($this->routeBuilder) {
            $this->routeBuilder
                ->setRebuildNeeded();
        }
        // @todo It feels wrong to have the requirement to clear the local tasks
        //   cache here.
        Cache::invalidateTags([
            'local_task',
        ]);
        $this->themeRegistryRebuild();
    }
    
    /**
     * Wraps drupal_theme_rebuild().
     */
    protected function themeRegistryRebuild() {
        drupal_theme_rebuild();
    }

}