class BreakpointManager

class BreakpointManager extends DefaultPluginManager implements BreakpointManagerInterface {
  use StringTranslationTrait;

  /**
   * {@inheritdoc}
   */
  protected $defaults = [
    // Human readable label for breakpoint.
    'label' => '',
    // The media query for the breakpoint.
    'mediaQuery' => '',
    // Weight used for ordering breakpoints.
    'weight' => 0,
    // Breakpoint multipliers.
    'multipliers' => [],
    // The breakpoint group.
    'group' => '',
    // Default class for breakpoint implementations.
    'class' => 'Drupal\\breakpoint\\Breakpoint',
    // The plugin id. Set by the plugin system based on the top-level YAML key.
    'id' => '',
  ];

  /**
   * The theme handler.
   *
   * @var \Drupal\Core\Extension\ThemeHandlerInterface
   */
  protected $themeHandler;

  /**
   * Static cache of breakpoints keyed by group.
   *
   * @var array
   */
  protected $breakpointsByGroup;

  /**
   * The plugin instances.
   *
   * @var array
   */
  protected $instances = [];

  /**
   * Constructs a new BreakpointManager instance.
   *
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler.
   * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
   *   The theme handler.
   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
   *   The cache backend.
   * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
   *   The string translation service.
   * @param \Drupal\Core\Extension\ModuleExtensionList|null $module_extension_list
   *   The module extension list.
   */
  public function __construct(ModuleHandlerInterface $module_handler, ThemeHandlerInterface $theme_handler, CacheBackendInterface $cache_backend, TranslationInterface $string_translation, ?ModuleExtensionList $module_extension_list = NULL) {
    $this->factory = new ContainerFactory($this);
    $this->moduleHandler = $module_handler;
    $this->themeHandler = $theme_handler;
    if ($module_extension_list === NULL) {
      @trigger_error('Calling ' . __METHOD__ . '() without the $module_extension_list argument is deprecated in drupal:10.3.0 and will be required in drupal:12.0.0. See https://www.drupal.org/node/3310017', E_USER_DEPRECATED);
      $module_extension_list = \Drupal::service('extension.list.module');
    }
    $this->moduleExtensionList = $module_extension_list;
    $this
      ->setStringTranslation($string_translation);
    $this
      ->alterInfo('breakpoints');
    $this
      ->setCacheBackend($cache_backend, 'breakpoints', [
      'breakpoints',
    ]);
  }

  /**
   * {@inheritdoc}
   */
  protected function getDiscovery() {
    if (!isset($this->discovery)) {
      $this->discovery = new YamlDiscovery('breakpoints', $this->moduleHandler
        ->getModuleDirectories() + $this->themeHandler
        ->getThemeDirectories());
      $this->discovery = new ContainerDerivativeDiscoveryDecorator($this->discovery);
    }
    return $this->discovery;
  }

  /**
   * {@inheritdoc}
   */
  public function processDefinition(&$definition, $plugin_id) {
    parent::processDefinition($definition, $plugin_id);

    // Allow custom groups and therefore more than one group per extension.
    if (empty($definition['group'])) {
      $definition['group'] = $definition['provider'];
    }

    // Ensure a 1x multiplier exists.
    if (!in_array('1x', $definition['multipliers'])) {
      $definition['multipliers'][] = '1x';
    }

    // Ensure that multipliers are sorted numerically so 1x, 1.5x and 2x
    // come out in that order instead of 1.5x, 1x, 2x.
    sort($definition['multipliers'], SORT_NUMERIC);
  }

  /**
   * {@inheritdoc}
   */
  protected function providerExists($provider) {
    return $this->moduleHandler
      ->moduleExists($provider) || $this->themeHandler
      ->themeExists($provider);
  }

  /**
   * {@inheritdoc}
   */
  public function getBreakpointsByGroup($group) {
    if (!isset($this->breakpointsByGroup[$group])) {
      if ($cache = $this->cacheBackend
        ->get($this->cacheKey . ':' . $group)) {
        $this->breakpointsByGroup[$group] = $cache->data;
      }
      else {
        $breakpoints = [];
        foreach ($this
          ->getDefinitions() as $plugin_id => $plugin_definition) {
          if ($plugin_definition['group'] == $group) {
            $breakpoints[$plugin_id] = $plugin_definition;
          }
        }
        uasort($breakpoints, [
          'Drupal\\Component\\Utility\\SortArray',
          'sortByWeightElement',
        ]);
        $this->cacheBackend
          ->set($this->cacheKey . ':' . $group, $breakpoints, Cache::PERMANENT, [
          'breakpoints',
        ]);
        $this->breakpointsByGroup[$group] = $breakpoints;
      }
    }
    $instances = [];
    foreach ($this->breakpointsByGroup[$group] as $plugin_id => $definition) {
      if (!isset($this->instances[$plugin_id])) {
        $this->instances[$plugin_id] = $this
          ->createInstance($plugin_id);
      }
      $instances[$plugin_id] = $this->instances[$plugin_id];
    }
    return $instances;
  }

  /**
   * {@inheritdoc}
   */
  public function getGroups() {

    // Use a double colon so as to not clash with the cache for each group.
    if ($cache = $this->cacheBackend
      ->get($this->cacheKey . '::groups')) {
      $groups = $cache->data;
    }
    else {
      $groups = [];
      foreach ($this
        ->getDefinitions() as $plugin_definition) {
        if (!isset($groups[$plugin_definition['group']])) {
          $groups[$plugin_definition['group']] = $plugin_definition['group'];
        }
      }
      $this->cacheBackend
        ->set($this->cacheKey . '::groups', $groups, Cache::PERMANENT, [
        'breakpoints',
      ]);
    }

    // Get the labels. This is not cacheable due to translation.
    $group_labels = [];
    foreach ($groups as $group) {
      $group_labels[$group] = $this
        ->getGroupLabel($group);
    }
    asort($group_labels);
    return $group_labels;
  }

  /**
   * {@inheritdoc}
   */
  public function getGroupProviders($group) {
    $providers = [];
    $breakpoints = $this
      ->getBreakpointsByGroup($group);
    foreach ($breakpoints as $breakpoint) {
      $provider = $breakpoint
        ->getProvider();
      $extension = FALSE;
      if ($this->moduleHandler
        ->moduleExists($provider)) {
        $extension = $this->moduleHandler
          ->getModule($provider);
      }
      elseif ($this->themeHandler
        ->themeExists($provider)) {
        $extension = $this->themeHandler
          ->getTheme($provider);
      }
      if ($extension) {
        $providers[$extension
          ->getName()] = $extension
          ->getType();
      }
    }
    return $providers;
  }

  /**
   * {@inheritdoc}
   */
  public function clearCachedDefinitions() {
    parent::clearCachedDefinitions();
    $this->breakpointsByGroup = NULL;
    $this->instances = [];
  }

  /**
   * Gets the label for a breakpoint group.
   *
   * @param string $group
   *   The breakpoint group.
   *
   * @return string
   *   The label.
   */
  protected function getGroupLabel($group) {

    // Extension names are not translatable.
    if ($this->moduleHandler
      ->moduleExists($group)) {
      $label = $this->moduleExtensionList
        ->getName($group);
    }
    elseif ($this->themeHandler
      ->themeExists($group)) {
      $label = $this->themeHandler
        ->getName($group);
    }
    else {

      // Custom group label that should be translatable.
      $label = $this
        ->t($group, [], [
        'context' => 'breakpoint',
      ]);
    }
    return $label;
  }

}