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<?php

namespace Drupal\Core\Menu;

use Drupal\Component\Plugin\PluginInspectionInterface;
use Drupal\Component\Plugin\DerivativeInspectionInterface;
use Drupal\Core\Cache\CacheableDependencyInterface;

/**
 * Defines an interface for classes providing a type of menu link.
 */
interface MenuLinkInterface extends PluginInspectionInterface, DerivativeInspectionInterface, CacheableDependencyInterface {

  /**
   * Returns the weight of the menu link.
   *
   * @return int
   *   The weight of the menu link, 0 by default.
   */
  public function getWeight();

  /**
   * Returns the localized title to be shown for this link.
   *
   * @return string
   *   The title of the menu link.
   */
  public function getTitle();

  /**
   * Returns the description of the menu link.
   *
   * @return string
   *   The description of the menu link.
   */
  public function getDescription();

  /**
   * Returns the menu name of the menu link.
   *
   * @return string
   *   The menu name of the menu link.
   */
  public function getMenuName();

  /**
   * Returns the provider (module name) of the menu link.
   *
   * @return string
   *   The provider of the menu link.
   */
  public function getProvider();

  /**
   * Returns the plugin ID of the menu link's parent, or an empty string.
   *
   * @return string
   *   The parent plugin ID.
   */
  public function getParent();

  /**
   * Returns whether the menu link is enabled (not hidden).
   *
   * @return bool
   *   TRUE for enabled, FALSE otherwise.
   */
  public function isEnabled();

  /**
   * Returns whether the child menu links should always been shown.
   *
   * @return bool
   *   TRUE for expanded, FALSE otherwise.
   */
  public function isExpanded();

  /**
   * Returns whether this link can be reset.
   *
   * In general, only links that store overrides using the
   * menu_link.static.overrides service should return TRUE for this method.
   *
   * @return bool
   *   TRUE if it can be reset, FALSE otherwise.
   */
  public function isResettable();

  /**
   * Returns whether this link can be translated.
   *
   * @return bool
   *   TRUE if the link can be translated, FALSE otherwise.
   */
  public function isTranslatable();

  /**
   * Returns whether this link can be deleted.
   *
   * @return bool
   *   TRUE if the link can be deleted, FALSE otherwise.
   */
  public function isDeletable();

  /**
   * Returns the route name, if available.
   *
   * @return string
   *   The name of the route this menu link links to.
   */
  public function getRouteName();

  /**
   * Returns the route parameters, if available.
   *
   * @return array
   *   An array of parameter names and values.
   */
  public function getRouteParameters();

  /**
   * Returns a URL object containing either the external path or route.
   *
   * @param bool $title_attribute
   *   (optional) If TRUE, add the link description as the title attribute if
   *   the description is not empty.
   *
   * @return \Drupal\Core\Url
   *   A URL object containing either the external path or route.
   */
  public function getUrlObject($title_attribute = TRUE);

  /**
   * Returns the options for this link.
   *
   * @return array
   *   An associative array of options.
   */
  public function getOptions();

  /**
   * Returns any metadata for this link.
   *
   * @return array
   *   The metadata for the menu link.
   */
  public function getMetaData();

  /**
   * Updates the definition values for a menu link.
   *
   * Depending on the implementation details of the class, not all definition
   * values may be changed. For example, changes to the title of a static link
   * will be discarded.
   *
   * In general, this method should not be called directly, but will be called
   * automatically from MenuLinkManagerInterface::updateDefinition().
   *
   * @param array $new_definition_values
   *   The new values for the link definition. This will usually be just a
   *   subset of the plugin definition.
   * @param bool $persist
   *   TRUE to have the link persist the changed values to any additional
   *   storage.
   *
   * @return array
   *   The plugin definition incorporating any allowed changes.
   */
  public function updateLink(array $new_definition_values, $persist);

  /**
   * Deletes a menu link.
   *
   * In general, this method should not be called directly, but will be called
   * automatically from MenuLinkManagerInterface::removeDefinition().
   *
   * This method will only delete the link from any additional storage, but not
   * from the plugin.manager.menu.link service.
   *
   * @throws \Drupal\Component\Plugin\Exception\PluginException
   *   If the link is not deletable.
   */
  public function deleteLink();

  /**
   * Returns the name of a class that can build an editing form for this link.
   *
   * To instantiate the form class, use an instance of the
   * \Drupal\Core\DependencyInjection\ClassResolverInterface, such as from the
   * class_resolver service. Then call the setMenuLinkInstance() method on the
   * form instance with the menu link plugin instance.
   *
   * @todo Add a code example. https://www.drupal.org/node/2302849
   *
   * @return string
   *   A class that implements \Drupal\Core\Menu\Form\MenuLinkFormInterface.
   */
  public function getFormClass();

  /**
   * Returns route information for a route to delete the menu link.
   *
   * @return \Drupal\Core\Url|null
   *   A Url object, or NULL if there is no route (e.g. when the link is not
   *   deletable).
   */
  public function getDeleteRoute();

  /**
   * Returns route information for a custom edit form for the menu link.
   *
   * Plugins should return a value here if they have a special edit form, or if
   * they need to define additional local tasks, local actions, etc. that are
   * visible from the edit form.
   *
   * @return \Drupal\Core\Url|null
   *   A Url object, or NULL if there is no route because there is no custom
   *   edit route for this instance.
   */
  public function getEditRoute();

  /**
   * Returns route information for a route to translate the menu link.
   *
   * @return \Drupal\Core\Url|null
   *   A Url object, or NULL if there is no route (e.g. when the link is not
   *   translatable).
   */
  public function getTranslateRoute();

}