class MenuLinksTest

class MenuLinksTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'entity_test',
        'link',
        'menu_link_content',
        'router_test',
        'system',
        'user',
    ];
    
    /**
     * The menu link plugin manager.
     *
     * @var \Drupal\Core\Menu\MenuLinkManagerInterface
     */
    protected $menuLinkManager;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->menuLinkManager = \Drupal::service('plugin.manager.menu.link');
        $this->installSchema('user', [
            'users_data',
        ]);
        $this->installEntitySchema('entity_test_external');
        $this->installEntitySchema('menu_link_content');
        $this->installEntitySchema('user');
        Menu::create([
            'id' => 'menu-test',
            'label' => 'Test menu',
            'description' => 'Description text',
        ])->save();
    }
    
    /**
     * Create a simple hierarchy of links.
     */
    public function createLinkHierarchy($module = 'menu_test') {
        // First remove all the menu links in the menu.
        $this->menuLinkManager
            ->deleteLinksInMenu('menu-test');
        // Then create a simple link hierarchy:
        // - parent
        //   - child-1
        //     - child-1-1
        //     - child-1-2
        //   - child-2
        $base_options = [
            'title' => 'Menu link test',
            'provider' => $module,
            'menu_name' => 'menu-test',
        ];
        $parent = $base_options + [
            'link' => [
                'uri' => 'internal:/menu-test/hierarchy/parent',
            ],
        ];
        $link = MenuLinkContent::create($parent);
        $link->save();
        $links['parent'] = $link->getPluginId();
        $child_1 = $base_options + [
            'link' => [
                'uri' => 'internal:/menu-test/hierarchy/parent/child',
            ],
            'parent' => $links['parent'],
        ];
        $link = MenuLinkContent::create($child_1);
        $link->save();
        $links['child-1'] = $link->getPluginId();
        $child_1_1 = $base_options + [
            'link' => [
                'uri' => 'internal:/menu-test/hierarchy/parent/child2/child',
            ],
            'parent' => $links['child-1'],
        ];
        $link = MenuLinkContent::create($child_1_1);
        $link->save();
        $links['child-1-1'] = $link->getPluginId();
        $child_1_2 = $base_options + [
            'link' => [
                'uri' => 'internal:/menu-test/hierarchy/parent/child2/child',
            ],
            'parent' => $links['child-1'],
        ];
        $link = MenuLinkContent::create($child_1_2);
        $link->save();
        $links['child-1-2'] = $link->getPluginId();
        $child_2 = $base_options + [
            'link' => [
                'uri' => 'internal:/menu-test/hierarchy/parent/child',
            ],
            'parent' => $links['parent'],
        ];
        $link = MenuLinkContent::create($child_2);
        $link->save();
        $links['child-2'] = $link->getPluginId();
        return $links;
    }
    
    /**
     * Assert that at set of links is properly parented.
     *
     * @internal
     */
    public function assertMenuLinkParents(array $links, array $expected_hierarchy) : void {
        foreach ($expected_hierarchy as $id => $parent) {
            
            /** @var \Drupal\Core\Menu\MenuLinkInterface $menu_link_plugin  */
            $menu_link_plugin = $this->menuLinkManager
                ->createInstance($links[$id]);
            $expected_parent = $links[$parent] ?? '';
            $link_parent = $menu_link_plugin->getParent();
            $this->assertEquals($expected_parent, $link_parent, "Menu link {$id} has parent of {$link_parent}, expected {$expected_parent}.");
        }
    }
    
    /**
     * Assert that a link entity's created timestamp is set.
     */
    public function testCreateLink() : void {
        $options = [
            'menu_name' => 'menu-test',
            'bundle' => 'menu_link_content',
            'link' => [
                [
                    'uri' => 'internal:/',
                ],
            ],
            'title' => 'Link test',
        ];
        $link = MenuLinkContent::create($options);
        $link->save();
        // Make sure the changed timestamp is set.
        $this->assertGreaterThanOrEqual(\Drupal::time()->getRequestTime(), $link->getChangedTime(), 'Creating a menu link sets the "changed" timestamp.');
        $options = [
            'title' => 'Test Link',
        ];
        $link->link->options = $options;
        $link->changed->value = 0;
        $link->save();
        // Make sure the changed timestamp is updated.
        $this->assertGreaterThanOrEqual(\Drupal::time()->getRequestTime(), $link->getChangedTime(), 'Changing a menu link sets "changed" timestamp.');
    }
    
    /**
     * Tests that menu link pointing to entities get removed on entity remove.
     */
    public function testMenuLinkOnEntityDelete() : void {
        // Create user.
        $user = User::create([
            'name' => 'username',
        ]);
        $user->save();
        // Create External test entity.
        $external_entity = EntityTestExternal::create();
        $external_entity->save();
        // Ensure an external entity can be deleted.
        $external_entity->delete();
        // Create "canonical" menu link pointing to the user.
        $menu_link_content = MenuLinkContent::create([
            'title' => 'username profile',
            'menu_name' => 'menu-test',
            'link' => [
                [
                    'uri' => 'entity:user/' . $user->id(),
                ],
            ],
            'bundle' => 'menu_test',
        ]);
        $menu_link_content->save();
        // Create "collection" menu link pointing to the user listing page.
        $menu_link_content_collection = MenuLinkContent::create([
            'title' => 'users listing',
            'menu_name' => 'menu-test',
            'link' => [
                [
                    'uri' => 'internal:/' . $user->toUrl('collection')
                        ->getInternalPath(),
                ],
            ],
            'bundle' => 'menu_test',
        ]);
        $menu_link_content_collection->save();
        // Check is menu links present in the menu.
        $menu_tree_condition = (new MenuTreeParameters())->addCondition('route_name', 'entity.user.canonical');
        $this->assertCount(1, \Drupal::menuTree()->load('menu-test', $menu_tree_condition));
        $menu_tree_condition_collection = (new MenuTreeParameters())->addCondition('route_name', 'entity.user.collection');
        $this->assertCount(1, \Drupal::menuTree()->load('menu-test', $menu_tree_condition_collection));
        // Delete the user.
        $user->delete();
        // The "canonical" menu item has to be deleted.
        $this->assertCount(0, \Drupal::menuTree()->load('menu-test', $menu_tree_condition));
        // The "collection" menu item should still present in the menu.
        $this->assertCount(1, \Drupal::menuTree()->load('menu-test', $menu_tree_condition_collection));
    }
    
    /**
     * Tests automatic reparenting of menu links.
     */
    public function testMenuLinkReparenting($module = 'menu_test') : void {
        // Check the initial hierarchy.
        $links = $this->createLinkHierarchy($module);
        $expected_hierarchy = [
            'parent' => '',
            'child-1' => 'parent',
            'child-1-1' => 'child-1',
            'child-1-2' => 'child-1',
            'child-2' => 'parent',
        ];
        $this->assertMenuLinkParents($links, $expected_hierarchy);
        // Start over, and move child-1 under child-2, and check that all the
        // children of child-1 have been moved too.
        $links = $this->createLinkHierarchy($module);
        $this->menuLinkManager
            ->updateDefinition($links['child-1'], [
            'parent' => $links['child-2'],
        ]);
        // Verify that the entity was updated too.
        
        /** @var \Drupal\Core\Menu\MenuLinkInterface $menu_link_plugin  */
        $menu_link_plugin = $this->menuLinkManager
            ->createInstance($links['child-1']);
        $entity = \Drupal::service('entity.repository')->loadEntityByUuid('menu_link_content', $menu_link_plugin->getDerivativeId());
        $this->assertEquals($links['child-2'], $entity->getParentId());
        $expected_hierarchy = [
            'parent' => '',
            'child-1' => 'child-2',
            'child-1-1' => 'child-1',
            'child-1-2' => 'child-1',
            'child-2' => 'parent',
        ];
        $this->assertMenuLinkParents($links, $expected_hierarchy);
        // Start over, and delete child-1, and check that the children of child-1
        // have been reassigned to the parent.
        $links = $this->createLinkHierarchy($module);
        $this->menuLinkManager
            ->removeDefinition($links['child-1']);
        $expected_hierarchy = [
            'parent' => FALSE,
            'child-1-1' => 'parent',
            'child-1-2' => 'parent',
            'child-2' => 'parent',
        ];
        $this->assertMenuLinkParents($links, $expected_hierarchy);
        // Try changing the parent at the entity level.
        $definition = $this->menuLinkManager
            ->getDefinition($links['child-1-2']);
        $entity = MenuLinkContent::load($definition['metadata']['entity_id']);
        $entity->parent->value = '';
        $entity->save();
        $expected_hierarchy = [
            'parent' => '',
            'child-1-1' => 'parent',
            'child-1-2' => '',
            'child-2' => 'parent',
        ];
        $this->assertMenuLinkParents($links, $expected_hierarchy);
        // @todo Figure out what makes sense to test in terms of automatic
        //   re-parenting. https://www.drupal.org/node/2309531
    }
    
    /**
     * Tests the MenuLinkContent::preDelete function.
     */
    public function testMenuLinkContentReparenting() : void {
        // Add new menu items in a hierarchy.
        $parent = MenuLinkContent::create([
            'title' => $this->randomMachineName(8),
            'link' => [
                [
                    'uri' => 'internal:/',
                ],
            ],
            'menu_name' => 'main',
        ]);
        $parent->save();
        $child1 = MenuLinkContent::create([
            'title' => $this->randomMachineName(8),
            'link' => [
                [
                    'uri' => 'internal:/',
                ],
            ],
            'menu_name' => 'main',
            'parent' => 'menu_link_content:' . $parent->uuid(),
        ]);
        $child1->save();
        $child2 = MenuLinkContent::create([
            'title' => $this->randomMachineName(8),
            'link' => [
                [
                    'uri' => 'internal:/',
                ],
            ],
            'menu_name' => 'main',
            'parent' => 'menu_link_content:' . $child1->uuid(),
        ]);
        $child2->save();
        // Delete the middle child.
        $child1->delete();
        // Refresh $child2.
        $child2 = MenuLinkContent::load($child2->id());
        // Test the reference in the child.
        $this->assertSame('menu_link_content:' . $parent->uuid(), $child2->getParentId());
    }
    
    /**
     * Tests uninstalling a module providing default links.
     */
    public function testModuleUninstalledMenuLinks() : void {
        \Drupal::service('module_installer')->install([
            'menu_test',
        ]);
        \Drupal::service('plugin.manager.menu.link')->rebuild();
        $menu_links = $this->menuLinkManager
            ->loadLinksByRoute('menu_test.menu_test');
        $this->assertCount(1, $menu_links);
        $menu_link = reset($menu_links);
        $this->assertEquals('menu_test', $menu_link->getPluginId());
        // Uninstall the module and ensure the menu link got removed.
        \Drupal::service('module_installer')->uninstall([
            'menu_test',
        ]);
        \Drupal::service('plugin.manager.menu.link')->rebuild();
        $menu_links = $this->menuLinkManager
            ->loadLinksByRoute('menu_test.menu_test');
        $this->assertCount(0, $menu_links);
    }
    
    /**
     * Tests handling of pending revisions.
     *
     * @covers \Drupal\menu_link_content\Plugin\Validation\Constraint\MenuTreeHierarchyConstraintValidator::validate
     */
    public function testPendingRevisions() : void {
        
        /** @var \Drupal\Core\Entity\RevisionableStorageInterface $storage */
        $storage = \Drupal::entityTypeManager()->getStorage('menu_link_content');
        // Add new menu items in a hierarchy.
        $default_root_1_title = $this->randomMachineName(8);
        $root_1 = $storage->create([
            'title' => $default_root_1_title,
            'link' => [
                [
                    'uri' => 'internal:/#root_1',
                ],
            ],
            'menu_name' => 'menu-test',
        ]);
        $root_1->save();
        $default_child1_title = $this->randomMachineName(8);
        $child1 = $storage->create([
            'title' => $default_child1_title,
            'link' => [
                [
                    'uri' => 'internal:/#child1',
                ],
            ],
            'menu_name' => 'menu-test',
            'parent' => 'menu_link_content:' . $root_1->uuid(),
        ]);
        $child1->save();
        $default_child2_title = $this->randomMachineName(8);
        $child2 = $storage->create([
            'title' => $default_child2_title,
            'link' => [
                [
                    'uri' => 'internal:/#child2',
                ],
            ],
            'menu_name' => 'menu-test',
            'parent' => 'menu_link_content:' . $child1->uuid(),
        ]);
        $child2->save();
        $default_root_2_title = $this->randomMachineName(8);
        $root_2 = $storage->create([
            'title' => $default_root_2_title,
            'link' => [
                [
                    'uri' => 'internal:/#root_2',
                ],
            ],
            'menu_name' => 'menu-test',
        ]);
        $root_2->save();
        // Check that changing the title and the link in a pending revision is
        // allowed.
        $pending_child1_title = $this->randomMachineName(8);
        $child1_pending_revision = $storage->createRevision($child1, FALSE);
        $child1_pending_revision->set('title', $pending_child1_title);
        $child1_pending_revision->set('link', [
            [
                'uri' => 'internal:/#test',
            ],
        ]);
        $violations = $child1_pending_revision->validate();
        $this->assertEmpty($violations);
        $child1_pending_revision->save();
        $storage->resetCache();
        $child1_pending_revision = $storage->loadRevision($child1_pending_revision->getRevisionId());
        $this->assertFalse($child1_pending_revision->isDefaultRevision());
        $this->assertEquals($pending_child1_title, $child1_pending_revision->getTitle());
        $this->assertEquals('/#test', $child1_pending_revision->getUrlObject()
            ->toString());
        // Check that saving a pending revision does not affect the menu tree.
        $menu_tree = \Drupal::menuTree()->load('menu-test', new MenuTreeParameters());
        $parent_link = reset($menu_tree);
        $this->assertEquals($default_root_1_title, $parent_link->link
            ->getTitle());
        $this->assertEquals('/#root_1', $parent_link->link
            ->getUrlObject()
            ->toString());
        $child1_link = reset($parent_link->subtree);
        $this->assertEquals($default_child1_title, $child1_link->link
            ->getTitle());
        $this->assertEquals('/#child1', $child1_link->link
            ->getUrlObject()
            ->toString());
        $child2_link = reset($child1_link->subtree);
        $this->assertEquals($default_child2_title, $child2_link->link
            ->getTitle());
        $this->assertEquals('/#child2', $child2_link->link
            ->getUrlObject()
            ->toString());
        // Check that changing the parent in a pending revision is not allowed.
        $child2_pending_revision = $storage->createRevision($child2, FALSE);
        $child2_pending_revision->set('parent', $child1->id());
        $violations = $child2_pending_revision->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals('You can only change the hierarchy for the published version of this menu link.', $violations[0]->getMessage());
        $this->assertEquals('menu_parent', $violations[0]->getPropertyPath());
        // Check that changing the weight in a pending revision is not allowed.
        $child2_pending_revision = $storage->createRevision($child2, FALSE);
        $child2_pending_revision->set('weight', 500);
        $violations = $child2_pending_revision->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals('You can only change the hierarchy for the published version of this menu link.', $violations[0]->getMessage());
        $this->assertEquals('weight', $violations[0]->getPropertyPath());
        // Check that changing both the parent and the weight in a pending revision
        // is not allowed.
        $child2_pending_revision = $storage->createRevision($child2, FALSE);
        $child2_pending_revision->set('parent', $child1->id());
        $child2_pending_revision->set('weight', 500);
        $violations = $child2_pending_revision->validate();
        $this->assertCount(2, $violations);
        $this->assertEquals('You can only change the hierarchy for the published version of this menu link.', $violations[0]->getMessage());
        $this->assertEquals('You can only change the hierarchy for the published version of this menu link.', $violations[1]->getMessage());
        $this->assertEquals('menu_parent', $violations[0]->getPropertyPath());
        $this->assertEquals('weight', $violations[1]->getPropertyPath());
        // Check that changing the parent of a term which didn't have a parent
        // initially is not allowed in a pending revision.
        $root_2_pending_revision = $storage->createRevision($root_2, FALSE);
        $root_2_pending_revision->set('parent', $root_1->id());
        $violations = $root_2_pending_revision->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals('You can only change the hierarchy for the published version of this menu link.', $violations[0]->getMessage());
        $this->assertEquals('menu_parent', $violations[0]->getPropertyPath());
    }
    
    /**
     * Tests that getEntity() method returns correct value.
     */
    public function testMenuLinkContentGetEntity() : void {
        // Set up a custom menu link pointing to a specific path.
        $user = User::create([
            'name' => 'username',
        ]);
        $user->save();
        $title = $this->randomMachineName();
        $menu_link = MenuLinkContent::create([
            'title' => $title,
            'link' => [
                [
                    'uri' => 'internal:/' . $user->toUrl('collection')
                        ->getInternalPath(),
                ],
            ],
            'menu_name' => 'menu-test',
        ]);
        $menu_link->save();
        $menu_tree = \Drupal::menuTree()->load('menu-test', new MenuTreeParameters());
        $this->assertCount(1, $menu_tree);
        
        /** @var \Drupal\Core\Menu\MenuLinkTreeElement $tree_element */
        $tree_element = reset($menu_tree);
        $this->assertInstanceOf(MenuLinkContentPlugin::class, $tree_element->link);
        $this->assertInstanceOf(MenuLinkContent::class, $tree_element->link
            ->getEntity());
        $this->assertEquals($title, $tree_element->link
            ->getEntity()
            ->getTitle());
        $this->assertEquals($menu_link->id(), $tree_element->link
            ->getEntity()
            ->id());
    }
    
    /**
     * Tests that the form doesn't break for links with arbitrary menu names.
     */
    public function testMenuLinkContentFormInvalidParentMenu() : void {
        $menu_link = MenuLinkContent::create([
            'title' => 'Menu link test',
            'provider' => 'menu_link_content',
            'menu_name' => 'non-existent',
            'link' => [
                'uri' => 'internal:/user/login',
            ],
        ]);
        // Get the form for a new link, assert that building it doesn't break if
        // the links menu name doesn't exist.
        $build = \Drupal::service('entity.form_builder')->getForm($menu_link);
        static::assertIsArray($build);
    }

}