class SystemMenuBlockTest

class SystemMenuBlockTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
        'block',
        'menu_test',
        'menu_link_content',
        'field',
        'user',
        'link',
    ];
    
    /**
     * The block under test.
     *
     * @var \Drupal\system\Plugin\Block\SystemMenuBlock
     */
    protected $block;
    
    /**
     * The menu for testing.
     *
     * @var \Drupal\system\MenuInterface
     */
    protected $menu;
    
    /**
     * The menu link tree service.
     *
     * @var \Drupal\Core\Menu\MenuLinkTree
     */
    protected $linkTree;
    
    /**
     * The menu link plugin manager service.
     *
     * @var \Drupal\Core\Menu\MenuLinkManagerInterface
     */
    protected $menuLinkManager;
    
    /**
     * The block manager service.
     *
     * @var \Drupal\Core\block\BlockManagerInterface
     */
    protected $blockManager;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installEntitySchema('user');
        $this->installEntitySchema('menu_link_content');
        $account = User::create([
            'name' => $this->randomMachineName(),
            'status' => 1,
        ]);
        $account->save();
        $this->container
            ->get('current_user')
            ->setAccount($account);
        $this->menuLinkManager = $this->container
            ->get('plugin.manager.menu.link');
        $this->linkTree = $this->container
            ->get('menu.link_tree');
        $this->blockManager = $this->container
            ->get('plugin.manager.block');
        $routes = new RouteCollection();
        $requirements = [
            '_access' => 'TRUE',
        ];
        $options = [
            '_access_checks' => [
                'access_check.default',
            ],
        ];
        $routes->add('example1', new Route('/example1', [], $requirements, $options));
        $routes->add('example2', new Route('/example2', [], $requirements, $options));
        $routes->add('example3', new Route('/example3', [], $requirements, $options));
        $routes->add('example4', new Route('/example4', [], $requirements, $options));
        $routes->add('example5', new Route('/example5', [], $requirements, $options));
        $routes->add('example6', new Route('/example6', [], $requirements, $options));
        $routes->add('example7', new Route('/example7', [], $requirements, $options));
        $routes->add('example8', new Route('/example8', [], $requirements, $options));
        $mock_route_provider = new MockRouteProvider($routes);
        $this->container
            ->set('router.route_provider', $mock_route_provider);
        // Add a new custom menu.
        $menu_name = 'mock';
        $label = $this->randomMachineName(16);
        $this->menu = Menu::create([
            'id' => $menu_name,
            'label' => $label,
            'description' => 'Description text',
        ]);
        $this->menu
            ->save();
        // This creates a tree with the following structure:
        // - 1
        // - 2
        //   - 3
        //     - 4
        // - 5
        //   - 7
        // - 6
        // - 8
        // With link 6 being the only external link.
        $links = [
            1 => MenuLinkMock::create([
                'id' => 'test.example1',
                'route_name' => 'example1',
                'title' => 'foo',
                'parent' => '',
                'weight' => 0,
            ]),
            2 => MenuLinkMock::create([
                'id' => 'test.example2',
                'route_name' => 'example2',
                'title' => 'bar',
                'parent' => '',
                'route_parameters' => [
                    'foo' => 'bar',
                ],
                'weight' => 1,
            ]),
            3 => MenuLinkMock::create([
                'id' => 'test.example3',
                'route_name' => 'example3',
                'title' => 'baz',
                'parent' => 'test.example2',
                'weight' => 2,
            ]),
            4 => MenuLinkMock::create([
                'id' => 'test.example4',
                'route_name' => 'example4',
                'title' => 'qux',
                'parent' => 'test.example3',
                'weight' => 3,
            ]),
            5 => MenuLinkMock::create([
                'id' => 'test.example5',
                'route_name' => 'example5',
                'title' => 'title5',
                'parent' => '',
                'expanded' => TRUE,
                'weight' => 4,
            ]),
            6 => MenuLinkMock::create([
                'id' => 'test.example6',
                'route_name' => '',
                'url' => 'https://www.drupal.org/',
                'title' => 'barbar',
                'parent' => '',
                'weight' => 5,
            ]),
            7 => MenuLinkMock::create([
                'id' => 'test.example7',
                'route_name' => 'example7',
                'title' => 'title7',
                'parent' => 'test.example5',
                'weight' => 6,
            ]),
            8 => MenuLinkMock::create([
                'id' => 'test.example8',
                'route_name' => 'example8',
                'title' => 'title8',
                'parent' => '',
                'weight' => 7,
            ]),
        ];
        foreach ($links as $instance) {
            $this->menuLinkManager
                ->addDefinition($instance->getPluginId(), $instance->getPluginDefinition());
        }
    }
    
    /**
     * Tests calculation of a system menu block's configuration dependencies.
     */
    public function testSystemMenuBlockConfigDependencies() : void {
        $block = Block::create([
            'plugin' => 'system_menu_block:' . $this->menu
                ->id(),
            'region' => 'footer',
            'id' => 'machine_name',
            'theme' => 'stark',
        ]);
        $dependencies = $block->calculateDependencies()
            ->getDependencies();
        $expected = [
            'config' => [
                'system.menu.' . $this->menu
                    ->id(),
            ],
            'module' => [
                'system',
            ],
            'theme' => [
                'stark',
            ],
        ];
        $this->assertSame($expected, $dependencies);
    }
    
    /**
     * Tests the config start level and depth.
     */
    public function testConfigLevelDepth() : void {
        // Helper function to generate a configured block instance.
        $place_block = function ($level, $depth) {
            return $this->blockManager
                ->createInstance('system_menu_block:' . $this->menu
                ->id(), [
                'region' => 'footer',
                'id' => 'machine_name',
                'theme' => 'stark',
                'level' => $level,
                'depth' => $depth,
            ]);
        };
        // All the different block instances we're going to test.
        $blocks = [
            'all' => $place_block(1, 0),
            'level_1_only' => $place_block(1, 1),
            'level_2_only' => $place_block(2, 1),
            'level_3_only' => $place_block(3, 1),
            'level_1_and_beyond' => $place_block(1, 0),
            'level_2_and_beyond' => $place_block(2, 0),
            'level_3_and_beyond' => $place_block(3, 0),
        ];
        // Scenario 1: test all block instances when there's no active trail.
        $no_active_trail_expectations = [];
        $no_active_trail_expectations['all'] = [
            'test.example1' => [],
            'test.example2' => [],
            'test.example5' => [
                'test.example7' => [],
            ],
            'test.example6' => [],
            'test.example8' => [],
        ];
        $no_active_trail_expectations['level_1_only'] = [
            'test.example1' => [],
            'test.example2' => [],
            'test.example5' => [],
            'test.example6' => [],
            'test.example8' => [],
        ];
        $no_active_trail_expectations['level_2_only'] = [];
        $no_active_trail_expectations['level_3_only'] = [];
        $no_active_trail_expectations['level_1_and_beyond'] = $no_active_trail_expectations['all'];
        $no_active_trail_expectations['level_2_and_beyond'] = $no_active_trail_expectations['level_2_only'];
        $no_active_trail_expectations['level_3_and_beyond'] = [];
        foreach ($blocks as $id => $block) {
            $block_build = $block->build();
            $items = $block_build['#items'] ?? [];
            $this->assertSame($no_active_trail_expectations[$id], $this->convertBuiltMenuToIdTree($items), "Menu block {$id} with no active trail renders the expected tree.");
        }
        // Scenario 2: test all block instances when there's an active trail.
        $route = $this->container
            ->get('router.route_provider')
            ->getRouteByName('example3');
        $request = new Request();
        $request->attributes
            ->set(RouteObjectInterface::ROUTE_NAME, 'example3');
        $request->attributes
            ->set(RouteObjectInterface::ROUTE_OBJECT, $route);
        $request->setSession(new Session(new MockArraySessionStorage()));
        $this->container
            ->get('request_stack')
            ->push($request);
        // \Drupal\Core\Menu\MenuActiveTrail uses the cache collector pattern, which
        // includes static caching. Since this second scenario simulates a second
        // request, we must also simulate it for the MenuActiveTrail service, by
        // clearing the cache collector's static cache.
        \Drupal::service('menu.active_trail')->clear();
        $active_trail_expectations = [];
        $active_trail_expectations['all'] = [
            'test.example1' => [],
            'test.example2' => [
                'test.example3' => [
                    'test.example4' => [],
                ],
            ],
            'test.example5' => [
                'test.example7' => [],
            ],
            'test.example6' => [],
            'test.example8' => [],
        ];
        $active_trail_expectations['level_1_only'] = [
            'test.example1' => [],
            'test.example2' => [],
            'test.example5' => [],
            'test.example6' => [],
            'test.example8' => [],
        ];
        $active_trail_expectations['level_2_only'] = [
            'test.example3' => [],
        ];
        $active_trail_expectations['level_3_only'] = [
            'test.example4' => [],
        ];
        $active_trail_expectations['level_1_and_beyond'] = $active_trail_expectations['all'];
        $active_trail_expectations['level_2_and_beyond'] = [
            'test.example3' => [
                'test.example4' => [],
            ],
        ];
        $active_trail_expectations['level_3_and_beyond'] = $active_trail_expectations['level_3_only'];
        foreach ($blocks as $id => $block) {
            $block_build = $block->build();
            $items = $block_build['#items'] ?? [];
            $this->assertSame($active_trail_expectations[$id], $this->convertBuiltMenuToIdTree($items), "Menu block {$id} with an active trail renders the expected tree.");
        }
    }
    
    /**
     * Tests the config expanded option.
     *
     * @dataProvider configExpandedTestCases
     */
    public function testConfigExpanded($active_route, $menu_block_level, $expected_items) : void {
        $block = $this->blockManager
            ->createInstance('system_menu_block:' . $this->menu
            ->id(), [
            'region' => 'footer',
            'id' => 'machine_name',
            'theme' => 'stark',
            'level' => $menu_block_level,
            'depth' => 0,
            'expand_all_items' => TRUE,
        ]);
        $route = $this->container
            ->get('router.route_provider')
            ->getRouteByName($active_route);
        $request = new Request();
        $request->attributes
            ->set(RouteObjectInterface::ROUTE_NAME, $active_route);
        $request->attributes
            ->set(RouteObjectInterface::ROUTE_OBJECT, $route);
        $request->setSession(new Session(new MockArraySessionStorage()));
        $this->container
            ->get('request_stack')
            ->push($request);
        $block_build = $block->build();
        $items = $block_build['#items'] ?? [];
        $this->assertEquals($expected_items, $this->convertBuiltMenuToIdTree($items));
    }
    
    /**
     * @return array
     */
    public static function configExpandedTestCases() {
        return [
            'All levels' => [
                'example5',
                1,
                [
                    'test.example1' => [],
                    'test.example2' => [
                        'test.example3' => [
                            'test.example4' => [],
                        ],
                    ],
                    'test.example5' => [
                        'test.example7' => [],
                    ],
                    'test.example6' => [],
                    'test.example8' => [],
                ],
            ],
            'Level two in "example 5" branch' => [
                'example5',
                2,
                [
                    'test.example7' => [],
                ],
            ],
            'Level three in "example 5" branch' => [
                'example5',
                3,
                [],
            ],
            'Level three in "example 4" branch' => [
                'example4',
                3,
                [
                    'test.example4' => [],
                ],
            ],
        ];
    }
    
    /**
     * Helper method to allow for easy menu link tree structure assertions.
     *
     * Converts the result of MenuLinkTree::build() in a "menu link ID tree".
     *
     * @param array $build
     *   The return value of MenuLinkTree::build()
     *
     * @return array
     *   The "menu link ID tree" representation of the given render array.
     */
    protected function convertBuiltMenuToIdTree(array $build) {
        $level = [];
        foreach (Element::children($build) as $id) {
            $level[$id] = [];
            if (isset($build[$id]['below'])) {
                $level[$id] = $this->convertBuiltMenuToIdTree($build[$id]['below']);
            }
        }
        return $level;
    }

}