class SelectionTest

class SelectionTest extends KernelTestBase {
    use EntityReferenceFieldCreationTrait;
    use NodeCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'entity_reference_test',
        'entity_test',
        'field',
        'filter',
        'node',
        'system',
        'user',
        'views',
    ];
    
    /**
     * Nodes for testing.
     *
     * @var string[][]
     */
    protected $nodes = [];
    
    /**
     * The selection handler.
     *
     * @var \Drupal\Core\Entity\EntityReferenceSelection\SelectionInterface
     */
    protected $selectionHandler;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installConfig([
            'entity_reference_test',
            'filter',
        ]);
        $this->installEntitySchema('user');
        $this->installEntitySchema('node');
        // Create test nodes.
        $type = $this->randomMachineName();
        NodeType::create([
            'type' => $type,
            'name' => $this->randomString(),
        ])
            ->save();
        $node1 = $this->createNode([
            'type' => $type,
        ]);
        $node2 = $this->createNode([
            'type' => $type,
        ]);
        $node3 = $this->createNode();
        foreach ([
            $node1,
            $node2,
            $node3,
        ] as $node) {
            $this->nodes[$node->id()] = $node;
        }
        // Ensure the bundle to which the field is attached actually exists, or we
        // will get config validation errors.
        entity_test_create_bundle('test_bundle');
        // Create an entity reference field.
        $handler_settings = [
            'view' => [
                'view_name' => 'test_entity_reference',
                'display_name' => 'entity_reference_1',
            ],
        ];
        $this->createEntityReferenceField('entity_test', 'test_bundle', 'test_field', $this->randomString(), 'node', 'views', $handler_settings);
        $field_config = FieldConfig::loadByName('entity_test', 'test_bundle', 'test_field');
        $this->selectionHandler = $this->container
            ->get('plugin.manager.entity_reference_selection')
            ->getSelectionHandler($field_config);
    }
    
    /**
     * Tests the selection handler.
     */
    public function testSelectionHandler() : void {
        // Tests the selection handler.
        $this->assertResults($this->selectionHandler
            ->getReferenceableEntities());
        // Add a relationship to the view.
        $view = Views::getView('test_entity_reference');
        $view->setDisplay();
        $view->displayHandlers
            ->get('default')
            ->setOption('relationships', [
            'test_relationship' => [
                'id' => 'uid',
                'table' => 'node_field_data',
                'field' => 'uid',
            ],
        ]);
        // Add a filter depending on the relationship to the test view.
        $view->displayHandlers
            ->get('default')
            ->setOption('filters', [
            'uid' => [
                'id' => 'uid',
                'table' => 'users_field_data',
                'field' => 'uid',
                'relationship' => 'test_relationship',
            ],
        ]);
        // Set view to distinct so only one row per node is returned.
        $query_options = $view->display_handler
            ->getOption('query');
        $query_options['options']['distinct'] = TRUE;
        $view->display_handler
            ->setOption('query', $query_options);
        $view->save();
        // Tests the selection handler with a relationship.
        $this->assertResults($this->selectionHandler
            ->getReferenceableEntities());
    }
    
    /**
     * Tests the anchor tag stripping.
     *
     * Unstripped results based on the data above will result in output like so:
     *   ...<a href="/node/1" hreflang="en">Test first node</a>...
     *   ...<a href="/node/2" hreflang="en">Test second node</a>...
     *   ...<a href="/node/3" hreflang="en">Test third node</a>...
     * If we expect our output to not have the <a> tags, and this matches what's
     * produced by the tag-stripping method, we'll know that it's working.
     */
    public function testAnchorTagStripping() : void {
        $filtered_rendered_results_formatted = [];
        foreach ($this->selectionHandler
            ->getReferenceableEntities() as $subresults) {
            $filtered_rendered_results_formatted += array_map(fn(MarkupInterface $markup): string => (string) $markup, $subresults);
        }
        // Note the missing <a> tags.
        $expected = [
            1 => '<span class="views-field views-field-title"><span class="field-content">' . Html::escape($this->nodes[1]
                ->label()) . '</span></span>',
            2 => '<span class="views-field views-field-title"><span class="field-content">' . Html::escape($this->nodes[2]
                ->label()) . '</span></span>',
            3 => '<span class="views-field views-field-title"><span class="field-content">' . Html::escape($this->nodes[3]
                ->label()) . '</span></span>',
        ];
        $this->assertSame($expected, $filtered_rendered_results_formatted, 'Anchor tag stripping has failed.');
    }
    
    /**
     * Confirm the expected results are returned.
     *
     * @param array $result
     *   Query results keyed by node type and nid.
     *
     * @internal
     */
    protected function assertResults(array $result) : void {
        foreach ($result as $node_type => $values) {
            foreach ($values as $nid => $label) {
                $this->assertSame($node_type, $this->nodes[$nid]
                    ->bundle());
                $this->assertSame(trim(strip_tags((string) $label)), Html::escape($this->nodes[$nid]
                    ->label()));
            }
        }
    }

}