class EntityReferenceIntegrationTest

class EntityReferenceIntegrationTest extends BrowserTestBase {
    use AssertConfigEntityImportTrait;
    use EntityReferenceFieldCreationTrait;
    
    /**
     * The entity type used in this test.
     *
     * @var string
     */
    protected $entityType = 'entity_test';
    
    /**
     * The bundle used in this test.
     *
     * @var string
     */
    protected $bundle = 'entity_test';
    
    /**
     * The name of the field used in this test.
     *
     * @var string
     */
    protected $fieldName;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'config_test',
        'entity_test',
        'field_ui',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Create a test user.
        $web_user = $this->drupalCreateUser([
            'administer entity_test content',
            'administer entity_test fields',
            'view test entity',
        ]);
        $this->drupalLogin($web_user);
    }
    
    /**
     * Tests the entity reference field with all its supported field widgets.
     */
    public function testSupportedEntityTypesAndWidgets() : void {
        foreach ($this->getTestEntities() as $key => $referenced_entities) {
            $this->fieldName = 'field_test_' . $referenced_entities[0]->getEntityTypeId();
            // Create an Entity reference field.
            $this->createEntityReferenceField($this->entityType, $this->bundle, $this->fieldName, $this->fieldName, $referenced_entities[0]->getEntityTypeId(), 'default', [], 2);
            
            /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
            $display_repository = \Drupal::service('entity_display.repository');
            // Test the default 'entity_reference_autocomplete' widget.
            $display_repository->getFormDisplay($this->entityType, $this->bundle)
                ->setComponent($this->fieldName)
                ->save();
            $entity_name = $this->randomMachineName();
            $edit = [
                'name[0][value]' => $entity_name,
                $this->fieldName . '[0][target_id]' => $referenced_entities[0]->label() . ' (' . $referenced_entities[0]->id() . ')',
                // Test an input of the entity label without an ' (entity_id)' suffix.
$this->fieldName . '[1][target_id]' => $referenced_entities[1]->label(),
            ];
            $this->drupalGet($this->entityType . '/add');
            $this->submitForm($edit, 'Save');
            $this->assertFieldValues($entity_name, $referenced_entities);
            // Try to post the form again with no modification and check if the field
            // values remain the same.
            
            /** @var \Drupal\Core\Entity\EntityStorageInterface $storage */
            $storage = $this->container
                ->get('entity_type.manager')
                ->getStorage($this->entityType);
            $entity = current($storage->loadByProperties([
                'name' => $entity_name,
            ]));
            $this->drupalGet($this->entityType . '/manage/' . $entity->id() . '/edit');
            $this->assertSession()
                ->fieldValueEquals($this->fieldName . '[0][target_id]', $referenced_entities[0]->label() . ' (' . $referenced_entities[0]->id() . ')');
            $this->assertSession()
                ->fieldValueEquals($this->fieldName . '[1][target_id]', $referenced_entities[1]->label() . ' (' . $referenced_entities[1]->id() . ')');
            $this->submitForm([], 'Save');
            $this->assertFieldValues($entity_name, $referenced_entities);
            // Test the 'entity_reference_autocomplete_tags' widget.
            $display_repository->getFormDisplay($this->entityType, $this->bundle)
                ->setComponent($this->fieldName, [
                'type' => 'entity_reference_autocomplete_tags',
            ])
                ->save();
            $entity_name = $this->randomMachineName();
            $target_id = $referenced_entities[0]->label() . ' (' . $referenced_entities[0]->id() . ')';
            // Test an input of the entity label without an ' (entity_id)' suffix.
            $target_id .= ', ' . $referenced_entities[1]->label();
            $edit = [
                'name[0][value]' => $entity_name,
                $this->fieldName . '[target_id]' => $target_id,
            ];
            $this->drupalGet($this->entityType . '/add');
            $this->submitForm($edit, 'Save');
            $this->assertFieldValues($entity_name, $referenced_entities);
            // Try to post the form again with no modification and check if the field
            // values remain the same.
            $entity = current($storage->loadByProperties([
                'name' => $entity_name,
            ]));
            $this->drupalGet($this->entityType . '/manage/' . $entity->id() . '/edit');
            $this->assertSession()
                ->fieldValueEquals($this->fieldName . '[target_id]', $target_id . ' (' . $referenced_entities[1]->id() . ')');
            $this->submitForm([], 'Save');
            $this->assertFieldValues($entity_name, $referenced_entities);
            // Test all the other widgets supported by the entity reference field.
            // Since we don't know the form structure for these widgets, just test
            // that editing and saving an already created entity works.
            $exclude = [
                'entity_reference_autocomplete',
                'entity_reference_autocomplete_tags',
            ];
            $entity = current($storage->loadByProperties([
                'name' => $entity_name,
            ]));
            $supported_widgets = \Drupal::service('plugin.manager.field.widget')->getOptions('entity_reference');
            $supported_widget_types = array_diff(array_keys($supported_widgets), $exclude);
            foreach ($supported_widget_types as $widget_type) {
                $display_repository->getFormDisplay($this->entityType, $this->bundle)
                    ->setComponent($this->fieldName, [
                    'type' => $widget_type,
                ])
                    ->save();
                $this->drupalGet($this->entityType . '/manage/' . $entity->id() . '/edit');
                $this->submitForm([], 'Save');
                $this->assertFieldValues($entity_name, $referenced_entities);
            }
            // Reset to the default 'entity_reference_autocomplete' widget.
            $display_repository->getFormDisplay($this->entityType, $this->bundle)
                ->setComponent($this->fieldName)
                ->save();
            // Set first entity as the default_value.
            $field_edit = [
                'set_default_value' => '1',
                'default_value_input[' . $this->fieldName . '][0][target_id]' => $referenced_entities[0]->label() . ' (' . $referenced_entities[0]->id() . ')',
            ];
            if ($key == 'content') {
                $field_edit['settings[handler_settings][target_bundles][' . $referenced_entities[0]->getEntityTypeId() . ']'] = TRUE;
            }
            $this->drupalGet($this->entityType . '/structure/' . $this->bundle . '/fields/' . $this->entityType . '.' . $this->bundle . '.' . $this->fieldName);
            $this->submitForm($field_edit, 'Save settings');
            // Ensure the configuration has the expected dependency on the entity that
            // is being used a default value.
            $field = FieldConfig::loadByName($this->entityType, $this->bundle, $this->fieldName);
            $this->assertContains($referenced_entities[0]->getConfigDependencyName(), $field->getDependencies()[$key], 'Expected ' . $key . ' dependency ' . $referenced_entities[0]->getConfigDependencyName() . ' found');
            // Ensure that the field can be imported without change even after the
            // default value deleted.
            $referenced_entities[0]->delete();
            // Reload the field since deleting the default value can change the field.
            \Drupal::entityTypeManager()->getStorage($field->getEntityTypeId())
                ->resetCache([
                $field->id(),
            ]);
            $field = FieldConfig::loadByName($this->entityType, $this->bundle, $this->fieldName);
            $this->assertConfigEntityImport($field);
            // Once the default value has been removed after saving the dependency
            // should be removed.
            $field = FieldConfig::loadByName($this->entityType, $this->bundle, $this->fieldName);
            $field->save();
            $dependencies = $field->getDependencies();
            $this->assertFalse(isset($dependencies[$key]) && in_array($referenced_entities[0]->getConfigDependencyName(), $dependencies[$key]), $key . ' dependency ' . $referenced_entities[0]->getConfigDependencyName() . ' does not exist.');
        }
    }
    
    /**
     * Asserts that the reference field values are correct.
     *
     * @param string $entity_name
     *   The name of the test entity.
     * @param \Drupal\Core\Entity\EntityInterface[] $referenced_entities
     *   An array of referenced entities.
     *
     * @internal
     */
    protected function assertFieldValues(string $entity_name, array $referenced_entities) : void {
        $entity = current($this->container
            ->get('entity_type.manager')
            ->getStorage($this->entityType)
            ->loadByProperties([
            'name' => $entity_name,
        ]));
        $this->assertNotEmpty($entity, "{$this->entityType}: Entity found in the database.");
        $this->assertEquals($referenced_entities[0]->id(), $entity->{$this->fieldName}->target_id);
        $this->assertEquals($referenced_entities[0]->id(), $entity->{$this->fieldName}->entity
            ->id());
        $this->assertEquals($referenced_entities[0]->label(), $entity->{$this->fieldName}->entity
            ->label());
        $this->assertEquals($referenced_entities[1]->id(), $entity->{$this->fieldName}[1]->target_id);
        $this->assertEquals($referenced_entities[1]->id(), $entity->{$this->fieldName}[1]->entity
            ->id());
        $this->assertEquals($referenced_entities[1]->label(), $entity->{$this->fieldName}[1]->entity
            ->label());
    }
    
    /**
     * Creates two content and two config test entities.
     *
     * @return array
     *   An array of entity objects.
     */
    protected function getTestEntities() {
        $storage = \Drupal::entityTypeManager()->getStorage('config_test');
        $config_entity_1 = $storage->create([
            'id' => $this->randomMachineName(),
            'label' => $this->randomMachineName(),
        ]);
        $config_entity_1->save();
        $config_entity_2 = $storage->create([
            'id' => $this->randomMachineName(),
            'label' => $this->randomMachineName(),
        ]);
        $config_entity_2->save();
        $content_entity_1 = EntityTest::create([
            'name' => $this->randomMachineName(),
        ]);
        $content_entity_1->save();
        $content_entity_2 = EntityTest::create([
            'name' => $this->randomMachineName(),
        ]);
        $content_entity_2->save();
        return [
            'config' => [
                $config_entity_1,
                $config_entity_2,
            ],
            'content' => [
                $content_entity_1,
                $content_entity_2,
            ],
        ];
    }

}