class FieldDefinitionIntegrityTest

class FieldDefinitionIntegrityTest extends KernelTestBase {
    
    /**
     * @var array
     */
    protected static $modules = [
        'system',
        'path_alias',
    ];
    
    /**
     * Tests the integrity of field plugin definitions.
     */
    public function testFieldPluginDefinitionIntegrity() : void {
        // Enable all core modules that provide field plugins, and their
        // dependencies.
        $this->enableModules($this->modulesWithSubdirectory('src' . DIRECTORY_SEPARATOR . 'Plugin' . DIRECTORY_SEPARATOR . 'Field'));
        
        /** @var \Drupal\Component\Plugin\Discovery\DiscoveryInterface $field_type_manager */
        $field_type_manager = \Drupal::service('plugin.manager.field.field_type');
        
        /** @var \Drupal\Component\Plugin\Discovery\DiscoveryInterface $field_type_manager */
        $field_formatter_manager = \Drupal::service('plugin.manager.field.formatter');
        
        /** @var \Drupal\Component\Plugin\Discovery\DiscoveryInterface $field_type_manager */
        $field_widget_manager = \Drupal::service('plugin.manager.field.widget');
        // Load the IDs of all available field type plugins.
        $available_field_type_ids = [];
        foreach ($field_type_manager->getDefinitions() as $definition) {
            $available_field_type_ids[] = $definition['id'];
        }
        // Load the IDs of all available field widget plugins.
        $available_field_widget_ids = [];
        foreach ($field_widget_manager->getDefinitions() as $definition) {
            $available_field_widget_ids[] = $definition['id'];
        }
        // Load the IDs of all available field formatter plugins.
        $available_field_formatter_ids = [];
        foreach ($field_formatter_manager->getDefinitions() as $definition) {
            $available_field_formatter_ids[] = $definition['id'];
        }
        // Test the field type plugins.
        foreach ($field_type_manager->getDefinitions() as $definition) {
            // Test default field widgets.
            if (isset($definition['default_widget'])) {
                $this->assertContains($definition['default_widget'], $available_field_widget_ids, sprintf('Field type %s uses a non-existent field widget by default: %s', $definition['id'], $definition['default_widget']));
            }
            // Test default field formatters.
            if (isset($definition['default_formatter'])) {
                $this->assertContains($definition['default_formatter'], $available_field_formatter_ids, sprintf('Field type %s uses a non-existent field formatter by default: %s', $definition['id'], $definition['default_formatter']));
            }
        }
        // Test the field widget plugins.
        foreach ($field_widget_manager->getDefinitions() as $definition) {
            $missing_field_type_ids = array_diff($definition['field_types'], $available_field_type_ids);
            $this->assertEmpty($missing_field_type_ids, sprintf('Field widget %s integrates with non-existent field types: %s', $definition['id'], implode(', ', $missing_field_type_ids)));
        }
        // Test the field formatter plugins.
        foreach ($field_formatter_manager->getDefinitions() as $definition) {
            $missing_field_type_ids = array_diff($definition['field_types'], $available_field_type_ids);
            $this->assertEmpty($missing_field_type_ids, sprintf('Field formatter %s integrates with non-existent field types: %s', $definition['id'], implode(', ', $missing_field_type_ids)));
        }
    }
    
    /**
     * Tests to load field plugin definitions used in core's existing entities.
     */
    public function testFieldPluginDefinitionAvailability() : void {
        $this->enableModules($this->modulesWithSubdirectory('src' . DIRECTORY_SEPARATOR . 'Entity'));
        
        /** @var \Drupal\Component\Plugin\Discovery\DiscoveryInterface $field_type_manager */
        $field_formatter_manager = $this->container
            ->get('plugin.manager.field.formatter');
        
        /** @var \Drupal\Component\Plugin\Discovery\DiscoveryInterface $field_type_manager */
        $field_widget_manager = $this->container
            ->get('plugin.manager.field.widget');
        
        /** @var \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager */
        $entity_field_manager = $this->container
            ->get('entity_field.manager');
        
        /** @var \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager */
        $entity_type_manager = $this->container
            ->get('entity_type.manager');
        
        /** @var \Drupal\Core\Field\BaseFieldDefinition[][] $field_definitions */
        $field_definitions = [];
        
        /** @var \Drupal\Core\Entity\EntityTypeInterface[] $content_entity_types */
        $content_entity_types = array_filter($entity_type_manager->getDefinitions(), function (EntityTypeInterface $entity_type) {
            return $entity_type instanceof ContentEntityTypeInterface;
        });
        foreach ($content_entity_types as $entity_type_id => $entity_type_definition) {
            $field_definitions[$entity_type_id] = $entity_field_manager->getBaseFieldDefinitions($entity_type_id);
        }
        foreach ($field_definitions as $entity_type_id => $definitions) {
            foreach ($definitions as $field_id => $field_definition) {
                $this->checkDisplayOption($entity_type_id, $field_id, $field_definition, $field_formatter_manager, 'view');
                $this->checkDisplayOption($entity_type_id, $field_id, $field_definition, $field_widget_manager, 'form');
            }
        }
    }
    
    /**
     * Helper method that tries to load plugin definitions.
     *
     * @param string $entity_type_id
     *   Id of entity type. Required by message.
     * @param string $field_id
     *   Id of field. Required by message.
     * @param \Drupal\Core\Field\BaseFieldDefinition $field_definition
     *   Field definition that provide display options.
     * @param \Drupal\Component\Plugin\Discovery\DiscoveryInterface $plugin_manager
     *   Plugin manager that will try to provide plugin definition.
     * @param string $display_context
     *   Defines which display options should be loaded.
     */
    protected function checkDisplayOption($entity_type_id, $field_id, BaseFieldDefinition $field_definition, DiscoveryInterface $plugin_manager, $display_context) {
        $display_options = $field_definition->getDisplayOptions($display_context);
        if (!empty($display_options['type'])) {
            $plugin = $plugin_manager->getDefinition($display_options['type'], FALSE);
            $this->assertNotNull($plugin, sprintf('Plugin found for "%s" field %s display options of "%s" entity type.', $field_id, $display_context, $entity_type_id));
        }
    }
    
    /**
     * Find modules with a specified subdirectory.
     *
     * @param string $subdirectory
     *   The required path, relative to the module directory.
     *
     * @return string[]
     *   A list of module names satisfying these criteria:
     *   - provided by core
     *   - not hidden
     *   - not already enabled
     *   - not in the Testing package
     *   - containing the required $subdirectory
     *   and all modules required by any of these modules.
     */
    protected function modulesWithSubdirectory($subdirectory) {
        $modules = \Drupal::service('extension.list.module')->getList();
        $modules = array_filter($modules, function (Extension $module) use ($subdirectory) {
            // Filter contrib, hidden, already enabled modules and modules in the
            // Testing package.
            return $module->origin === 'core' && empty($module->info['hidden']) && $module->status == FALSE && $module->info['package'] !== 'Testing' && is_readable($module->getPath() . DIRECTORY_SEPARATOR . $subdirectory);
        });
        // Gather the dependencies of the modules.
        $dependencies = NestedArray::mergeDeepArray(array_map(function (Extension $module) {
            return array_keys($module->requires);
        }, $modules));
        return array_unique(NestedArray::mergeDeep(array_keys($modules), $dependencies));
    }

}