class DisplayApiTest

class DisplayApiTest extends FieldKernelTestBase {
    
    /**
     * The field name to use in this test.
     *
     * @var string
     */
    protected $fieldName;
    
    /**
     * The field label to use in this test.
     *
     * @var string
     */
    protected $label;
    
    /**
     * The field cardinality to use in this test.
     *
     * @var int
     */
    protected $cardinality;
    
    /**
     * The field display options to use in this test.
     *
     * @var array
     */
    protected $displayOptions;
    
    /**
     * The test entity.
     *
     * @var \Drupal\Core\Entity\EntityInterface
     */
    protected $entity;
    
    /**
     * An array of random values, in the format expected for field values.
     *
     * @var array
     */
    protected $values;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Create a field and its storage.
        $this->fieldName = 'test_field';
        $this->label = $this->randomMachineName();
        $this->cardinality = 4;
        $field_storage = [
            'field_name' => $this->fieldName,
            'entity_type' => 'entity_test',
            'type' => 'test_field',
            'cardinality' => $this->cardinality,
        ];
        $field = [
            'field_name' => $this->fieldName,
            'entity_type' => 'entity_test',
            'bundle' => 'entity_test',
            'label' => $this->label,
        ];
        $this->displayOptions = [
            'default' => [
                'type' => 'field_test_default',
                'settings' => [
                    'test_formatter_setting' => $this->randomMachineName(),
                ],
            ],
            'teaser' => [
                'type' => 'field_test_default',
                'settings' => [
                    'test_formatter_setting' => $this->randomMachineName(),
                ],
            ],
        ];
        
        /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
        $display_repository = \Drupal::service('entity_display.repository');
        FieldStorageConfig::create($field_storage)->save();
        FieldConfig::create($field)->save();
        // Create a display for the default view mode.
        $display_repository->getViewDisplay($field['entity_type'], $field['bundle'])
            ->setComponent($this->fieldName, $this->displayOptions['default'])
            ->save();
        // Create a display for the teaser view mode.
        EntityViewMode::create([
            'id' => 'entity_test.teaser',
            'label' => 'Teaser',
            'targetEntityType' => 'entity_test',
        ])->save();
        $display_repository->getViewDisplay($field['entity_type'], $field['bundle'], 'teaser')
            ->setComponent($this->fieldName, $this->displayOptions['teaser'])
            ->save();
        // Create an entity with values.
        $this->values = $this->_generateTestFieldValues($this->cardinality);
        $this->entity = EntityTest::create();
        $this->entity->{$this->fieldName}
            ->setValue($this->values);
        $this->entity
            ->save();
    }
    
    /**
     * Tests the FieldItemListInterface::view() method.
     */
    public function testFieldItemListView() : void {
        $items = $this->entity
            ->get($this->fieldName);
        \Drupal::service('theme_installer')->install([
            'stark',
        ]);
        $this->config('system.theme')
            ->set('default', 'stark')
            ->save();
        // No display settings: check that default display settings are used.
        $build = $items->view();
        $this->render($build);
        $settings = \Drupal::service('plugin.manager.field.formatter')->getDefaultSettings('field_test_default');
        $setting = $settings['test_formatter_setting'];
        $this->assertText($this->label, 'Label was displayed.');
        foreach ($this->values as $delta => $value) {
            $this->assertText($setting . '|' . $value['value'], new FormattableMarkup('Value @delta was displayed with expected setting.', [
                '@delta' => $delta,
            ]));
        }
        // Display settings: Check hidden field.
        $display = [
            'label' => 'hidden',
            'type' => 'field_test_multiple',
            'settings' => [
                'test_formatter_setting_multiple' => $this->randomMachineName(),
                'alter' => TRUE,
            ],
        ];
        $build = $items->view($display);
        $this->render($build);
        $setting = $display['settings']['test_formatter_setting_multiple'];
        $this->assertNoText($this->label, 'Label was not displayed.');
        $this->assertText('field_test_entity_display_build_alter', 'Alter fired, display passed.');
        $this->assertText('entity language is en', 'Language is placed onto the context.');
        $array = [];
        foreach ($this->values as $delta => $value) {
            $array[] = $delta . ':' . $value['value'];
        }
        $this->assertText($setting . '|' . implode('|', $array), 'Values were displayed with expected setting.');
        // Display settings: Check visually_hidden field.
        $display = [
            'label' => 'visually_hidden',
            'type' => 'field_test_multiple',
            'settings' => [
                'test_formatter_setting_multiple' => $this->randomMachineName(),
                'alter' => TRUE,
            ],
        ];
        $build = $items->view($display);
        $this->render($build);
        $setting = $display['settings']['test_formatter_setting_multiple'];
        $this->assertRaw('visually-hidden', 'Label was visually hidden.');
        $this->assertText('field_test_entity_display_build_alter', 'Alter fired, display passed.');
        $this->assertText('entity language is en', 'Language is placed onto the context.');
        $array = [];
        foreach ($this->values as $delta => $value) {
            $array[] = $delta . ':' . $value['value'];
        }
        $this->assertText($setting . '|' . implode('|', $array), 'Values were displayed with expected setting.');
        // Check the prepare_view steps are invoked.
        $display = [
            'label' => 'hidden',
            'type' => 'field_test_with_prepare_view',
            'settings' => [
                'test_formatter_setting_additional' => $this->randomMachineName(),
            ],
        ];
        $build = $items->view($display);
        $this->render($build);
        $setting = $display['settings']['test_formatter_setting_additional'];
        $this->assertNoText($this->label, 'Label was not displayed.');
        $this->assertNoText('field_test_entity_display_build_alter', 'Alter not fired.');
        foreach ($this->values as $delta => $value) {
            $this->assertText($setting . '|' . $value['value'] . '|' . ($value['value'] + 1), new FormattableMarkup('Value @delta was displayed with expected setting.', [
                '@delta' => $delta,
            ]));
        }
        // View mode: check that display settings specified in the display object
        // are used.
        $build = $items->view('teaser');
        $this->render($build);
        $setting = $this->displayOptions['teaser']['settings']['test_formatter_setting'];
        $this->assertText($this->label, 'Label was displayed.');
        foreach ($this->values as $delta => $value) {
            $this->assertText($setting . '|' . $value['value'], new FormattableMarkup('Value @delta was displayed with expected setting.', [
                '@delta' => $delta,
            ]));
        }
        // Unknown view mode: check that display settings for 'default' view mode
        // are used.
        $build = $items->view('unknown_view_mode');
        $this->render($build);
        $setting = $this->displayOptions['default']['settings']['test_formatter_setting'];
        $this->assertText($this->label, 'Label was displayed.');
        foreach ($this->values as $delta => $value) {
            $this->assertText($setting . '|' . $value['value'], new FormattableMarkup('Value @delta was displayed with expected setting.', [
                '@delta' => $delta,
            ]));
        }
    }
    
    /**
     * Tests the FieldItemInterface::view() method.
     */
    public function testFieldItemView() : void {
        // No display settings: check that default display settings are used.
        $settings = \Drupal::service('plugin.manager.field.formatter')->getDefaultSettings('field_test_default');
        $setting = $settings['test_formatter_setting'];
        foreach ($this->values as $delta => $value) {
            $item = $this->entity->{$this->fieldName}[$delta];
            $build = $item->view();
            $this->render($build);
            $this->assertText($setting . '|' . $value['value'], new FormattableMarkup('Value @delta was displayed with expected setting.', [
                '@delta' => $delta,
            ]));
        }
        // Check that explicit display settings are used.
        $display = [
            'type' => 'field_test_multiple',
            'settings' => [
                'test_formatter_setting_multiple' => $this->randomMachineName(),
            ],
        ];
        $setting = $display['settings']['test_formatter_setting_multiple'];
        foreach ($this->values as $delta => $value) {
            $item = $this->entity->{$this->fieldName}[$delta];
            $build = $item->view($display);
            $this->render($build);
            $this->assertText($setting . '|0:' . $value['value'], new FormattableMarkup('Value @delta was displayed with expected setting.', [
                '@delta' => $delta,
            ]));
        }
        // Check that prepare_view steps are invoked.
        $display = [
            'type' => 'field_test_with_prepare_view',
            'settings' => [
                'test_formatter_setting_additional' => $this->randomMachineName(),
            ],
        ];
        $setting = $display['settings']['test_formatter_setting_additional'];
        foreach ($this->values as $delta => $value) {
            $item = $this->entity->{$this->fieldName}[$delta];
            $build = $item->view($display);
            $this->render($build);
            $this->assertText($setting . '|' . $value['value'] . '|' . ($value['value'] + 1), new FormattableMarkup('Value @delta was displayed with expected setting.', [
                '@delta' => $delta,
            ]));
        }
        // View mode: check that display settings specified in the field are used.
        $setting = $this->displayOptions['teaser']['settings']['test_formatter_setting'];
        foreach ($this->values as $delta => $value) {
            $item = $this->entity->{$this->fieldName}[$delta];
            $build = $item->view('teaser');
            $this->render($build);
            $this->assertText($setting . '|' . $value['value'], new FormattableMarkup('Value @delta was displayed with expected setting.', [
                '@delta' => $delta,
            ]));
        }
        // Unknown view mode: check that display settings for 'default' view mode
        // are used.
        $setting = $this->displayOptions['default']['settings']['test_formatter_setting'];
        foreach ($this->values as $delta => $value) {
            $item = $this->entity->{$this->fieldName}[$delta];
            $build = $item->view('unknown_view_mode');
            $this->render($build);
            $this->assertText($setting . '|' . $value['value'], new FormattableMarkup('Value @delta was displayed with expected setting.', [
                '@delta' => $delta,
            ]));
        }
    }
    
    /**
     * Tests that the prepareView() formatter method still fires for empty values.
     */
    public function testFieldEmpty() : void {
        // Uses \Drupal\field_test\Plugin\Field\FieldFormatter\TestFieldEmptyFormatter.
        $display = [
            'label' => 'hidden',
            'type' => 'field_empty_test',
            'settings' => [
                'test_empty_string' => '**EMPTY FIELD**' . $this->randomMachineName(),
            ],
        ];
        // $this->entity is set by the setUp() method and by default contains 4
        // numeric values.  We only want to test the display of this one field.
        $build = $this->entity
            ->get($this->fieldName)
            ->view($display);
        $this->render($build);
        // The test field by default contains values, so should not display the
        // default "empty" text.
        $this->assertNoText($display['settings']['test_empty_string']);
        // Now remove the values from the test field and retest.
        $this->entity->{$this->fieldName} = [];
        $this->entity
            ->save();
        $build = $this->entity
            ->get($this->fieldName)
            ->view($display);
        $this->render($build);
        // This time, as the field values have been removed, we *should* show the
        // default "empty" text.
        $this->assertText($display['settings']['test_empty_string']);
    }

}