class MultipleValueWidgetTest

class MultipleValueWidgetTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'field_test',
        'entity_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $account = $this->drupalCreateUser([
            'view test entity',
            'administer entity_test content',
        ]);
        $this->drupalLogin($account);
        $field = [
            'field_name' => 'field_unlimited',
            'entity_type' => 'entity_test',
            'bundle' => 'entity_test',
            'label' => $this->randomMachineName() . '_label',
            'description' => '[site:name]_description',
            'weight' => mt_rand(0, 127),
            'settings' => [
                'test_field_setting' => $this->randomMachineName(),
            ],
        ];
        FieldStorageConfig::create([
            'field_name' => 'field_unlimited',
            'entity_type' => 'entity_test',
            'type' => 'test_field',
            'cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
        ])->save();
        FieldConfig::create($field)->save();
        $entity_form_display = EntityFormDisplay::load($field['entity_type'] . '.' . $field['bundle'] . '.default');
        $entity_form_display->setComponent($field['field_name'])
            ->save();
    }
    
    /**
     * Tests the 'Add more' functionality.
     */
    public function testFieldMultipleValueWidget() : void {
        $this->drupalGet('entity_test/add');
        $assert_session = $this->assertSession();
        $page = $this->getSession()
            ->getPage();
        $add_more_button = $page->findButton('field_unlimited_add_more');
        // First set a value on the first input field.
        $field_0 = $page->findField('field_unlimited[0][value]');
        $field_0->setValue('1');
        $field_0_remove_button = $page->findButton('field_unlimited_0_remove_button');
        $this->assertNotEmpty($field_0_remove_button, 'First field has a remove button.');
        // Add another item.
        $add_more_button->click();
        $field_1 = $assert_session->waitForField('field_unlimited[1][value]');
        $this->assertNotEmpty($field_1, 'Successfully added another item.');
        $field_1_remove_button = $page->findButton('field_unlimited_1_remove_button');
        $this->assertNotEmpty($field_1_remove_button, 'Also second field has a remove button.');
        // Validate the value of the first field has not changed.
        $this->assertEquals('1', $field_0->getValue(), 'Value for the first item has not changed.');
        // Validate the value of the second item is empty.
        $this->assertEmpty($field_1->getValue(), 'Value for the second item is currently empty.');
        // Add another item.
        $add_more_button->click();
        $field_2 = $assert_session->waitForField('field_unlimited[2][value]');
        $this->assertNotEmpty($field_2, 'Successfully added another item.');
        // Set values for the 2nd and 3rd fields to validate dragging.
        $field_1->setValue('2');
        $field_2->setValue('3');
        $field_weight_0 = $page->findField('field_unlimited[0][_weight]');
        $field_weight_1 = $page->findField('field_unlimited[1][_weight]');
        $field_weight_2 = $page->findField('field_unlimited[2][_weight]');
        // Assert starting situation matches expectations.
        $this->assertGreaterThan($field_weight_0->getValue(), $field_weight_1->getValue());
        $this->assertGreaterThan($field_weight_1->getValue(), $field_weight_2->getValue());
        // Drag the first row after the third row.
        $dragged = $field_0->find('xpath', 'ancestor::tr[contains(@class, "draggable")]//a[starts-with(@class, "tabledrag-handle")]');
        $target = $field_2->find('xpath', 'ancestor::tr[contains(@class, "draggable")]');
        $dragged->dragTo($target);
        // Assert the order of items is updated correctly after dragging.
        $this->assertGreaterThan($field_weight_2->getValue(), $field_weight_0->getValue());
        $this->assertGreaterThan($field_weight_1->getValue(), $field_weight_2->getValue());
        // Validate the order of items conforms to the last drag action after a
        // updating the form via the server.
        $add_more_button->click();
        $field_3 = $assert_session->waitForField('field_unlimited[3][value]');
        $this->assertNotEmpty($field_3);
        $this->assertGreaterThan($field_weight_2->getValue(), $field_weight_0->getValue());
        $this->assertGreaterThan($field_weight_1->getValue(), $field_weight_2->getValue());
        // Validate no extraneous widget is displayed.
        $element = $page->findField('field_unlimited[4][value]');
        $this->assertEmpty($element);
        // Test removing items/values.
        $field_0_remove_button->click();
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        // Test the updated widget.
        // First item is the initial second item.
        $this->assertEquals('2', $field_0->getValue(), 'Value for the first item has changed.');
        // We do not have the initial first item anymore.
        $this->assertEmpty($field_2->getValue(), 'Value for the third item is currently empty.');
        $element = $page->findField('field_unlimited[3][value]');
        $this->assertEmpty($element);
        // We can also remove empty items.
        $field_2_remove_button = $page->findButton('field_unlimited_2_remove_button');
        $field_2_remove_button->click();
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $element = $page->findField('field_unlimited[2][value]');
        $this->assertEmpty($element, 'Empty field also removed.');
        // Assert that the wrapper exists and isn't nested.
        $this->assertSession()
            ->elementsCount('css', '[data-drupal-selector="edit-field-unlimited-wrapper"]', 1);
        // Test removing items/values on saved entities resets to initial value.
        $this->submitForm([], 'Save');
        $field_2_remove_button->click();
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $field_1_remove_button->click();
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $field_0_remove_button->click();
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $add_more_button->click();
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $this->assertSame('', $field_0->getValue());
        $add_more_button->click();
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $this->assertSame('', $field_1->getValue());
    }
    
    /**
     * Tests that no validation occurs on field on "Add more" click.
     */
    public function testFieldMultipleValueWidgetAddMoreNoValidation() : void {
        // Set unlimited field to be required.
        $field_name = 'field_unlimited';
        $field = FieldConfig::loadByName('entity_test', 'entity_test', $field_name);
        $field->setRequired(TRUE);
        $field->save();
        $this->drupalGet('entity_test/add');
        $assert_session = $this->assertSession();
        $page = $this->getSession()
            ->getPage();
        // Add another item with the first item being empty, even though the field
        // is required.
        $add_more_button = $page->findButton('field_unlimited_add_more');
        $add_more_button->click();
        $field_1 = $assert_session->waitForField('field_unlimited[1][value]');
        $this->assertNotEmpty($field_1, 'Successfully added another item.');
        // Confirm the new item has focus.
        $this->assertHasFocusByAttribute('name', 'field_unlimited[1][value]');
        // The first item should not be in error state.
        $assert_session->elementNotExists('css', 'input[name="field_unlimited[0][value]"].error');
    }
    
    /**
     * Asserts an element specified by an attribute value has focus.
     *
     * @param string $name
     *   The attribute name.
     * @param string $value
     *   The attribute value.
     *
     * @todo Replace with assertHasFocus() in https://drupal.org/i/3041768.
     */
    private function assertHasFocusByAttribute(string $name, string $value) : void {
        $active_element = $this->getSession()
            ->evaluateScript('document.activeElement');
        $this->assertSame($value, $active_element->attribute($name));
    }

}