trait FieldUiTestTrait

trait FieldUiTestTrait {
    
    /**
     * Creates a new field through the Field UI.
     *
     * @param string $bundle_path
     *   Admin path of the bundle that the new field is to be attached to.
     * @param string $field_name
     *   The field name of the new field storage.
     * @param string $label
     *   (optional) The label of the new field. Defaults to a random string.
     * @param string $field_type
     *   (optional) The field type of the new field storage. Defaults to
     *   'test_field'.
     * @param array $storage_edit
     *   (optional) $edit parameter for submitForm() on the second step
     *   ('Storage settings' form).
     * @param array $field_edit
     *   (optional) $edit parameter for submitForm() on the third step ('Field
     *   settings' form).
     * @param bool $save_settings
     *   (optional) Parameter for conditional execution of second and third step
     *   (Saving the storage settings and field settings). Defaults to 'TRUE'.
     */
    public function fieldUIAddNewField($bundle_path, $field_name, $label = NULL, $field_type = 'test_field', array $storage_edit = [], array $field_edit = [], bool $save_settings = TRUE) {
        // Generate a label containing only letters and numbers to prevent random
        // test failure.
        // See https://www.drupal.org/project/drupal/issues/3030902
        $label = $label ?: $this->randomMachineName();
        $initial_edit = [
            'new_storage_type' => $field_type,
        ];
        $second_edit = [
            'label' => $label,
            'field_name' => $field_name,
        ];
        // Allow the caller to set a NULL path in case they navigated to the right
        // page before calling this method.
        if ($bundle_path !== NULL) {
            $bundle_path = "{$bundle_path}/fields/add-field";
            // First step: 'Add field' page.
            $this->drupalGet($bundle_path);
        }
        else {
            $bundle_path = $this->getUrl();
        }
        try {
            // First check if the passed in field type is not part of a group.
            $this->assertSession()
                ->elementExists('css', "[name='new_storage_type'][value='{$field_type}']");
        } catch (ElementNotFoundException) {
            // Call the helper function to confirm it is in a group.
            $field_group = $this->getFieldFromGroup($field_type);
            if ($field_group) {
                // Pass in the group name as the new storage type.
                $initial_edit['new_storage_type'] = $field_group;
                $second_edit['group_field_options_wrapper'] = $field_type;
                $this->drupalGet($bundle_path);
            }
        }
        $this->submitForm($initial_edit, 'Continue');
        $this->submitForm($second_edit, 'Continue');
        // Assert that the field is not created.
        $this->assertFieldDoesNotExist($bundle_path, $label);
        if ($save_settings) {
            $this->assertSession()
                ->pageTextContains("These settings apply to the {$label} field everywhere it is used.");
            // Test Breadcrumbs.
            $this->getSession()
                ->getPage()
                ->findLink($label);
            // Ensure that each array key in $storage_edit is prefixed with field_storage.
            $prefixed_storage_edit = [];
            foreach ($storage_edit as $key => $value) {
                if (str_starts_with($key, 'field_storage')) {
                    $prefixed_storage_edit[$key] = $value;
                    continue;
                }
                // If the key starts with settings, it needs to be prefixed differently.
                if (str_starts_with($key, 'settings[')) {
                    $prefixed_storage_edit[str_replace('settings[', 'field_storage[subform][settings][', $key)] = $value;
                    continue;
                }
                $prefixed_storage_edit['field_storage[subform][' . $key . ']'] = $value;
            }
            // Second step: 'Storage settings' form.
            $this->submitForm($prefixed_storage_edit, 'Update settings');
            // Third step: 'Field settings' form.
            $this->submitForm($field_edit, 'Save settings');
            $this->assertSession()
                ->pageTextContains("Saved {$label} configuration.");
            // Check that the field appears in the overview form.
            $this->assertFieldExistsOnOverview($label);
        }
    }
    
    /**
     * Adds an existing field through the Field UI.
     *
     * @param string $bundle_path
     *   Admin path of the bundle that the field is to be attached to.
     * @param string $existing_storage_name
     *   The name of the existing field storage for which we want to add a new
     *   field.
     * @param string $label
     *   (optional) The label of the new field. Defaults to a random string.
     * @param array $field_edit
     *   (optional) $edit parameter for submitForm() on the second step
     *   ('Field settings' form).
     */
    public function fieldUIAddExistingField($bundle_path, $existing_storage_name, $label = NULL, array $field_edit = []) {
        $label = $label ?: $this->randomMachineName();
        $field_edit['edit-label'] = $label;
        // First step: navigate to the re-use field page.
        $this->drupalGet("{$bundle_path}/fields/");
        // Confirm that the local action is visible.
        $this->assertSession()
            ->linkExists('Re-use an existing field');
        $this->clickLink('Re-use an existing field');
        $this->assertSession()
            ->elementExists('css', "input[value=Re-use][name={$existing_storage_name}]");
        $this->click("input[value=Re-use][name={$existing_storage_name}]");
        // Set the main content to only the content region because the label can
        // contain HTML which will be auto-escaped by Twig.
        $this->assertSession()
            ->responseContains('field-config-edit-form');
        // Check that the page does not have double escaped HTML tags.
        $this->assertSession()
            ->responseNotContains('<');
        // Second step: 'Field settings' form.
        $this->submitForm($field_edit, 'Save settings');
        $this->assertSession()
            ->pageTextContains("Saved {$label} configuration.");
        // Check that the field appears in the overview form.
        $xpath = $this->assertSession()
            ->buildXPathQuery("//table[@id=\"field-overview\"]//tr/td[1 and text() = :label]", [
            ':label' => $label,
        ]);
        $this->assertSession()
            ->elementExists('xpath', $xpath);
    }
    
    /**
     * Deletes a field through the Field UI.
     *
     * @param string $bundle_path
     *   Admin path of the bundle that the field is to be deleted from.
     * @param string $field_name
     *   The name of the field.
     * @param string $label
     *   The label of the field.
     * @param string $bundle_label
     *   The label of the bundle.
     * @param string $source_label
     *   (optional) The label of the source entity type bundle.
     */
    public function fieldUIDeleteField($bundle_path, $field_name, $label, $bundle_label, string $source_label = '') {
        // Display confirmation form.
        $this->drupalGet("{$bundle_path}/fields/{$field_name}/delete");
        $this->assertSession()
            ->pageTextContains("Are you sure you want to delete the field {$label}");
        // Test Breadcrumbs.
        $this->assertSession()
            ->linkExists($label, 0, 'Field label is correct in the breadcrumb of the field delete page.');
        // Submit confirmation form.
        $this->submitForm([], 'Delete');
        $this->assertSession()
            ->pageTextContains("The field {$label} has been deleted from the {$bundle_label} {$source_label}");
        // Check that the field does not appear in the overview form.
        $xpath = $this->assertSession()
            ->buildXPathQuery('//table[@id="field-overview"]//span[@class="label-field" and text()= :label]', [
            ':label' => $label,
        ]);
        $this->assertSession()
            ->elementNotExists('xpath', $xpath);
    }
    
    /**
     * Helper function that returns the name of the group that a field is in.
     *
     * @param string $field_type
     *   The name of the field type.
     *
     * @return string
     *   Group name
     */
    public function getFieldFromGroup($field_type) {
        $group_elements = $this->getSession()
            ->getPage()
            ->findAll('css', '.field-option-radio');
        $groups = [];
        foreach ($group_elements as $group_element) {
            $groups[] = $group_element->getAttribute('value');
        }
        foreach ($groups as $group) {
            $test = [
                'new_storage_type' => $group,
            ];
            $this->submitForm($test, 'Continue');
            try {
                $this->assertSession()
                    ->elementExists('css', "[name='group_field_options_wrapper'][value='{$field_type}']");
                $this->submitForm([], 'Back');
                return $group;
            } catch (ElementNotFoundException) {
                $this->submitForm([], 'Back');
                continue;
            }
        }
        return NULL;
    }
    
    /**
     * Asserts that the field doesn't exist in the overview form.
     *
     * @param string $bundle_path
     *   The bundle path.
     * @param string $label
     *   The field label.
     */
    protected function assertFieldDoesNotExist(string $bundle_path, string $label) {
        $original_url = $this->getUrl();
        $this->drupalGet(explode('/fields', $bundle_path)[0] . '/fields');
        $this->assertFieldDoesNotExistOnOverview($label);
        $this->drupalGet($original_url);
    }
    
    /**
     * Asserts that the field appears on the overview form.
     *
     * @param string $label
     *   The field label.
     *
     * @throws \Behat\Mink\Exception\ElementNotFoundException
     */
    protected function assertFieldExistsOnOverview(string $label) {
        $xpath = $this->assertSession()
            ->buildXPathQuery("//table[@id=\"field-overview\"]//tr/td[1 and text() = :label]", [
            ':label' => $label,
        ]);
        $element = $this->getSession()
            ->getPage()
            ->find('xpath', $xpath);
        if ($element === NULL) {
            throw new ElementNotFoundException($this->getSession()
                ->getDriver(), 'form field', 'label', $label);
        }
    }
    
    /**
     * Asserts that the field does not appear on the overview form.
     *
     * @param string $label
     *   The field label.
     */
    protected function assertFieldDoesNotExistOnOverview(string $label) {
        $xpath = $this->assertSession()
            ->buildXPathQuery("//table[@id=\"field-overview\"]//tr/td[1 and text() = :label]", [
            ':label' => $label,
        ]);
        $element = $this->getSession()
            ->getPage()
            ->find('xpath', $xpath);
        $this->assertSession()
            ->assert($element === NULL, sprintf('A field "%s" appears on this page, but it should not.', $label));
    }
    
    /**
     * Asserts that a header cell appears on a table.
     *
     * @param string $table_id
     *   The HTML attribute value to target a given table.
     * @param string $label
     *   The cell label.
     */
    protected function assertTableHeaderExistsByLabel(string $table_id, string $label) : void {
        $expression = '//table[@id=:id]//tr//th[1 and text() = :label]';
        $xpath = $this->assertSession()
            ->buildXPathQuery($expression, [
            ':id' => $table_id,
            ':label' => $label,
        ]);
        $element = $this->getSession()
            ->getPage()
            ->find('xpath', $xpath);
        $this->assertSession()
            ->assert($element !== NULL, sprintf('Table header not found by label: "%s".', $label));
    }

}