class LinkFieldUITest

class LinkFieldUITest extends BrowserTestBase {
    use FieldUiTestTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'node',
        'link',
        'field_ui',
        'block',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * A user that can edit content types.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $adminUser;
    
    /**
     * A user that should see the help texts.
     *
     * @var \Drupal\user\Entity\User
     */
    protected $helpTextUser;
    
    /**
     * The content type to add fields to.
     *
     * @var \Drupal\node\Entity\NodeType
     */
    protected $contentType;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->contentType = $this->drupalCreateContentType();
        $this->adminUser = $this->drupalCreateUser([
            'administer content types',
            'administer node fields',
            'administer node display',
        ]);
        $this->helpTextUser = $this->drupalCreateUser([
            'create ' . $this->contentType
                ->id() . ' content',
        ]);
        $this->drupalPlaceBlock('system_breadcrumb_block');
    }
    
    /**
     * Tests the link field UI.
     */
    public function testFieldUI() : void {
        foreach ($this->providerTestFieldUI() as $item) {
            [
                $cardinality,
                $link_type,
                $title,
                $label,
                $field_name,
                $default_uri,
            ] = $item;
            $this->runFieldUIItem($cardinality, $link_type, $title, $label, $field_name, $default_uri);
        }
    }
    
    /**
     * Provides test data for ::testFieldUI().
     */
    protected function providerTestFieldUI() {
        // There are many combinations of field settings: where the description
        // should show: variation on internal, external, both; cardinality (where
        // the fieldset is hidden or used); and link text shown (required or
        // optional) or disabled. There are two descriptions: field and URL help
        // text.
        $cardinalities = [
            1,
            2,
        ];
        $title_settings = [
            DRUPAL_DISABLED,
            DRUPAL_OPTIONAL,
        ];
        $link_types = [
            LinkItemInterface::LINK_EXTERNAL => 'https://example.com',
            LinkItemInterface::LINK_GENERIC => '',
            LinkItemInterface::LINK_INTERNAL => '<front>',
        ];
        // Test all variations of link types on all cardinalities.
        foreach ($cardinalities as $cardinality) {
            foreach ($link_types as $link_type => $default_uri) {
                // Now, test this with both the title enabled and disabled.
                foreach ($title_settings as $title_setting) {
                    // Test both empty and non-empty labels.
                    foreach ([
                        TRUE,
                        FALSE,
                    ] as $label_provided) {
                        // Generate a unique machine name for the field so it can be
                        // identified in the test.
                        $id = implode('_', [
                            'link',
                            $cardinality,
                            $link_type,
                            $title_setting,
                            (int) $label_provided,
                        ]);
                        // Use a unique label that contains some HTML.
                        $label = '<img src="https://example.com">' . $id;
                        (yield [
                            $cardinality,
                            $link_type,
                            $title_setting,
                            $label_provided ? $label : '',
                            $id,
                            $default_uri,
                        ]);
                    }
                }
            }
        }
    }
    
    /**
     * Tests one link field UI item.
     *
     * @param int $cardinality
     *   The field cardinality.
     * @param int $link_type
     *   Determine if the link is external, internal or both.
     * @param int $title
     *   Determine if the field will display the link text field.
     * @param string $label
     *   The field label.
     * @param string $field_name
     *   The unique machine name for the field.
     * @param string $default_uri
     *   The default URI value.
     */
    public function runFieldUIItem($cardinality, $link_type, $title, $label, $field_name, $default_uri) : void {
        $this->drupalLogin($this->adminUser);
        $type_path = 'admin/structure/types/manage/' . $this->contentType
            ->id();
        // Add a link field to the newly-created type.
        $description = 'link field description';
        $field_edit = [
            'description' => $description,
            'settings[link_type]' => (int) $link_type,
        ];
        if (!empty($default_uri)) {
            $field_edit['set_default_value'] = '1';
            $field_edit['default_value_input[field_' . $field_name . '][0][uri]'] = $default_uri;
            $field_edit['default_value_input[field_' . $field_name . '][0][title]'] = 'Default title';
        }
        $storage_edit = [
            'cardinality_number' => $cardinality,
        ];
        $this->fieldUIAddNewField($type_path, $field_name, $label, 'link', $storage_edit, $field_edit);
        // Load the formatter page to check that the settings summary does not
        // generate warnings.
        // @todo Mess with the formatter settings a bit here.
        $this->drupalGet("{$type_path}/display");
        $this->assertSession()
            ->pageTextContains('Link text trimmed to 80 characters');
        // Make the fields visible in the form display.
        $form_display_id = implode('.', [
            'node',
            $this->contentType
                ->id(),
            'default',
        ]);
        $form_display = EntityFormDisplay::load($form_display_id);
        $form_display->setComponent($field_name, [
            'region' => 'content',
        ]);
        $form_display->save();
        // Log in a user that is allowed to create this content type, see if
        // the user can see the expected help text.
        $this->drupalLogin($this->helpTextUser);
        $add_path = 'node/add/' . $this->contentType
            ->id();
        $this->drupalGet($add_path);
        $expected_help_texts = [
            LinkItemInterface::LINK_EXTERNAL => 'This must be an external URL such as <em class="placeholder">https://example.com</em>.',
            LinkItemInterface::LINK_GENERIC => 'You can also enter an internal path such as <em class="placeholder">/node/add</em> or an external URL such as <em class="placeholder">https://example.com</em>. Enter <em class="placeholder">&lt;front&gt;</em> to link to the front page. Enter <em class="placeholder">&lt;nolink&gt;</em> to display link text only',
            LinkItemInterface::LINK_INTERNAL => rtrim(Url::fromRoute('<front>', [], [
                'absolute' => TRUE,
            ])->toString(), '/'),
        ];
        // Check that the help texts we assume should be there, is there.
        $this->assertFieldContainsRawText($field_name, $expected_help_texts[$link_type]);
        if ($link_type === LinkItemInterface::LINK_INTERNAL) {
            // Internal links have no "system" description. Test that none
            // of the other help texts show here.
            $this->assertNoFieldContainsRawText($field_name, $expected_help_texts[LinkItemInterface::LINK_EXTERNAL]);
            $this->assertNoFieldContainsRawText($field_name, $expected_help_texts[LinkItemInterface::LINK_GENERIC]);
        }
        // Also assert that the description we made is here, no matter what the
        // cardinality or link setting.
        if (!empty($label)) {
            $this->assertFieldContainsRawText($field_name, $label);
        }
        // Test the default field value is used as expected.
        $this->assertSession()
            ->fieldValueEquals('field_' . $field_name . '[0][uri]', $default_uri);
    }
    
    /**
     * Checks that given field contains the given raw text.
     *
     * @param string $field_name
     *   The name of the field to check.
     * @param string $text
     *   The text to check.
     *
     * @internal
     */
    protected function assertFieldContainsRawText(string $field_name, string $text) : void {
        $this->assertTrue((bool) preg_match('/' . preg_quote($text, '/') . '/ui', $this->getFieldHtml($field_name)));
    }
    
    /**
     * Checks that given field does not contain the given raw text.
     *
     * @param string $field_name
     *   The name of the field to check.
     * @param string $text
     *   The text to check.
     *
     * @internal
     */
    protected function assertNoFieldContainsRawText(string $field_name, string $text) : void {
        $this->assertFalse((bool) preg_match('/' . preg_quote($text, '/') . '/ui', $this->getFieldHtml($field_name)));
    }
    
    /**
     * Returns the raw HTML for the given field.
     *
     * @param string $field_name
     *   The name of the field for which to return the HTML.
     *
     * @return string
     *   The raw HTML.
     */
    protected function getFieldHtml($field_name) {
        $css_id = Html::cleanCssIdentifier('edit-field-' . $field_name . '-wrapper');
        return $this->xpath('//*[@id=:id]', [
            ':id' => $css_id,
        ])[0]
            ->getHtml();
    }

}