class AjaxCssTest

class AjaxCssTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'ckeditor',
        'ckeditor_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        FilterFormat::create([
            'format' => 'test_format',
            'name' => $this->randomMachineName(),
        ])
            ->save();
        Editor::create([
            'editor' => 'ckeditor',
            'format' => 'test_format',
        ])->save();
        user_role_grant_permissions('anonymous', [
            'use text format test_format',
        ]);
    }
    
    /**
     * Tests adding style sheets dynamically to CKEditor.
     */
    public function testCkeditorAjaxAddCss() {
        $this->drupalGet('/ckeditor_test/ajax_css');
        $session = $this->getSession();
        $page = $session->getPage();
        $this->waitOnCkeditorInstance('edit-iframe-value');
        $this->waitOnCkeditorInstance('edit-inline');
        $style_color = 'rgb(255, 0, 0)';
        // Add the inline CSS and assert that the style is applied to the main body,
        // but not the iframe.
        $page->pressButton('Add CSS to inline CKEditor instance');
        $result = $page->waitFor(10, function () use ($style_color) {
            return $this->getEditorStyle('edit-inline', 'color') == $style_color && $this->getEditorStyle('edit-iframe-value', 'color') != $style_color;
        });
        $this->assertTrue($result);
        $session->reload();
        $this->waitOnCkeditorInstance('edit-iframe-value');
        $this->waitOnCkeditorInstance('edit-inline');
        // Add the iframe CSS and assert that the style is applied to the iframe,
        // but not the main body.
        $page->pressButton('Add CSS to iframe CKEditor instance');
        $result = $page->waitFor(10, function () use ($style_color) {
            return $this->getEditorStyle('edit-inline', 'color') != $style_color && $this->getEditorStyle('edit-iframe-value', 'color') == $style_color;
        });
        $this->assertTrue($result);
    }
    
    /**
     * Gets a computed style value for a CKEditor instance.
     *
     * @param string $instance_id
     *   The CKEditor instance ID.
     * @param string $attribute
     *   The style attribute.
     *
     * @return string
     *   The computed style value.
     */
    protected function getEditorStyle($instance_id, $attribute) {
        $js = sprintf('CKEDITOR.instances["%s"].document.getBody().getComputedStyle("%s")', $instance_id, $attribute);
        return $this->getSession()
            ->evaluateScript($js);
    }
    
    /**
     * Wait for a CKEditor instance to finish loading and initializing.
     *
     * @param string $instance_id
     *   The CKEditor instance ID.
     * @param int $timeout
     *   (optional) Timeout in milliseconds, defaults to 10000.
     */
    protected function waitOnCkeditorInstance($instance_id, $timeout = 10000) {
        $condition = <<<JS
      (function() {
        return (
          typeof CKEDITOR !== 'undefined'
          && typeof CKEDITOR.instances["{<span class="php-variable">$instance_id</span>}"] !== 'undefined'
          && CKEDITOR.instances["{<span class="php-variable">$instance_id</span>}"].instanceReady
        );
      }())
JS;
        $this->getSession()
            ->wait($timeout, $condition);
    }

}