class ThemeTestController

class ThemeTestController extends ControllerBase {
    
    /**
     * Adds stylesheets to test theme .info.yml property processing.
     *
     * @return array
     *   A render array containing custom stylesheets.
     */
    public function testInfoStylesheets() {
        return [
            '#attached' => [
                'library' => [
                    'theme_test/theme_stylesheets_override_and_remove_test',
                ],
            ],
        ];
    }
    
    /**
     * Tests template overriding based on filename.
     *
     * @return array
     *   A render array containing a theme override.
     */
    public function testTemplate() {
        return [
            '#markup' => \Drupal::theme()->render('theme_test_template_test', []),
        ];
    }
    
    /**
     * Tests the inline template functionality.
     *
     * @return array
     *   A render array containing an inline template.
     */
    public function testInlineTemplate() {
        $element = [];
        $element['test'] = [
            '#type' => 'inline_template',
            '#template' => 'test-with-context {{ llama }}',
            '#context' => [
                'llama' => 'muuh',
            ],
        ];
        return $element;
    }
    
    /**
     * Calls a theme hook suggestion.
     *
     * @return string
     *   An HTML string containing the themed output.
     */
    public function testSuggestion() {
        return [
            '#markup' => \Drupal::theme()->render([
                'theme_test__suggestion',
                'theme_test',
            ], []),
        ];
    }
    
    /**
     * Tests themed output generated in a request listener.
     *
     * @return string
     *   Content in theme_test_output GLOBAL.
     */
    public function testRequestListener() {
        return [
            '#markup' => $GLOBALS['theme_test_output'],
        ];
    }
    
    /**
     * Menu callback for testing suggestion alter hooks with template files.
     */
    public function suggestionProvided() {
        return [
            '#theme' => 'theme_test_suggestion_provided',
        ];
    }
    
    /**
     * Menu callback for testing suggestion alter hooks with template files.
     */
    public function suggestionAlter() {
        return [
            '#theme' => 'theme_test_suggestions',
        ];
    }
    
    /**
     * Menu callback for testing hook_theme_suggestions_alter().
     */
    public function generalSuggestionAlter() {
        return [
            '#theme' => 'theme_test_general_suggestions',
        ];
    }
    
    /**
     * Menu callback for testing suggestion alter hooks with specific suggestions.
     */
    public function specificSuggestionAlter() {
        return [
            '#theme' => 'theme_test_specific_suggestions__variant',
        ];
    }
    
    /**
     * Controller to ensure that no theme is initialized.
     *
     * @return \Symfony\Component\HttpFoundation\JsonResponse
     *   The json response with the theme initialized information.
     */
    public function nonHtml() {
        $theme_initialized = \Drupal::theme()->hasActiveTheme();
        return new JsonResponse([
            'theme_initialized' => $theme_initialized,
        ]);
    }
    
    /**
     * Controller for testing preprocess functions with theme suggestions.
     */
    public function preprocessSuggestions() {
        return [
            [
                '#theme' => 'theme_test_preprocess_suggestions',
                '#foo' => 'suggestion',
            ],
            [
                '#theme' => 'theme_test_preprocess_suggestions',
                '#foo' => 'kitten',
            ],
            [
                '#theme' => 'theme_test_preprocess_suggestions',
                '#foo' => 'monkey',
            ],
            [
                '#theme' => 'theme_test_preprocess_suggestions__kitten__flamingo',
            ],
        ];
    }
    
    /**
     * Controller for testing callable preprocess functions.
     */
    public function preprocessCallback() {
        return [
            '#theme' => 'theme_test_preprocess_callback',
        ];
    }
    
    /**
     * Controller for testing a namespaced class in a theme.
     */
    public function testThemeClass() {
        return [
            '#theme' => 'theme_test_theme_class',
            '#title' => 'Testing loading a class from a .theme file',
        ];
    }

}