class CommonTestHooks

class CommonTestHooks {
    
    /**
     * Implements hook_TYPE_alter().
     */
    public function drupalAlterAlter(&$data, &$arg2 = NULL, &$arg3 = NULL) {
        // Alter first argument.
        if (is_array($data)) {
            $data['foo'] = 'Drupal';
        }
        elseif (is_object($data)) {
            $data->foo = 'Drupal';
        }
        // Alter second argument, if present.
        if (isset($arg2)) {
            if (is_array($arg2)) {
                $arg2['foo'] = 'Drupal';
            }
            elseif (is_object($arg2)) {
                $arg2->foo = 'Drupal';
            }
        }
        // Try to alter third argument, if present.
        if (isset($arg3)) {
            if (is_array($arg3)) {
                $arg3['foo'] = 'Drupal';
            }
            elseif (is_object($arg3)) {
                $arg3->foo = 'Drupal';
            }
        }
    }
    
    /**
     * Implements hook_TYPE_alter().
     *
     * This is to verify that
     * \Drupal::moduleHandler()->alter(array(TYPE1, TYPE2), ...) allows
     * hook_module_implements_alter() to affect the order in which module
     * implementations are executed.
     */
    public function blockDrupalAlterFooAlter(&$data, &$arg2 = NULL, &$arg3 = NULL) {
        $data['foo'] .= ' block';
    }
    
    /**
     * Implements hook_theme().
     */
    public function theme() : array {
        return [
            'common_test_foo' => [
                'variables' => [
                    'foo' => 'foo',
                    'bar' => 'bar',
                ],
            ],
            'common_test_render_element' => [
                'render element' => 'foo',
            ],
        ];
    }
    
    /**
     * Implements hook_library_info_build().
     */
    public function libraryInfoBuild() {
        $libraries = [];
        if (\Drupal::state()->get('common_test.library_info_build_test')) {
            $libraries['dynamic_library'] = [
                'version' => '1.0',
                'css' => [
                    'base' => [
                        'common_test.css' => [],
                    ],
                ],
            ];
        }
        return $libraries;
    }
    
    /**
     * Implements hook_library_info_alter().
     */
    public function libraryInfoAlter(&$libraries, $module) {
        if ($module === 'core' && isset($libraries['loadjs'])) {
            // Change the version of loadjs to 0.0.
            $libraries['loadjs']['version'] = '0.0';
            // Make loadjs depend on jQuery Form to test library dependencies.
            $libraries['loadjs']['dependencies'][] = 'core/internal.jquery.form';
        }
        // Alter the dynamically registered library definition.
        if ($module === 'common_test' && isset($libraries['dynamic_library'])) {
            $libraries['dynamic_library']['dependencies'] = [
                'core/jquery',
            ];
        }
    }
    
    /**
     * Implements hook_cron().
     *
     * System module should handle if a module does not catch an exception and keep
     * cron going.
     *
     * @see common_test_cron_helper()
     */
    public function cron() {
        throw new \Exception('Uncaught exception');
    }
    
    /**
     * Implements hook_page_attachments().
     *
     * @see \Drupal\system\Tests\Common\PageRenderTest::assertPageRenderHookExceptions()
     */
    public function pageAttachments(array &$page) {
        $page['#attached']['library'][] = 'core/foo';
        $page['#attached']['library'][] = 'core/bar';
        $page['#cache']['tags'] = [
            'example',
        ];
        $page['#cache']['contexts'] = [
            'user.permissions',
        ];
        if (\Drupal::state()->get('common_test.hook_page_attachments.descendant_attached', FALSE)) {
            $page['content']['#attached']['library'][] = 'core/jquery';
        }
        if (\Drupal::state()->get('common_test.hook_page_attachments.render_array', FALSE)) {
            $page['something'] = [
                '#markup' => 'test',
            ];
        }
        if (\Drupal::state()->get('common_test.hook_page_attachments.early_rendering', FALSE)) {
            // Do some early rendering.
            $element = [
                '#markup' => '123',
            ];
            \Drupal::service('renderer')->render($element);
        }
    }
    
    /**
     * Implements hook_page_attachments_alter().
     *
     * @see \Drupal\system\Tests\Common\PageRenderTest::assertPageRenderHookExceptions()
     */
    public function pageAttachmentsAlter(array &$page) {
        // Remove a library that was added in common_test_page_attachments(), to test
        // that this hook can do what it claims to do.
        if (isset($page['#attached']['library']) && ($index = array_search('core/bar', $page['#attached']['library'])) && $index !== FALSE) {
            unset($page['#attached']['library'][$index]);
        }
        $page['#attached']['library'][] = 'core/baz';
        $page['#cache']['tags'] = [
            'example',
        ];
        $page['#cache']['contexts'] = [
            'user.permissions',
        ];
        if (\Drupal::state()->get('common_test.hook_page_attachments_alter.descendant_attached', FALSE)) {
            $page['content']['#attached']['library'][] = 'core/jquery';
        }
        if (\Drupal::state()->get('common_test.hook_page_attachments_alter.render_array', FALSE)) {
            $page['something'] = [
                '#markup' => 'test',
            ];
        }
    }
    
    /**
     * Implements hook_js_alter().
     *
     * @see \Drupal\KernelTests\Core\Asset\AttachedAssetsTest::testAlter()
     */
    public function jsAlter(&$javascript, AttachedAssetsInterface $assets, LanguageInterface $language) {
        // Attach alter.js above tableselect.js.
        $alter_js = \Drupal::service('extension.list.module')->getPath('common_test') . '/alter.js';
        if (array_key_exists($alter_js, $javascript) && array_key_exists('core/misc/tableselect.js', $javascript)) {
            $javascript[$alter_js]['weight'] = $javascript['core/misc/tableselect.js']['weight'] - 1;
        }
    }
    
    /**
     * Implements hook_js_settings_alter().
     *
     * @see \Drupal\system\Tests\Common\JavaScriptTest::testHeaderSetting()
     */
    public function jsSettingsAlter(&$settings, AttachedAssetsInterface $assets) {
        // Modify an existing setting.
        if (array_key_exists('pluralDelimiter', $settings)) {
            $settings['pluralDelimiter'] = '☃';
        }
        // Add a setting.
        $settings['foo'] = 'bar';
    }

}