class SystemTestHooks

class SystemTestHooks {
    
    /**
     * Implements hook_help().
     */
    public function help($route_name, RouteMatchInterface $route_match) {
        switch ($route_name) {
            case 'help.page.system_test':
                $output = '';
                $output .= '<h2>' . t('Test Help Page') . '</h2>';
                $output .= '<p>' . t('This is a test help page for the system_test module for the purpose of testing if the "Help" link displays properly.') . '</p>';
                return $output;
        }
    }
    
    /**
     * Implements hook_modules_installed().
     */
    public function modulesInstalled($modules) {
        if (\Drupal::state()->get('system_test.verbose_module_hooks')) {
            foreach ($modules as $module) {
                \Drupal::messenger()->addStatus(t('hook_modules_installed fired for @module', [
                    '@module' => $module,
                ]));
            }
        }
    }
    
    /**
     * Implements hook_modules_uninstalled().
     */
    public function modulesUninstalled($modules, $is_syncing) {
        if (\Drupal::state()->get('system_test.verbose_module_hooks')) {
            foreach ($modules as $module) {
                \Drupal::messenger()->addStatus(t('hook_modules_uninstalled fired for @module', [
                    '@module' => $module,
                ]));
            }
        }
        // Save the config.installer isSyncing() value to state to check that it is
        // correctly set when installing module during config import.
        \Drupal::state()->set('system_test_modules_uninstalled_config_installer_syncing', \Drupal::service('config.installer')->isSyncing());
        // Save the $is_syncing parameter value to state to check that it is correctly
        // set when installing module during config import.
        \Drupal::state()->set('system_test_modules_uninstalled_syncing_param', $is_syncing);
    }
    
    /**
     * Implements hook_system_info_alter().
     */
    public function systemInfoAlter(&$info, Extension $file, $type) {
        // We need a static otherwise the last test will fail to alter common_test.
        static $test;
        if (($dependencies = \Drupal::state()->get('system_test.dependencies')) || $test) {
            if ($file->getName() == 'module_test') {
                $info['hidden'] = FALSE;
                $info['dependencies'][] = array_shift($dependencies);
                \Drupal::state()->set('system_test.dependencies', $dependencies);
                $test = TRUE;
            }
            if ($file->getName() == 'common_test') {
                $info['hidden'] = FALSE;
                $info['version'] = '8.x-2.4-beta3';
            }
        }
        // Make the system_dependencies_test visible by default.
        if ($file->getName() == 'system_dependencies_test') {
            $info['hidden'] = FALSE;
        }
        if (in_array($file->getName(), [
            'system_incompatible_module_version_dependencies_test',
            'system_incompatible_core_version_dependencies_test',
            'system_incompatible_module_version_test',
        ])) {
            $info['hidden'] = FALSE;
        }
        if ($file->getName() == 'requirements1_test' || $file->getName() == 'requirements2_test') {
            $info['hidden'] = FALSE;
        }
        if ($file->getName() == 'system_test') {
            $info['hidden'] = \Drupal::state()->get('system_test.module_hidden', TRUE);
        }
    }
    
    /**
     * Implements hook_page_attachments().
     */
    public function pageAttachments(array &$page) {
        // Used by FrontPageTestCase to get the results of
        // \Drupal::service('path.matcher')->isFrontPage().
        $frontpage = \Drupal::state()->get('system_test.front_page_output', 0);
        if ($frontpage && \Drupal::service('path.matcher')->isFrontPage()) {
            \Drupal::messenger()->addStatus(t('On front page.'));
        }
    }
    
    /**
     * Implements hook_filetransfer_info().
     */
    public function filetransferInfo() {
        return [
            'system_test' => [
                'title' => t('System Test FileTransfer'),
                'class' => 'Drupal\\system_test\\MockFileTransfer',
                'weight' => -10,
            ],
        ];
    }
    
    /**
     * Implements hook_module_preinstall().
     */
    public function modulePreinstall($module, bool $is_syncing) {
        \Drupal::messenger()->addStatus('system_test_preinstall_module called');
        \Drupal::state()->set('system_test_preinstall_module', $module);
        // Save the config.installer isSyncing() value to state to check that it is
        // correctly set when installing module during config import.
        \Drupal::state()->set('system_test_preinstall_module_config_installer_syncing', \Drupal::service('config.installer')->isSyncing());
        // Save the $is_syncing parameter value to state to check that it is correctly
        // set when installing module during config import.
        \Drupal::state()->set('system_test_preinstall_module_syncing_param', $is_syncing);
    }
    
    /**
     * Implements hook_module_preuninstall().
     */
    public function modulePreuninstall($module, bool $is_syncing) {
        \Drupal::state()->set('system_test_preuninstall_module', $module);
        // Save the config.installer isSyncing() value to state to check that it is
        // correctly set when uninstalling module during config import.
        \Drupal::state()->set('system_test_preuninstall_module_config_installer_syncing', \Drupal::service('config.installer')->isSyncing());
        // Save the $is_syncing parameter value to state to check that it is correctly
        // set when installing module during config import.
        \Drupal::state()->set('system_test_preuninstall_module_syncing_param', $is_syncing);
    }

}