class LocaleUpdateBase

abstract class LocaleUpdateBase extends BrowserTestBase {
    
    /**
     * Timestamp for an old translation.
     *
     * @var int
     */
    protected $timestampOld;
    
    /**
     * Timestamp for a medium aged translation.
     *
     * @var int
     */
    protected $timestampMedium;
    
    /**
     * Timestamp for a new translation.
     *
     * @var int
     */
    protected $timestampNew;
    
    /**
     * Timestamp for current time.
     *
     * @var int
     */
    protected $timestampNow;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'locale',
        'locale_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Setup timestamps to identify old and new translation sources.
        $this->timestampOld = \Drupal::time()->getRequestTime() - 300;
        $this->timestampMedium = \Drupal::time()->getRequestTime() - 200;
        $this->timestampNew = \Drupal::time()->getRequestTime() - 100;
        $this->timestampNow = \Drupal::time()->getRequestTime();
        // Enable import of translations. By default this is disabled for automated
        // tests.
        $this->config('locale.settings')
            ->set('translation.import_enabled', TRUE)
            ->set('translation.use_source', LOCALE_TRANSLATION_USE_SOURCE_LOCAL)
            ->save();
    }
    
    /**
     * Sets the value of the default translations directory.
     *
     * @param string $path
     *   Path of the translations directory relative to the drupal installation
     *   directory.
     */
    protected function setTranslationsDirectory($path) {
        \Drupal::service('file_system')->prepareDirectory($path, FileSystemInterface::CREATE_DIRECTORY);
        $this->config('locale.settings')
            ->set('translation.path', $path)
            ->save();
    }
    
    /**
     * Adds a language.
     *
     * @param string $langcode
     *   The language code of the language to add.
     */
    protected function addLanguage($langcode) {
        $edit = [
            'predefined_langcode' => $langcode,
        ];
        $this->drupalGet('admin/config/regional/language/add');
        $this->submitForm($edit, 'Add language');
        $this->container
            ->get('language_manager')
            ->reset();
        $this->assertNotEmpty(\Drupal::languageManager()->getLanguage($langcode), "Language {$langcode} added.");
    }
    
    /**
     * Creates a translation file and tests its timestamp.
     *
     * @param string $path
     *   Path of the file relative to the public file path.
     * @param string $filename
     *   Name of the file to create.
     * @param int $timestamp
     *   (optional) Timestamp to set the file to. Defaults to current time.
     * @param array $translations
     *   (optional) Array of source/target value translation strings. Only
     *   singular strings are supported, no plurals. No double quotes are allowed
     *   in source and translations strings.
     */
    protected function makePoFile($path, $filename, $timestamp = NULL, array $translations = []) {
        $timestamp = $timestamp ? $timestamp : \Drupal::time()->getRequestTime();
        $path = 'public://' . $path;
        $text = '';
        $po_header = <<<EOF
msgid ""
msgstr ""
"Project-Id-Version: Drupal 8\\n"
"MIME-Version: 1.0\\n"
"Content-Type: text/plain; charset=UTF-8\\n"
"Content-Transfer-Encoding: 8bit\\n"
"Plural-Forms: nplurals=2; plural=(n > 1);\\n"

EOF;
        // Convert array of translations to Gettext source and translation strings.
        if ($translations) {
            foreach ($translations as $source => $target) {
                $text .= 'msgid "' . $source . '"' . "\n";
                $text .= 'msgstr "' . $target . '"' . "\n";
            }
        }
        \Drupal::service('file_system')->prepareDirectory($path, FileSystemInterface::CREATE_DIRECTORY);
        $fileUri = $path . '/' . $filename;
        $file = File::create([
            'uid' => 1,
            'filename' => $filename,
            'uri' => $fileUri,
            'filemime' => 'text/x-gettext-translation',
            'timestamp' => $timestamp,
        ]);
        $file->setPermanent();
        file_put_contents($file->getFileUri(), $po_header . $text);
        touch(\Drupal::service('file_system')->realpath($file->getFileUri()), $timestamp);
        $file->save();
        $this->assertTrue(file_exists($fileUri));
        $this->assertEquals($timestamp, filemtime($fileUri));
    }
    
    /**
     * Setup the environment containing local and remote translation files.
     *
     * Update tests require a simulated environment for local and remote files.
     * Normally remote files are located at a remote server (e.g. ftp.drupal.org).
     * For testing we can not rely on this. A directory in the file system of the
     * test site is designated for remote files and is addressed using an absolute
     * URL. Because Drupal does not allow files with a po extension to be accessed
     * (denied in .htaccess) the translation files get a _po extension. Another
     * directory is designated for local translation files.
     *
     * The environment is set up with the following files. File creation times are
     * set to create different variations in test conditions.
     *   contrib_module_one
     *    - remote file: timestamp new
     *    - local file:  timestamp old
     *   contrib_module_two
     *    - remote file: timestamp old
     *    - local file:  timestamp new
     *   contrib_module_three
     *    - remote file: timestamp old
     *    - local file:  timestamp old
     *   custom_module_one
     *    - local file:  timestamp new
     * Time stamp of current translation set by setCurrentTranslations() is always
     * timestamp medium. This makes it easy to predict which translation will be
     * imported.
     */
    protected function setTranslationFiles() {
        $config = $this->config('locale.settings');
        // A flag is set to let the locale_test module replace the project data with
        // a set of test projects which match the below project files.
        \Drupal::state()->set('locale.test_projects_alter', TRUE);
        \Drupal::state()->set('locale.remove_core_project', FALSE);
        // Setup the environment.
        $public_path = PublicStream::basePath();
        $this->setTranslationsDirectory($public_path . '/local');
        $config->set('translation.default_filename', '%project-%version.%language._po')
            ->save();
        // Setting up sets of translations for the translation files.
        $translations_one = [
            'January' => 'Januar_1',
            'February' => 'Februar_1',
            'March' => 'Marz_1',
        ];
        $translations_two = [
            'February' => 'Februar_2',
            'March' => 'Marz_2',
            'April' => 'April_2',
        ];
        $translations_three = [
            'April' => 'April_3',
            'May' => 'Mai_3',
            'June' => 'Juni_3',
        ];
        // Add a number of files to the local file system to serve as remote
        // translation server and match the project definitions set in
        // locale_test_locale_translation_projects_alter().
        $this->makePoFile('remote/all/contrib_module_one', 'contrib_module_one-8.x-1.1.de._po', $this->timestampNew, $translations_one);
        $this->makePoFile('remote/all/contrib_module_two', 'contrib_module_two-8.x-2.0-beta4.de._po', $this->timestampOld, $translations_two);
        $this->makePoFile('remote/all/contrib_module_three', 'contrib_module_three-8.x-1.0.de._po', $this->timestampOld, $translations_three);
        // Add a number of files to the local file system to serve as local
        // translation files and match the project definitions set in
        // locale_test_locale_translation_projects_alter().
        $this->makePoFile('local', 'contrib_module_one-8.x-1.1.de._po', $this->timestampOld, $translations_one);
        $this->makePoFile('local', 'contrib_module_two-8.x-2.0-beta4.de._po', $this->timestampNew, $translations_two);
        $this->makePoFile('local', 'contrib_module_three-8.x-1.0.de._po', $this->timestampOld, $translations_three);
        $this->makePoFile('local', 'custom_module_one.de.po', $this->timestampNew);
    }
    
    /**
     * Sets up existing translations and their statuses in the database.
     */
    protected function setCurrentTranslations() {
        // Add non customized translations to the database.
        $langcode = 'de';
        $context = '';
        $non_customized_translations = [
            'March' => 'Marz',
            'June' => 'Juni',
        ];
        foreach ($non_customized_translations as $source => $translation) {
            $string = $this->container
                ->get('locale.storage')
                ->createString([
                'source' => $source,
                'context' => $context,
            ])
                ->save();
            $this->container
                ->get('locale.storage')
                ->createTranslation([
                'lid' => $string->getId(),
                'language' => $langcode,
                'translation' => $translation,
                'customized' => LOCALE_NOT_CUSTOMIZED,
            ])
                ->save();
        }
        // Add customized translations to the database.
        $customized_translations = [
            'January' => 'Januar_customized',
            'February' => 'Februar_customized',
            'May' => 'Mai_customized',
        ];
        foreach ($customized_translations as $source => $translation) {
            $string = $this->container
                ->get('locale.storage')
                ->createString([
                'source' => $source,
                'context' => $context,
            ])
                ->save();
            $this->container
                ->get('locale.storage')
                ->createTranslation([
                'lid' => $string->getId(),
                'language' => $langcode,
                'translation' => $translation,
                'customized' => LOCALE_CUSTOMIZED,
            ])
                ->save();
        }
        // Add a state of current translations in locale_files.
        $default = [
            'langcode' => $langcode,
            'uri' => '',
            'timestamp' => $this->timestampMedium,
            'last_checked' => $this->timestampMedium,
        ];
        $data[] = [
            'project' => 'contrib_module_one',
            'filename' => 'contrib_module_one-8.x-1.1.de._po',
            'version' => '8.x-1.1',
        ];
        $data[] = [
            'project' => 'contrib_module_two',
            'filename' => 'contrib_module_two-8.x-2.0-beta4.de._po',
            'version' => '8.x-2.0-beta4',
        ];
        $data[] = [
            'project' => 'contrib_module_three',
            'filename' => 'contrib_module_three-8.x-1.0.de._po',
            'version' => '8.x-1.0',
        ];
        $data[] = [
            'project' => 'custom_module_one',
            'filename' => 'custom_module_one.de.po',
            'version' => '',
        ];
        $connection = Database::getConnection();
        foreach ($data as $file) {
            $file = array_merge($default, $file);
            $connection->insert('locale_file')
                ->fields($file)
                ->execute();
        }
    }
    
    /**
     * Checks the translation of a string.
     *
     * @param string $source
     *   Translation source string.
     * @param string $translation
     *   Translation to check. Use empty string to check for a non-existent
     *   translation.
     * @param string $langcode
     *   Language code of the language to translate to.
     * @param string $message
     *   (optional) A message to display with the assertion.
     */
    protected function assertTranslation($source, $translation, $langcode, $message = '') {
        $query = Database::getConnection()->select('locales_target', 'lt');
        $query->innerJoin('locales_source', 'ls', '[ls].[lid] = [lt].[lid]');
        $db_translation = $query->fields('lt', [
            'translation',
        ])
            ->condition('ls.source', $source)
            ->condition('lt.language', $langcode)
            ->execute()
            ->fetchField();
        $db_translation = $db_translation == FALSE ? '' : $db_translation;
        $this->assertEquals($translation, $db_translation, $message ?: "Correct translation of {$source} ({$langcode})");
    }

}