class TestSiteTearDownCommand

class TestSiteTearDownCommand extends Command {
    
    /**
     * {@inheritdoc}
     */
    protected function configure() {
        $this->setName('tear-down')
            ->setDescription('Removes a test site added by the install command')
            ->setHelp('All the database tables and files will be removed.')
            ->addArgument('db-prefix', InputArgument::REQUIRED, 'The database prefix for the test site.')
            ->addOption('db-url', NULL, InputOption::VALUE_OPTIONAL, 'URL for database. Defaults to the environment variable SIMPLETEST_DB.', getenv('SIMPLETEST_DB'))
            ->addOption('keep-lock', NULL, InputOption::VALUE_NONE, 'Keeps the database prefix lock. Useful for ensuring test isolation when running concurrent tests.')
            ->addUsage('test12345678')
            ->addUsage('test12345678 --db-url "mysql://username:password@localhost/database_name#table_prefix"')
            ->addUsage('test12345678 --keep-lock');
    }
    
    /**
     * {@inheritdoc}
     */
    protected function execute(InputInterface $input, OutputInterface $output) : int {
        $root = dirname(__DIR__, 5);
        chdir($root);
        $db_prefix = $input->getArgument('db-prefix');
        // Validate the db_prefix argument.
        try {
            $test_database = new TestDatabase($db_prefix);
        } catch (\InvalidArgumentException) {
            $io = new SymfonyStyle($input, $output);
            $io->getErrorStyle()
                ->error("Invalid database prefix: {$db_prefix}\n\nValid database prefixes match the regular expression '/test(\\d+)\$/'. For example, 'test12345678'.");
            // Display the synopsis of the command like Composer does.
            $output->writeln(sprintf('<info>%s</info>', sprintf($this->getSynopsis(), $this->getName())), OutputInterface::VERBOSITY_QUIET);
            return 1;
        }
        $db_url = $input->getOption('db-url');
        putenv("SIMPLETEST_DB={$db_url}");
        // Handle the cleanup of the test site.
        $this->tearDown($test_database, $db_url);
        // Release the test database prefix lock.
        if (!$input->getOption('keep-lock')) {
            $test_database->releaseLock();
        }
        $output->writeln("<info>Successfully uninstalled {$db_prefix} test site</info>");
        return 0;
    }
    
    /**
     * Removes a given instance by deleting all the database tables and files.
     *
     * @param \Drupal\Core\Test\TestDatabase $test_database
     *   The test database object.
     * @param string $db_url
     *   The database URL.
     *
     * @see \Drupal\Tests\BrowserTestBase::cleanupEnvironment()
     */
    protected function tearDown(TestDatabase $test_database, $db_url) : void {
        // Connect to the test database.
        $root = dirname(__DIR__, 5);
        $database = Database::convertDbUrlToConnectionInfo($db_url, $root);
        $database['prefix'] = $test_database->getDatabasePrefix();
        Database::addConnectionInfo(__CLASS__, 'default', $database);
        // Remove all the tables.
        $schema = Database::getConnection('default', __CLASS__)->schema();
        $tables = $schema->findTables('%');
        array_walk($tables, [
            $schema,
            'dropTable',
        ]);
        // Delete test site directory.
        $this->fileUnmanagedDeleteRecursive($root . DIRECTORY_SEPARATOR . $test_database->getTestSitePath(), [
            BrowserTestBase::class,
            'filePreDeleteCallback',
        ]);
    }
    
    /**
     * Deletes all files and directories in the specified path recursively.
     *
     * Note this method has no dependencies on Drupal core to ensure that the
     * test site can be torn down even if something in the test site is broken.
     *
     * @param string $path
     *   A string containing either a URI or a file or directory path.
     * @param callable $callback
     *   (optional) Callback function to run on each file prior to deleting it and
     *   on each directory prior to traversing it. For example, can be used to
     *   modify permissions.
     *
     * @return bool
     *   TRUE for success or if path does not exist, FALSE in the event of an
     *   error.
     *
     * @see \Drupal\Core\File\FileSystemInterface::deleteRecursive()
     */
    protected function fileUnmanagedDeleteRecursive($path, $callback = NULL) : bool {
        if (isset($callback)) {
            call_user_func($callback, $path);
        }
        if (is_dir($path)) {
            $dir = dir($path);
            while (($entry = $dir->read()) !== FALSE) {
                if ($entry == '.' || $entry == '..') {
                    continue;
                }
                $entry_path = $path . '/' . $entry;
                $this->fileUnmanagedDeleteRecursive($entry_path, $callback);
            }
            $dir->close();
            return rmdir($path);
        }
        return unlink($path);
    }

}