class EnvironmentCleaner

class EnvironmentCleaner implements EnvironmentCleanerInterface {
    
    /**
     * Constructs a test environment cleaner.
     *
     * @param string $root
     *   The path to the root of the Drupal installation.
     * @param \Drupal\Core\Database\Connection $testDatabase
     *   Connection to the database against which tests were run.
     * @param \Drupal\Core\Test\TestRunResultsStorageInterface $testRunResultsStorage
     *   The test run results storage.
     * @param \Symfony\Component\Console\Output\OutputInterface $output
     *   A Symfony console output object.
     * @param \Drupal\Core\File\FileSystemInterface $fileSystem
     *   Drupal's file_system service.
     */
    public function __construct(string $root, Connection $testDatabase, TestRunResultsStorageInterface $testRunResultsStorage, OutputInterface $output, FileSystemInterface $fileSystem) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function cleanEnvironment(bool $clear_results = TRUE, bool $clear_temp_directories = TRUE, bool $clear_database = TRUE) : void {
        $count = 0;
        if ($clear_database) {
            $this->doCleanDatabase();
        }
        if ($clear_temp_directories) {
            $this->doCleanTemporaryDirectories();
        }
        if ($clear_results) {
            $count = $this->cleanResults();
            $this->output
                ->write('Test results removed: ' . $count);
        }
        else {
            $this->output
                ->write('Test results were not removed.');
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function cleanDatabase() : void {
        $count = $this->doCleanDatabase();
        if ($count > 0) {
            $this->output
                ->write('Leftover tables removed: ' . $count);
        }
        else {
            $this->output
                ->write('No leftover tables to remove.');
        }
    }
    
    /**
     * Performs the fixture database cleanup.
     *
     * @return int
     *   The number of tables that were removed.
     */
    protected function doCleanDatabase() : int {
        
        /** @var \Drupal\Core\Database\Schema $schema */
        $schema = $this->testDatabase
            ->schema();
        $tables = $schema->findTables('test%');
        $count = 0;
        foreach ($tables as $table) {
            // Only drop tables which begin wih 'test' followed by digits, for example,
            // {test12345678node__body}.
            if (preg_match('/^test\\d+.*/', $table, $matches)) {
                $schema->dropTable($matches[0]);
                $count++;
            }
        }
        return $count;
    }
    
    /**
     * {@inheritdoc}
     */
    public function cleanTemporaryDirectories() : void {
        $count = $this->doCleanTemporaryDirectories();
        if ($count > 0) {
            $this->output
                ->write('Temporary directories removed: ' . $count);
        }
        else {
            $this->output
                ->write('No temporary directories to remove.');
        }
    }
    
    /**
     * Performs the cleanup of temporary test directories.
     *
     * @return int
     *   The count of temporary directories removed.
     */
    protected function doCleanTemporaryDirectories() : int {
        $count = 0;
        $simpletest_dir = $this->root . '/sites/simpletest';
        if (is_dir($simpletest_dir)) {
            $files = scandir($simpletest_dir);
            foreach ($files as $file) {
                if ($file[0] != '.') {
                    $path = $simpletest_dir . '/' . $file;
                    $this->fileSystem
                        ->deleteRecursive($path, function ($any_path) {
                        @chmod($any_path, 0700);
                    });
                    $count++;
                }
            }
        }
        return $count;
    }
    
    /**
     * {@inheritdoc}
     */
    public function cleanResults(?TestRun $test_run = NULL) : int {
        return $test_run ? $test_run->removeResults() : $this->testRunResultsStorage
            ->cleanUp();
    }

}