class Output

abstract class Output implements OutputInterface {
    private int $verbosity;
    private OutputFormatterInterface $formatter;
    
    /**
     * @param int|null                      $verbosity The verbosity level (one of the VERBOSITY constants in OutputInterface)
     * @param bool                          $decorated Whether to decorate messages
     * @param OutputFormatterInterface|null $formatter Output formatter instance (null to use default OutputFormatter)
     */
    public function __construct(?int $verbosity = self::VERBOSITY_NORMAL, bool $decorated = false, ?OutputFormatterInterface $formatter = null) {
        $this->verbosity = $verbosity ?? self::VERBOSITY_NORMAL;
        $this->formatter = $formatter ?? new OutputFormatter();
        $this->formatter
            ->setDecorated($decorated);
    }
    public function setFormatter(OutputFormatterInterface $formatter) : void {
        $this->formatter = $formatter;
    }
    public function getFormatter() : OutputFormatterInterface {
        return $this->formatter;
    }
    public function setDecorated(bool $decorated) : void {
        $this->formatter
            ->setDecorated($decorated);
    }
    public function isDecorated() : bool {
        return $this->formatter
            ->isDecorated();
    }
    public function setVerbosity(int $level) : void {
        $this->verbosity = $level;
    }
    public function getVerbosity() : int {
        return $this->verbosity;
    }
    public function isSilent() : bool {
        return self::VERBOSITY_SILENT === $this->verbosity;
    }
    public function isQuiet() : bool {
        return self::VERBOSITY_QUIET === $this->verbosity;
    }
    public function isVerbose() : bool {
        return self::VERBOSITY_VERBOSE <= $this->verbosity;
    }
    public function isVeryVerbose() : bool {
        return self::VERBOSITY_VERY_VERBOSE <= $this->verbosity;
    }
    public function isDebug() : bool {
        return self::VERBOSITY_DEBUG <= $this->verbosity;
    }
    public function writeln(string|iterable $messages, int $options = self::OUTPUT_NORMAL) : void {
        $this->write($messages, true, $options);
    }
    public function write(string|iterable $messages, bool $newline = false, int $options = self::OUTPUT_NORMAL) : void {
        if (!is_iterable($messages)) {
            $messages = [
                $messages,
            ];
        }
        $types = self::OUTPUT_NORMAL | self::OUTPUT_RAW | self::OUTPUT_PLAIN;
        $type = $types & $options ?: self::OUTPUT_NORMAL;
        $verbosities = self::VERBOSITY_QUIET | self::VERBOSITY_NORMAL | self::VERBOSITY_VERBOSE | self::VERBOSITY_VERY_VERBOSE | self::VERBOSITY_DEBUG;
        $verbosity = $verbosities & $options ?: self::VERBOSITY_NORMAL;
        if ($verbosity > $this->getVerbosity()) {
            return;
        }
        foreach ($messages as $message) {
            switch ($type) {
                case OutputInterface::OUTPUT_NORMAL:
                    $message = $this->formatter
                        ->format($message);
                    break;
                case OutputInterface::OUTPUT_RAW:
                    break;
                case OutputInterface::OUTPUT_PLAIN:
                    $message = strip_tags($this->formatter
                        ->format($message));
                    break;
            }
            $this->doWrite($message ?? '', $newline);
        }
    }
    
    /**
     * Writes a message to the output.
     */
    protected abstract function doWrite(string $message, bool $newline) : void;

}