class Question

class Question {
    private ?int $attempts = null;
    private bool $hidden = false;
    private bool $hiddenFallback = true;
    private ?\Closure $autocompleterCallback = null;
    private ?\Closure $validator = null;
    private ?\Closure $normalizer = null;
    private bool $trimmable = true;
    private bool $multiline = false;
    
    /**
     * @param string                     $question The question to ask to the user
     * @param string|bool|int|float|null $default  The default answer to return if the user enters nothing
     */
    public function __construct(string $question, string|bool|int|float|null $default = null) {
    }
    
    /**
     * Returns the question.
     */
    public function getQuestion() : string {
        return $this->question;
    }
    
    /**
     * Returns the default answer.
     */
    public function getDefault() : string|bool|int|float|null {
        return $this->default;
    }
    
    /**
     * Returns whether the user response accepts newline characters.
     */
    public function isMultiline() : bool {
        return $this->multiline;
    }
    
    /**
     * Sets whether the user response should accept newline characters.
     *
     * @return $this
     */
    public function setMultiline(bool $multiline) : static {
        $this->multiline = $multiline;
        return $this;
    }
    
    /**
     * Returns whether the user response must be hidden.
     */
    public function isHidden() : bool {
        return $this->hidden;
    }
    
    /**
     * Sets whether the user response must be hidden or not.
     *
     * @return $this
     *
     * @throws LogicException In case the autocompleter is also used
     */
    public function setHidden(bool $hidden) : static {
        if ($this->autocompleterCallback) {
            throw new LogicException('A hidden question cannot use the autocompleter.');
        }
        $this->hidden = $hidden;
        return $this;
    }
    
    /**
     * In case the response cannot be hidden, whether to fallback on non-hidden question or not.
     */
    public function isHiddenFallback() : bool {
        return $this->hiddenFallback;
    }
    
    /**
     * Sets whether to fallback on non-hidden question if the response cannot be hidden.
     *
     * @return $this
     */
    public function setHiddenFallback(bool $fallback) : static {
        $this->hiddenFallback = $fallback;
        return $this;
    }
    
    /**
     * Gets values for the autocompleter.
     */
    public function getAutocompleterValues() : ?iterable {
        $callback = $this->getAutocompleterCallback();
        return $callback ? $callback('') : null;
    }
    
    /**
     * Sets values for the autocompleter.
     *
     * @return $this
     *
     * @throws LogicException
     */
    public function setAutocompleterValues(?iterable $values) : static {
        if (\is_array($values)) {
            $values = $this->isAssoc($values) ? array_merge(array_keys($values), array_values($values)) : array_values($values);
            $callback = static fn() => $values;
        }
        elseif ($values instanceof \Traversable) {
            $callback = static function () use ($values) {
                static $valueCache;
                return $valueCache ??= iterator_to_array($values, false);
            };
        }
        else {
            $callback = null;
        }
        return $this->setAutocompleterCallback($callback);
    }
    
    /**
     * Gets the callback function used for the autocompleter.
     */
    public function getAutocompleterCallback() : ?callable {
        return $this->autocompleterCallback;
    }
    
    /**
     * Sets the callback function used for the autocompleter.
     *
     * The callback is passed the user input as argument and should return an iterable of corresponding suggestions.
     *
     * @return $this
     */
    public function setAutocompleterCallback(?callable $callback) : static {
        if ($this->hidden && null !== $callback) {
            throw new LogicException('A hidden question cannot use the autocompleter.');
        }
        $this->autocompleterCallback = null === $callback ? null : $callback(...);
        return $this;
    }
    
    /**
     * Sets a validator for the question.
     *
     * @return $this
     */
    public function setValidator(?callable $validator) : static {
        $this->validator = null === $validator ? null : $validator(...);
        return $this;
    }
    
    /**
     * Gets the validator for the question.
     */
    public function getValidator() : ?callable {
        return $this->validator;
    }
    
    /**
     * Sets the maximum number of attempts.
     *
     * Null means an unlimited number of attempts.
     *
     * @return $this
     *
     * @throws InvalidArgumentException in case the number of attempts is invalid
     */
    public function setMaxAttempts(?int $attempts) : static {
        if (null !== $attempts && $attempts < 1) {
            throw new InvalidArgumentException('Maximum number of attempts must be a positive value.');
        }
        $this->attempts = $attempts;
        return $this;
    }
    
    /**
     * Gets the maximum number of attempts.
     *
     * Null means an unlimited number of attempts.
     */
    public function getMaxAttempts() : ?int {
        return $this->attempts;
    }
    
    /**
     * Sets a normalizer for the response.
     *
     * The normalizer can be a callable (a string), a closure or a class implementing __invoke.
     *
     * @return $this
     */
    public function setNormalizer(callable $normalizer) : static {
        $this->normalizer = $normalizer(...);
        return $this;
    }
    
    /**
     * Gets the normalizer for the response.
     *
     * The normalizer can ba a callable (a string), a closure or a class implementing __invoke.
     */
    public function getNormalizer() : ?callable {
        return $this->normalizer;
    }
    protected function isAssoc(array $array) : bool {
        return (bool) \count(array_filter(array_keys($array), 'is_string'));
    }
    public function isTrimmable() : bool {
        return $this->trimmable;
    }
    
    /**
     * @return $this
     */
    public function setTrimmable(bool $trimmable) : static {
        $this->trimmable = $trimmable;
        return $this;
    }

}