class InputOption

class InputOption {
    
    /**
     * Do not accept input for the option (e.g. --yell). This is the default behavior of options.
     */
    public const VALUE_NONE = 1;
    
    /**
     * A value must be passed when the option is used (e.g. --iterations=5 or -i5).
     */
    public const VALUE_REQUIRED = 2;
    
    /**
     * The option may or may not have a value (e.g. --yell or --yell=loud).
     */
    public const VALUE_OPTIONAL = 4;
    
    /**
     * The option accepts multiple values (e.g. --dir=/foo --dir=/bar).
     */
    public const VALUE_IS_ARRAY = 8;
    
    /**
     * The option allows passing a negated variant (e.g. --ansi or --no-ansi).
     */
    public const VALUE_NEGATABLE = 16;
    private string $name;
    private ?string $shortcut;
    private int $mode;
    private string|int|bool|array|float|null $default;
    
    /**
     * @param string|array|null                                                             $shortcut        The shortcuts, can be null, a string of shortcuts delimited by | or an array of shortcuts
     * @param int-mask-of<InputOption::*>|null                                              $mode            The option mode: One of the VALUE_* constants
     * @param string|bool|int|float|array|null                                              $default         The default value (must be null for self::VALUE_NONE)
     * @param array|\Closure(CompletionInput,CompletionSuggestions):list<string|Suggestion> $suggestedValues The values used for input completion
     *
     * @throws InvalidArgumentException If option mode is invalid or incompatible
     */
    public function __construct(string $name, string|array|null $shortcut = null, ?int $mode = null, string $description = '', string|bool|int|float|array|null $default = null, array|\Closure $suggestedValues = []) {
        if (str_starts_with($name, '--')) {
            $name = substr($name, 2);
        }
        if (!$name) {
            throw new InvalidArgumentException('An option name cannot be empty.');
        }
        if ('' === $shortcut || [] === $shortcut || false === $shortcut) {
            $shortcut = null;
        }
        if (null !== $shortcut) {
            if (\is_array($shortcut)) {
                $shortcut = implode('|', $shortcut);
            }
            $shortcuts = preg_split('{(\\|)-?}', ltrim($shortcut, '-'));
            $shortcuts = array_filter($shortcuts, 'strlen');
            $shortcut = implode('|', $shortcuts);
            if ('' === $shortcut) {
                throw new InvalidArgumentException('An option shortcut cannot be empty.');
            }
        }
        if (null === $mode) {
            $mode = self::VALUE_NONE;
        }
        elseif ($mode >= self::VALUE_NEGATABLE << 1 || $mode < 1) {
            throw new InvalidArgumentException(\sprintf('Option mode "%s" is not valid.', $mode));
        }
        $this->name = $name;
        $this->shortcut = $shortcut;
        $this->mode = $mode;
        if ($suggestedValues && !$this->acceptValue()) {
            throw new LogicException('Cannot set suggested values if the option does not accept a value.');
        }
        if ($this->isArray() && !$this->acceptValue()) {
            throw new InvalidArgumentException('Impossible to have an option mode VALUE_IS_ARRAY if the option does not accept a value.');
        }
        if ($this->isNegatable() && $this->acceptValue()) {
            throw new InvalidArgumentException('Impossible to have an option mode VALUE_NEGATABLE if the option also accepts a value.');
        }
        $this->setDefault($default);
    }
    
    /**
     * Returns the option shortcut.
     */
    public function getShortcut() : ?string {
        return $this->shortcut;
    }
    
    /**
     * Returns the option name.
     */
    public function getName() : string {
        return $this->name;
    }
    
    /**
     * Returns true if the option accepts a value.
     *
     * @return bool true if value mode is not self::VALUE_NONE, false otherwise
     */
    public function acceptValue() : bool {
        return $this->isValueRequired() || $this->isValueOptional();
    }
    
    /**
     * Returns true if the option requires a value.
     *
     * @return bool true if value mode is self::VALUE_REQUIRED, false otherwise
     */
    public function isValueRequired() : bool {
        return self::VALUE_REQUIRED === (self::VALUE_REQUIRED & $this->mode);
    }
    
    /**
     * Returns true if the option takes an optional value.
     *
     * @return bool true if value mode is self::VALUE_OPTIONAL, false otherwise
     */
    public function isValueOptional() : bool {
        return self::VALUE_OPTIONAL === (self::VALUE_OPTIONAL & $this->mode);
    }
    
    /**
     * Returns true if the option can take multiple values.
     *
     * @return bool true if mode is self::VALUE_IS_ARRAY, false otherwise
     */
    public function isArray() : bool {
        return self::VALUE_IS_ARRAY === (self::VALUE_IS_ARRAY & $this->mode);
    }
    
    /**
     * Returns true if the option allows passing a negated variant.
     *
     * @return bool true if mode is self::VALUE_NEGATABLE, false otherwise
     */
    public function isNegatable() : bool {
        return self::VALUE_NEGATABLE === (self::VALUE_NEGATABLE & $this->mode);
    }
    
    /**
     * Sets the default value.
     */
    public function setDefault(string|bool|int|float|array|null $default) : void {
        if (self::VALUE_NONE === (self::VALUE_NONE & $this->mode) && null !== $default) {
            throw new LogicException('Cannot set a default value when using InputOption::VALUE_NONE mode.');
        }
        if ($this->isArray()) {
            if (null === $default) {
                $default = [];
            }
            elseif (!\is_array($default)) {
                throw new LogicException('A default value for an array option must be an array.');
            }
        }
        $this->default = $this->acceptValue() || $this->isNegatable() ? $default : false;
    }
    
    /**
     * Returns the default value.
     */
    public function getDefault() : string|bool|int|float|array|null {
        return $this->default;
    }
    
    /**
     * Returns the description text.
     */
    public function getDescription() : string {
        return $this->description;
    }
    
    /**
     * Returns true if the option has values for input completion.
     */
    public function hasCompletion() : bool {
        return [] !== $this->suggestedValues;
    }
    
    /**
     * Supplies suggestions when command resolves possible completion options for input.
     *
     * @see Command::complete()
     */
    public function complete(CompletionInput $input, CompletionSuggestions $suggestions) : void {
        $values = $this->suggestedValues;
        if ($values instanceof \Closure && !\is_array($values = $values($input))) {
            throw new LogicException(\sprintf('Closure for option "%s" must return an array. Got "%s".', $this->name, get_debug_type($values)));
        }
        if ($values) {
            $suggestions->suggestValues($values);
        }
    }
    
    /**
     * Checks whether the given option equals this one.
     */
    public function equals(self $option) : bool {
        return $option->getName() === $this->getName() && $option->getShortcut() === $this->getShortcut() && $option->getDefault() === $this->getDefault() && $option->isNegatable() === $this->isNegatable() && $option->isArray() === $this->isArray() && $option->isValueRequired() === $this->isValueRequired() && $option->isValueOptional() === $this->isValueOptional();
    }

}