class Input

abstract class Input implements InputInterface, StreamableInputInterface {
    protected InputDefinition $definition;
    
    /** @var resource */
    protected $stream;
    protected array $options = [];
    protected array $arguments = [];
    protected bool $interactive = true;
    public function __construct(?InputDefinition $definition = null) {
        if (null === $definition) {
            $this->definition = new InputDefinition();
        }
        else {
            $this->bind($definition);
            $this->validate();
        }
    }
    public function bind(InputDefinition $definition) : void {
        $this->arguments = [];
        $this->options = [];
        $this->definition = $definition;
        $this->parse();
    }
    
    /**
     * Processes command line arguments.
     */
    protected abstract function parse() : void;
    public function validate() : void {
        $definition = $this->definition;
        $givenArguments = $this->arguments;
        $missingArguments = array_filter(array_keys($definition->getArguments()), fn($argument) => !\array_key_exists($argument, $givenArguments) && $definition->getArgument($argument)
            ->isRequired());
        if (\count($missingArguments) > 0) {
            throw new RuntimeException(\sprintf('Not enough arguments (missing: "%s").', implode(', ', $missingArguments)));
        }
    }
    public function isInteractive() : bool {
        return $this->interactive;
    }
    public function setInteractive(bool $interactive) : void {
        $this->interactive = $interactive;
    }
    public function getArguments() : array {
        return array_merge($this->definition
            ->getArgumentDefaults(), $this->arguments);
    }
    public function getArgument(string $name) : mixed {
        if (!$this->definition
            ->hasArgument($name)) {
            throw new InvalidArgumentException(\sprintf('The "%s" argument does not exist.', $name));
        }
        return $this->arguments[$name] ?? $this->definition
            ->getArgument($name)
            ->getDefault();
    }
    public function setArgument(string $name, mixed $value) : void {
        if (!$this->definition
            ->hasArgument($name)) {
            throw new InvalidArgumentException(\sprintf('The "%s" argument does not exist.', $name));
        }
        $this->arguments[$name] = $value;
    }
    public function hasArgument(string $name) : bool {
        return $this->definition
            ->hasArgument($name);
    }
    public function getOptions() : array {
        return array_merge($this->definition
            ->getOptionDefaults(), $this->options);
    }
    public function getOption(string $name) : mixed {
        if ($this->definition
            ->hasNegation($name)) {
            if (null === ($value = $this->getOption($this->definition
                ->negationToName($name)))) {
                return $value;
            }
            return !$value;
        }
        if (!$this->definition
            ->hasOption($name)) {
            throw new InvalidArgumentException(\sprintf('The "%s" option does not exist.', $name));
        }
        return \array_key_exists($name, $this->options) ? $this->options[$name] : $this->definition
            ->getOption($name)
            ->getDefault();
    }
    public function setOption(string $name, mixed $value) : void {
        if ($this->definition
            ->hasNegation($name)) {
            $this->options[$this->definition
                ->negationToName($name)] = !$value;
            return;
        }
        elseif (!$this->definition
            ->hasOption($name)) {
            throw new InvalidArgumentException(\sprintf('The "%s" option does not exist.', $name));
        }
        $this->options[$name] = $value;
    }
    public function hasOption(string $name) : bool {
        return $this->definition
            ->hasOption($name) || $this->definition
            ->hasNegation($name);
    }
    
    /**
     * Escapes a token through escapeshellarg if it contains unsafe chars.
     */
    public function escapeToken(string $token) : string {
        return preg_match('{^[\\w-]+$}', $token) ? $token : escapeshellarg($token);
    }
    
    /**
     * @param resource $stream
     */
    public function setStream($stream) : void {
        $this->stream = $stream;
    }
    
    /**
     * @return resource
     */
    public function getStream() {
        return $this->stream;
    }

}