class ConsoleInputCollector

final class ConsoleInputCollector implements InputCollectorInterface {
    
    /**
     * The name of the command-line option for passing input values.
     *
     * @var string
     */
    public const INPUT_OPTION = 'input';
    public function __construct(InputInterface $input, StyleInterface $io) {
    }
    
    /**
     * Configures a console command to support the `--input` option.
     *
     * This should be called by a command's configure() method.
     *
     * @param \Symfony\Component\Console\Command\Command $command
     *   The command being configured.
     */
    public static function configureCommand(Command $command) : void {
        $command->addOption(static::INPUT_OPTION, 'i', InputOption::VALUE_IS_ARRAY | InputOption::VALUE_REQUIRED, sprintf('An input value to pass to the recipe or one of its dependencies, in the form `--%s=RECIPE_NAME.INPUT_NAME=VALUE`.', static::INPUT_OPTION), []);
    }
    
    /**
     * Returns the `--input` options passed to the command.
     *
     * @return string[]
     *   The values from the `--input` options passed to the command, keyed by
     *   fully qualified name (i.e., prefixed with the name of their defining
     *   recipe).
     */
    private function getInputFromOptions() : array {
        $options = [];
        try {
            foreach ($this->input
                ->getOption(static::INPUT_OPTION) ?? [] as $option) {
                [
                    $key,
                    $value,
                ] = explode('=', $option, 2);
                $options[$key] = $value;
            }
        } catch (InvalidArgumentException) {
            // The option is undefined; there's nothing we need to do.
        }
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function collectValue(string $name, DataDefinitionInterface $definition, mixed $default_value) : mixed {
        $option_values = $this->getInputFromOptions();
        // If the value was passed as a `--input` option, return that.
        if (array_key_exists($name, $option_values)) {
            return $option_values[$name];
        }
        
        /** @var array{method: string, arguments?: array<mixed>}|null $settings */
        $settings = $definition->getSetting('prompt');
        // If there's no information on how to prompt the user, there's nothing else
        // for us to do; return the default value.
        if (empty($settings)) {
            return $default_value;
        }
        $method = $settings['method'];
        $arguments = $settings['arguments'] ?? [];
        // Most of the input-collecting methods of StyleInterface have a `default`
        // parameter.
        $arguments += [
            'default' => $default_value,
        ];
        // We don't support using Symfony Console's inline validation; instead,
        // input definitions should define constraints.
        unset($arguments['validator']);
        return $this->io
            ->{$method}(...$arguments);
    }

}