<?php
declare(strict_types=1);

require_once "../vendor/autoload.php";

use GetOpt\GetOpt;
use GetOpt\Option;
use GetOpt\Command;
use GetOpt\ArgumentException;
use GetOpt\ArgumentException\Missing;

define('NAME', 'AwesomeApp');
define('VERSION', '1.0-alpha');

class CopyCommand extends Command
{
    public function __construct()
    {
        parent::__construct('copy', [$this, 'handle']);
        
        $option = new \GetOpt\Option('a', 'aaa', \GetOpt\GetOpt::OPTIONAL_ARGUMENT);
        $option->setDescription('Description for optional argument');
        $option->setDefaultValue('must this be numeric ?');  // this resuls in a warning
        $option->setDefaultValue(6);                       // this works fine
        $this->addOption($option);
    }
    
    public function handle(GetOpt $getOpt)
    {
        echo $getOpt->getOption('aaa');
    } 
}

$getOpt = new GetOpt();
$getOpt->addCommand(new CopyCommand());

// process arguments and catch user errors
try {
    try {
        $getOpt->process();
    } catch (Missing $exception) {
        // catch missing exceptions if help is requested
        if (!$getOpt->getOption('help')) {
            throw $exception;
        }
    }
} catch (ArgumentException $exception) {
    echo 'error';
    exit;
}

$command = $getOpt->getCommand();
call_user_func($command->getHandler(), $getOpt);