<?php

/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace Symfony\Component\Console\Input;

use Symfony\Component\Console\Exception\InvalidArgumentException;
use Symfony\Component\Console\Exception\LogicException;

/**
* Represents a command line argument.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class InputArgument
{
public const REQUIRED = 1;
public const OPTIONAL = 2;
public const IS_ARRAY = 4;

private $name;
private $mode;
private $default;
private $description;

/**
* @param string $name The argument name
* @param int|null $mode The argument mode: self::REQUIRED or self::OPTIONAL
* @param string $description A description text
* @param string|bool|int|float|array|null $default The default value (for self::OPTIONAL mode only)
*
* @throws InvalidArgumentException When argument mode is not valid
*/
public function __construct(string $name, int $mode = null, string $description = '', $default = null)
{
if (null === $mode) {
$mode = self::OPTIONAL;
} elseif ($mode > 7 || $mode < 1) {
throw new InvalidArgumentException(sprintf('Argument mode "%s" is not valid.', $mode));
}

$this->name = $name;
$this->mode = $mode;
$this->description = $description;

$this->setDefault($default);
}

/**
* Returns the argument name.
*
* @return string The argument name
*/
public function getName()
{
return $this->name;
}

/**
* Returns true if the argument is required.
*
* @return bool true if parameter mode is self::REQUIRED, false otherwise
*/
public function isRequired()
{
return self::REQUIRED === (self::REQUIRED & $this->mode);
}

/**
* Returns true if the argument can take multiple values.
*
* @return bool true if mode is self::IS_ARRAY, false otherwise
*/
public function isArray()
{
return self::IS_ARRAY === (self::IS_ARRAY & $this->mode);
}

/**
* Sets the default value.
*
* @param string|bool|int|float|array|null $default
*
* @throws LogicException When incorrect default value is given
*/
public function setDefault($default = null)
{
if ($this->isRequired() && null !== $default) {
throw new LogicException('Cannot set a default value except for InputArgument::OPTIONAL mode.');
}

if ($this->isArray()) {
if (null === $default) {
$default = [];
} elseif (!\is_array($default)) {
throw new LogicException('A default value for an array argument must be an array.');
}
}

$this->default = $default;
}

/**
* Returns the default value.
*
* @return string|bool|int|float|array|null
*/
public function getDefault()
{
return $this->default;
}

/**
* Returns the description text.
*
* @return string The description text
*/
public function getDescription()
{
return $this->description;
}
}