<?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\VarDumper\Caster;

use Symfony\Component\VarDumper\Cloner\Stub;

/**
 * Represents a list of function arguments.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 */
class ArgsStub extends EnumStub
{
	private static $parameters = array();

	public function __construct(array $args, $function, $class)
	{
		list($variadic, $params) = self::getParameters($function, $class);

		$values = array();
		foreach ($args as $k => $v) {
			$values[$k] = !is_scalar($v) && !$v instanceof Stub ? new CutStub($v) : $v;
		}
		if (null === $params) {
			parent::__construct($values, false);

			return;
		}
		if (count($values) < count($params)) {
			$params = array_slice($params, 0, count($values));
		} elseif (count($values) > count($params)) {
			$values[] = new EnumStub(array_splice($values, count($params)), false);
			$params[] = $variadic;
		}
		if (array('...') === $params) {
			$this->dumpKeys = false;
			$this->value = $values[0]->value;
		} else {
			$this->value = array_combine($params, $values);
		}
	}

	private static function getParameters($function, $class)
	{
		if (isset(self::$parameters[$k = $class.'::'.$function])) {
			return self::$parameters[$k];
		}

		try {
			$r = null !== $class ? new \ReflectionMethod($class, $function) : new \ReflectionFunction($function);
		} catch (\ReflectionException $e) {
			return array(null, null);
		}

		$variadic = '...';
		$params = array();
		foreach ($r->getParameters() as $v) {
			$k = '$'.$v->name;
			if ($v->isPassedByReference()) {
				$k = '&'.$k;
			}
			if (method_exists($v, 'isVariadic') && $v->isVariadic()) {
				$variadic .= $k;
			} else {
				$params[] = $k;
			}
		}

		return self::$parameters[$k] = array($variadic, $params);
	}
}
