<?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\Config;

use Symfony\Component\Config\Exception\FileLocatorFileNotFoundException;

/**
* FileLocator uses an array of pre-defined paths to find files.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class FileLocator implements FileLocatorInterface
{
protected $paths;

/**
* @param string|string[] $paths A path or an array of paths where to look for resources
*/
public function __construct($paths = [])
{
$this->paths = (array) $paths;
}

/**
* {@inheritdoc}
*/
public function locate($name, $currentPath = null, $first = true)
{
if ('' == $name) {
throw new \InvalidArgumentException('An empty file name is not valid to be located.');
}

if ($this->isAbsolutePath($name)) {
if (!file_exists($name)) {
throw new FileLocatorFileNotFoundException(sprintf('The file "%s" does not exist.', $name), 0, null, [$name]);
}

return $name;
}

$paths = $this->paths;

if (null !== $currentPath) {
array_unshift($paths, $currentPath);
}

$paths = array_unique($paths);
$filepaths = $notfound = [];

foreach ($paths as $path) {
if (@file_exists($file = $path.\DIRECTORY_SEPARATOR.$name)) {
if (true === $first) {
return $file;
}
$filepaths[] = $file;
} else {
$notfound[] = $file;
}
}

if (!$filepaths) {
throw new FileLocatorFileNotFoundException(sprintf('The file "%s" does not exist (in: "%s").', $name, implode('", "', $paths)), 0, null, $notfound);
}

return $filepaths;
}

/**
* Returns whether the file path is an absolute path.
*/
private function isAbsolutePath(string $file): bool
{
if ('/' === $file[0] || '\\' === $file[0]
|| (\strlen($file) > 3 && ctype_alpha($file[0])
&& ':' === $file[1]
&& ('\\' === $file[2] || '/' === $file[2])
)
|| null !== parse_url($file, \PHP_URL_SCHEME)
) {
return true;
}

return false;
}
}