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<?php declare(strict_types=1);
/*
 * This file is part of phpunit/php-file-iterator.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\FileIterator;

use const DIRECTORY_SEPARATOR;
use function array_unique;
use function count;
use function dirname;
use function explode;
use function is_file;
use function is_string;
use function realpath;
use function sort;

class Facade
{
    /**
     * @param array|string $paths
     * @param array|string $suffixes
     * @param array|string $prefixes
     */
    public function getFilesAsArray($paths, $suffixes = '', $prefixes = '', array $exclude = [], bool $commonPath = false): array
    {
        if (is_string($paths)) {
            $paths = [$paths];
        }

$iterator = (new Factory)->getFileIterator($paths, $suffixes, $prefixes, $exclude);

$files = [];

foreach ($iterator as $file) {
            $file = $file->getRealPath();

if ($file) {
                $files[] = $file;
            }
        }

foreach ($paths as $path) {
            if (is_file($path)) {
                $files[] = realpath($path);
            }
        }

$files = array_unique($files);
        sort($files);

if ($commonPath) {
            return [
                'commonPath' => $this->getCommonPath($files),
                'files'      => $files,
            ];
        }

return $files;
    }

protected function getCommonPath(array $files): string
    {
        $count = count($files);

if ($count === 0) {
            return '';
        }

if ($count === 1) {
            return dirname($files[0]) . DIRECTORY_SEPARATOR;
        }

$_files = [];

foreach ($files as $file) {
            $_files[] = $_fileParts = explode(DIRECTORY_SEPARATOR, $file);

if (empty($_fileParts[0])) {
                $_fileParts[0] = DIRECTORY_SEPARATOR;
            }
        }

$common = '';
        $done   = false;
        $j      = 0;
        $count--;

while (!$done) {
            for ($i = 0; $i < $count; $i++) {
                if ($_files[$i][$j] != $_files[$i + 1][$j]) {
                    $done = true;

break;
                }
            }

if (!$done) {
                $common .= $_files[0][$j];

if ($j > 0) {
                    $common .= DIRECTORY_SEPARATOR;
                }
            }

$j++;
        }

return DIRECTORY_SEPARATOR . $common;
    }
}