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<?php
/*
 * This file is part of 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;

class Factory
{
    /**
     * @param array|string $paths
     * @param array|string $suffixes
     * @param array|string $prefixes
     * @param array        $exclude
     *
     * @return \AppendIterator
     */
    public function getFileIterator($paths, $suffixes = '', $prefixes = '', array $exclude = []): \AppendIterator
    {
        if (\is_string($paths)) {
            $paths = [$paths];
        }

$paths   = $this->getPathsAfterResolvingWildcards($paths);
        $exclude = $this->getPathsAfterResolvingWildcards($exclude);

if (\is_string($prefixes)) {
            if ($prefixes !== '') {
                $prefixes = [$prefixes];
            } else {
                $prefixes = [];
            }
        }

if (\is_string($suffixes)) {
            if ($suffixes !== '') {
                $suffixes = [$suffixes];
            } else {
                $suffixes = [];
            }
        }

$iterator = new \AppendIterator;

foreach ($paths as $path) {
            if (\is_dir($path)) {
                $iterator->append(
                    new Iterator(
                        $path,
                        new \RecursiveIteratorIterator(
                            new \RecursiveDirectoryIterator($path, \RecursiveDirectoryIterator::FOLLOW_SYMLINKS | \RecursiveDirectoryIterator::SKIP_DOTS)
                        ),
                        $suffixes,
                        $prefixes,
                        $exclude
                    )
                );
            }
        }

return $iterator;
    }

protected function getPathsAfterResolvingWildcards(array $paths): array
    {
        $_paths = [[]];

foreach ($paths as $path) {
            if ($locals = \glob($path, GLOB_ONLYDIR)) {
                $_paths[] = \array_map('\realpath', $locals);
            } else {
                $_paths[] = [\realpath($path)];
            }
        }

return \array_filter(\array_merge(...$_paths));
    }
}