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<?php
namespace Gek\FileFinder\Iterators;
use Gek\FileFinder\FileInfo;
use RecursiveDirectoryIterator;
class GekRecursiveDirectoryIterator extends RecursiveDirectoryIterator
{
    /**
     * @var bool
     */
    private $ignoreUnreadableDirs;
    /**
     * @var bool
     */
    private $rewindable;
    // these 3 properties take part of the performance optimization to avoid redoing the same work in all iterations
    private $rootPath;
    private $subPath;
    private $directorySeparator = '/';
    /**
     * GekRecursiveDirectoryIterator constructor.
     * @param string $path
     * @param int $flags
     * @param bool $ignoreUnreadableDirs
     */
    public function __construct(string $path, int $flags, bool $ignoreUnreadableDirs = false)
    {
        if ($flags & (self::CURRENT_AS_PATHNAME | self::CURRENT_AS_SELF)) {
            throw new \RuntimeException('This iterator only support returning current as fileinfo.');
        }
        parent::__construct($path, $flags);
        $this->ignoreUnreadableDirs = $ignoreUnreadableDirs;
        $this->rootPath = $path;
        if ('/' !== \DIRECTORY_SEPARATOR && !($flags & self::UNIX_PATHS)) {
            $this->directorySeparator = \DIRECTORY_SEPARATOR;
        }
    }
    /**
     * @return FileInfo
     */
    public function current()
    {
        // the logic here avoids redoing the same work in all iterations
        if (null === $subPathname = $this->subPath) {
            $subPathname = $this->subPath = (string) $this->getSubPath();
        }
        if ('' !== $subPathname) {
            $subPathname .= $this->directorySeparator;
        }
        $subPathname .= $this->getFilename();
        if ('/' !== $basePath = $this->rootPath) {
            $basePath .= $this->directorySeparator;
        }
        return new FileInfo($basePath.$subPathname, $this->subPath, $subPathname);
    }
    public function getChildren()
    {
        try {
            $children = parent::getChildren();
            if ($children instanceof self) {
                // parent method will call the constructor with default arguments, so unreadable dirs won't be ignored anymore
                $children->ignoreUnreadableDirs = $this->ignoreUnreadableDirs;
                // performance optimization to avoid redoing the same work in all children
                $children->rewindable = &$this->rewindable;
                $children->rootPath = $this->rootPath;
            }
            return $children;
        } catch (\UnexpectedValueException $e) {
            if ($this->ignoreUnreadableDirs) {
                // If directory is unreadable and finder is set to ignore it, a fake empty content is returned.
                return new \RecursiveArrayIterator([]);
            } else {
                throw new \UnexpectedValueException($e->getMessage(), $e->getCode(), $e);
            }
        }
    }
    /**
     * @return bool
     */
    public function isIgnoreUnreadableDirs(): bool
    {
        return $this->ignoreUnreadableDirs;
    }
    /**
     * @param bool $ignoreUnreadableDirs
     */
    public function setIgnoreUnreadableDirs(bool $ignoreUnreadableDirs): void
    {
        $this->ignoreUnreadableDirs = $ignoreUnreadableDirs;
    }
    /**
     * Do nothing for non rewindable stream.
     */
    public function rewind()
    {
        if (false === $this->isRewindable()) {
            return;
        }
        parent::rewind();
    }
    /**
     * Checks if the stream is rewindable.
     *
     * @return bool true when the stream is rewindable, false otherwise
     */
    public function isRewindable()
    {
        if (null !== $this->rewindable) {
            return $this->rewindable;
        }
        if (false !== $stream = @opendir($this->getPath())) {
            $infos = stream_get_meta_data($stream);
            closedir($stream);
            if ($infos['seekable']) {
                return $this->rewindable = true;
            }
        }
        return $this->rewindable = false;
    }
}