<?php

/**
 * Stream wrapper `glob://` to use rich syntax in `GlobIterator`.
 */
class GlobStreamWrapper
{
    /**
     * @var string
     */
    protected const PROTOCOL = 'glob';

    /**
     * @var Generator|null
     */
    protected ?Generator $generator;

    public static function register(): bool
    {
        return \stream_wrapper_unregister(self::PROTOCOL) && \stream_wrapper_register(self::PROTOCOL, self::class);
    }

    public static function unregister(): bool
    {
        return \stream_wrapper_unregister(self::PROTOCOL) && \stream_wrapper_restore(self::PROTOCOL);
    }
    
    protected function createGenerator(array $paths): \Generator
    {
        return yield from $paths;
    }

    public function openDir(string $pattern, int $options = 0): bool
    {
        $pattern = \str_replace(self::PROTOCOL . '://', '', $pattern);
        $pattern = \str_replace(['\\', '/'], \DIRECTORY_SEPARATOR, $pattern);
        $options |= \GLOB_BRACE | \GLOB_NOSORT;
        $paths = \glob($pattern, $options) ?: [];
        $this->generator = $this->createGenerator($paths);

        return $this->generator->valid();
    }

    /**
     * @return string|false
     */
    public function readDir()
    {
        if ($this->generator !== null && $this->generator->valid()) {
            $path = $this->generator->current();
            $this->generator->next();
            return $path;
        }

        return false;
    }

    public function rewindDir(): bool
    {
        if ($this->generator === null) {
            return false;
        }
        $this->generator->rewind();

        return $this->generator->valid();
    }

    public function closeDir(): bool
    {
        $this->generator = null;

        return true;
    }

    /**
     * @return mixed
     * @throws \BadMethodCallException Call undefined method
     */
    public function __call(string $method, array $arguments)
    {
        $aliases = [
            'dir_opendir' => 'openDir',
            'dir_readdir' => 'readDir',
            'dir_rewinddir' => 'rewindDir',
            'dir_closedir' => 'closeDir',
        ];
        if (!isset($aliases[$method])) {
            throw new \BadMethodCallException('Call undefined method: ' . $method);
        }

        return $this->{$aliases[$method]}(...$arguments);
    }
}