<?php
namespace GuzzleHttp\Stream;

/**
* Converts Guzzle streams into PHP stream resources.
*/
class GuzzleStreamWrapper
{
/** @var resource */
public $context;

/** @var StreamInterface */
private $stream;

/** @var string r, r+, or w */
private $mode;

/**
* Returns a resource representing the stream.
*
* @param StreamInterface $stream The stream to get a resource for
*
* @return resource
* @throws \InvalidArgumentException if stream is not readable or writable
*/
public static function getResource(StreamInterface $stream)
{
self::register();

if ($stream->isReadable()) {
$mode = $stream->isWritable() ? 'r+' : 'r';
} elseif ($stream->isWritable()) {
$mode = 'w';
} else {
throw new \InvalidArgumentException('The stream must be readable, '
. 'writable, or both.');
}

return fopen('guzzle://stream', $mode, false, stream_context_create([
'guzzle' => ['stream' => $stream],
]));
}

/**
* Registers the stream wrapper if needed
*/
public static function register()
{
if (!in_array('guzzle', stream_get_wrappers())) {
stream_wrapper_register('guzzle', __CLASS__);
}
}

public function stream_open($path, $mode, $options, &$opened_path)
{
$options = stream_context_get_options($this->context);

if (!isset($options['guzzle']['stream'])) {
return false;
}

$this->mode = $mode;
$this->stream = $options['guzzle']['stream'];

return true;
}

public function stream_read($count)
{
return $this->stream->read($count);
}

public function stream_write($data)
{
return (int) $this->stream->write($data);
}

public function stream_tell()
{
return $this->stream->tell();
}

public function stream_eof()
{
return $this->stream->eof();
}

public function stream_seek($offset, $whence)
{
return $this->stream->seek($offset, $whence);
}

public function stream_stat()
{
static $modeMap = [
'r' => 33060,
'r+' => 33206,
'w' => 33188,
];

return [
'dev' => 0,
'ino' => 0,
'mode' => $modeMap[$this->mode],
'nlink' => 0,
'uid' => 0,
'gid' => 0,
'rdev' => 0,
'size' => $this->stream->getSize() ?: 0,
'atime' => 0,
'mtime' => 0,
'ctime' => 0,
'blksize' => 0,
'blocks' => 0
];
}
}