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<?php

namespace GuzzleHttp\Psr7;

use
Psr\Http\Message\StreamInterface;

/**
 * PHP stream implementation.
 *
 * @var $stream
 */
class Stream implements StreamInterface
{
   
/**
     * Resource modes.
     *
     * @var string
     *
     * @see http://php.net/manual/function.fopen.php
     * @see http://php.net/manual/en/function.gzopen.php
     */
   
const READABLE_MODES = '/r|a\+|ab\+|w\+|wb\+|x\+|xb\+|c\+|cb\+/';
    const
WRITABLE_MODES = '/a|w|r\+|rb\+|rw|x|c/';

    private
$stream;
    private
$size;
    private
$seekable;
    private
$readable;
    private
$writable;
    private
$uri;
    private
$customMetadata;

   
/**
     * This constructor accepts an associative array of options.
     *
     * - size: (int) If a read stream would otherwise have an indeterminate
     *   size, but the size is known due to foreknowledge, then you can
     *   provide that size, in bytes.
     * - metadata: (array) Any additional metadata to return when the metadata
     *   of the stream is accessed.
     *
     * @param resource $stream  Stream resource to wrap.
     * @param array    $options Associative array of options.
     *
     * @throws \InvalidArgumentException if the stream is not a stream resource
     */
   
public function __construct($stream, $options = [])
    {
        if (!
is_resource($stream)) {
            throw new \
InvalidArgumentException('Stream must be a resource');
        }

        if (isset(
$options['size'])) {
           
$this->size = $options['size'];
        }

       
$this->customMetadata = isset($options['metadata'])
            ?
$options['metadata']
            : [];

       
$this->stream = $stream;
       
$meta = stream_get_meta_data($this->stream);
       
$this->seekable = $meta['seekable'];
       
$this->readable = (bool)preg_match(self::READABLE_MODES, $meta['mode']);
       
$this->writable = (bool)preg_match(self::WRITABLE_MODES, $meta['mode']);
       
$this->uri = $this->getMetadata('uri');
    }

   
/**
     * Closes the stream when the destructed
     */
   
public function __destruct()
    {
       
$this->close();
    }

    public function
__toString()
    {
        try {
            if (
$this->isSeekable()) {
               
$this->seek(0);
            }
            return
$this->getContents();
        } catch (\
Exception $e) {
            return
'';
        }
    }

    public function
getContents()
    {
        if (!isset(
$this->stream)) {
            throw new \
RuntimeException('Stream is detached');
        }

       
$contents = stream_get_contents($this->stream);

        if (
$contents === false) {
            throw new \
RuntimeException('Unable to read stream contents');
        }

        return
$contents;
    }

    public function
close()
    {
        if (isset(
$this->stream)) {
            if (
is_resource($this->stream)) {
               
fclose($this->stream);
            }
           
$this->detach();
        }
    }

    public function
detach()
    {
        if (!isset(
$this->stream)) {
            return
null;
        }

       
$result = $this->stream;
        unset(
$this->stream);
       
$this->size = $this->uri = null;
       
$this->readable = $this->writable = $this->seekable = false;

        return
$result;
    }

    public function
getSize()
    {
        if (
$this->size !== null) {
            return
$this->size;
        }

        if (!isset(
$this->stream)) {
            return
null;
        }

       
// Clear the stat cache if the stream has a URI
       
if ($this->uri) {
           
clearstatcache(true, $this->uri);
        }

       
$stats = fstat($this->stream);
        if (isset(
$stats['size'])) {
           
$this->size = $stats['size'];
            return
$this->size;
        }

        return
null;
    }

    public function
isReadable()
    {
        return
$this->readable;
    }

    public function
isWritable()
    {
        return
$this->writable;
    }

    public function
isSeekable()
    {
        return
$this->seekable;
    }

    public function
eof()
    {
        if (!isset(
$this->stream)) {
            throw new \
RuntimeException('Stream is detached');
        }

        return
feof($this->stream);
    }

    public function
tell()
    {
        if (!isset(
$this->stream)) {
            throw new \
RuntimeException('Stream is detached');
        }

       
$result = ftell($this->stream);

        if (
$result === false) {
            throw new \
RuntimeException('Unable to determine stream position');
        }

        return
$result;
    }

    public function
rewind()
    {
       
$this->seek(0);
    }

    public function
seek($offset, $whence = SEEK_SET)
    {
       
$whence = (int) $whence;

        if (!isset(
$this->stream)) {
            throw new \
RuntimeException('Stream is detached');
        }
        if (!
$this->seekable) {
            throw new \
RuntimeException('Stream is not seekable');
        }
        if (
fseek($this->stream, $offset, $whence) === -1) {
            throw new \
RuntimeException('Unable to seek to stream position '
               
. $offset . ' with whence ' . var_export($whence, true));
        }
    }

    public function
read($length)
    {
        if (!isset(
$this->stream)) {
            throw new \
RuntimeException('Stream is detached');
        }
        if (!
$this->readable) {
            throw new \
RuntimeException('Cannot read from non-readable stream');
        }
        if (
$length < 0) {
            throw new \
RuntimeException('Length parameter cannot be negative');
        }

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

       
$string = fread($this->stream, $length);
        if (
false === $string) {
            throw new \
RuntimeException('Unable to read from stream');
        }

        return
$string;
    }

    public function
write($string)
    {
        if (!isset(
$this->stream)) {
            throw new \
RuntimeException('Stream is detached');
        }
        if (!
$this->writable) {
            throw new \
RuntimeException('Cannot write to a non-writable stream');
        }

       
// We can't know the size after writing anything
       
$this->size = null;
       
$result = fwrite($this->stream, $string);

        if (
$result === false) {
            throw new \
RuntimeException('Unable to write to stream');
        }

        return
$result;
    }

    public function
getMetadata($key = null)
    {
        if (!isset(
$this->stream)) {
            return
$key ? null : [];
        } elseif (!
$key) {
            return
$this->customMetadata + stream_get_meta_data($this->stream);
        } elseif (isset(
$this->customMetadata[$key])) {
            return
$this->customMetadata[$key];
        }

       
$meta = stream_get_meta_data($this->stream);

        return isset(
$meta[$key]) ? $meta[$key] : null;
    }
}