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<?php

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

/**

 * PHP stream implementation.

 *

 * @var $stream

 */

class Stream implements StreamInterface

{

    private $stream;

    private $size;

    private $seekable;

    private $readable;

    private $writable;

    private $uri;

    private $customMetadata;

    /** @var array Hash of readable and writable stream types */

    private static $readWriteHash = [

        'read' => [

            'r' => true, 'w+' => true, 'r+' => true, 'x+' => true, 'c+' => true,

            'rb' => true, 'w+b' => true, 'r+b' => true, 'x+b' => true,

            'c+b' => true, 'rt' => true, 'w+t' => true, 'r+t' => true,

            'x+t' => true, 'c+t' => true, 'a+' => true

        ],

        'write' => [

            'w' => true, 'w+' => true, 'rw' => true, 'r+' => true, 'x+' => true,

            'c+' => true, 'wb' => true, 'w+b' => true, 'r+b' => true,

            'x+b' => true, 'c+b' => true, 'w+t' => true, 'r+t' => true,

            'x+t' => true, 'c+t' => true, 'a' => true, 'a+' => true

        ]

    ];

    /**

     * 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'];

        $this->readable = isset(self::$readWriteHash['read'][$meta['mode']]);

        $this->writable = isset(self::$readWriteHash['write'][$meta['mode']]);

        $this->uri = $this->getMetadata('uri');

    }

    public function __get($name)

    {

        if ($name == 'stream') {

            throw new \RuntimeException('The stream is detached');

        }

        throw new \BadMethodCallException('No value for ' . $name);

    }

    /**

     * Closes the stream when the destructed

     */

    public function __destruct()

    {

        $this->close();

    }

    public function __toString()

    {

        try {

            $this->seek(0);

            return (string) stream_get_contents($this->stream);

        } catch (\Exception $e) {

            return '';

        }

    }

    public function getContents()

    {

        $contents = stream_get_contents($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()

    {

        return !$this->stream || feof($this->stream);

    }

    public function tell()

    {

        $result = ftell($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)

    {

        if (!$this->seekable) {

            throw new \RuntimeException('Stream is not seekable');

        } elseif (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 (!$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 (!$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;

    }

}