<?php

namespace Mpdf\PsrHttpMessageShim;

/**
 * @link nyholm/psr7
 */
class Stream implements \Psr\Http\Message\StreamInterface
{
    /**
     * A resource reference.
     *
     * @var resource
     */
    private $stream;
    /**
     * @var bool
     */
    private $seekable;
    /**
     * @var bool
     */
    private $readable;
    /**
     * @var bool
     */
    private $writable;
    /**
     * @var array|mixed|null|void
     */
    private $uri;
    /**
     * @var int
     */
    private $size;
    /** @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]];
    private function __construct()
    {
    }
    /**
     * @param resource $resource
     *
     * @return Stream
     */
    public static function createFromResource($resource)
    {
        if (!\is_resource($resource)) {
            throw new \InvalidArgumentException('Stream must be a resource');
        }
        $obj = new self();
        $obj->stream = $resource;
        $meta = \stream_get_meta_data($obj->stream);
        $obj->seekable = $meta['seekable'];
        $obj->readable = isset(self::$readWriteHash['read'][$meta['mode']]);
        $obj->writable = isset(self::$readWriteHash['write'][$meta['mode']]);
        $obj->uri = $obj->getMetadata('uri');
        return $obj;
    }
    /**
     * @param string $content
     *
     * @return Stream
     */
    public static function create($content)
    {
        $resource = \fopen('php://temp', 'rwb+');
        $stream = self::createFromResource($resource);
        $stream->write($content);
        $stream->seek(0);
        return $stream;
    }
    /**
     * 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 $e) {
            return '';
        }
    }
    public function close()
    {
        if (isset($this->stream)) {
            if (\is_resource($this->stream)) {
                \fclose($this->stream);
            }
            $this->detach();
        }
    }
    public function detach()
    {
        if (!isset($this->stream)) {
            return;
        }
        $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;
        }
        // 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;
        }
    }
    public function tell()
    {
        $result = \ftell($this->stream);
        if ($result === \false) {
            throw new \RuntimeException('Unable to determine stream position');
        }
        return $result;
    }
    public function eof()
    {
        return !$this->stream || \feof($this->stream);
    }
    public function isSeekable()
    {
        return $this->seekable;
    }
    public function seek($offset, $whence = \SEEK_SET)
    {
        if (!$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 rewind()
    {
        $this->seek(0);
    }
    public function isWritable()
    {
        return $this->writable;
    }
    public function write($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 isReadable()
    {
        return $this->readable;
    }
    public function read($length)
    {
        if (!$this->readable) {
            throw new \RuntimeException('Cannot read from non-readable stream');
        }
        return \fread($this->stream, $length);
    }
    public function getContents()
    {
        if (!isset($this->stream)) {
            throw new \RuntimeException('Unable to read stream contents');
        }
        $contents = \stream_get_contents($this->stream);
        if ($contents === \false) {
            throw new \RuntimeException('Unable to read stream contents');
        }
        return $contents;
    }
    public function getMetadata($key = null)
    {
        if (!isset($this->stream)) {
            return $key ? null : [];
        }
        if ($key === null) {
            return \stream_get_meta_data($this->stream);
        }
        $meta = \stream_get_meta_data($this->stream);
        return isset($meta[$key]) ? $meta[$key] : null;
    }
}
