<?php
declare(strict_types=1);

namespace IOcornerstone\Framework\Http;

use Psr\Http\Message\StreamInterface;

final class Stream implements StreamInterface
{
    private $resource;

    public function __construct($resource)
    {
        $this->resource = $resource;
    }

    public static function fromString(string $content): self
    {
        $r = fopen('php://temp', 'r+');
        fwrite($r, $content);
        rewind($r);
        return new self($r);
    }

    public function __toString(): string
    {
        if (!$this->resource) {
            return '';
        }

        $pos = ftell($this->resource);
        rewind($this->resource);
        $contents = stream_get_contents($this->resource);
        fseek($this->resource, $pos);

        return $contents ?: '';
    }

    public function close(): void { fclose($this->resource); }
    public function detach() { $r = $this->resource; $this->resource = null; return $r; }
    public function getSize(): ?int { return null; }
    public function tell(): int { return ftell($this->resource); }
    public function eof(): bool { return feof($this->resource); }
    public function isSeekable(): bool { return true; }
    public function seek($offset, $whence = SEEK_SET): void { fseek($this->resource, $offset, $whence); }
    public function rewind(): void { rewind($this->resource); }
    public function isWritable(): bool { return true; }
    public function write($string): int { return fwrite($this->resource, $string); }
    public function isReadable(): bool { return true; }
    public function read($length): string { return fread($this->resource, $length); }
    public function getContents(): string { return stream_get_contents($this->resource); }
    public function getMetadata($key = null) { return null; }
}