<?php

declare (strict_types=1);
/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2018-2020 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */
namespace RSSProVendor\CBOR;

use InvalidArgumentException;
use RuntimeException;
final class StringStream implements Stream
{
    /**
     * @var resource
     */
    private $resource;
    public function __construct(string $data)
    {
        $resource = fopen('php://memory', 'rb+');
        if ($resource === \false) {
            throw new RuntimeException('Unable to open the memory');
        }
        $result = fwrite($resource, $data);
        if ($result === \false) {
            throw new RuntimeException('Unable to write the memory');
        }
        $result = rewind($resource);
        if ($result === \false) {
            throw new RuntimeException('Unable to rewind the memory');
        }
        $this->resource = $resource;
    }
    public static function create(string $data): self
    {
        return new self($data);
    }
    public function read(int $length): string
    {
        if ($length === 0) {
            return '';
        }
        $alreadyRead = 0;
        $data = '';
        while ($alreadyRead < $length) {
            $left = $length - $alreadyRead;
            $sizeToRead = $left < 1024 && $left > 0 ? $left : 1024;
            $newData = fread($this->resource, $sizeToRead);
            $alreadyRead += $sizeToRead;
            if ($newData === \false) {
                throw new RuntimeException('Unable to read the memory');
            }
            if (mb_strlen($newData, '8bit') < $sizeToRead) {
                throw new InvalidArgumentException(sprintf('Out of range. Expected: %d, read: %d.', $length, mb_strlen($data, '8bit')));
            }
            $data .= $newData;
        }
        if (mb_strlen($data, '8bit') !== $length) {
            throw new InvalidArgumentException(sprintf('Out of range. Expected: %d, read: %d.', $length, mb_strlen($data, '8bit')));
        }
        return $data;
    }
}
