<?php

namespace Amp\Http\Client\Body;

use Amp\ByteStream\InMemoryStream;
use Amp\ByteStream\InputStream;
use Amp\Http\Client\RequestBody;
use Amp\Promise;
use Amp\Success;

final class StringBody implements RequestBody
{
    private $body;

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

    public function createBodyStream(): InputStream
    {
        return new InMemoryStream($this->body !== '' ? $this->body : null);
    }

    public function getHeaders(): Promise
    {
        return new Success([]);
    }

    public function getBodyLength(): Promise
    {
        return new Success(\strlen($this->body));
    }
}