<?php declare(strict_types=1);

namespace Amp\Http\Server\Driver\Internal;

use Amp\DeferredCancellation;
use Amp\DeferredFuture;
use Amp\Future;

/**
 * Used in Http2Driver.
 *
 * @internal
 */
final class Http2Stream
{
    public const OPEN = 0;
    public const RESERVED = 0b0001;
    public const REMOTE_CLOSED = 0b0010;
    public const LOCAL_CLOSED = 0b0100;

    /** @var int Bytes received on the stream. */
    public int $receivedByteCount = 0;

    public ?Future $pendingResponse = null;

    public ?Future $pendingWrite = null;

    public string $buffer = "";

    public ?DeferredFuture $deferredFuture = null;

    /** @var int Integer between 1 and 256 */
    public int $weight = 0;

    public int $dependency = 0;

    public ?int $expectedLength = null;

    public readonly DeferredCancellation $deferredCancellation;

    public function __construct(
        public int $bodySizeLimit,
        public int $serverWindow,
        public int $clientWindow,
        public int $state = self::OPEN,
    ) {
        $this->deferredCancellation = new DeferredCancellation();
    }
}