import type { Stream, TypedEventTarget, MessageStream, AbortOptions } from './index.js';
/**
 * User-facing message stream muxer options
 */
export interface StreamMuxerOptions<MuxedStreamOptions extends StreamOptions = StreamOptions> {
    /**
     * Configuration options for each outgoing/incoming stream
     */
    streamOptions?: MuxedStreamOptions;
    /**
     * libp2p is notified of incoming streams via the muxer's 'stream' event.
     *
     * During connection establishment there may be a small window where a muxer
     * starts to process incoming stream data before a listener has been added for
     * the 'stream' event.
     *
     * If no handler is registered for this event incoming streams can be missed
     * so when this is the case muxers queue streams internally as "early
     * streams", and will defer emitting the 'stream' event until after a listener
     * has been registered.
     *
     * Allowing an unlimited amount of early streams can cause excessive memory
     * consumption so this setting controls how many early streams to store when
     * no 'stream' listener has been registered.
     *
     * If more streams than this are opened before a listener is added the muxed
     * connection will be reset.
     *
     * @default 10
     */
    maxEarlyStreams?: number;
    /**
     * Maximum size of a message in bytes that we'll send on a stream - this
     * ensures that a single stream doesn't hog a connection
     *
     * @default 65_536
     */
    maxMessageSize?: number;
    /**
     * Maximum number of concurrent inbound streams that we accept - if the peer
     * tries to open more streams, those will be reset immediately
     *
     * @default 1_000
     */
    maxInboundStreams?: number;
    /**
     * Maximum number of concurrent outbound streams that we accept - if the
     * application tries to open more streams, the call to `newStream` will throw
     *
     * @default 1_000
     */
    maxOutboundStreams?: number;
}
/**
 * User-facing message stream options
 */
export interface StreamOptions {
    /**
     * If no data is sent or received in this number of ms the stream will be
     * reset and an 'error' event emitted.
     *
     * @default 120_000
     */
    inactivityTimeout?: number;
    /**
     * The maximum number of bytes to store when paused or before a 'message'
     * event handler is added.
     *
     * If the internal buffer overflows this value the stream will be reset.
     *
     * @default 4_194_304
     */
    maxReadBufferLength?: number;
    /**
     * The maximum number of bytes to store when the remote end of the stream is
     * applying backpressure, or when it is slow to accept new bytes.
     *
     * If the internal buffer overflows this value the stream will be reset.
     *
     * @default Infinity
     */
    maxWriteBufferLength?: number;
}
export interface StreamMuxerFactory<Muxer extends StreamMuxer = StreamMuxer> {
    /**
     * The protocol used to select this muxer during connection opening
     */
    protocol: string;
    /**
     * Creates a new stream muxer to be used with a new connection
     */
    createStreamMuxer(maConn: MessageStream): Muxer;
}
export interface StreamMuxerEvents<MuxedStream extends Stream = Stream> {
    /**
     * An incoming stream was created
     */
    stream: CustomEvent<MuxedStream>;
}
export interface CreateStreamOptions extends AbortOptions, StreamOptions {
    /**
     * If a single protocol was requested and the muxer has support for this,
     * pre-negotiate the protocol using this value, otherwise multistream-select
     * will be run over the stream after opening.
     */
    protocol?: string;
}
export type StreamMuxerStatus = 'open' | 'closing' | 'closed';
/**
 * A libp2p stream muxer
 */
export interface StreamMuxer<MuxedStream extends Stream = Stream> extends TypedEventTarget<StreamMuxerEvents<MuxedStream>> {
    /**
     * The protocol used to select this muxer during connection opening
     */
    protocol: string;
    /**
     * A list of streams that are currently open
     */
    streams: MuxedStream[];
    /**
     * The status of the muxer
     */
    status: StreamMuxerStatus;
    /**
     * Create a new stream
     */
    createStream(options?: CreateStreamOptions): Promise<MuxedStream>;
    /**
     * Immediately close the muxer, abort every open stream and discard any
     * unsent/unread data.
     */
    abort(err: Error): void;
    /**
     * Gracefully close the muxer. All open streams will be gracefully closed, and
     * the returned promise will either resolve when any/all unsent data has been
     * sent, or it will reject if the passed abort signal fires before this
     * happens.
     */
    close(options?: AbortOptions): Promise<void>;
}
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