/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"
#include "nsIURI.idl"
#include "nsIPrincipal.idl"

interface WebTransportSessionEventListener;
interface nsIWebTransportStreamCallback;
interface nsIWebTransportBidirectionalStream;
interface nsIWebTransportSendStream;
interface nsIWebTransportReceiveStream;
interface nsIWebTransportHash;

%{C++
namespace mozilla::dom {
class ClientInfo;
}
namespace mozilla::net {
class Http3WebTransportSession;
class Http3WebTransportStream;
}
%}

[ptr] native Http3WebTransportSessionPtr(mozilla::net::Http3WebTransportSession);
[ptr] native Http3WebTransportStreamPtr(mozilla::net::Http3WebTransportStream);
native Datagram(nsTArray<uint8_t>&&);
[ref] native const_MaybeClientInfoRef(const mozilla::Maybe<mozilla::dom::ClientInfo>);

[builtinclass, scriptable, uuid(c20d6e77-8cb1-4838-a88d-fff826080aa3)]
interface nsIWebTransport : nsISupports {
  cenum WebTransportError : 16 {
    UNKNOWN_ERROR,
    INVALID_STATE_ERROR,
  };

  // When called, perform steps in "Initialization WebTransport over HTTP".
  void asyncConnect(in nsIURI aURI,
                    in boolean aDedicated,
                    in Array<nsIWebTransportHash> aServerCertHashes,
                    in nsIPrincipal aLoadingPrincipal,
                    in unsigned long aSecurityFlags,
                    in WebTransportSessionEventListener aListener);

  void asyncConnectWithClient(in nsIURI aURI,
                    in boolean aDedicated,
                    in Array<nsIWebTransportHash> aServerCertHashes,
                    in nsIPrincipal aLoadingPrincipal,
                    in unsigned long aSecurityFlags,
                    in WebTransportSessionEventListener aListener,
                    in const_MaybeClientInfoRef aClientInfo);

  // Asynchronously get stats.
  void getStats();

  // Close the session.
  void closeSession(in uint32_t aErrorCode,
                    in ACString aReason);

  // Create and open a new WebTransport stream.
  void createOutgoingBidirectionalStream(in nsIWebTransportStreamCallback aListener);
  void createOutgoingUnidirectionalStream(in nsIWebTransportStreamCallback aListener);

  void sendDatagram(in Array<uint8_t> aData, in uint64_t aTrackingId);

  void getMaxDatagramSize();

  // This can be only called after onSessionReady().
  // After this point, we can retarget the underlying WebTransportSessionProxy
  // object off main thread.
  [noscript] void retargetTo(in nsIEventTarget aTarget);
};

// Events related to a WebTransport session.
[scriptable, uuid(0e3cb269-f318-43c8-959e-897f57894b71)]
interface WebTransportSessionEventListener : nsISupports {
  // This is used to let the consumer of nsIWebTransport know that the
  // underlying WebTransportSession object is ready to use.
  void onSessionReady(in uint64_t aSessionId);
  // This is used internally to pass the reference of WebTransportSession
  // object to WebTransportSessionProxy.
  void onSessionReadyInternal(in Http3WebTransportSessionPtr aSession);
  void onSessionClosed(in boolean aCleanly,
                       in uint32_t aErrorCode,
                       in ACString aReason);

  // When a new stream has been received.
  void onIncomingBidirectionalStreamAvailable(in nsIWebTransportBidirectionalStream aStream);
  void onIncomingUnidirectionalStreamAvailable(in nsIWebTransportReceiveStream aStream);

  // This is used internally to pass the reference of Http3WebTransportStream
  // object to WebTransportSessionProxy.
  void onIncomingStreamAvailableInternal(in Http3WebTransportStreamPtr aStream);

  void onStopSending(in uint64_t aStreamId, in nsresult aError);
  void onResetReceived(in uint64_t aStreamId, in nsresult aError);

  // When a new datagram has been received.
  void onDatagramReceived(in Array<uint8_t> aData);

  // This is used internally to pass the datagram to WebTransportSessionProxy.
  void onDatagramReceivedInternal(in Datagram aData);

  void onMaxDatagramSize(in uint64_t aSize);

  cenum DatagramOutcome: 32 {
    UNKNOWN               = 0,
    DROPPED_TOO_MUCH_DATA = 1,
    SENT                  = 2,
  };

  void onOutgoingDatagramOutCome(
    in uint64_t aId,
    in WebTransportSessionEventListener_DatagramOutcome aOutCome);

  // void onStatsAvailable(in WebTransportStats aStats);
};

[uuid(faad75bd-83c6-420b-9fdb-a70bd70be449)]
interface WebTransportConnectionSettings : nsISupports {
  // WebTransport specific connection information
  readonly attribute boolean dedicated;
  void getServerCertificateHashes(out Array<nsIWebTransportHash> aServerCertHashes);
};

// This interface is used as a callback when creating an outgoing
// unidirectional or bidirectional stream.
[scriptable, uuid(c6eeff1d-599b-40a8-9157-c7a40c3d51a2)]
interface nsIWebTransportStreamCallback : nsISupports {
  void onBidirectionalStreamReady(in nsIWebTransportBidirectionalStream aStream);
  void onUnidirectionalStreamReady(in nsIWebTransportSendStream aStream);
  void onError(in uint8_t aError);
};

[scriptable, uuid(2523a26e-94be-4de6-8c27-9b4ffff742f0)]
interface nsIWebTransportHash : nsISupports {
  readonly attribute ACString algorithm;
  readonly attribute Array<uint8_t> value;
};