/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim:set ts=2 sw=2 sts=2 et cindent: */

/* 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 "mozilla/dom/MIDIPort.h"

#include "mozilla/dom/MIDIPortChild.h"

#include "mozilla/dom/MIDIAccess.h"

#include "mozilla/dom/MIDITypes.h"

#include "mozilla/ipc/PBackgroundChild.h"

#include "mozilla/ipc/BackgroundChild.h"

#include "mozilla/dom/Promise.h"

#include "mozilla/dom/MIDITypes.h"

#include "mozilla/Unused.h"

#include "nsISupportsImpl.h" // for MOZ_COUNT_CTOR, MOZ_COUNT_DTOR

using namespace mozilla::ipc;

namespace mozilla {

namespace dom {

NS_IMPL_CYCLE_COLLECTION_INHERITED(MIDIPort,

                                   DOMEventTargetHelper,

                                   mOpeningPromise,

                                   mClosingPromise)

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(MIDIPort,

                                               DOMEventTargetHelper)

NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MIDIPort)

  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)

NS_IMPL_ADDREF_INHERITED(MIDIPort, DOMEventTargetHelper)

NS_IMPL_RELEASE_INHERITED(MIDIPort, DOMEventTargetHelper)

MIDIPort::MIDIPort(nsPIDOMWindowInner* aWindow, MIDIAccess* aMIDIAccessParent) :

  DOMEventTargetHelper(aWindow),

  mMIDIAccessParent(aMIDIAccessParent)

{

  MOZ_ASSERT(aWindow);

  MOZ_ASSERT(aMIDIAccessParent);

}

MIDIPort::~MIDIPort()

{

  if (mMIDIAccessParent) {

    mMIDIAccessParent->RemovePortListener(this);

    mMIDIAccessParent = nullptr;

  }

  if (mPort) {

    // If the IPC port channel is still alive at this point, it means we're

    // probably CC'ing this port object. Send the shutdown message to also clean

    // up the IPC channel.

    mPort->SendShutdown();

    // This will unset the IPC Port pointer. Don't call anything after this.

    mPort->Teardown();

  }

}

bool

MIDIPort::Initialize(const MIDIPortInfo& aPortInfo, bool aSysexEnabled)

{

  RefPtr<MIDIPortChild> port = new MIDIPortChild(aPortInfo, aSysexEnabled, this);

  PBackgroundChild* b = BackgroundChild::GetForCurrentThread();

  MOZ_ASSERT(b, "Should always have a valid BackgroundChild when creating a port object!");

  if (!b->SendPMIDIPortConstructor(port, aPortInfo, aSysexEnabled)) {

    return false;

  }

  mPort = port;

  // Make sure to increase the ref count for the port, so it can be cleaned up

  // by the IPC manager.

  mPort->SetActorAlive();

  return true;

}

void

MIDIPort::UnsetIPCPort()

{

  mPort = nullptr;

}

JSObject*

MIDIPort::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)

{

  return MIDIPort_Binding::Wrap(aCx, this, aGivenProto);

}

void

MIDIPort::GetId(nsString& aRetVal) const

{

  MOZ_ASSERT(mPort);

  aRetVal = mPort->MIDIPortInterface::Id();

}

void

MIDIPort::GetManufacturer(nsString& aRetVal) const

{

  MOZ_ASSERT(mPort);

  aRetVal = mPort->Manufacturer();

}

void

MIDIPort::GetName(nsString& aRetVal) const

{

  MOZ_ASSERT(mPort);

  aRetVal = mPort->Name();

}

void

MIDIPort::GetVersion(nsString& aRetVal) const

{

  MOZ_ASSERT(mPort);

  aRetVal = mPort->Version();

}

MIDIPortType

MIDIPort::Type() const

{

  MOZ_ASSERT(mPort);

  return mPort->Type();

}

MIDIPortConnectionState

MIDIPort::Connection() const

{

  MOZ_ASSERT(mPort);

  return mPort->ConnectionState();

}

MIDIPortDeviceState

MIDIPort::State() const

{

  MOZ_ASSERT(mPort);

  return mPort->DeviceState();

}

bool

MIDIPort::SysexEnabled() const

{

  MOZ_ASSERT(mPort);

  return mPort->SysexEnabled();

}

already_AddRefed<Promise>

MIDIPort::Open()

{

  MOZ_ASSERT(mPort);

  RefPtr<Promise> p;

  if (mOpeningPromise) {

    p = mOpeningPromise;

    return p.forget();

  }

  ErrorResult rv;

  nsCOMPtr<nsIGlobalObject> go = do_QueryInterface(GetOwner());

  p = Promise::Create(go, rv);

  if (rv.Failed()) {

    return nullptr;

  }

  mOpeningPromise = p;

  mPort->SendOpen();

  return p.forget();

}

already_AddRefed<Promise>

MIDIPort::Close()

{

  MOZ_ASSERT(mPort);

  RefPtr<Promise> p;

  if (mClosingPromise) {

    p = mClosingPromise;

    return p.forget();

  }

  ErrorResult rv;

  nsCOMPtr<nsIGlobalObject> go = do_QueryInterface(GetOwner());

  p = Promise::Create(go, rv);

  if (rv.Failed()) {

    return nullptr;

  }

  mClosingPromise = p;

  mPort->SendClose();

  return p.forget();

}

void

MIDIPort::Notify(const void_t& aVoid)

{

  // If we're getting notified, it means the MIDIAccess parent object is dead. Nullify our copy.

  mMIDIAccessParent = nullptr;

}

void

MIDIPort::FireStateChangeEvent()

{

  MOZ_ASSERT(mPort);

  if (mPort->ConnectionState() == MIDIPortConnectionState::Open ||

      mPort->ConnectionState() == MIDIPortConnectionState::Pending) {

    if (mOpeningPromise) {

      mOpeningPromise->MaybeResolve(this);

      mOpeningPromise = nullptr;

    }

  } else if (mPort->ConnectionState() == MIDIPortConnectionState::Closed) {

    if (mOpeningPromise) {

      mOpeningPromise->MaybeReject(NS_ERROR_DOM_INVALID_ACCESS_ERR);

      mOpeningPromise = nullptr;

    }

    if (mClosingPromise) {

      mClosingPromise->MaybeResolve(this);

      mClosingPromise = nullptr;

    }

  }

  if (mPort->DeviceState() == MIDIPortDeviceState::Connected &&

      mPort->ConnectionState() == MIDIPortConnectionState::Pending) {

    mPort->SendOpen();

  }

  // Fire MIDIAccess events first so that the port is no longer in the port maps.

  if (mMIDIAccessParent) {

    mMIDIAccessParent->FireConnectionEvent(this);

  }

  MIDIConnectionEventInit init;

  init.mPort = this;

  RefPtr<MIDIConnectionEvent> event(

    MIDIConnectionEvent::Constructor(this, NS_LITERAL_STRING("statechange"), init));

  DispatchTrustedEvent(event);

}

void

MIDIPort::Receive(const nsTArray<MIDIMessage>& aMsg)

{

  MOZ_CRASH("We should never get here!");

}

}

}