/* -*- 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/MIDIAccess.h"

#include "mozilla/dom/MIDIAccessManager.h"

#include "mozilla/dom/MIDIPort.h"

#include "mozilla/dom/MIDIAccessBinding.h"

#include "mozilla/dom/MIDIConnectionEvent.h"

#include "mozilla/dom/MIDIOptionsBinding.h"

#include "mozilla/dom/MIDIOutputMapBinding.h"

#include "mozilla/dom/MIDIInputMapBinding.h"

#include "mozilla/dom/MIDIOutputMap.h"

#include "mozilla/dom/MIDIInputMap.h"

#include "mozilla/dom/MIDIOutput.h"

#include "mozilla/dom/MIDIInput.h"

#include "mozilla/dom/MIDITypes.h"

#include "mozilla/dom/Promise.h"

#include "mozilla/dom/PContent.h"

#include "nsIRunnable.h"

#include "nsIDocument.h"

#include "nsPIDOMWindow.h"

#include "nsContentPermissionHelper.h"

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

#include "IPCMessageUtils.h"

namespace mozilla {

namespace dom {

NS_IMPL_CYCLE_COLLECTION_CLASS(MIDIAccess)

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(MIDIAccess,

                                               DOMEventTargetHelper)

NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(MIDIAccess,

                                                  DOMEventTargetHelper)

  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInputMap)

  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOutputMap)

  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAccessPromise)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(MIDIAccess,

                                                DOMEventTargetHelper)

  NS_IMPL_CYCLE_COLLECTION_UNLINK(mInputMap)

  NS_IMPL_CYCLE_COLLECTION_UNLINK(mOutputMap)

  NS_IMPL_CYCLE_COLLECTION_UNLINK(mAccessPromise)

  tmp->Shutdown();

NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MIDIAccess)

  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)

NS_IMPL_ADDREF_INHERITED(MIDIAccess, DOMEventTargetHelper)

NS_IMPL_RELEASE_INHERITED(MIDIAccess, DOMEventTargetHelper)

MIDIAccess::MIDIAccess(nsPIDOMWindowInner* aWindow, bool aSysexEnabled,

                       Promise* aPromise) :

  DOMEventTargetHelper(aWindow),

  mInputMap(new MIDIInputMap(aWindow)),

  mOutputMap(new MIDIOutputMap(aWindow)),

  mSysexEnabled(aSysexEnabled),

  mAccessPromise(aPromise),

  mHasShutdown(false)

{

  MOZ_ASSERT(aWindow);

  MOZ_ASSERT(aPromise);

}

MIDIAccess::~MIDIAccess()

{

  Shutdown();

}

void

MIDIAccess::Shutdown()

{

  if (mHasShutdown) {

    return;

  }

  mDestructionObservers.Broadcast(void_t());

  if (MIDIAccessManager::IsRunning()) {

    MIDIAccessManager::Get()->RemoveObserver(this);

  }

  mHasShutdown = true;

}

void

MIDIAccess::FireConnectionEvent(MIDIPort* aPort)

{

  MOZ_ASSERT(aPort);

  MIDIConnectionEventInit init;

  init.mPort = aPort;

  nsAutoString id;

  aPort->GetId(id);

  ErrorResult rv;

  if (aPort->State() == MIDIPortDeviceState::Disconnected) {

    if (aPort->Type() == MIDIPortType::Input &&

        MIDIInputMap_Binding::MaplikeHelpers::Has(mInputMap, id, rv)) {

      MIDIInputMap_Binding::MaplikeHelpers::Delete(mInputMap, id, rv);

    } else if (aPort->Type() == MIDIPortType::Output &&

               MIDIOutputMap_Binding::MaplikeHelpers::Has(mOutputMap, id, rv)) {

      MIDIOutputMap_Binding::MaplikeHelpers::Delete(mOutputMap, id, rv);

    }

    // Check to make sure Has()/Delete() calls haven't failed.

    if(NS_WARN_IF(rv.Failed())) {

      return;

    }

  } else {

    // If we receive an event from a port that is not in one of our port maps,

    // this means a port that was disconnected has been reconnected, with the port

    // owner holding the object during that time, and we should add that port

    // object to our maps again.

    if (aPort->Type() == MIDIPortType::Input &&

        !MIDIInputMap_Binding::MaplikeHelpers::Has(mInputMap, id, rv)) {

      if(NS_WARN_IF(rv.Failed())) {

        return;

      }

      MIDIInputMap_Binding::MaplikeHelpers::Set(mInputMap,

                                               id,

                                               *(static_cast<MIDIInput*>(aPort)),

                                               rv);

      if(NS_WARN_IF(rv.Failed())) {

        return;

      }

    } else if (aPort->Type() == MIDIPortType::Output &&

               !MIDIOutputMap_Binding::MaplikeHelpers::Has(mOutputMap, id, rv)) {

      if(NS_WARN_IF(rv.Failed())) {

        return;

      }

      MIDIOutputMap_Binding::MaplikeHelpers::Set(mOutputMap,

                                                id,

                                                *(static_cast<MIDIOutput*>(aPort)),

                                                rv);

      if(NS_WARN_IF(rv.Failed())) {

        return;

      }

    }

  }

  RefPtr<MIDIConnectionEvent> event =

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

  DispatchTrustedEvent(event);

}

void

MIDIAccess::MaybeCreateMIDIPort(const MIDIPortInfo& aInfo, ErrorResult& aRv)

{

  nsAutoString id(aInfo.id());

  MIDIPortType type = static_cast<MIDIPortType>(aInfo.type());

  RefPtr<MIDIPort> port;

  if (type == MIDIPortType::Input) {

    bool hasPort = MIDIInputMap_Binding::MaplikeHelpers::Has(mInputMap, id, aRv);

    if (hasPort || NS_WARN_IF(aRv.Failed())) {

      // We already have the port in our map.

      return;

    }

    port = MIDIInput::Create(GetOwner(), this, aInfo, mSysexEnabled);

    if (NS_WARN_IF(!port)) {

      aRv.Throw(NS_ERROR_FAILURE);

      return;

    }

    MIDIInputMap_Binding::MaplikeHelpers::Set(mInputMap,

                                             id,

                                             *(static_cast<MIDIInput*>(port.get())),

                                             aRv);

    if (NS_WARN_IF(aRv.Failed())) {

      return;

    }

  } else if (type == MIDIPortType::Output) {

    bool hasPort = MIDIOutputMap_Binding::MaplikeHelpers::Has(mOutputMap, id, aRv);

    if (hasPort || NS_WARN_IF(aRv.Failed())) {

      // We already have the port in our map.

      return;

    }

    port = MIDIOutput::Create(GetOwner(), this, aInfo, mSysexEnabled);

    if (NS_WARN_IF(!port)) {

      aRv.Throw(NS_ERROR_FAILURE);

      return;

    }

    MIDIOutputMap_Binding::MaplikeHelpers::Set(mOutputMap,

                                              id,

                                              *(static_cast<MIDIOutput*>(port.get())),

                                              aRv);

    if (NS_WARN_IF(aRv.Failed())) {

      return;

    }

  } else {

    // If we hit this, then we have some port that is neither input nor output.

    // That is bad.

    MOZ_CRASH("We shouldn't be here!");

  }

  // Set up port to listen for destruction of this access object.

  mDestructionObservers.AddObserver(port);

  // If we haven't resolved the promise for handing the MIDIAccess object to

  // content, this means we're still populating the list of already connected

  // devices. Don't fire events yet.

  if (!mAccessPromise) {

    FireConnectionEvent(port);

  }

}

// For the MIDIAccess object, only worry about new connections, where we create

// MIDIPort objects. When a port is removed and the MIDIPortRemove event is

// received, that will be handled by the MIDIPort object itself, and it will

// request removal from MIDIAccess's maps.

void

MIDIAccess::Notify(const MIDIPortList& aEvent)

{

  ErrorResult rv;

  for (auto& port : aEvent.ports()) {

    // Something went very wrong. Warn and return.

    MaybeCreateMIDIPort(port, rv);

    if (rv.Failed()) {

      if (!mAccessPromise) {

        return;

      }

      mAccessPromise->MaybeReject(rv);

      mAccessPromise = nullptr;

    }

  }

  if (!mAccessPromise) {

    return;

  }

  mAccessPromise->MaybeResolve(this);

  mAccessPromise = nullptr;

}

JSObject*

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

{

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

}

void

MIDIAccess::RemovePortListener(MIDIAccessDestructionObserver* aObs)

{

  mDestructionObservers.RemoveObserver(aObs);

}

} // namespace dom

} // namespace mozilla