/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "AbortSignal.h"

#include "AbortController.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/AbortSignalBinding.h"

namespace mozilla {
namespace dom {

NS_IMPL_CYCLE_COLLECTION_CLASS(AbortSignal)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(AbortSignal,
                                                  DOMEventTargetHelper)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mController)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(AbortSignal,
                                                DOMEventTargetHelper)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mController)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(AbortSignal)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)

NS_IMPL_ADDREF_INHERITED(AbortSignal, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(AbortSignal, DOMEventTargetHelper)

AbortSignal::AbortSignal(AbortController* aController, bool aAborted)
    : DOMEventTargetHelper(aController->GetParentObject()),
      mController(aController),
      mAborted(aAborted) {}

AbortSignal::AbortSignal(bool aAborted) : mAborted(aAborted) {}

JSObject* AbortSignal::WrapObject(JSContext* aCx,
                                  JS::Handle<JSObject*> aGivenProto) {
  return AbortSignalBinding::Wrap(aCx, this, aGivenProto);
}

bool AbortSignal::Aborted() const { return mAborted; }

void AbortSignal::Abort() {
  MOZ_ASSERT(!mAborted);
  mAborted = true;

  // Let's inform the followers.
  for (uint32_t i = 0; i < mFollowers.Length(); ++i) {
    mFollowers[i]->Abort();
  }

  EventInit init;
  init.mBubbles = false;
  init.mCancelable = false;

  RefPtr<Event> event =
      Event::Constructor(this, NS_LITERAL_STRING("abort"), init);
  event->SetTrusted(true);

  bool dummy;
  DispatchEvent(event, &dummy);
}

void AbortSignal::AddFollower(AbortFollower* aFollower) {
  MOZ_DIAGNOSTIC_ASSERT(aFollower);
  if (!mFollowers.Contains(aFollower)) {
    mFollowers.AppendElement(aFollower);
  }
}

void AbortSignal::RemoveFollower(AbortFollower* aFollower) {
  MOZ_DIAGNOSTIC_ASSERT(aFollower);
  mFollowers.RemoveElement(aFollower);
}

// AbortFollower
// ----------------------------------------------------------------------------

AbortFollower::~AbortFollower() { Unfollow(); }

void AbortFollower::Follow(AbortSignal* aSignal) {
  MOZ_DIAGNOSTIC_ASSERT(aSignal);

  Unfollow();

  mFollowingSignal = aSignal;
  aSignal->AddFollower(this);
}

void AbortFollower::Unfollow() {
  if (mFollowingSignal) {
    mFollowingSignal->RemoveFollower(this);
    mFollowingSignal = nullptr;
  }
}

bool AbortFollower::IsFollowing() const { return !!mFollowingSignal; }

}  // namespace dom
}  // namespace mozilla