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

 /* vim:set ts=2 sw=2 et tw=78: */

 /* 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/TextTrack.h"

 #include "mozilla/dom/TextTrackBinding.h"

 #include "mozilla/dom/TextTrackList.h"

 #include "mozilla/dom/TextTrackCue.h"

 #include "mozilla/dom/TextTrackCueList.h"

 #include "mozilla/dom/TextTrackRegion.h"

 #include "mozilla/dom/HTMLMediaElement.h"

 #include "mozilla/dom/HTMLTrackElement.h"

 namespace mozilla {

 namespace dom {

 NS_IMPL_CYCLE_COLLECTION_INHERITED(TextTrack,

                                    DOMEventTargetHelper,

                                    mCueList,

                                    mActiveCueList,

                                    mTextTrackList,

                                    mTrackElement)

 NS_IMPL_ADDREF_INHERITED(TextTrack, DOMEventTargetHelper)

 NS_IMPL_RELEASE_INHERITED(TextTrack, DOMEventTargetHelper)

 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(TextTrack)

 NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)

 TextTrack::TextTrack(nsPIDOMWindow* aOwnerWindow,

                      TextTrackKind aKind,

                      const nsAString& aLabel,

                      const nsAString& aLanguage,

                      TextTrackMode aMode,

                      TextTrackReadyState aReadyState,

                      TextTrackSource aTextTrackSource)

   : DOMEventTargetHelper(aOwnerWindow)

   , mKind(aKind)

   , mLabel(aLabel)

   , mLanguage(aLanguage)

   , mMode(aMode)

   , mReadyState(aReadyState)

   , mTextTrackSource(aTextTrackSource)

 {

   SetDefaultSettings();

 }

 TextTrack::TextTrack(nsPIDOMWindow* aOwnerWindow,

                      TextTrackList* aTextTrackList,

                      TextTrackKind aKind,

                      const nsAString& aLabel,

                      const nsAString& aLanguage,

                      TextTrackMode aMode,

                      TextTrackReadyState aReadyState,

                      TextTrackSource aTextTrackSource)

   : DOMEventTargetHelper(aOwnerWindow)

   , mTextTrackList(aTextTrackList)

   , mKind(aKind)

   , mLabel(aLabel)

   , mLanguage(aLanguage)

   , mMode(aMode)

   , mReadyState(aReadyState)

   , mTextTrackSource(aTextTrackSource)

 {

   SetDefaultSettings();

 }

 void

 TextTrack::SetDefaultSettings()

 {

   nsPIDOMWindow* ownerWindow = GetOwner();

   mCueList = new TextTrackCueList(ownerWindow);

   mActiveCueList = new TextTrackCueList(ownerWindow);

   mCuePos = 0;

   mDirty = false;

 }

 JSObject*

 TextTrack::WrapObject(JSContext* aCx)

 {

   return TextTrackBinding::Wrap(aCx, this);

 }

 void

 TextTrack::SetMode(TextTrackMode aValue)

 {

   if (mMode != aValue) {

     mMode = aValue;

     if (mTextTrackList) {

       mTextTrackList->CreateAndDispatchChangeEvent();

     }

   }

 }

 void

 TextTrack::GetId(nsAString& aId) const

 {

   // If the track has a track element then its id should be the same as the

   // track element's id.

   if (mTrackElement) {

     mTrackElement->GetAttribute(NS_LITERAL_STRING("id"), aId);

   }

 }

 void

 TextTrack::AddCue(TextTrackCue& aCue)

 {

   mCueList->AddCue(aCue);

   aCue.SetTrack(this);

   if (mTextTrackList) {

     HTMLMediaElement* mediaElement = mTextTrackList->GetMediaElement();

     if (mediaElement) {

       mediaElement->AddCue(aCue);

     }

   }

   SetDirty();

 }

 void

 TextTrack::RemoveCue(TextTrackCue& aCue, ErrorResult& aRv)

 {

   mCueList->RemoveCue(aCue, aRv);

   SetDirty();

 }

 void

 TextTrack::SetCuesDirty()

 {

   for (uint32_t i = 0; i < mCueList->Length(); i++) {

     ((*mCueList)[i])->Reset();

   }

 }

 void

 TextTrack::UpdateActiveCueList()

 {

   if (!mTextTrackList) {

     return;

   }

   HTMLMediaElement* mediaElement = mTextTrackList->GetMediaElement();

   if (!mediaElement) {

     return;

   }

   // If we are dirty, i.e. an event happened that may cause the sorted mCueList

   // to have changed like a seek or an insert for a cue, than we need to rebuild

   // the active cue list from scratch.

   if (mDirty) {

     mCuePos = 0;

     mDirty = false;

     mActiveCueList->RemoveAll();

   }

   double playbackTime = mediaElement->CurrentTime();

   // Remove all the cues from the active cue list whose end times now occur

   // earlier then the current playback time.

   for (uint32_t i = mActiveCueList->Length(); i > 0; i--) {

     if ((*mActiveCueList)[i - 1]->EndTime() < playbackTime) {

       mActiveCueList->RemoveCueAt(i - 1);

     }

   }

   // Add all the cues, starting from the position of the last cue that was

   // added, that have valid start and end times for the current playback time.

   // We can stop iterating safely once we encounter a cue that does not have

   // a valid start time as the cue list is sorted.

   for (; mCuePos < mCueList->Length() &&

          (*mCueList)[mCuePos]->StartTime() <= playbackTime; mCuePos++) {

     if ((*mCueList)[mCuePos]->EndTime() >= playbackTime) {

       mActiveCueList->AddCue(*(*mCueList)[mCuePos]);

     }

   }

 }

 TextTrackCueList*

 TextTrack::GetActiveCues() {

   if (mMode != TextTrackMode::Disabled) {

     UpdateActiveCueList();

     return mActiveCueList;

   }

   return nullptr;

 }

 void

 TextTrack::GetActiveCueArray(nsTArray<nsRefPtr<TextTrackCue> >& aCues)

 {

   if (mMode != TextTrackMode::Disabled) {

     UpdateActiveCueList();

     mActiveCueList->GetArray(aCues);

   }

 }

 TextTrackReadyState

 TextTrack::ReadyState() const

 {

   return mReadyState;

 }

 void

 TextTrack::SetReadyState(uint32_t aReadyState)

 {

   if (aReadyState <= TextTrackReadyState::FailedToLoad) {

     SetReadyState(static_cast<TextTrackReadyState>(aReadyState));

   }

 }

 void

 TextTrack::SetReadyState(TextTrackReadyState aState)

 {

   mReadyState = aState;

   if (!mTextTrackList) {

     return;

   }

   HTMLMediaElement* mediaElement = mTextTrackList->GetMediaElement();

   if (mediaElement && (mReadyState == TextTrackReadyState::Loaded||

       mReadyState == TextTrackReadyState::FailedToLoad)) {

     mediaElement->RemoveTextTrack(this, true);

   }

 }

 TextTrackList*

 TextTrack::GetTextTrackList()

 {

   return mTextTrackList;

 }

 void

 TextTrack::SetTextTrackList(TextTrackList* aTextTrackList)

 {

   mTextTrackList = aTextTrackList;

 }

 HTMLTrackElement*

 TextTrack::GetTrackElement() {

   return mTrackElement;

 }

 void

 TextTrack::SetTrackElement(HTMLTrackElement* aTrackElement) {

   mTrackElement = aTrackElement;

 }

 } // namespace dom

 } // namespace mozilla