// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "modules/vr/NavigatorVR.h"

#include "bindings/core/v8/ScriptPromiseResolver.h"
#include "core/dom/DOMException.h"
#include "core/dom/Document.h"
#include "core/dom/ExceptionCode.h"
#include "core/frame/LocalDOMWindow.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Navigator.h"
#include "core/frame/UseCounter.h"
#include "core/page/Page.h"
#include "modules/vr/VRController.h"
#include "modules/vr/VRDisplay.h"
#include "modules/vr/VRGetDevicesCallback.h"
#include "modules/vr/VRPose.h"
#include "wtf/PtrUtil.h"

namespace blink {

NavigatorVR* NavigatorVR::from(Document& document) {
  if (!document.frame() || !document.frame()->domWindow())
    return 0;
  Navigator& navigator = *document.frame()->domWindow()->navigator();
  return &from(navigator);
}

NavigatorVR& NavigatorVR::from(Navigator& navigator) {
  NavigatorVR* supplement = static_cast<NavigatorVR*>(
      Supplement<Navigator>::from(navigator, supplementName()));
  if (!supplement) {
    supplement = new NavigatorVR(navigator.frame());
    provideTo(navigator, supplementName(), supplement);
  }
  return *supplement;
}

ScriptPromise NavigatorVR::getVRDisplays(ScriptState* scriptState,
                                         Navigator& navigator) {
  return NavigatorVR::from(navigator).getVRDisplays(scriptState);
}

ScriptPromise NavigatorVR::getVRDisplays(ScriptState* scriptState) {
  ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
  ScriptPromise promise = resolver->promise();

  Document* document = frame() ? frame()->document() : 0;

  if (!document || !controller()) {
    DOMException* exception = DOMException::create(
        InvalidStateError, "The object is no longer associated to a document.");
    resolver->reject(exception);
    return promise;
  }

  UseCounter::count(*document, UseCounter::VRGetDisplays);
  ExecutionContext* executionContext = scriptState->getExecutionContext();
  String errorMessage;
  if (!executionContext->isSecureContext(errorMessage))
    UseCounter::count(*document, UseCounter::VRGetDisplaysInsecureOrigin);

  controller()->getDisplays(resolver);

  return promise;
}

VRController* NavigatorVR::controller() {
  if (!frame())
    return 0;

  if (!m_controller) {
    m_controller = new VRController(this);
  }

  return m_controller;
}

Document* NavigatorVR::document() {
  return frame() ? frame()->document() : 0;
}

DEFINE_TRACE(NavigatorVR) {
  visitor->trace(m_controller);

  Supplement<Navigator>::trace(visitor);
  DOMWindowProperty::trace(visitor);
}

NavigatorVR::NavigatorVR(LocalFrame* frame) : DOMWindowProperty(frame) {}

NavigatorVR::~NavigatorVR() {}

const char* NavigatorVR::supplementName() {
  return "NavigatorVR";
}

void NavigatorVR::fireVRDisplayPresentChange(VRDisplay* display) {
  if (frame() && frame()->localDOMWindow()) {
    frame()->localDOMWindow()->enqueueWindowEvent(VRDisplayEvent::create(
        EventTypeNames::vrdisplaypresentchange, true, false, display, ""));
  }
}

void NavigatorVR::fireVREvent(VRDisplayEvent* event) {
  if (frame() && frame()->localDOMWindow()) {
    frame()->localDOMWindow()->enqueueWindowEvent(event);
  }
}

}  // namespace blink