/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "PerformanceResourceTiming.h"
#include "mozilla/dom/PerformanceResourceTimingBinding.h"
#include "mozilla/Unused.h"

using namespace mozilla::dom;

NS_IMPL_CYCLE_COLLECTION_INHERITED(PerformanceResourceTiming,
                                   PerformanceEntry,
                                   mTiming)

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(PerformanceResourceTiming,
                                               PerformanceEntry)
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(PerformanceResourceTiming)
NS_INTERFACE_MAP_END_INHERITING(PerformanceEntry)

NS_IMPL_ADDREF_INHERITED(PerformanceResourceTiming, PerformanceEntry)
NS_IMPL_RELEASE_INHERITED(PerformanceResourceTiming, PerformanceEntry)

PerformanceResourceTiming::PerformanceResourceTiming(PerformanceTiming* aPerformanceTiming,
                                                     Performance* aPerformance,
                                                     const nsAString& aName,
                                                     nsIHttpChannel* aChannel)
: PerformanceEntry(aPerformance, aName, NS_LITERAL_STRING("resource")),
  mTiming(aPerformanceTiming),
  mEncodedBodySize(0),
  mTransferSize(0),
  mDecodedBodySize(0)
{
  MOZ_ASSERT(aPerformance, "Parent performance object should be provided");
  SetPropertiesFromChannel(aChannel);
}

void
PerformanceResourceTiming::SetPropertiesFromChannel(nsIHttpChannel* aChannel)
{
  if (!aChannel) {
    return;
  }

  nsAutoCString protocol;
  Unused << aChannel->GetProtocolVersion(protocol);
  SetNextHopProtocol(NS_ConvertUTF8toUTF16(protocol));

  uint64_t encodedBodySize = 0;
  Unused << aChannel->GetEncodedBodySize(&encodedBodySize);
  SetEncodedBodySize(encodedBodySize);

  uint64_t transferSize = 0;
  Unused << aChannel->GetTransferSize(&transferSize);
  SetTransferSize(transferSize);

  uint64_t decodedBodySize = 0;
  Unused << aChannel->GetDecodedBodySize(&decodedBodySize);
  if (decodedBodySize == 0) {
    decodedBodySize = encodedBodySize;
  }
  SetDecodedBodySize(decodedBodySize);
}

PerformanceResourceTiming::~PerformanceResourceTiming()
{
}

DOMHighResTimeStamp
PerformanceResourceTiming::StartTime() const
{
  // Force the start time to be the earliest of:
  //  - RedirectStart
  //  - WorkerStart
  //  - AsyncOpen
  // Ignore zero values.  The RedirectStart and WorkerStart values
  // can come from earlier redirected channels prior to the AsyncOpen
  // time being recorded.
  DOMHighResTimeStamp redirect = mTiming->RedirectStartHighRes();
  redirect = redirect ? redirect : DBL_MAX;

  DOMHighResTimeStamp worker = mTiming->WorkerStartHighRes();
  worker = worker ? worker : DBL_MAX;

  DOMHighResTimeStamp asyncOpen = mTiming->AsyncOpenHighRes();

  return std::min(asyncOpen, std::min(redirect, worker));
}

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