// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "cobalt/web/event.h"

#include "base/compiler_specific.h"
#include "base/time/time.h"
#include "cobalt/web/event_target.h"
#include "starboard/common/time.h"

namespace cobalt {
namespace web {

Event::Event(UninitializedFlag uninitialized_flag)
    : event_phase_(kNone),
      time_stamp_(GetEventTime(starboard::CurrentMonotonicTime())) {
  InitEventInternal(base::Token(), false, false);
}

Event::Event(const char* type) : Event(base::Token(type)) {}
Event::Event(const std::string& type) : Event(base::Token(type)) {}
Event::Event(base::Token type)
    : event_phase_(kNone),
      time_stamp_(GetEventTime(starboard::CurrentMonotonicTime())) {
  InitEventInternal(type, false, false);
}
Event::Event(const std::string& type, const EventInit& init_dict)
    : Event(base::Token(type), init_dict) {}
Event::Event(base::Token type, Bubbles bubbles, Cancelable cancelable)
    : event_phase_(kNone),
      time_stamp_(GetEventTime(starboard::CurrentMonotonicTime())) {
  InitEventInternal(type, bubbles == kBubbles, cancelable == kCancelable);
}

Event::Event(base::Token type, const EventInit& init_dict)
    : event_phase_(kNone),
      time_stamp_(GetEventTime(starboard::CurrentMonotonicTime())) {
  SB_DCHECK(init_dict.has_bubbles());
  SB_DCHECK(init_dict.has_cancelable());
  if (init_dict.time_stamp() != 0) {
    time_stamp_ = init_dict.time_stamp();
  }
  InitEventInternal(type, init_dict.bubbles(), init_dict.cancelable());
}

Event::~Event() {
  // This needs to be in the .cc file because EventTarget is only forward
  // declared in the .h file, and the implicit destructor for target_ cannot
  // find the destructor for EventTarget in the header.
}

const scoped_refptr<EventTarget>& Event::target() const { return target_; }

const scoped_refptr<EventTarget>& Event::current_target() const {
  return current_target_;
}

void Event::InitEvent(const std::string& type, bool bubbles, bool cancelable) {
  if (IsBeingDispatched() || target() || current_target()) {
    return;
  }

  InitEventInternal(base::Token(type), bubbles, cancelable);
}

void Event::set_target(const scoped_refptr<EventTarget>& target) {
  target_ = target;
}

void Event::set_current_target(const scoped_refptr<EventTarget>& target) {
  current_target_ = target;
}

void Event::InitEventInternal(base::Token type, bool bubbles, bool cancelable) {
  type_ = type;
  bubbles_ = bubbles;
  cancelable_ = cancelable;

  propagation_stopped_ = false;
  immediate_propagation_stopped_ = false;
  default_prevented_ = false;
}

void Event::TraceMembers(script::Tracer* tracer) {
  tracer->Trace(target_);
  tracer->Trace(current_target_);
}

uint64 Event::GetEventTime(int64_t monotonic_time) {
  // Current delta from Windows epoch.
  int64_t time_delta =
      starboard::PosixTimeToWindowsTime(starboard::CurrentPosixTime()) -
      starboard::CurrentMonotonicTime();
  base::Time base_time = base::Time::FromDeltaSinceWindowsEpoch(
      base::TimeDelta::FromMicroseconds(time_delta + monotonic_time));
  // For now, continue using the old specification which specifies real time
  // since 1970 by calling the `ToJsTime` method.
  // https://www.w3.org/TR/dom/#dom-event-timestamp
  return static_cast<uint64>(base_time.ToJsTime());
}

}  // namespace web
}  // namespace cobalt