// Copyright 2014 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.

#ifndef COBALT_DOM_GLOBAL_STATS_H_
#define COBALT_DOM_GLOBAL_STATS_H_

#include "base/compiler_specific.h"
#include "base/memory/singleton.h"
#include "cobalt/base/c_val.h"
#include "cobalt/web/global_stats.h"
#include "cobalt/xhr/global_stats.h"

namespace cobalt {
namespace dom {

class Attr;
class DOMStringMap;
class DOMTokenList;
class HTMLCollection;
class NamedNodeMap;
class Node;
class NodeList;

// This singleton class is used to track DOM-related statistics.
class GlobalStats {
 public:
  GlobalStats(const GlobalStats&) = delete;
  GlobalStats& operator=(const GlobalStats&) = delete;
  static GlobalStats* GetInstance();

  bool CheckNoLeaks();

  void Add(Attr* object);
  void Add(DOMStringMap* object);
  void Add(DOMTokenList* object);
  void Add(HTMLCollection* object);
  void Add(NamedNodeMap* object);
  void Add(Node* object);
  void Add(NodeList* object);
  void AddEventListener() {
    web::GlobalStats::GetInstance()->AddEventListener();
  }
  void Remove(Attr* object);
  void Remove(DOMStringMap* object);
  void Remove(DOMTokenList* object);
  void Remove(HTMLCollection* object);
  void Remove(NamedNodeMap* object);
  void Remove(Node* object);
  void Remove(NodeList* object);
  void RemoveEventListener() {
    web::GlobalStats::GetInstance()->RemoveEventListener();
  }

  int GetNumEventListeners() const {
    return web::GlobalStats::GetInstance()->GetNumEventListeners();
  }
  int GetNumNodes() const { return num_nodes_; }

  void StartJavaScriptEvent() {
    web::GlobalStats::GetInstance()->StartJavaScriptEvent();
  }
  void StopJavaScriptEvent() {
    web::GlobalStats::GetInstance()->StopJavaScriptEvent();
  }

  void OnFontRequestComplete(int64 start_time);

 private:
  GlobalStats();
  ~GlobalStats();

  // DOM-related tracking
  base::CVal<int> num_attrs_;
  base::CVal<int> num_dom_string_maps_;
  base::CVal<int> num_dom_token_lists_;
  base::CVal<int> num_html_collections_;
  base::CVal<int> num_named_node_maps_;
  base::CVal<int, base::CValPublic> num_nodes_;
  base::CVal<int> num_node_lists_;

  friend struct base::DefaultSingletonTraits<GlobalStats>;

  // Font-related tracking
  base::CVal<int64, base::CValPublic> total_font_request_time_;
};

}  // namespace dom
}  // namespace cobalt

#endif  // COBALT_DOM_GLOBAL_STATS_H_