// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_
#define CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_

#include "gin/wrappable.h"

namespace blink {
class WebLocalFrame;
}

namespace content {

// This class is exposed in JS as window.statsCollectionController and provides
// functionality to read out statistics from the browser.
// Its use must be enabled specifically via the
// --enable-stats-collection-bindings command line flag.
class StatsCollectionController
    : public gin::Wrappable<StatsCollectionController> {
 public:
  static constexpr gin::WrapperInfo kWrapperInfo = {
      {gin::kEmbedderNativeGin},
      gin::kStatsCollectionController};

  StatsCollectionController(const StatsCollectionController&) = delete;
  StatsCollectionController& operator=(const StatsCollectionController&) =
      delete;

  static void Install(blink::WebLocalFrame* frame);

  // Make public for cppgc::MakeGarbageCollected.
  StatsCollectionController() = default;
  ~StatsCollectionController() override = default;

 private:
  // gin::WrappableBase
  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
      v8::Isolate* isolate) override;
  const gin::WrapperInfo* wrapper_info() const override;

  // Retrieves a histogram and returns a JSON representation of it.
  std::string GetHistogram(const std::string& histogram_name);

  // Retrieves a histogram from the browser process and returns a JSON
  // representation of it.
  std::string GetBrowserHistogram(const std::string& histogram_name);

  // Returns JSON representation of tab timing information for the current tab.
  std::string GetTabLoadTiming();
};

}  // namespace content

#endif  // CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_