/*
 *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef MODULES_DESKTOP_CAPTURE_TAB_CAPTURER_H_
#define MODULES_DESKTOP_CAPTURE_TAB_CAPTURER_H_

#include <memory>
#include <string>

#include "modules/desktop_capture/desktop_capture_options.h"
#include "modules/desktop_capture/desktop_capturer.h"
#include "mozilla/dom/ImageBitmap.h"
#include "mozilla/MozPromise.h"
#include "mozilla/TaskQueue.h"
#include "nsDeque.h"
#include "nsThreadUtils.h"

namespace mozilla {

class CaptureFrameRequest;
class TabCapturedHandler;

class TabCapturerWebrtc : public webrtc::DesktopCapturer {
 private:
  ~TabCapturerWebrtc();

 public:
  friend class CaptureFrameRequest;
  friend class TabCapturedHandler;

  explicit TabCapturerWebrtc(const webrtc::DesktopCaptureOptions& options);

  static std::unique_ptr<webrtc::DesktopCapturer> CreateRawWindowCapturer(
      const webrtc::DesktopCaptureOptions& options);

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

  // DesktopCapturer interface.
  void Start(Callback* callback) override;
  void CaptureFrame() override;
  bool GetSourceList(SourceList* sources) override;
  bool SelectSource(SourceId id) override;
  bool FocusOnSelectedSource() override;
  bool IsOccluded(const webrtc::DesktopVector& pos) override;

 private:
  // Capture code
  using CapturePromise = MozPromise<RefPtr<dom::ImageBitmap>, nsresult, true>;
  RefPtr<CapturePromise> CaptureFrameNow();

  // Helper that checks for overrun requests. Returns true if aRequest had not
  // been dropped.
  bool CompleteRequest(CaptureFrameRequest* aRequest);

  const RefPtr<TaskQueue> mMainThreadWorker;
  webrtc::DesktopCapturer::Callback* mCallback = nullptr;
  uint64_t mBrowserId = 0;

  // mMainThreadWorker only
  nsRefPtrDeque<CaptureFrameRequest> mRequests;
};

}  // namespace mozilla

#endif  // MODULES_DESKTOP_CAPTURE_TAB_CAPTURER_H_