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/****************************************************************************
**
** Copyright (c) 2012 The Chromium Authors. All rights reserved.
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWebEngine module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef MEDIA_CAPTURE_DEVICES_DISPATCHER_H
#define MEDIA_CAPTURE_DEVICES_DISPATCHER_H

#include <deque>
#include <list>
#include <map>
#include <QtCore/qcompilerdetection.h>

#include "web_contents_adapter_client.h"

#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "content/public/browser/media_observer.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/web_contents_delegate.h"
#include "content/public/common/media_stream_request.h"

class DesktopStreamsRegistry;

namespace QtWebEngineCore {

// This singleton is used to receive updates about media events from the content
// layer. Based on Chrome's implementation.
class MediaCaptureDevicesDispatcher : public content::MediaObserver,
                                      public content::NotificationObserver {
 public:

  static MediaCaptureDevicesDispatcher *GetInstance();

  void processMediaAccessRequest(WebContentsAdapterClient *, content::WebContents *, const content::MediaStreamRequest &, const content::MediaResponseCallback &);

  // Called back from our WebContentsAdapter to grant the requested permission.
  void handleMediaAccessPermissionResponse(content::WebContents *, const QUrl &securityOrigin, WebContentsAdapterClient::MediaRequestFlags);

  void getDefaultDevices(const std::string &audioDeviceId, const std::string &videoDeviceId, bool audio, bool video, content::MediaStreamDevices *);

  // Overridden from content::MediaObserver:
  virtual void OnAudioCaptureDevicesChanged() Q_DECL_OVERRIDE { }
  virtual void OnVideoCaptureDevicesChanged() Q_DECL_OVERRIDE { }
  virtual void OnMediaRequestStateChanged(int render_process_id, int render_frame_id, int page_request_id, const GURL& security_origin, content::MediaStreamType stream_type, content::MediaRequestState state) Q_DECL_OVERRIDE;

  virtual void OnCreatingAudioStream(int /*render_process_id*/, int /*render_frame_id*/) Q_DECL_OVERRIDE { }

  DesktopStreamsRegistry *getDesktopStreamsRegistry();

 private:
  friend struct base::DefaultSingletonTraits<MediaCaptureDevicesDispatcher>;

  struct PendingAccessRequest {
    PendingAccessRequest(const content::MediaStreamRequest &request,
                         const content::MediaResponseCallback &callback);
    ~PendingAccessRequest();

    content::MediaStreamRequest request;
    content::MediaResponseCallback callback;
  };
  typedef std::deque<PendingAccessRequest> RequestsQueue;
  typedef std::map<content::WebContents *, RequestsQueue> RequestsQueues;

  MediaCaptureDevicesDispatcher();
  virtual ~MediaCaptureDevicesDispatcher();

  // content::NotificationObserver implementation.
  virtual void Observe(int type, const content::NotificationSource &source, const content::NotificationDetails &details) Q_DECL_OVERRIDE;

  // Helpers for ProcessMediaAccessRequest().
  void processDesktopCaptureAccessRequest(content::WebContents *, const content::MediaStreamRequest &, const content::MediaResponseCallback &);
  void processScreenCaptureAccessRequest(content::WebContents *,const content::MediaStreamRequest &, const content::MediaResponseCallback &);
  void handleScreenCaptureAccessRequest(content::WebContents *, bool userAccepted, const base::string16 &/*unused callback_input*/);
  void enqueueMediaAccessRequest(content::WebContents *, const content::MediaStreamRequest &, const content::MediaResponseCallback &);
  void ProcessQueuedAccessRequest(content::WebContents *);

  // Called by the MediaObserver() functions, executed on UI thread.
  void updateMediaRequestStateOnUIThread(int render_process_id, int render_frame_id, int page_request_id, const GURL& security_origin, content::MediaStreamType stream_type, content::MediaRequestState state);

  RequestsQueues m_pendingRequests;

  scoped_ptr<DesktopStreamsRegistry> m_desktopStreamsRegistry;

  content::NotificationRegistrar m_notificationsRegistrar;

  // Tracks MEDIA_DESKTOP_VIDEO_CAPTURE sessions which reach the
  // MEDIA_REQUEST_STATE_DONE state.  Sessions are remove when
  // MEDIA_REQUEST_STATE_CLOSING is encountered.
  struct DesktopCaptureSession {
    int render_process_id;
    int render_view_id;
    int page_request_id;
  };
  typedef std::list<DesktopCaptureSession> DesktopCaptureSessions;
  DesktopCaptureSessions m_desktopCaptureSessions;

  DISALLOW_COPY_AND_ASSIGN(MediaCaptureDevicesDispatcher);
};

} // namespace QtWebEngineCore

#endif  // MEDIA_CAPTURE_DEVICES_DISPATCHER_H