// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_MEDIA_MEDIA_STREAM_DEVICES_CONTROLLER_H_
#define CHROME_BROWSER_MEDIA_MEDIA_STREAM_DEVICES_CONTROLLER_H_

#include <string>

#include "content/public/browser/web_contents_delegate.h"

class Profile;
class TabSpecificContentSettings;

namespace content {
class WebContents;
}

namespace user_prefs {
class PrefRegistrySyncable;
}

class MediaStreamDevicesController {
 public:
  MediaStreamDevicesController(content::WebContents* web_contents,
                               const content::MediaStreamRequest& request,
                               const content::MediaResponseCallback& callback);

  virtual ~MediaStreamDevicesController();

  // TODO(tommi): Clean up all the policy code and integrate with
  // HostContentSettingsMap instead.  This will make creating the UI simpler
  // and the code cleaner.  crbug.com/244389.

  // Registers the prefs backing the audio and video policies.
  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);

  // Public method to be called before creating the MediaStreamInfoBarDelegate.
  // This function will check the content settings exceptions and take the
  // corresponding action on exception which matches the request.
  bool DismissInfoBarAndTakeActionOnSettings();

  // Public methods to be called by MediaStreamInfoBarDelegate;
  bool has_audio() const { return microphone_requested_; }
  bool has_video() const { return webcam_requested_; }
  const std::string& GetSecurityOriginSpec() const;
  void Accept(bool update_content_setting);
  void Deny(bool update_content_setting);

 private:
  enum DevicePolicy {
    POLICY_NOT_SET,
    ALWAYS_DENY,
    ALWAYS_ALLOW,
  };

  // Called by GetAudioDevicePolicy and GetVideoDevicePolicy to check
  // the currently set capture device policy.
  DevicePolicy GetDevicePolicy(const char* policy_name,
                               const char* whitelist_policy_name) const;

  // Returns true if the origin of the request has been granted the media
  // access before, otherwise returns false.
  bool IsRequestAllowedByDefault() const;

  // Returns true if the media access for the origin of the request has been
  // blocked before. Otherwise returns false.
  bool IsRequestBlockedByDefault() const;

  // Returns true if the media section in content settings is set to
  // |CONTENT_SETTING_BLOCK|, otherwise returns false.
  bool IsDefaultMediaAccessBlocked() const;

  // Returns true if the origin is a secure scheme, otherwise returns false.
  bool IsSchemeSecure() const;

  // Returns true if request's origin is from internal objects like
  // chrome://URLs, otherwise returns false.
  bool ShouldAlwaysAllowOrigin() const;

  // Sets the permission of the origin of the request. This is triggered when
  // the users deny the request or allow the request for https sites.
  void SetPermission(bool allowed) const;

  // Notifies the content setting UI that the media stream access request or
  // part of the request is accepted.
  void NotifyUIRequestAccepted() const;

  // Notifies the content setting UI that the media stream access request or
  // part of the request is denied.
  void NotifyUIRequestDenied() const;

  content::WebContents* web_contents_;

  // The owner of this class needs to make sure it does not outlive the profile.
  Profile* profile_;

  // Weak pointer to the tab specific content settings of the tab for which the
  // MediaStreamDevicesController was created. The tab specific content
  // settings are associated with a the web contents of the tab. The
  // MediaStreamDeviceController must not outlive the web contents for which it
  // was created.
  TabSpecificContentSettings* content_settings_;

  // The original request for access to devices.
  const content::MediaStreamRequest request_;

  // The callback that needs to be Run to notify WebRTC of whether access to
  // audio/video devices was granted or not.
  content::MediaResponseCallback callback_;

  bool microphone_requested_;
  bool webcam_requested_;

  DISALLOW_COPY_AND_ASSIGN(MediaStreamDevicesController);
};

#endif  // CHROME_BROWSER_MEDIA_MEDIA_STREAM_DEVICES_CONTROLLER_H_