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// Copyright 2013 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_SEARCH_HOTWORD_SERVICE_H_
#define CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_H_
#include "base/basictypes.h"
#include "base/prefs/pref_change_registrar.h"
#include "components/keyed_service/core/keyed_service.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
class ExtensionService;
class HotwordClient;
class Profile;
namespace hotword_internal {
// Constants for the hotword field trial.
extern const char kHotwordFieldTrialName[];
extern const char kHotwordFieldTrialDisabledGroupName[];
} // namespace hotword_internal
// Provides an interface for the Hotword component that does voice triggered
// search.
class HotwordService : public content::NotificationObserver,
public KeyedService {
public:
// Returns true if the hotword supports the current system language.
static bool DoesHotwordSupportLanguage(Profile* profile);
explicit HotwordService(Profile* profile);
virtual ~HotwordService();
// Overridden from content::NotificationObserver:
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
bool ShouldShowOptInPopup();
// Used in testing to ensure that the popup is not shown more than this
// maximum number of times.
int MaxNumberTimesToShowOptInPopup();
// In addition to showing the popup, the preferences
// kHotwordOptInPopupTimesShown is also incremented.
void ShowOptInPopup();
// Checks for whether all the necessary files have downloaded to allow for
// using the extension.
virtual bool IsServiceAvailable();
// Determine if hotwording is allowed in this profile based on field trials
// and language.
virtual bool IsHotwordAllowed();
// Checks if the user has opted into audio logging. Returns true if the user
// is opted in, false otherwise..
bool IsOptedIntoAudioLogging();
// Used in the case of an error with the current hotword extension. Tries
// to reload the extension or in the case of failure, tries to re-download it.
// Returns true upon successful attempt at reload or if the extension has
// already loaded successfully by some other means.
virtual bool RetryHotwordExtension();
// Control the state of the hotword extension.
void EnableHotwordExtension(ExtensionService* extension_service);
void DisableHotwordExtension(ExtensionService* extension_service);
// Handles enabling/disabling the hotword extension when the user
// turns it off via the settings menu.
void OnHotwordSearchEnabledChanged(const std::string& pref_name);
// Called to handle the hotword session from |client|.
void RequestHotwordSession(HotwordClient* client);
void StopHotwordSession(HotwordClient* client);
HotwordClient* client() { return client_; }
private:
Profile* profile_;
PrefChangeRegistrar pref_registrar_;
content::NotificationRegistrar registrar_;
HotwordClient* client_;
DISALLOW_COPY_AND_ASSIGN(HotwordService);
};
#endif // CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_H_
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