// 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_BOOKMARKS_ENHANCED_BOOKMARKS_FEATURES_H_
#define CHROME_BROWSER_BOOKMARKS_ENHANCED_BOOKMARKS_FEATURES_H_

#include <string>

#include "build/build_config.h"

namespace about_flags {
class FlagsStorage;
}  // namespace about_flags

class PrefService;
class Profile;

// States for bookmark experiment. They are set by Chrome sync into
// sync_driver::prefs::kEnhancedBookmarksExperimentEnabled user preference and
// used for UMA reporting as well.
enum BookmarksExperimentState {
  BOOKMARKS_EXPERIMENT_NONE,
  BOOKMARKS_EXPERIMENT_ENABLED,
  BOOKMARKS_EXPERIMENT_ENABLED_USER_OPT_OUT,
  BOOKMARKS_EXPERIMENT_ENABLED_FROM_FINCH,
  BOOKMARKS_EXPERIMENT_OPT_OUT_FROM_FINCH,
  BOOKMARKS_EXPERIMENT_ENABLED_FROM_FINCH_USER_SIGNEDIN,
  BOOKMARKS_EXPERIMENT_ENABLED_FROM_SYNC_UNKNOWN,
  BOOKMARKS_EXPERIMENT_ENUM_SIZE
};

// Returns true and sets |extension_id| if bookmarks experiment enabled
//         false if no bookmark experiment or extension id is empty.
bool GetBookmarksExperimentExtensionID(const PrefService* user_prefs,
                                       std::string* extension_id);

// Updates bookmark experiment state based on information from Chrome sync,
// Finch experiments, and command line flag.
void UpdateBookmarksExperimentState(
    PrefService* user_prefs,
    PrefService* local_state,
    bool user_signed_in,
    BookmarksExperimentState experiment_enabled_from_sync);

// Same as UpdateBookmarksExperimentState, but the last argument with
// BOOKMARKS_EXPERIMENT_ENABLED_FROM_SYNC_UNKNOWN.
// Intended for performing initial configuration of bookmarks experiments
// when the browser is first initialized.
void InitBookmarksExperimentState(Profile* profile);

// Sets flag to opt-in user into Finch experiment.
void ForceFinchBookmarkExperimentIfNeeded(
    PrefService* local_state,
    BookmarksExperimentState bookmarks_experiment_state);

// Returns true if enhanced bookmarks experiment is running.
// Experiment could run by Chrome sync or by Finch.
// Note that this doesn't necessarily mean that enhanced bookmarks
// is enabled, e.g., user can opt out using a flag.
bool IsEnhancedBookmarksExperimentEnabled(
    about_flags::FlagsStorage* flags_storage);

#if defined(OS_ANDROID)
// Returns true if enhanced bookmark salient image prefetching is enabled.
// This can be controlled by field trial.
bool IsEnhancedBookmarkImageFetchingEnabled(const PrefService* user_prefs);

// Returns true if enhanced bookmarks is enabled.
bool IsEnhancedBookmarksEnabled(const PrefService* user_prefs);

#endif

// Returns true when flag enable-dom-distiller is set or enabled from Finch.
bool IsEnableDomDistillerSet();

// Returns true when flag enable-sync-articles is set or enabled from Finch.
bool IsEnableSyncArticlesSet();

#endif  // CHROME_BROWSER_BOOKMARKS_ENHANCED_BOOKMARKS_FEATURES_H_