// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_CHROMEOS_REPORTING_USER_REPORTING_SETTINGS_H_
#define CHROME_BROWSER_CHROMEOS_REPORTING_USER_REPORTING_SETTINGS_H_

#include <map>
#include <memory>

#include "base/callback_list.h"
#include "base/functional/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observation.h"
#include "base/sequence_checker.h"
#include "base/thread_annotations.h"
#include "base/values.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_observer.h"
#include "components/prefs/pref_change_registrar.h"
#include "components/reporting/metrics/reporting_settings.h"

namespace reporting {

// `UserReportingSettings` is used to fetch user reporting settings via the pref
// store. Extends a convenient common interface that metric reporting components
// use to access reporting settings and subscribe to reporting setting updates.
// Needs to be accessed from the main thread given its dependency on user
// profiles and the user pref store.
class UserReportingSettings : public ReportingSettings, public ProfileObserver {
 public:
  explicit UserReportingSettings(base::WeakPtr<Profile> profile);
  UserReportingSettings(const UserReportingSettings& other) = delete;
  UserReportingSettings& operator=(const UserReportingSettings& other) = delete;
  ~UserReportingSettings() override;

  // ReportingSettings:
  base::CallbackListSubscription AddSettingsObserver(
      const std::string& path,
      base::RepeatingClosure callback) override;
  bool PrepareTrustedValues(base::OnceClosure callback) override;
  bool GetBoolean(const std::string& path, bool* out_value) const override;
  bool GetInteger(const std::string& path, int* out_value) const override;
  bool GetList(const std::string& path,
               const base::ListValue** out_value) const override;

  // Only bool and List are allowed, otherwise will return false.
  bool GetReportingEnabled(const std::string& path,
                           bool* out_value) const override;

  // Returns whether the specified setting is being observed for testing
  // purposes.
  bool IsObservingSettingsForTest(const std::string& path);

 private:
  // ProfileObserver:
  void OnProfileWillBeDestroyed(Profile* profile) override;

  // Internal callback triggered when the setting value is updated.
  void OnPrefChanged(const std::string& path);

  SEQUENCE_CHECKER(sequence_checker_);

  const base::WeakPtr<Profile> profile_;
  std::unique_ptr<PrefChangeRegistrar> pref_change_registrar_;

  // A map of setting names to a list of observers. Observers are triggered in
  // the order they are added.
  std::map<std::string, std::unique_ptr<base::RepeatingClosureList>>
      settings_observers_ GUARDED_BY_CONTEXT(sequence_checker_);

  // Observer that is used to track profile lifecycle so we can perform
  // cleanup tasks on destruction.
  base::ScopedObservation<Profile, ProfileObserver> scoped_profile_observer_
      GUARDED_BY_CONTEXT(sequence_checker_){this};

  base::WeakPtrFactory<UserReportingSettings> weak_ptr_factory_{this};
};

}  // namespace reporting

#endif  // CHROME_BROWSER_CHROMEOS_REPORTING_USER_REPORTING_SETTINGS_H_