// Copyright (c) 2011 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_CHROMEOS_SYSTEM_ACCESS_H_
#define CHROME_BROWSER_CHROMEOS_SYSTEM_ACCESS_H_
#pragma once

#include <string>

#include "unicode/timezone.h"

namespace chromeos {

// This interface provides access to Chrome OS system APIs such as the
// timezone setting.
class SystemAccess {
 public:
  class Observer {
   public:
    // Called when the timezone has changed. |timezone| is non-null.
    virtual void TimezoneChanged(const icu::TimeZone& timezone) = 0;
  };

  static SystemAccess* GetInstance();

  // Returns the current timezone as an icu::Timezone object.
  virtual const icu::TimeZone& GetTimezone() = 0;

  // Sets the current timezone. |timezone| must be non-null.
  virtual void SetTimezone(const icu::TimeZone& timezone) = 0;

  // Retrieve the named machine statistic (e.g. "hardware_class").
  // This does not update the statistcs. If the |name| is not set, |result|
  // preserves old value.
  virtual bool GetMachineStatistic(const std::string& name,
                                   std::string* result) = 0;

  virtual void AddObserver(Observer* observer) = 0;
  virtual void RemoveObserver(Observer* observer) = 0;

 protected:
  virtual ~SystemAccess() {}
};

}  // namespace chromeos

#endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_ACCESS_H_