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#ifndef MOZC_WIN32_BASE_OMAHA_UTIL_H_
#define MOZC_WIN32_BASE_OMAHA_UTIL_H_

// Omaha is the code name of Google Update, which is not used in
// OSS version of Mozc.
#if !defined(GOOGLE_JAPANESE_INPUT_BUILD)
#error OmahaUtil must be used with Google Japanese Input, not OSS Mozc
#endif  // !GOOGLE_JAPANESE_INPUT_BUILD

#include <windows.h>
#include <string>

#include "base/port.h"

namespace mozc {
namespace win32 {
// TODO(yukawa): Add unit test for this class.
class OmahaUtil {
 public:
  // Writes the channel name specified by |value| for Omaha.
  // Returns true if the operation completed successfully.
  static bool WriteChannel(const wstring &value);

  // Reads the channel name for Omaha.
  // Returns an empty string if there is no entry or fails to retrieve the
  // channel name.
  static wstring ReadChannel();

  // Clears the registry entry to specify error message for Omaha.
  // Returns true if the operation completed successfully.
  static bool ClearOmahaError();

  // Writes the registry entry for Omaha to show some error messages.
  // Returns true if the operation completed successfully.
  static bool WriteOmahaError(const wstring &ui_message, const wstring &header);

  // Clears the registry entry for the channel name.
  // Returns true if the operation completed successfully.
  static bool ClearChannel();

 private:
  DISALLOW_COPY_AND_ASSIGN(OmahaUtil);
};
}  // namespace win32
}  // namespace mozc
#endif  // MOZC_WIN32_BASE_OMAHA_UTIL_H_